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Developing an early to middle Miocene benthic foraminiferal isotope chronostratigraphy across the Pacific "paleoequator transect" (IODP PEAT Expedition 320/321)

开发跨太平洋“古赤道样带”早中新世底栖有孔虫同位素年代地层学（IODP PEAT Expedition 320/321）

基本信息

批准号：
142157224
负责人：
Dr. Ann Holbourn
金额：
--
依托单位：
Institut für Geowissenschaften
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/142157224?language=en
关键词：
Developing early middle Miocene benthic

项目摘要

We propose to develop an early to middle Miocene (20-13 Ma) astronomically-calibrated benthic isotope chronostratigraphy in a „mega-splice“ constructed from sedimentary successions drilled across the Pacific equatorial age transect (PEAT) during IODP Expedition 320/321. We will especially focus on the enigmatic 16-20 Ma interval, which is not yet firmly anchored within the geological timescale and still requires major clarification. The PEAT Expedition 320/321 provided for the first time the opportunity to recover this time slice in one of the most climate sensitive regions of the world, where calcareous sediments have been preserved best. Our work will contribute to improving the Cenozoic timescale, and will supply an essential chronological framework for future studies of Miocene climate, paleoceanography and evolutionary patterns. Our stable isotope records will also provide important information about ice volume fluctuations, Pacific deep-water characteristics and re-organizations in deep-water circulation associated with major climatic events (including the Miocene Climatic Optimum and Mi-1-3 glaciations). Ultimately, we will integrate our research with other postcruise studies to comprehensively explore the relationships between equatorial Pacific paleoproductivity, carbon isotope signals and the carbon cycle.

我们建议开发早中新世中期（20-13马）天文校准的底栖同位素年代地层学的“巨型拼接”从沉积序列钻跨太平洋赤道年龄样带（PEAT）在IODP远征320/321。我们将特别关注神秘的16-20 Ma间隔，该间隔尚未牢固地固定在地质时间尺度内，仍然需要进行重大澄清。PEAT Expedition 320/321首次提供了在世界上最气候敏感的地区之一恢复这段时间的机会，那里的钙质沉积物保存得最好。我们的工作将有助于完善新生代的时间尺度，并将提供一个必要的年代框架，为未来的研究中新世气候，古海洋和演化模式。我们的稳定同位素记录还将提供有关冰量波动、太平洋深水特征和与重大气候事件（包括中新世气候适宜期和Mi-1-3冰川）有关的深水环流重组的重要信息。最终，我们将把我们的研究与其他巡航后研究相结合，全面探讨赤道太平洋古生产力，碳同位素信号和碳循环之间的关系。