The middle Eocene climatic optimum (MECO) event in the
We report a high-resolution paleomagnetic investigation constrained by new qualitative and semi-quantitative analyses of planktic and benthic foraminifera, nannofossil assemblages, integrated with oxygen and carbon isotope measurements, for the middle Eocene Scaglia limestones of the Contessa Highwa...
| Published in: | Journal of Geophysical Research: Solid Earth |
|---|---|
| Main Authors: | , , , , , , , |
| Other Authors: | , , , , , , , , , , , , |
| Format: | Manuscript |
| Language: | English |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://hdl.handle.net/2122/2186 |
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ftingv:oai:www.earth-prints.org:2122/2186 |
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Open Polar |
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Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
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ftingv |
| language |
English |
| topic |
Eocene magnetostratigraphy 02. Cryosphere::02.03. Ice cores::02.03.05. Paleoclimate |
| spellingShingle |
Eocene magnetostratigraphy 02. Cryosphere::02.03. Ice cores::02.03.05. Paleoclimate Jovane, L. Florindo, F. Coccioni, R. Dinarès-Turell, J. Marsili, A. Monechi, S. Roberts, A. Sprovieri, M. The middle Eocene climatic optimum (MECO) event in the |
| topic_facet |
Eocene magnetostratigraphy 02. Cryosphere::02.03. Ice cores::02.03.05. Paleoclimate |
| description |
We report a high-resolution paleomagnetic investigation constrained by new qualitative and semi-quantitative analyses of planktic and benthic foraminifera, nannofossil assemblages, integrated with oxygen and carbon isotope measurements, for the middle Eocene Scaglia limestones of the Contessa Highway section, central Italy. Calcareous plankton assemblages enables recognition of several biostratigraphic events from planktic foraminiferal Zone P11 to the lower part of Zone P15 and from calcareous nannofossil Zone NP15 to the upper part of Zone NP17, which results in refinement of the magnetobiostratigraphy of the Contessa Highway section. Correlation of the paleomagnetic polarity pattern with the geomagnetic polarity timescale provides a direct age interpretation for strata around the middle Eocene Scaglia limestones of the Contessa 2 Highway section, from Chrons C21n (47 Ma) through to Subchron C18n.1n (38.5 Ma). Bulk carbon isotope values indicate a distinct carbon isotopic shift at 40 Ma that is interpreted to represent the first evidence in the northern hemisphere of the middle Eocene climatic optimum that has recently been observed as a stable isotope anomaly in multiple records from the Indian-Atlantic sector of the Southern Ocean. This should demonstrate a global response of carbon cycle to the proposed transient increased pCO2 levels during the late middle Eocene and a consequent global CO2-driven climate change. Submitted open |
| author2 |
Jovane, L.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Coccioni, R.; Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”, Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Marsili, A.; Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”, Monechi, S.; Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, 50121, Roberts, A.; National Oceanography Centre, Southampton, University of Southampton, European Way, Sprovieri, M.; Istituto Ambiente Marino Costiero (CNR), Calata Porta di Massa (Interno Porto di Napoli), Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”, Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, 50121, National Oceanography Centre, Southampton, University of Southampton, European Way, Istituto Ambiente Marino Costiero (CNR), Calata Porta di Massa (Interno Porto di Napoli) |
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Manuscript |
| author |
Jovane, L. Florindo, F. Coccioni, R. Dinarès-Turell, J. Marsili, A. Monechi, S. Roberts, A. Sprovieri, M. |
| author_facet |
Jovane, L. Florindo, F. Coccioni, R. Dinarès-Turell, J. Marsili, A. Monechi, S. Roberts, A. Sprovieri, M. |
| author_sort |
Jovane, L. |
| title |
The middle Eocene climatic optimum (MECO) event in the |
| title_short |
The middle Eocene climatic optimum (MECO) event in the |
| title_full |
The middle Eocene climatic optimum (MECO) event in the |
| title_fullStr |
The middle Eocene climatic optimum (MECO) event in the |
| title_full_unstemmed |
The middle Eocene climatic optimum (MECO) event in the |
| title_sort |
middle eocene climatic optimum (meco) event in the |
| publishDate |
2006 |
| url |
http://hdl.handle.net/2122/2186 |
| geographic |
Indian Southern Ocean |
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Indian Southern Ocean |
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Southern Ocean |
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Southern Ocean |
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Backman, J., 1987, Quantitative calcareous nannofossil biochronology of middle Eocene through early Oligocene sediments from DSDP Site 522 and 523: Abhandlungen der Geologische Bundesanstalt, v.39, p. 21-31. Berggren, W.A., Kent, D.V., Swisher, C.C., Aubry, M.P., 1995, A revised Cenozoic geochronology and chronostratigraphy, in Berggren, W.A., Kent, D.V., Aubry, M.P., Hardenbol, J. (Eds.), Geochronology, Time Scales and Global Stratigraphic Correlation, Society for Sedimentary Geology (SEPM) Special Publication 54, p. 129-212. Blow, W.H., 1969, Late middle Eocene to Recent planktonic foraminiferal biostratigraphy, in Brönniman, P., Renz, H.H. (eds.), Proc. 1st International Conference on Planktonic Microfossils (Geneva, 1967). E.J. Brill, Leiden, v. 1, p. 199-421. Blow, W.H., 1979, The Cenozoic Globigerinida: A Study of the Morphology. Taxonomy. Evolutionary Relationships and the Stratigraphical Distribution of some Globigerinida (mainly Globigerinacea): Leiden, E.J. Brill, v. 3, p. 1413. Bohaty, S. M., and Zachos, J. C., 2003, Significant Southern Ocean warming event in the late middle Eocene: Geology, v. 31, p. 1017-1020. Bolli, H.M., 1957a, The genera Globigerina and Globorotalia in the Paleocene-lower Eocene Lizard Springs Formation of Trinidad: B.W.I., United States National Museum Bulletin, v. 215, p. 51-81. Bolli, H.M., 1957b, Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad: B.W.I., United States National Museum Bulletin, v. 215, p. 155-172. Bolli, H.M., 1966, Zonation of Cretaceous to Pliocene marine sediments based on planktonic foraminifera: Boletino Informativo Associacion Venezolana de Geologia, Mineria y Petrolio, v. 9, p. 3-32. Bown, P.R., and Young, J., 1998, Techniques, in Calcareous Nannofossil biostratigraphy, Bown P.R. (ed.) Chapman & Hall, p. 16-28. 18 Cande, S.C., and Kent, D.V., 1995, Revised calibration of the geomagnetic polarity time scale for the late Cretaceous and Cenozoic: Journal of Geophysical Research, v. 100, p. 6093–6095, doi:10.1029/94JB03098. Catanzariti R., and Perilli N., 2004, Nannobiohorizons recognised in Eocene formations from the Northern Appennines (Italy): Ina10 Abstracts, Lisbon. Journal of Nannoplakton Research, v. 26, p. 16-17. Channell, J.E.T., D’Argenio, B., and Horwath, F., 1979, Adria, the African Promontory, in Mesozoic Mediterranean Palaeogeography: Earth Science Review, v. 15, p. 213-292. Channell, J.E.T., Freeman, R., Heller, F., and Lowrie, W., 1982, Timing of diagenetic haematite growth in red pelagic limestones from Gubbio (Italy): Earth and Planetary Science Letters, v. 58, p. 189-201. Corfield, R.M., Cartlidge, J.E., Premoli-Silva, I., Housley, R.A., 1991, Oxygen and carbon isotope stratigraphy of the Palaeogene and Cretaceous limestones in the Bottaccione Gorge and the Contessa Highway sections, Umbria, Italy: Terra Nova, v.3, p. 414-422. Cresta, S., Monechi, S., and Parisi, G., 1989, Stratigrafia del Mesozoico al Cenozoico nell’area Umbro-Marchigiana: Memorie Descrittive della Carta Geologica d’Italia, v. 34, p. 185. Florindo, F., Roberts, A.P., 2005, Eocene-Oligocene magnetobiochronology of ODP Sites 689 and 690, Maud Rise, Weddell Sea, Antarctica: Geological Society of America Bullettin, v. 117, p. 46-66. Guerrera, F., Monaco, P., Nocchi, M., Parisi, G., Franchi, R., Vannucci, S., Giovannini, G., 1988, La Scaglia Variegata Eocenica nella sezione di Monte Cagnero (bacino marchigiano interno): studio litostratigrafico, petrografico e biostratigrafico: Bollettino Società Geologica Italiana, v. 107, p. 81-99. Handerbol, J., and Berggren, W.A., 1978, A new Paleogene numerical time scale, in Cohee, G.V., Glaessner, M.F., and Hedberg, H.D., eds., Contributions to the geologic time scale; studies in geology, Tulsa, Oklahoma, American Association of Petroleum Geologists, v. 6, p. 213-234. 19 Kirschvink, J. L., 1980, The least-squares line and plane and the analysis of paleomagnetic data: Geophysical Journal of the Royal Astronomical Society, v. 62, p. 699– 718. LaBreque, J.L., Kent, D.V., and Cande, S.C., 1977, Revised magnetic polarità time scale for Late Cretaceous and Cenozoic time: Geology, v. 5, p. 330-335. Lear, C.H., Rosenthal, Y., Coxall, H.K., Wilson, P.A., 2004, Late Eocene to early Miocene ice sheet dynamics and the global carbon cycle: Paleoceanography, v. 19, PA4015, doi:10.1029/2004PA001039. Lirer, F., 2000, A new technique for retrieving calcareous microfossils from lithified lime deposits: Micropaleontology, v. 46, p. 365-369. Lowrie, W., Alvarez, W., Napoleone, G., Perch-Nielsen, K., Premoli Silva, I., Toumarkine, M., 1982, Paleogene magnetic stratigraphy in Umbrian pelagic carbonate rocks: The Contessa sections, Gubbio: Geological Society of America Bulletin, v. 93, p. 414-432. Lyle, M., Wilson, P.A., Janecek, T.R., et al., 2002, Proc. ODP, Init. Repts., 199 [Online], Available from World Wide Web: http://www-odp.tamu.edu/publications/199_IR/199ir.htm. Marino, M., and Flores, J. A., 2002, Middle Eocene to Early Oligocene calcareous nannofossil stratigraphy at Leg 177 Site 1090: Marine Micropaleonatology, v. 45, p. 383-398. Martini, E., 1971, Standard Tertiary and Quaternary calcareous nannoplankton zonation, in Farinacci, A., ed., Proceedings of the Second Planktonic Conference, Roma 1970, Tecnoscienza, Roma, v. 2, p. 739-785. Mattias, P., Farabollini, P., and Montanari, A., 1989, Aspetti minero-petrografici della Scaglia Variegata nella serie pelagica della valle della Contessa, presso Gubbio, Umbria orientale: Studi Geologici Camerti, v. 11, p. 7-14. Miller, K. G., Wright, J. D., and Fairbanks, R. G., 1991, Unlocking the ice house: Oligocene- Miocene oxygen isotopes, eustacy and margin erosion: Journal of Geophysical Research, v. 96, p. 6829– 6848. 20 Monaco, P., Nocchi, M., and Parisi, G., 1987, Analisi stratigrafica e sedimentologica di alcune sequenze pelagiche dell'Umbria sud-orientale dall'Eocene inferiore all'Oligocene inferiore: Bollettino Società Geologica Italiana, v. 106, p. 71-91. Monechi, S., Thierstein, H.R., 1985, Late Cretaceous-Eocene nannofossil and magnetostratigraphic correlations near Gubbio, Italy: Marine Micropaleonatology, v. 9: p. 419-440. Montanari, A., Bice, D.M., Capo, R., Coccioni, R., Deino, A., De Paolo, D.J., Emmanuel, L., Monechi, S., Renard, M. and Zevenboom, D., 1997, Integrated stratigraphy of the Chattian to mid-Burdigalian pelagic sequence of the Contessa valley (Gubbio, Italy), in Montanari, A., Odin, G.S., and Coccioni, R. (Eds), Miocene Stratigraphy: an Integrated Approach, Elsevier Sciences, p. 249-277. Okada, H., and Bukry, D., 1980, Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry, 1973; 1975): Marine Micropaleontology, v. 5, p. 321-325. Perch-Nielsen, K., 1985, Mesozoic calcareous nannofossils. in Bolli, H.M., Saunders, J.B., Perch- Nielsen, K. (Eds.), Plankton Stratigraphy, Cambridge Univiversity Press, Cambridge, p. 329– 426. Premoli Silva, I., Bolli, H.M., 1973, Late Cretaceous to Eocene planktonic foraminifera and stratigraphy of Leg 15 sites in the Caribbean Sea. in Edgar, N.T., Saunders, J.B. et al. (Eds.), Initial Reports of the Deep Sea Drilling Project, v. 15, p. 449-547. Roberts, A.P., Pike, C.R., Verosub, K.L., 2000, FORC diagrams: a new tool for characterizing the magnetic properties of natural samples: Journal of Geophysical Research, v. 105, p. 28461- 28475. Roberts, A.P., Bicknell, S.J., Byatt, J., Bohaty, S.M., Florindo F., and Harwood, D.M., 2003, Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene - Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748): Palaeogeography, Palaeoclimatology, Palaeoecology, v. 198, p. 145-168. 21 Roggenthen, W.M., 1979, Magnetic mineralogy of pelagic limestone, Gubbio, Italy: Transaction of American Geophysical Union, v. 60, p. 246, abstract. Shackleton, N.J., and Kennett, J.P., 1975, Paleotemperature history of the Cenozoic and the initiation of Antarctic glaciation: Oxygen and carbon isotope analyses in DSDP Sites 277, 279, and 281: Initial Rep. Deep Sea Drill. Project, v. 29, p. 743-755. Spötl, C., and Vennemann, T.W., 2003, Continuous-flow isotope ratio mass spectrometric analysis of carbonate minerals: Rapid Communications Mass Spectrometry, v. 17, p. 1004-1006. Stacey, F.D. and Banerjee, S.K., 1974,The Physical Principles of Rock Magnetism, Elsevier, New York. Stickley, C.E., Brinkhuis, H., McGonigal, K.L., Chaproniere, G.C.H., Fuller, M., Kelly, D.C., Nürnberg, D., Pfuhl, H.A., Schellenberg, S.A., Schoenfeld, J., Suzuki, N., Touchard, Y., Wei, W., Williams, G.L., Lara, J., and Stant, S.A., 2004, Late Cretaceous-Quaternary biomagnetostratigraphy of ODP Sites 1168, 1170, 1171, and 1172, Tasmanian Gateway, in Exon, N.F., Kennett, J.P., and Malone, M.J. (Eds.), Proc. ODP, Sci. Results, 189 [Online]. Available from World Wide Web: http://wwwodp. tamu.edu/publications/189_SR/111/111.htm. Van Morkhoven, F.P.C.M., Berggren, W.A., and Edwards, A.S., 1986, Cenozoic Cosmopolitan Deep-Water Benthic Foraminifera: Bulletin Centre Recherces Exploration-Production: Elf- Aquitaine, Memories, v. 11, p.421. Varol, O., 1998, Paleogene, in Bown, P.R. (Ed.), Calcareous Nannofossil Biostratigraphy. Kluwer Academic Publishing, Dordrecht, p. 201-224. Verducci, M. and Nocchi, M., 2004, Middle to Late Eocene main planktonic foraminiferal events in the Central Mediterranean area (Umbria-Marche basin) related to paleoclimatic changes: Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, v. 234, p. 361-413. Wei, W., McGonigal, K.L., and Zhong, S., 2003, Data report: Paleogene calcareous nannofossil biostratigraphy of ODP Leg 189 (Australia-Antarctica Gateway), in Exon, N.F., Kennett, J.P., 22 and Malone, M.J. (Eds.), Proc. ODP, Sci. Results, 189 [Online]. Available from World Wide Web: http://www-odp.tamu.edu/publications/189_SR/103/103.htm. Zijderveld, J. D. A., 1967, A.C. demagnetization of rocks: Analysis of results, in Methods in Paleomagnetism, edited by D. W. Collinson, Elsevier Sciences., New York, p. 254– 286. http://hdl.handle.net/2122/2186 |
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ftingv:oai:www.earth-prints.org:2122/2186 2023-05-15T18:25:36+02:00 The middle Eocene climatic optimum (MECO) event in the Jovane, L. Florindo, F. Coccioni, R. Dinarès-Turell, J. Marsili, A. Monechi, S. Roberts, A. Sprovieri, M. Jovane, L.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Coccioni, R.; Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”, Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Marsili, A.; Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”, Monechi, S.; Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, 50121, Roberts, A.; National Oceanography Centre, Southampton, University of Southampton, European Way, Sprovieri, M.; Istituto Ambiente Marino Costiero (CNR), Calata Porta di Massa (Interno Porto di Napoli), Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”, Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, 50121, National Oceanography Centre, Southampton, University of Southampton, European Way, Istituto Ambiente Marino Costiero (CNR), Calata Porta di Massa (Interno Porto di Napoli) 2006 1503275 bytes application/pdf http://hdl.handle.net/2122/2186 en eng Backman, J., 1987, Quantitative calcareous nannofossil biochronology of middle Eocene through early Oligocene sediments from DSDP Site 522 and 523: Abhandlungen der Geologische Bundesanstalt, v.39, p. 21-31. Berggren, W.A., Kent, D.V., Swisher, C.C., Aubry, M.P., 1995, A revised Cenozoic geochronology and chronostratigraphy, in Berggren, W.A., Kent, D.V., Aubry, M.P., Hardenbol, J. (Eds.), Geochronology, Time Scales and Global Stratigraphic Correlation, Society for Sedimentary Geology (SEPM) Special Publication 54, p. 129-212. Blow, W.H., 1969, Late middle Eocene to Recent planktonic foraminiferal biostratigraphy, in Brönniman, P., Renz, H.H. (eds.), Proc. 1st International Conference on Planktonic Microfossils (Geneva, 1967). E.J. Brill, Leiden, v. 1, p. 199-421. Blow, W.H., 1979, The Cenozoic Globigerinida: A Study of the Morphology. Taxonomy. Evolutionary Relationships and the Stratigraphical Distribution of some Globigerinida (mainly Globigerinacea): Leiden, E.J. Brill, v. 3, p. 1413. Bohaty, S. M., and Zachos, J. C., 2003, Significant Southern Ocean warming event in the late middle Eocene: Geology, v. 31, p. 1017-1020. Bolli, H.M., 1957a, The genera Globigerina and Globorotalia in the Paleocene-lower Eocene Lizard Springs Formation of Trinidad: B.W.I., United States National Museum Bulletin, v. 215, p. 51-81. Bolli, H.M., 1957b, Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad: B.W.I., United States National Museum Bulletin, v. 215, p. 155-172. Bolli, H.M., 1966, Zonation of Cretaceous to Pliocene marine sediments based on planktonic foraminifera: Boletino Informativo Associacion Venezolana de Geologia, Mineria y Petrolio, v. 9, p. 3-32. Bown, P.R., and Young, J., 1998, Techniques, in Calcareous Nannofossil biostratigraphy, Bown P.R. (ed.) Chapman & Hall, p. 16-28. 18 Cande, S.C., and Kent, D.V., 1995, Revised calibration of the geomagnetic polarity time scale for the late Cretaceous and Cenozoic: Journal of Geophysical Research, v. 100, p. 6093–6095, doi:10.1029/94JB03098. Catanzariti R., and Perilli N., 2004, Nannobiohorizons recognised in Eocene formations from the Northern Appennines (Italy): Ina10 Abstracts, Lisbon. Journal of Nannoplakton Research, v. 26, p. 16-17. Channell, J.E.T., D’Argenio, B., and Horwath, F., 1979, Adria, the African Promontory, in Mesozoic Mediterranean Palaeogeography: Earth Science Review, v. 15, p. 213-292. Channell, J.E.T., Freeman, R., Heller, F., and Lowrie, W., 1982, Timing of diagenetic haematite growth in red pelagic limestones from Gubbio (Italy): Earth and Planetary Science Letters, v. 58, p. 189-201. Corfield, R.M., Cartlidge, J.E., Premoli-Silva, I., Housley, R.A., 1991, Oxygen and carbon isotope stratigraphy of the Palaeogene and Cretaceous limestones in the Bottaccione Gorge and the Contessa Highway sections, Umbria, Italy: Terra Nova, v.3, p. 414-422. Cresta, S., Monechi, S., and Parisi, G., 1989, Stratigrafia del Mesozoico al Cenozoico nell’area Umbro-Marchigiana: Memorie Descrittive della Carta Geologica d’Italia, v. 34, p. 185. Florindo, F., Roberts, A.P., 2005, Eocene-Oligocene magnetobiochronology of ODP Sites 689 and 690, Maud Rise, Weddell Sea, Antarctica: Geological Society of America Bullettin, v. 117, p. 46-66. Guerrera, F., Monaco, P., Nocchi, M., Parisi, G., Franchi, R., Vannucci, S., Giovannini, G., 1988, La Scaglia Variegata Eocenica nella sezione di Monte Cagnero (bacino marchigiano interno): studio litostratigrafico, petrografico e biostratigrafico: Bollettino Società Geologica Italiana, v. 107, p. 81-99. Handerbol, J., and Berggren, W.A., 1978, A new Paleogene numerical time scale, in Cohee, G.V., Glaessner, M.F., and Hedberg, H.D., eds., Contributions to the geologic time scale; studies in geology, Tulsa, Oklahoma, American Association of Petroleum Geologists, v. 6, p. 213-234. 19 Kirschvink, J. L., 1980, The least-squares line and plane and the analysis of paleomagnetic data: Geophysical Journal of the Royal Astronomical Society, v. 62, p. 699– 718. LaBreque, J.L., Kent, D.V., and Cande, S.C., 1977, Revised magnetic polarità time scale for Late Cretaceous and Cenozoic time: Geology, v. 5, p. 330-335. Lear, C.H., Rosenthal, Y., Coxall, H.K., Wilson, P.A., 2004, Late Eocene to early Miocene ice sheet dynamics and the global carbon cycle: Paleoceanography, v. 19, PA4015, doi:10.1029/2004PA001039. Lirer, F., 2000, A new technique for retrieving calcareous microfossils from lithified lime deposits: Micropaleontology, v. 46, p. 365-369. Lowrie, W., Alvarez, W., Napoleone, G., Perch-Nielsen, K., Premoli Silva, I., Toumarkine, M., 1982, Paleogene magnetic stratigraphy in Umbrian pelagic carbonate rocks: The Contessa sections, Gubbio: Geological Society of America Bulletin, v. 93, p. 414-432. Lyle, M., Wilson, P.A., Janecek, T.R., et al., 2002, Proc. ODP, Init. Repts., 199 [Online], Available from World Wide Web: http://www-odp.tamu.edu/publications/199_IR/199ir.htm. Marino, M., and Flores, J. A., 2002, Middle Eocene to Early Oligocene calcareous nannofossil stratigraphy at Leg 177 Site 1090: Marine Micropaleonatology, v. 45, p. 383-398. Martini, E., 1971, Standard Tertiary and Quaternary calcareous nannoplankton zonation, in Farinacci, A., ed., Proceedings of the Second Planktonic Conference, Roma 1970, Tecnoscienza, Roma, v. 2, p. 739-785. Mattias, P., Farabollini, P., and Montanari, A., 1989, Aspetti minero-petrografici della Scaglia Variegata nella serie pelagica della valle della Contessa, presso Gubbio, Umbria orientale: Studi Geologici Camerti, v. 11, p. 7-14. Miller, K. G., Wright, J. D., and Fairbanks, R. G., 1991, Unlocking the ice house: Oligocene- Miocene oxygen isotopes, eustacy and margin erosion: Journal of Geophysical Research, v. 96, p. 6829– 6848. 20 Monaco, P., Nocchi, M., and Parisi, G., 1987, Analisi stratigrafica e sedimentologica di alcune sequenze pelagiche dell'Umbria sud-orientale dall'Eocene inferiore all'Oligocene inferiore: Bollettino Società Geologica Italiana, v. 106, p. 71-91. Monechi, S., Thierstein, H.R., 1985, Late Cretaceous-Eocene nannofossil and magnetostratigraphic correlations near Gubbio, Italy: Marine Micropaleonatology, v. 9: p. 419-440. Montanari, A., Bice, D.M., Capo, R., Coccioni, R., Deino, A., De Paolo, D.J., Emmanuel, L., Monechi, S., Renard, M. and Zevenboom, D., 1997, Integrated stratigraphy of the Chattian to mid-Burdigalian pelagic sequence of the Contessa valley (Gubbio, Italy), in Montanari, A., Odin, G.S., and Coccioni, R. (Eds), Miocene Stratigraphy: an Integrated Approach, Elsevier Sciences, p. 249-277. Okada, H., and Bukry, D., 1980, Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry, 1973; 1975): Marine Micropaleontology, v. 5, p. 321-325. Perch-Nielsen, K., 1985, Mesozoic calcareous nannofossils. in Bolli, H.M., Saunders, J.B., Perch- Nielsen, K. (Eds.), Plankton Stratigraphy, Cambridge Univiversity Press, Cambridge, p. 329– 426. Premoli Silva, I., Bolli, H.M., 1973, Late Cretaceous to Eocene planktonic foraminifera and stratigraphy of Leg 15 sites in the Caribbean Sea. in Edgar, N.T., Saunders, J.B. et al. (Eds.), Initial Reports of the Deep Sea Drilling Project, v. 15, p. 449-547. Roberts, A.P., Pike, C.R., Verosub, K.L., 2000, FORC diagrams: a new tool for characterizing the magnetic properties of natural samples: Journal of Geophysical Research, v. 105, p. 28461- 28475. 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Paleoclimate manuscript 2006 ftingv 2022-07-29T06:04:24Z We report a high-resolution paleomagnetic investigation constrained by new qualitative and semi-quantitative analyses of planktic and benthic foraminifera, nannofossil assemblages, integrated with oxygen and carbon isotope measurements, for the middle Eocene Scaglia limestones of the Contessa Highway section, central Italy. Calcareous plankton assemblages enables recognition of several biostratigraphic events from planktic foraminiferal Zone P11 to the lower part of Zone P15 and from calcareous nannofossil Zone NP15 to the upper part of Zone NP17, which results in refinement of the magnetobiostratigraphy of the Contessa Highway section. Correlation of the paleomagnetic polarity pattern with the geomagnetic polarity timescale provides a direct age interpretation for strata around the middle Eocene Scaglia limestones of the Contessa 2 Highway section, from Chrons C21n (47 Ma) through to Subchron C18n.1n (38.5 Ma). Bulk carbon isotope values indicate a distinct carbon isotopic shift at 40 Ma that is interpreted to represent the first evidence in the northern hemisphere of the middle Eocene climatic optimum that has recently been observed as a stable isotope anomaly in multiple records from the Indian-Atlantic sector of the Southern Ocean. This should demonstrate a global response of carbon cycle to the proposed transient increased pCO2 levels during the late middle Eocene and a consequent global CO2-driven climate change. Submitted open Manuscript Southern Ocean Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Indian Southern Ocean Journal of Geophysical Research: Solid Earth 100 B4 6093 6095 |