The Campanian and Paleogene ("Greenhouse") Arctic Ocean paleoenvironment: Implications from organic-carbon and biomarker records (ACEX-IODP Leg 302)

坎帕尼亚和古近纪（“温室”）北冰洋古环境：有机碳和生物标志物记录的影响（ACEX-IODP Leg 302）

• 批准号: 13164485
• 负责人: Professor Dr. Rüdiger Stein
• 金额: --
• 依托单位: Zentrum für Marine Umweltwissenschaften (MARUM)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/13164485?language=en
• 关键词: Campanian; Paleogene; Greenhouse; Arctic; Ocean

The 200m thick sequence of Campanian, late Paleocene and middle-early Eocene age, recovered during IODP Expedition 302 (Arctic Coring Expedition - ACEX) on Lomonosov Ridge, are characterized by high organic-carbon contents of about 1 to 6%. Our organicgeochemical study of these unique sediments focuses on the organic-carbon cycle and its relationship to the long- and short-term paleoenvironmental/paleoceanographic evolution during this time interval. Here, euxinic conditions and terrigenous input are the most important processes controlling organic-carbon deposition, as shown in our ongoing study. In the remaining time of our project, the reconstruction of sea-surface temperature changes during middle Eocene times (50 to 44 Ma) using alkenones, and its correlation with the history of Arctic ice-rafting as well as the global temperature curve, will be of special interest. Furthermore, changes in anoxia, freshwater discharge, productivity, and terrigenous input across major extreme climate events identified in the ACEX record, such as the Paleocene/Eocene Temperature Maximum (PETM) Event, the Elmo Event, and the Azolla Event, will be a major focus of our detailed biomarker studies. Applied methods concentrate on biomarker analyses using GC and GC/MS techniques, and stable carbon (and hydrogen) isotopes of specific biomarkers.

在IODP Expedition 302（Lomonosov Ridge上的IODP Expedition 302（北极加油远征））中恢复了200m厚的Campanian，晚古新世和中年始新世时代，其特征是高的有机碳含量约为1％至6％。我们对这些独特沉积物的有机地球化学研究集中于有机碳循环及其与此时间间隔内的长期和短期古环境/古环境演化的关系。在这里，在我们正在进行的研究中表明的那样，在控制有机碳沉积的最重要的过程中，Euxinic条件和陆源输入是控制有机碳沉积的最重要过程。在我们项目的剩余时间里，使用烷烃在始新世中期（50至44 mA）期间的海面温度的重建以及其与北极冰造的历史以及全球温度曲线的相关性将特别感兴趣。此外，在ACEX记录中确定的重大极端气候事件中的缺氧，淡水排放，生产力和陆源输入的变化，例如古新世/始新世温度最高（PETM）事件，Elmo事件和Azolla事件，将成为我们详细生物标志物研究的重点。应用的方法将使用GC和GC/MS技术以及特定生物标志物的稳定碳（和氢）同位素集中在生物标志物分析上。