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Establishing a new and detailed mid-Cretaceous palaeoceanographic record for the SE Pacific domain from Peru - Phase 2

为秘鲁东南太平洋地区建立新的详细的白垩纪中期古海洋记录 - 第二阶段

基本信息

批准号：
230632854
负责人：
Professor Dr. Stephane Bodin
金额：
--
依托单位：
Institut de géologie et de paléontologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/230632854?language=en
关键词：
Establishing new detailed mid Cretaceous

项目摘要

Our understanding of the mid-Cretaceous (Aptian to Turonian) paleoceanography of the east Pacific realm is severely hampered by the poor recovery of pelagic sequences from OPD and IODP core material and a limited number of land-based studies. At present, only a very limited number of studies from for example Mexico and Columbia exist. Therefore, well-constrained data on the impact of mid-Cretaceous anoxic events (OAE) in the SE Pacific are extremely rare, a feature that highlights the disproportional regional bias of Atlantic and Tethyan case studies. As a result of a DAAD scholarship obtained by the Peruvian PhD student Mr. Juan Pablo Navarro Ramirez for 3.5 years, and thanks to the generous support of the DFG (proposal BO 3655/2), we have been able to perform a first phase of fieldwork and compile a synthetic chemostratigraphic sections spanning the latest Aptian - Turonian interval in the Cajamarca region. We have clearly documented that fieldwork in Peru is achievable and that bulk micrite carbon isotope sections bear the characteristics of well-studied intervals in Europe and elsewhere. Here, we apply for a renewed support of the DFG (phase 2 of this project), scheduled to last 27 months. We would like to perform a second fieldwork phase that aims at assessing the spatial differences in the carbon isotope signature, and hence local carbon signals, of the vast epeiric neritic shelf of South America in Peru. It also aims at understanding the role of regional vs. global nutrient level changes in the production and preservation of organic matter in Peru.

我们对东太平洋地区中白垩世（阿普纪至Turonian）古海洋学的认识受到OPD和IODP岩心材料中远洋层序恢复不足和陆地研究数量有限的严重阻碍。目前，来自墨西哥和哥伦比亚等国的研究数量非常有限。因此，关于中白垩纪缺氧事件（OAE）对东南太平洋影响的严格约束数据极为罕见，这一特征突出了大西洋和特提斯案例研究的不成比例的区域偏见。由于秘鲁博士生Juan Pablo Navarro Ramirez先生获得了为期3.5年的DAAD奖学金，并感谢DFG（提案BO 3655/2）的慷慨支持，我们得以进行第一阶段的实地工作，并编制了卡哈玛卡地区最新阿普tian - Turonian段的合成化学地层剖面。我们已经清楚地证明，在秘鲁的实地工作是可以实现的，而且大块泥晶碳同位素剖面具有在欧洲和其他地方经过充分研究的层段的特征。在此，我们申请重新支持DFG（该项目的第二阶段），计划持续27个月。我们希望进行第二阶段的实地考察，目的是评估南美洲秘鲁广阔的浅海陆架的碳同位素特征的空间差异，从而评估当地的碳信号。它还旨在了解区域与全球营养水平变化在秘鲁有机物质生产和保存中的作用。