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Carbonate Deposition Rates from Cretaceous to present

白垩纪至今碳酸盐沉积速率

基本信息

批准号：
14540434
负责人：
NAKAMORI Toru
金额：
$ 1.98万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540434/
关键词：
Cretaceous Carbonate Deposition Rates Carbon Cycle Model Stable Isotope Ratio of Sr Atlantic Ocean Chemical concentration OD Core Samples XRF Method 炭酸塩堆積速度二酸化炭素物質循環データベースボックスモデル

项目摘要

1.Data BaseInitial Reports and Scientific Results of the ODP and DSDP were referred to collect global depositional rates, core density, oxygen and carbon stable isotope ratio, and chemical concentration of core samples drilled at each project. We obtain the global mean flux of carbonate and other components by adding the accumulation rates on deep-sea floors and those on continents at the duration of 0.5 million year from Cretaceous to present. The global carbonate accumulation rates were high in the Cretaceous and Neogene, while those in the Pateogene were low. It is noteworthy that they were extremely high from Upper Miocene to Pleistocene. Calculation based on the carbon and Sr circulation model suggest that weathering at the Himalayan and Tibetan Plateau was more important than that of volcanism.2.Chemical analysis of core samplesChemical contents of the core samples drilled during the ODP Leg 159, Site 959D from Cretaceous to present were investigated by XRF, carbonate bomb, organic contents, and biogenic silica methods. It is difficult to correlate the trend in the carbonate deposition rate of this core to those in global accumulation rates due to the local environmental changes in the Atlantic.

1.参考ODP和DSDP的初始报告和科学结果，收集了每个项目钻探的岩心样品的全球沉积速率、岩心密度、氧碳稳定同位素比和化学浓度。将白垩纪至今50万年的深海海底积累速率和大陆积累速率相加，得到了全球平均碳酸盐通量和其他组分的通量。全球碳酸盐岩成藏速率在白垩纪和新近纪较高，而在晚第三纪较低。值得注意的是，在上中新世至更新世期间，它们非常高。岩心样品的化学分析利用XRF、碳酸盐弹、有机含量和生物硅法研究了ODP第159号、959D地点自白垩纪至今钻探的岩心样品的化学含量。由于大西洋局部环境的变化，很难将该岩心的碳酸盐沉积速率趋势与全球聚集速率趋势联系起来。