Osmium concentration and isotope composition of ODP Hole 165-1002C (Table 1)
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| Sprache: | en |
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2007
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| author | Oxburgh, Rachel Pierson-Wickmann, Anne-Catherine Reisberg, Laurie Hemming, Sidney R |
| author_facet | Oxburgh, Rachel Pierson-Wickmann, Anne-Catherine Reisberg, Laurie Hemming, Sidney R |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A high resolution record of seawater osmium isotopic composition (35 samples over the past 191,000 yr) has been obtained from sediments from Ocean Drilling Program (ODP) Leg 165 Site 1002 in the Cariaco Basin, Venezuela. Strong correlations are observed between 187Os/188Os and both the local and global oxygen isotopic records, with less radiogenic values observed during glacial intervals. In conjunction with previous analyses of sediments from the East Pacific Rise, the Santa Barbara Basin, and the Japan Sea, the data demonstrate conclusively that there have been ocean-wide changes in seawater 187Os/188Os over the Pleistocene. Global seawater excursions to relatively unradiogenic 187Os/188Os, indicating decreased continental inputs, occur during cold intervals, times of increased aridity and increased ice cover of old (radiogenic) continental masses. The data thus indicate a direct climatic control on chemical weathering rates and/or composition of weathering products on a glacial-interglacial timescale. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_725507 |
| institution | PANGAEA |
| language | en |
| publishDate | 2007 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Osmium concentration and isotope composition of ODP Hole 165-1002C (Table 1) Oxburgh, Rachel Pierson-Wickmann, Anne-Catherine Reisberg, Laurie Hemming, Sidney R 165-1002C; Accumulation rate, Osmium; AGE; Calculated; Cayman Rise, Caribbean Sea; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg165; Negative-thermal ionization mass spectrometry (N-TIMS); Ocean Drilling Program; ODP; Osmium; Osmium-187/Osmium-188 ratio; Sample code/label A high resolution record of seawater osmium isotopic composition (35 samples over the past 191,000 yr) has been obtained from sediments from Ocean Drilling Program (ODP) Leg 165 Site 1002 in the Cariaco Basin, Venezuela. Strong correlations are observed between 187Os/188Os and both the local and global oxygen isotopic records, with less radiogenic values observed during glacial intervals. In conjunction with previous analyses of sediments from the East Pacific Rise, the Santa Barbara Basin, and the Japan Sea, the data demonstrate conclusively that there have been ocean-wide changes in seawater 187Os/188Os over the Pleistocene. Global seawater excursions to relatively unradiogenic 187Os/188Os, indicating decreased continental inputs, occur during cold intervals, times of increased aridity and increased ice cover of old (radiogenic) continental masses. The data thus indicate a direct climatic control on chemical weathering rates and/or composition of weathering products on a glacial-interglacial timescale. |
| title | Osmium concentration and isotope composition of ODP Hole 165-1002C (Table 1) |
| topic | 165-1002C; Accumulation rate, Osmium; AGE; Calculated; Cayman Rise, Caribbean Sea; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg165; Negative-thermal ionization mass spectrometry (N-TIMS); Ocean Drilling Program; ODP; Osmium; Osmium-187/Osmium-188 ratio; Sample code/label |
| url | https://doi.org/10.1594/PANGAEA.725507 |