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首页> 外文期刊>Paleoceanography >Os isotope chemostratigraphy applied to organic-rich marine sediments from the Eocene-Oligocene transition on the West African margin (ODP Site 959)
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Os isotope chemostratigraphy applied to organic-rich marine sediments from the Eocene-Oligocene transition on the West African margin (ODP Site 959)

机译：Os同位素化学地层学适用于西非边缘始新世-渐新世过渡带富含有机物的海洋沉积物（ODP站点959）

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摘要

The known temporal relationship between the benthic foraminiferal delta(18) O record and the marine Os isotope record is used to reinterpret the absolute chronology and paleoceanographic context of an episode of organic carbon burial on the West African margin Ocean Drilling Program (ODP) Site 959. Although organic-rich sediments require significant corrections for in situ decay of Re-187 to Os-187, these results demonstrate the utility of the marine Os isotope record for chemostratigraphic correlation of organic-rich sediments that are devoid of age diagnostic microfossils with pelagic carbonate sequences. Revision of the ODP Site 959 chronology shifts the age assignment of an interval of biosiliceous, organic-rich sediment deposition from the Oligocene to the late Eocene and earliest Oligocene, likely culminating with the first major glaciation of the Oligocene (Oi1). We speculate that enhanced organic carbon burial over much of the West African margin may have contributed to drawdown of atmospheric carbon dioxide before and during the Oi1 event and suggest that Os isotope chemostratigraphy provides a valuable tool for further exploring this possibility.
机译：底栖有孔虫三角洲（18）O记录与海洋Os同位素记录之间的已知时间关系用于重新解释西非边缘海洋钻探计划（ODP）现场959发生的有机碳埋藏的绝对年代和古海洋背景。尽管富含有机物的沉积物需要对Re-187到Os-187的原位衰减进行重大校正，但这些结果证明了海洋Os同位素记录对于缺乏年龄诊断性微化石和远洋沉积的化学富集沉积物的化学地层学相关性的作用碳酸盐序列。对ODP站点959的年代进行了修订，将年龄分配从渐新世到晚始新世和最早的渐新世，转变为生物硅质，富含有机质的沉积物，这可能随着渐新世的第一次主要冰川作用而达到顶峰。我们推测，在Oi1事件发生之前和期间，西非边缘大部分地区有机碳埋藏的增加可能有助于减少大气中的二氧化碳，并建议Os同位素化学地层学为进一步探讨这种可能性提供了宝贵的工具。

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