Sr/Ca Ratios in Marine Barite: Implications for Chemical Weathering Rates and Dissolved Fluxes to the Ocean
Sr/Ca Ratios in Marine Barite: Implications for Chemical Weathering Rates and Dissolved Fluxes to the Ocean
批准号:
9905362
负责人:
Adina Paytan
金额:
$16.81万
依托单位:
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1999
资助国家:
美国
项目状态:
已结题
起止时间:
1999-08-15 至 2003-01-31
中文摘要
本项目将探索利用深海沉积物中的重晶石来追踪中白垩纪以来海水[Sr]和[Ca]的变化。将对一组岩心顶部进行分析,以确认重晶石可靠地记录了现代海水浓度。研究人员将对太平洋和大西洋的ODP岩心进行大约1-2百万年间隔的样本分析,以确定重晶石浓度是否在全球范围内一致。还将对选定的样品进行Sr同位素分析,以便将这些地点与全球Sr同位素记录联系起来。
英文摘要
This project will explore the use of barite in deep-sea sediments to trace the variations in seawater [Sr] and [Ca] since the middle Cretaceous. A suite of core tops will be analyzed to confirm that barite reliably records modern seawater concentrations. Samples at roughly 1-2 million-year intervals will be analyzed from ODP cores in the Pacific and Atlantic Oceans to determine whether the barite concentrations are globally consistent. Selected samples will also be anlayzed for Sr isotopes, in order to correlate the sites to the lobal Sr isotopic record.
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