Strontium isotopic composition and chronology of sediments from DSDP Site 90-588
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
1991
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| _version_ | 1867169498538180608 |
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| author | Hodell, David A Mueller, Paul A Garrido, Jose R |
| author_facet | Hodell, David A Mueller, Paul A Garrido, Jose R |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We report 261 strontium isotopic analyses of well-preserved planktonic foraminifers from three Deep Sea Drilling Project Sites (519, 588, and 607). These samples cover the period from 24 Ma to present with an average of approximately one sample per 100 ka. The combination of high sample density and uniformity of analytical procedures has produced a well-defined record of changes in the 87Sr/86Sr of seawater during the Neogene. The record can be viewed as a series of essentially linear segments with slopes ranging from as high as 0.00006/m.y. to as low as 0/m.y. The times associated with major inflections in the curve do not appear to correspond to simple geologic phenomena such as eustatic cycles, but are probably controlled by a combination of tectonic and climatic factors that influenced the abundance and isotopic composition of terrestrial strontium input to the oceans. The strontium isotopic data are consistent with a progressive increase in the chemical weathering rates of the continents during the Neogene, probably related to repeated glaciations, increased exposure of continents by lowered sea level, and increased continental relief resulting from high rates of tectonic uplift. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_712023 |
| institution | PANGAEA |
| language | en |
| publishDate | 1991 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Strontium isotopic composition and chronology of sediments from DSDP Site 90-588 Hodell, David A Mueller, Paul A Garrido, Jose R 90-588; 90-588A; 90-588C; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg90; South Pacific/Tasman Sea/CONT RISE We report 261 strontium isotopic analyses of well-preserved planktonic foraminifers from three Deep Sea Drilling Project Sites (519, 588, and 607). These samples cover the period from 24 Ma to present with an average of approximately one sample per 100 ka. The combination of high sample density and uniformity of analytical procedures has produced a well-defined record of changes in the 87Sr/86Sr of seawater during the Neogene. The record can be viewed as a series of essentially linear segments with slopes ranging from as high as 0.00006/m.y. to as low as 0/m.y. The times associated with major inflections in the curve do not appear to correspond to simple geologic phenomena such as eustatic cycles, but are probably controlled by a combination of tectonic and climatic factors that influenced the abundance and isotopic composition of terrestrial strontium input to the oceans. The strontium isotopic data are consistent with a progressive increase in the chemical weathering rates of the continents during the Neogene, probably related to repeated glaciations, increased exposure of continents by lowered sea level, and increased continental relief resulting from high rates of tectonic uplift. |
| title | Strontium isotopic composition and chronology of sediments from DSDP Site 90-588 |
| topic | 90-588; 90-588A; 90-588C; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg90; South Pacific/Tasman Sea/CONT RISE |
| url | https://doi.org/10.1594/PANGAEA.712023 |