Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)

Paleomagnetic and rock magnetic investigation was performed on the 35-m long MD03-2595 CADO (Coring Adélie Diatom Oozes) piston core recovered on the continental rise of the Wilkes Land Basin (East Antarctica). Analysis of the characteristic remanent magnetization (ChRM) inclination record indicates...

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Published in:	Physics of the Earth and Planetary Interiors
Main Authors:	Macrì, P., Sagnotti, L., Dinarès-Turell, J., Caburlotto, A.
Other Authors:	Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Caburlotto, A.; Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy
Format:	Article in Journal/Newspaper
Language:	English
Published:	Elsevier B.V. 2010
Subjects:	Paleomagnetism Relative paleointensity Brunhes Chron Matuyama–Brunhes precursor Antarctica 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism Antarctic East Antarctic Ice Sheet East Antarctica Wilkes Land Antarc* Ice Sheet
Online Access:	http://hdl.handle.net/2122/5942 https://doi.org/10.1016/j.pepi.2009.12.002

id	ftingv:oai:www.earth-prints.org:2122/5942
record_format	openpolar
institution	Open Polar
collection	Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
op_collection_id	ftingv
language	English
topic	Paleomagnetism Relative paleointensity Brunhes Chron Matuyama–Brunhes precursor Antarctica 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism
spellingShingle	Paleomagnetism Relative paleointensity Brunhes Chron Matuyama–Brunhes precursor Antarctica 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism Macrì, P. Sagnotti, L. Dinarès-Turell, J. Caburlotto, A. Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)
topic_facet	Paleomagnetism Relative paleointensity Brunhes Chron Matuyama–Brunhes precursor Antarctica 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism
description	Paleomagnetic and rock magnetic investigation was performed on the 35-m long MD03-2595 CADO (Coring Adélie Diatom Oozes) piston core recovered on the continental rise of the Wilkes Land Basin (East Antarctica). Analysis of the characteristic remanent magnetization (ChRM) inclination record indicates a normal magnetic polarity for the uppermost 34m of the sequence and a distinctive abrupt polarity change at the bottom of the core. This polarity change, which spans a 27 cm thick stratigraphic interval, represents a detailed record of the Matuyama–Brunhes (M–B) transition and it is preceded by a sharp oscillation in paleomagnetic directions that may correlate to the M–B precursor event. Paleomagnetic measurements enable reconstruction of geomagnetic relative paleointensity (RPI) variations, and a highresolution age model was established by correlating the CADO RPI curve to the available global reference RPI stack, indicating that the studied sequence reaches back to ca. 800 ka with an average sedimentation rate of 4.4 cm/ka. Orbital periodicities (100 ka and 41 ka) were found in the ChRM inclination record, and a significant coherence of ChRM inclination and RPI record around 100 ka suggests that long-term geomagnetic secular variation in inclination is controlled by changes in the relative strength of the geocentric axial dipole and persistent non-dipole components. Moreover, even if the relatively homogeneous rock magnetic parameters and lithofacies throughout the recovered sequence indicates a substantial stability of the East Antarctic Ice Sheet during the middle and late Pleistocene, influence of the 100 ka and 41 ka orbital periodicities has been detected in some rock magnetic parameters, indicating subtle variations in the concentration and grain-size of the magnetic minerals linked to orbital forcing of the global climate. Published 72-86 2.2. Laboratorio di paleomagnetismo JCR Journal reserved
author2	Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Caburlotto, A.; Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy
format	Article in Journal/Newspaper
author	Macrì, P. Sagnotti, L. Dinarès-Turell, J. Caburlotto, A.
author_facet	Macrì, P. Sagnotti, L. Dinarès-Turell, J. Caburlotto, A.
author_sort	Macrì, P.
title	Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)
title_short	Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)
title_full	Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)
title_fullStr	Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)
title_full_unstemmed	Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)
title_sort	relative geomagnetic paleointensity of the brunhes chron and the matuyama–brunhes precursor as recorded in sediment core from wilkes land basin (antarctica)
publisher	Elsevier B.V.
publishDate	2010
url	http://hdl.handle.net/2122/5942 https://doi.org/10.1016/j.pepi.2009.12.002
long_lat	ENVELOPE(120.000,120.000,-69.000,-69.000)
geographic	Antarctic East Antarctic Ice Sheet East Antarctica Wilkes Land
geographic_facet	Antarctic East Antarctic Ice Sheet East Antarctica Wilkes Land
genre	Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land
genre_facet	Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land
op_relation	Physics of the Earth and Planetary Interiors /179 (2010) http://hdl.handle.net/2122/5555 Arason, P., Levi, S., 1990. Compaction and inclination shallowing in deep-sea sediments from the Pacific Ocean. J. Geophys. Res. 95, 4501–4510. Aurnou, J.M., Andreadis, S., Zhu, L., Olson, P.L., 2003. Experiments on convection in Earth’s core tangent cylinder. Earth Planet. Sci. Lett. 212, 119–134. Brachfeld, S.A., Acton, G.D., Guyodo, Y., Banerjee, S.K., 2000. High-resolution paleomagnetic records from Holocene sediments from the Palmer Deep, western Antarctic Peninsula. Earth Planet. Sci. Lett. 181, 421–441. Brachfeld, S.A., Domack, E.W., Kissel, C., Laj, C., Leventer, A., Ishman, S.E., Gilbert, R., Camerlenghi, A., Eglinton, L.B., 2003. Holocene history of the Larsen Ice shelf constrained by geomagnetic paleointensity dating. Geology 31, 749–752. Brancolini, G., Harris, P.T., 2000. Post Cruise Report AGSO Survey 217: Joint Italian/ Australian Marine Geoscienze Expedition Aboard the R.V. Tangaroa to the Geotge Vth Land Region of East Antartica during February–March, 2000. Australian National Antarctic Research Expeditions Project No. 1044, Wilkes Land Glacial History (WEGA), AGSO Record. Brown, L.L., Singer, B.S., Pickens, J.C., Jicha, B.R., 2004. Paleomagnetic directions and 40Ar//39Ar ages from the Tatara-San Pedro volcanic complex, Chilean Andes: Lava record of a Matuyama–Brunhes precursor? J. Geophys. Res. 109, B12101, doi:10.1029/2004JB003007. Busetti, M., Caburlotto, A., Armand, L., Damiani, D., Giorgetti, G., Lucchi, R.G., Quilty, P.G., Villa, G., 2003. Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results. Deep-Sea Res. II 50, 1529–1562. Caburlotto, A., Macrì, P., Damiani, D., Giorgetti, G., Busetti, M., Villa, G., Lucchi, R.G., 2003. Piston cores from the Wilkes Land Rise: data and considerations. Terra Antartica Rep. 9, 63–68. Channell, J.E.T., Curtis, J.H., Flower, B.P., 2004. The Matuyama–Brunhes boundary interval (500–900 ka) in North Atlantic drift sediments. Geophys. J. Int. 158, 489–505. Channell, J.E.T., 2006. Late Brunhes polarity excursions (Mono Lake, Iceland Basin and Pringle Falls) recorded at ODP Site 919 (Irminger Basin). Earth Planet. Sci. Lett. 244, 378–393. Channell, J.E.T., Xuan, C., Hodell, D.A., 2009. Stacking paleointensity and oxygen isotope data for the last 1.5 Myr (PISO-1500). Earth Planet. Sci. Lett. 283, 14–23. Clement, B.M., 2004. Dependence of the duration of geomagnetic polarity reversals on site latitude. Nature 428, 637–640. Coe, R.S., Singer, B.S., Pringle, M.S., Zhao, X., 2004. Matuyama–Brunhes reversal and Kamikatsura event on Maui: paleomagnetic directions, 40Ar/39Ar ages and implications. Earth Planet. Sci. Lett. 222, 667–684. Day, R., Fuller, M., Schmidt, V.A., 1977. Hysteresis properties of titanomagnetites. Grain-size and compositional dependence. Phys. Earth Planet. Int. 13, 260–267. Deamer, G.A., Kodama, K.P., 1990. Compaction-induced inclination shallowing in synthetic and natural clay-rich sediments. J. Geophys. Res. 95 (B4), 4511–4529. deMenocal, P.B., Ruddiman, W.F., Kent, D.V., 1990. Depth of post-depositional remanence acquisition in deep-sea sediments: a case study of the Brunhes–Matuyama reversal and oxygen isotopic Stage 19.1. Earth Planet. Sci. Lett. 99, 1–13. Dinarès-Turell, J., Sagnotti, L., Roberts, A.P., 2002. Relative geomagnetic paleointensity from the Jaramillo Subchron to the Matuyama/Brunhes boundary as recorded in a Mediterranean piston core. Earth Planet. Sci. Lett. 194, 327–341. Escutia, C., Eittreim, S.L., Cooper, A.K., 1997. Cenozoic sedimentation on the Wilkes Land Continental Rise, Antarctica. In: Ricci, C.A. (Ed.), Proceedings of the VII International Symposium on Antarctic Earth Sciences. Terra Antarctica Publication, Siena, pp. 791–795. Fisher, R.A., 1953. Dispersion on a sphere. Proc. R. Soc. Lond. 217, 295–305. Glatzmaier, G.A., Roberts, P.H., 1995a. A three-dimensional convective dynamo solution with rotating and finitely conducting inner core and mantle. Phys. Earth Planet. Int. 91, 63–75. Glatzmaier, G.A., Roberts, P.H., 1995b.Athree-dimensional self-consistent computer simulation of a geomagnetic field reversal. Nature 377, 203–209. Guillou, H., Singer, B., Laj, C., Kissel, C., Scaillet, S., Jicha, B.R., 2004. On the age of the Laschamp geomagnetic excursion. Earth Planet. Sci. Lett. 227, 331–343. Guyodo, Y., Valet, J.-P., 1999. Global changes in geomagnetic intensity during the past 800 thousand years. Nature 399, 249–252. Guyodo, Y., Acton, G.D., Brachfeld, S., Channell, J.E.T., 2001. A sedimentary paleomagnetic record of the Matuyama Chron from the Western Antarctic Margin (ODP Site 1101). Earth Planet. Sci. Lett. 191, 61–74. Guyodo, Y., Channell, J.E.T., Thomas Ray, G., 2002. Deconvolution of u-channel paleomagnetic data near geomagnetic reversals and short events. Geophys. Res. Lett. 29, 1845, doi:10.1029/2002GL014927. Hartl, P., Tauxe, L., 1996. A precursor to the Matuyama/Brunhes transition-field instability as recorded in pelagic sediments. Earth Planet. Sci. Lett. 138, 121–135. Hyodo, M., Biswas, D.K., Noda, T., Tomioka, N., Mishima, T., Itota, C., Sato, H., 2006. Millennial- to submillennial-scale features of the Matuyama–Brunhes geomagnetic polarity transition from Osaka Bay, southwestern Japan. J. Geophys. Res. 111, B02103, doi:10.1029/2004JB003584. Kent, D.V., Schneider, D.A., 1995. Correlation of paleointensity variation records in the Brunhes/Matuyama polarity transition interval. Earth Planet. Sci. Lett. 129, 135–144. King, J.W., Banerjee, S.K., Marvin, J., 1983.Anewrock-magnetic approach to selecting sediments for geomagnetic paleointensity for the last 4000 years. J. Geophys. Res. 88 (B7), 5911–5921. Kirschvink, J.L., 1980. The least-squares line and plane and the analysis of paleomagnetic data. Geophys. J. Roy. Astron. Soc. 62, 699–718. Kuang, W., Bloxham, J., 1997. An Earth-like numerical dynamo model. Nature 389, 371–374. Langereis, C.G., Dekkers, M.J., de Lange, G.J., Paterne, M.E., van Santvoort, P.J.M., 1997. Magnetostratigraphy and astronomical calibration of the last 1.1 Myr from an eastern Mediterranean piston core and dating of short events in the Brunhes. Geophys. J. Int. 129, 75–94. Lawrence, K.P., Tauxe, L., Staudigel, H., Constable, C.G., Koppers, A., McIntosh, W., Johnson, C.L., 2009. Paleomagnetic field properties at high southern latitude. Geochem. Geophys. Geosyst. 10, Q01005, doi:10.1029/2008GC002072. Lund, S.P., Keigwin, L., 1994. Measurement of the degree of smoothing in sediment paleomagnetic secular variation records: an example from Late Quaternary deep-sea sediments of the Bermuda Rise, western North Atlantic Ocean. Earth Planet. Sci. Lett. 122, 317–330. Lund, S.P., Acton, G., Clement, B., Hastedt, M., Okada, M.,Williams, R., 1998. Geomagnetic field excursions occurred often during the last million years. EOS, Trans. Am. Geophys. Un. 79, 178–179. Macrì, P., Sagnotti, L., Dinares-Turell, J., Caburlotto, A., 2005. A composite record of Late Pleistocene relative geomagnetic paleointensity from the Wilkes Land Basin (Antarctica). Phys. Earth Planet. Int. 151, 223–242. Macrì, P., Sagnotti, L., Lucchi, R.G., 2006. A stacked record of relative geomagnetic paleointensity for the past 270 kyr from the western continental rise of the Antarctic Peninsula. Earth Planet. Sci. Lett. 252, 162–179. Meynadier, L., Valet, J.-P., Weeks, R., Shackleton, N.J., Hagee, V.L., 1992. Relative geomagnetic intensity of the field during the last 140 ka. Earth Planet. Sci. Lett. 114, 39–57. Mitra, R., Tauxe, L., 2009. Full vector model for magnetization in sediments. Earth Planet. Sci. Lett. 286, 535–545. Nowaczyk, N.R., Antonow, M., 1997. High resolution magnetostratigraphy of four sediment cores from the Greenland Sea. I. Identification of the Mono Lake excursion, Laschamp and Biwa I/Jamaica geomagnetic polarity events. Geophys. J. Int. 131, 310–324. Nowaczyk, N., Frederichs, T., 1999. Geomagnetic events and relative paleointensity variations during the last 300 ka as recorded in Kolbeinsey Ridge sediments, Iceland Sea, indication for a strongly variable geomagnetic field. Int. J. Earth Sci. 88, 116–131. Oda, H., Shibuya, H., 1996. Deconvolution of long-core paleomagnetic data of Ocean Drilling Program by Akaike’s Bayesian Information Criterion minimization. J. Geophys. Res. 101, 2815–2834. Paillard, D., Labeyrie, L., Yiou, P., 1996. Macintosh program performs time-series analysis. Eos, Trans. Am. Geophys. Un. 77, 397. Quidelleur, X., Carlut, J., Soler, V., Valet, J.-P., Gillot, P.-Y., 2003. The age and duration of the Matuyama–Brunhes transition from new K-Ar data from La Palma (Canary Islands) and revisited 40Ar/39Ar ages. Earth Planet. Sci. Lett. 208, 149–163. Rebesco, M., Larter, R.D., Barker, P.F., Camerlenghi, A., Vanneste, L.E., 1997. The history of sedimentation on the continental rise west of the Antarctic Peninsula. In: Cooper, A.K., Barker, P.F. (Eds.), Geology and Seismic Stratigraphy of the Antarctic Margin. Part 2. Antarctic Research Series 71, American Geophysical Union, Washington, DC, pp. 29–49. Roberts, A.P., Winklhofer, M., 2004. Why are geomagnetic excursions not always recorded in sediments? Constraints from post-depositional remanent magnetization lock-in modelling. Earth Planet. Sci. Lett. 227, 345–359. Roberts, A.P., 2006. High-resolution magnetic analysis of sediment cores: strengths, limitations and strategies for maximizing the value of long-core magnetic data. Phys. Earth Planet. Int. 156, 162–178. Roberts, A.P., 2008. Geomagnetic excursions: knowns and unknowns. Geophys. Res. Lett. 35, L17307, doi:10.1029/2008GL034719. Sagnotti, L., Macrì, P., Camerlenghi, A., Rebesco, M., 2001. Environmental magnetism of late Pleistocene sediments from the pacific margin of the Antarctic Peninsula and interhemispheric correlation of climatic events. Earth Planet. Sci. Lett. 192, 65–80. Sagnotti, L., Rochette, P., Jackson, M., Vadeboin, F., Dinarès-Turell, J., Winkler, A., “Mag-Net” Science Team, 2003. Inter-laboratory calibration of low field magArason, P., Levi, S., 1990. Compaction and inclination shallowing in deep-sea sediments from the Pacific Ocean. J. Geophys. Res. 95, 4501–4510. Aurnou, J.M., Andreadis, S., Zhu, L., Olson, P.L., 2003. Experiments on convection in Earth’s core tangent cylinder. Earth Planet. Sci. Lett. 212, 119–134. Brachfeld, S.A., Acton, G.D., Guyodo, Y., Banerjee, S.K., 2000. High-resolution paleomagnetic records from Holocene sediments from the Palmer Deep, western Antarctic Peninsula. Earth Planet. Sci. Lett. 181, 421–441. Brachfeld, S.A., Domack, E.W., Kissel, C., Laj, C., Leventer, A., Ishman, S.E., Gilbert, R., Camerlenghi, A., Eglinton, L.B., 2003. Holocene history of the Larsen Ice shelf constrained by geomagnetic paleointensity dating. Geology 31, 749–752. Brancolini, G., Harris, P.T., 2000. Post Cruise Report AGSO Survey 217: Joint Italian/ Australian Marine Geoscienze Expedition Aboard the R.V. Tangaroa to the Geotge Vth Land Region of East Antartica during February–March, 2000. Australian National Antarctic Research Expeditions Project No. 1044, Wilkes Land Glacial History (WEGA), AGSO Record. Brown, L.L., Singer, B.S., Pickens, J.C., Jicha, B.R., 2004. Paleomagnetic directions and 40Ar//39Ar ages from the Tatara-San Pedro volcanic complex, Chilean Andes: Lava record of a Matuyama–Brunhes precursor? J. Geophys. Res. 109, B12101, doi:10.1029/2004JB003007. Busetti, M., Caburlotto, A., Armand, L., Damiani, D., Giorgetti, G., Lucchi, R.G., Quilty, P.G., Villa, G., 2003. Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results. Deep-Sea Res. II 50, 1529–1562. Caburlotto, A., Macrì, P., Damiani, D., Giorgetti, G., Busetti, M., Villa, G., Lucchi, R.G., 2003. Piston cores from the Wilkes Land Rise: data and considerations. Terra Antartica Rep. 9, 63–68. Channell, J.E.T., Curtis, J.H., Flower, B.P., 2004. The Matuyama–Brunhes boundary interval (500–900 ka) in North Atlantic drift sediments. Geophys. J. Int. 158, 489–505. Channell, J.E.T., 2006. Late Brunhes polarity excursions (Mono Lake, Iceland Basin and Pringle Falls) recorded at ODP Site 919 (Irminger Basin). Earth Planet. Sci. Lett. 244, 378–393. Channell, J.E.T., Xuan, C., Hodell, D.A., 2009. Stacking paleointensity and oxygen isotope data for the last 1.5 Myr (PISO-1500). Earth Planet. Sci. Lett. 283, 14–23. Clement, B.M., 2004. Dependence of the duration of geomagnetic polarity reversals on site latitude. Nature 428, 637–640. Coe, R.S., Singer, B.S., Pringle, M.S., Zhao, X., 2004. Matuyama–Brunhes reversal and Kamikatsura event on Maui: paleomagnetic directions, 40Ar/39Ar ages and implications. Earth Planet. Sci. Lett. 222, 667–684. Day, R., Fuller, M., Schmidt, V.A., 1977. Hysteresis properties of titanomagnetites. Grain-size and compositional dependence. Phys. Earth Planet. Int. 13, 260–267. Deamer, G.A., Kodama, K.P., 1990. Compaction-induced inclination shallowing in synthetic and natural clay-rich sediments. J. Geophys. Res. 95 (B4), 4511–4529. deMenocal, P.B., Ruddiman, W.F., Kent, D.V., 1990. Depth of post-depositional remanence acquisition in deep-sea sediments: a case study of the Brunhes–Matuyama reversal and oxygen isotopic Stage 19.1. Earth Planet. Sci. Lett. 99, 1–13. Dinarès-Turell, J., Sagnotti, L., Roberts, A.P., 2002. Relative geomagnetic paleointensity from the Jaramillo Subchron to the Matuyama/Brunhes boundary as recorded in a Mediterranean piston core. Earth Planet. Sci. Lett. 194, 327–341. Escutia, C., Eittreim, S.L., Cooper, A.K., 1997. Cenozoic sedimentation on the Wilkes Land Continental Rise, Antarctica. In: Ricci, C.A. (Ed.), Proceedings of the VII International Symposium on Antarctic Earth Sciences. Terra Antarctica Publication, Siena, pp. 791–795. Fisher, R.A., 1953. Dispersion on a sphere. Proc. R. Soc. Lond. 217, 295–305. Glatzmaier, G.A., Roberts, P.H., 1995a. A three-dimensional convective dynamo solution with rotating and finitely conducting inner core and mantle. Phys. Earth Planet. Int. 91, 63–75. Glatzmaier, G.A., Roberts, P.H., 1995b.Athree-dimensional self-consistent computer simulation of a geomagnetic field reversal. Nature 377, 203–209. Guillou, H., Singer, B., Laj, C., Kissel, C., Scaillet, S., Jicha, B.R., 2004. On the age of the Laschamp geomagnetic excursion. Earth Planet. Sci. Lett. 227, 331–343. Guyodo, Y., Valet, J.-P., 1999. Global changes in geomagnetic intensity during the past 800 thousand years. Nature 399, 249–252. Guyodo, Y., Acton, G.D., Brachfeld, S., Channell, J.E.T., 2001. A sedimentary paleomagnetic record of the Matuyama Chron from the Western Antarctic Margin (ODP Site 1101). Earth Planet. Sci. Lett. 191, 61–74. Guyodo, Y., Channell, J.E.T., Thomas Ray, G., 2002. Deconvolution of u-channel paleomagnetic data near geomagnetic reversals and short events. Geophys. Res. Lett. 29, 1845, doi:10.1029/2002GL014927. Hartl, P., Tauxe, L., 1996. A precursor to the Matuyama/Brunhes transition-field instability as recorded in pelagic sediments. Earth Planet. Sci. Lett. 138, 121–135. Hyodo, M., Biswas, D.K., Noda, T., Tomioka, N., Mishima, T., Itota, C., Sato, H., 2006. Millennial- to submillennial-scale features of the Matuyama–Brunhes geomagnetic polarity transition from Osaka Bay, southwestern Japan. J. Geophys. Res. 111, B02103, doi:10.1029/2004JB003584. Kent, D.V., Schneider, D.A., 1995. Correlation of paleointensity variation records in the Brunhes/Matuyama polarity transition interval. Earth Planet. Sci. Lett. 129, 135–144. King, J.W., Banerjee, S.K., Marvin, J., 1983.Anewrock-magnetic approach to selecting sediments for geomagnetic paleointensity for the last 4000 years. J. Geophys. Res. 88 (B7), 5911–5921. Kirschvink, J.L., 1980. The least-squares line and plane and the analysis of paleomagnetic data. Geophys. J. Roy. Astron. Soc. 62, 699–718. Kuang, W., Bloxham, J., 1997. An Earth-like numerical dynamo model. Nature 389, 371–374. Langereis, C.G., Dekkers, M.J., de Lange, G.J., Paterne, M.E., van Santvoort, P.J.M., 1997. Magnetostratigraphy and astronomical calibration of the last 1.1 Myr from an eastern Mediterranean piston core and dating of short events in the Brunhes. Geophys. J. Int. 129, 75–94. Lawrence, K.P., Tauxe, L., Staudigel, H., Constable, C.G., Koppers, A., McIntosh, W., Johnson, C.L., 2009. Paleomagnetic field properties at high southern latitude. Geochem. Geophys. Geosyst. 10, Q01005, doi:10.1029/2008GC002072. Lund, S.P., Keigwin, L., 1994. Measurement of the degree of smoothing in sediment paleomagnetic secular variation records: an example from Late Quaternary deep-sea sediments of the Bermuda Rise, western North Atlantic Ocean. Earth Planet. Sci. Lett. 122, 317–330. Lund, S.P., Acton, G., Clement, B., Hastedt, M., Okada, M.,Williams, R., 1998. Geomagnetic field excursions occurred often during the last million years. EOS, Trans. Am. Geophys. Un. 79, 178–179. Macrì, P., Sagnotti, L., Dinares-Turell, J., Caburlotto, A., 2005. A composite record of Late Pleistocene relative geomagnetic paleointensity from the Wilkes Land Basin (Antarctica). Phys. Earth Planet. Int. 151, 223–242. Macrì, P., Sagnotti, L., Lucchi, R.G., 2006. A stacked record of relative geomagnetic paleointensity for the past 270 kyr from the western continental rise of the Antarctic Peninsula. Earth Planet. Sci. Lett. 252, 162–179. Meynadier, L., Valet, J.-P., Weeks, R., Shackleton, N.J., Hagee, V.L., 1992. Relative geomagnetic intensity of the field during the last 140 ka. Earth Planet. Sci. Lett. 114, 39–57. Mitra, R., Tauxe, L., 2009. Full vector model for magnetization in sediments. Earth Planet. Sci. Lett. 286, 535–545. Nowaczyk, N.R., Antonow, M., 1997. High resolution magnetostratigraphy of four sediment cores from the Greenland Sea. I. Identification of the Mono Lake excursion, Laschamp and Biwa I/Jamaica geomagnetic polarity events. Geophys. J. Int. 131, 310–324. Nowaczyk, N., Frederichs, T., 1999. Geomagnetic events and relative paleointensity variations during the last 300 ka as recorded in Kolbeinsey Ridge sediments, Iceland Sea, indication for a strongly variable geomagnetic field. Int. J. Earth Sci. 88, 116–131. Oda, H., Shibuya, H., 1996. Deconvolution of long-core paleomagnetic data of Ocean Drilling Program by Akaike’s Bayesian Information Criterion minimization. J. Geophys. Res. 101, 2815–2834. Paillard, D., Labeyrie, L., Yiou, P., 1996. Macintosh program performs time-series analysis. Eos, Trans. Am. Geophys. Un. 77, 397. Quidelleur, X., Carlut, J., Soler, V., Valet, J.-P., Gillot, P.-Y., 2003. The age and duration of the Matuyama–Brunhes transition from new K-Ar data from La Palma (Canary Islands) and revisited 40Ar/39Ar ages. Earth Planet. Sci. Lett. 208, 149–163. Rebesco, M., Larter, R.D., Barker, P.F., Camerlenghi, A., Vanneste, L.E., 1997. The history of sedimentation on the continental rise west of the Antarctic Peninsula. In: Cooper, A.K., Barker, P.F. (Eds.), Geology and Seismic Stratigraphy of the Antarctic Margin. Part 2. Antarctic Research Series 71, American Geophysical Union, Washington, DC, pp. 29–49. Roberts, A.P., Winklhofer, M., 2004. 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spelling	ftingv:oai:www.earth-prints.org:2122/5942 2023-05-15T14:01:36+02:00 Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) Macrì, P. Sagnotti, L. Dinarès-Turell, J. Caburlotto, A. Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Caburlotto, A.; Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy 2010-01 http://hdl.handle.net/2122/5942 https://doi.org/10.1016/j.pepi.2009.12.002 en eng Elsevier B.V. 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J. Int. 131, 310–324. Nowaczyk, N., Frederichs, T., 1999. Geomagnetic events and relative paleointensity variations during the last 300 ka as recorded in Kolbeinsey Ridge sediments, Iceland Sea, indication for a strongly variable geomagnetic field. Int. J. Earth Sci. 88, 116–131. Oda, H., Shibuya, H., 1996. Deconvolution of long-core paleomagnetic data of Ocean Drilling Program by Akaike’s Bayesian Information Criterion minimization. J. Geophys. Res. 101, 2815–2834. Paillard, D., Labeyrie, L., Yiou, P., 1996. Macintosh program performs time-series analysis. Eos, Trans. Am. Geophys. Un. 77, 397. Quidelleur, X., Carlut, J., Soler, V., Valet, J.-P., Gillot, P.-Y., 2003. The age and duration of the Matuyama–Brunhes transition from new K-Ar data from La Palma (Canary Islands) and revisited 40Ar/39Ar ages. Earth Planet. Sci. Lett. 208, 149–163. Rebesco, M., Larter, R.D., Barker, P.F., Camerlenghi, A., Vanneste, L.E., 1997. 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Brachfeld, S.A., Domack, E.W., Kissel, C., Laj, C., Leventer, A., Ishman, S.E., Gilbert, R., Camerlenghi, A., Eglinton, L.B., 2003. Holocene history of the Larsen Ice shelf constrained by geomagnetic paleointensity dating. Geology 31, 749–752. Brancolini, G., Harris, P.T., 2000. Post Cruise Report AGSO Survey 217: Joint Italian/ Australian Marine Geoscienze Expedition Aboard the R.V. Tangaroa to the Geotge Vth Land Region of East Antartica during February–March, 2000. Australian National Antarctic Research Expeditions Project No. 1044, Wilkes Land Glacial History (WEGA), AGSO Record. Brown, L.L., Singer, B.S., Pickens, J.C., Jicha, B.R., 2004. Paleomagnetic directions and 40Ar//39Ar ages from the Tatara-San Pedro volcanic complex, Chilean Andes: Lava record of a Matuyama–Brunhes precursor? J. Geophys. Res. 109, B12101, doi:10.1029/2004JB003007. Busetti, M., Caburlotto, A., Armand, L., Damiani, D., Giorgetti, G., Lucchi, R.G., Quilty, P.G., Villa, G., 2003. 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Coe, R.S., Singer, B.S., Pringle, M.S., Zhao, X., 2004. Matuyama–Brunhes reversal and Kamikatsura event on Maui: paleomagnetic directions, 40Ar/39Ar ages and implications. Earth Planet. Sci. Lett. 222, 667–684. Day, R., Fuller, M., Schmidt, V.A., 1977. Hysteresis properties of titanomagnetites. Grain-size and compositional dependence. Phys. Earth Planet. Int. 13, 260–267. Deamer, G.A., Kodama, K.P., 1990. Compaction-induced inclination shallowing in synthetic and natural clay-rich sediments. J. Geophys. Res. 95 (B4), 4511–4529. deMenocal, P.B., Ruddiman, W.F., Kent, D.V., 1990. Depth of post-depositional remanence acquisition in deep-sea sediments: a case study of the Brunhes–Matuyama reversal and oxygen isotopic Stage 19.1. Earth Planet. Sci. Lett. 99, 1–13. Dinarès-Turell, J., Sagnotti, L., Roberts, A.P., 2002. Relative geomagnetic paleointensity from the Jaramillo Subchron to the Matuyama/Brunhes boundary as recorded in a Mediterranean piston core. Earth Planet. Sci. 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Rock magnetism article 2010 ftingv https://doi.org/10.1016/j.pepi.2009.12.002 2022-07-29T06:05:37Z Paleomagnetic and rock magnetic investigation was performed on the 35-m long MD03-2595 CADO (Coring Adélie Diatom Oozes) piston core recovered on the continental rise of the Wilkes Land Basin (East Antarctica). Analysis of the characteristic remanent magnetization (ChRM) inclination record indicates a normal magnetic polarity for the uppermost 34m of the sequence and a distinctive abrupt polarity change at the bottom of the core. This polarity change, which spans a 27 cm thick stratigraphic interval, represents a detailed record of the Matuyama–Brunhes (M–B) transition and it is preceded by a sharp oscillation in paleomagnetic directions that may correlate to the M–B precursor event. Paleomagnetic measurements enable reconstruction of geomagnetic relative paleointensity (RPI) variations, and a highresolution age model was established by correlating the CADO RPI curve to the available global reference RPI stack, indicating that the studied sequence reaches back to ca. 800 ka with an average sedimentation rate of 4.4 cm/ka. Orbital periodicities (100 ka and 41 ka) were found in the ChRM inclination record, and a significant coherence of ChRM inclination and RPI record around 100 ka suggests that long-term geomagnetic secular variation in inclination is controlled by changes in the relative strength of the geocentric axial dipole and persistent non-dipole components. Moreover, even if the relatively homogeneous rock magnetic parameters and lithofacies throughout the recovered sequence indicates a substantial stability of the East Antarctic Ice Sheet during the middle and late Pleistocene, influence of the 100 ka and 41 ka orbital periodicities has been detected in some rock magnetic parameters, indicating subtle variations in the concentration and grain-size of the magnetic minerals linked to orbital forcing of the global climate. Published 72-86 2.2. Laboratorio di paleomagnetismo JCR Journal reserved Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Antarctic East Antarctic Ice Sheet East Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Physics of the Earth and Planetary Interiors 179 1-2 72 86

Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama–Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)

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