Magnetic properties of ODP Site 175-1075
We present sediment magnetic and chemical analysis of cyclic ocean sediments of the upwelling region of the Lower Congo Basin (equatorial Atlantic). We investigated two >100-k.y. intervals from Ocean Drilling Program Site 1075 to analyze the hysteresis properties, sources of magnetic susceptibili...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.735259 2023-05-15T18:21:13+02:00 Magnetic properties of ODP Site 175-1075 Richter, Carl Blum, Peter Röhl, Ursula LATITUDE: -4.785300 * LONGITUDE: 10.074983 * DATE/TIME START: 1997-08-23T19:50:00 * DATE/TIME END: 1997-08-25T18:10:00 2001-03-19 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.735259 https://doi.org/10.1594/PANGAEA.735259 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.735259 https://doi.org/10.1594/PANGAEA.735259 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Richter, Carl; Blum, Peter; Röhl, Ursula (2001): Data report: Magnetic properties and XRF-scanner data of Site 1075 (Lower Congo Basin). In: Wefer, G; Berger, WH; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 175, 1-31, https://doi.org/10.2973/odp.proc.sr.175.214.2001 175-1075A 175-1075B Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP Dataset 2001 ftpangaea https://doi.org/10.1594/PANGAEA.735259 https://doi.org/10.2973/odp.proc.sr.175.214.2001 2023-01-20T07:31:42Z We present sediment magnetic and chemical analysis of cyclic ocean sediments of the upwelling region of the Lower Congo Basin (equatorial Atlantic). We investigated two >100-k.y. intervals from Ocean Drilling Program Site 1075 to analyze the hysteresis properties, sources of magnetic susceptibility, anhysteretic remanent magnetizations, thermomagnetic behavior, and element concentrations of Fe, Ca, Ti, Mn, and K using an X-ray fluorescence (XRF) core scanner. The upper interval was sampled between 14 and 32 meters composite depth (mcd; 0.09-0.21 Ma) and the lower between 141 and 163 mcd (1.31-1.54 Ma) at a resolution of 20 cm, which represents a temporal resolution of 2.0 and 1.3 k.y., respectively. XRF core-scanner data were acquired at 5-cm intervals. The measurements show that ferri(o)magnetic minerals have no significant influence on the cyclicity of the magnetic susceptibility, which is dominated by paramagnetic and diamagnetic minerals and reflects changes of sediment input from the Congo River. The Fe, Ti, K, and Mn concentrations covary with the magnetic susceptibility where high concentrations of these elements correlate with intervals of high susceptibility and low concentrations with intervals of low susceptibility. The Ca counts correlate well with the calcium carbonate concentration but do not show the same cyclicity as the other elements or the susceptibility. With the exception of the Ca concentration, which is significantly higher in the upper interval, and the magnetic grain size, which indicates that less fine grained magnetite is present in the lower interval, no significant differences in the properties of the upper and the lower intervals were detected. Dataset South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(10.074983,10.074983,-4.785300,-4.785300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
175-1075A 175-1075B Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
spellingShingle |
175-1075A 175-1075B Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP Richter, Carl Blum, Peter Röhl, Ursula Magnetic properties of ODP Site 175-1075 |
topic_facet |
175-1075A 175-1075B Benguela Current South Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg175 Ocean Drilling Program ODP |
description |
We present sediment magnetic and chemical analysis of cyclic ocean sediments of the upwelling region of the Lower Congo Basin (equatorial Atlantic). We investigated two >100-k.y. intervals from Ocean Drilling Program Site 1075 to analyze the hysteresis properties, sources of magnetic susceptibility, anhysteretic remanent magnetizations, thermomagnetic behavior, and element concentrations of Fe, Ca, Ti, Mn, and K using an X-ray fluorescence (XRF) core scanner. The upper interval was sampled between 14 and 32 meters composite depth (mcd; 0.09-0.21 Ma) and the lower between 141 and 163 mcd (1.31-1.54 Ma) at a resolution of 20 cm, which represents a temporal resolution of 2.0 and 1.3 k.y., respectively. XRF core-scanner data were acquired at 5-cm intervals. The measurements show that ferri(o)magnetic minerals have no significant influence on the cyclicity of the magnetic susceptibility, which is dominated by paramagnetic and diamagnetic minerals and reflects changes of sediment input from the Congo River. The Fe, Ti, K, and Mn concentrations covary with the magnetic susceptibility where high concentrations of these elements correlate with intervals of high susceptibility and low concentrations with intervals of low susceptibility. The Ca counts correlate well with the calcium carbonate concentration but do not show the same cyclicity as the other elements or the susceptibility. With the exception of the Ca concentration, which is significantly higher in the upper interval, and the magnetic grain size, which indicates that less fine grained magnetite is present in the lower interval, no significant differences in the properties of the upper and the lower intervals were detected. |
format |
Dataset |
author |
Richter, Carl Blum, Peter Röhl, Ursula |
author_facet |
Richter, Carl Blum, Peter Röhl, Ursula |
author_sort |
Richter, Carl |
title |
Magnetic properties of ODP Site 175-1075 |
title_short |
Magnetic properties of ODP Site 175-1075 |
title_full |
Magnetic properties of ODP Site 175-1075 |
title_fullStr |
Magnetic properties of ODP Site 175-1075 |
title_full_unstemmed |
Magnetic properties of ODP Site 175-1075 |
title_sort |
magnetic properties of odp site 175-1075 |
publisher |
PANGAEA |
publishDate |
2001 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.735259 https://doi.org/10.1594/PANGAEA.735259 |
op_coverage |
LATITUDE: -4.785300 * LONGITUDE: 10.074983 * DATE/TIME START: 1997-08-23T19:50:00 * DATE/TIME END: 1997-08-25T18:10:00 |
long_lat |
ENVELOPE(10.074983,10.074983,-4.785300,-4.785300) |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Supplement to: Richter, Carl; Blum, Peter; Röhl, Ursula (2001): Data report: Magnetic properties and XRF-scanner data of Site 1075 (Lower Congo Basin). In: Wefer, G; Berger, WH; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 175, 1-31, https://doi.org/10.2973/odp.proc.sr.175.214.2001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.735259 https://doi.org/10.1594/PANGAEA.735259 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.735259 https://doi.org/10.2973/odp.proc.sr.175.214.2001 |
_version_ |
1766200379142307840 |