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.

在罗蒙诺索夫海岭的IODP 302（北极取芯考察- ACEX）期间恢复的200 m厚的Campanian、古新世晚期和始新世中-早期层序的特征是有机碳含量高，约为1 - 6%。我们对这些独特沉积物的有机地球化学研究侧重于有机碳循环及其与这一时期的长期和短期古环境/古海洋学演变的关系。在这里，缺氧条件和陆源输入是控制有机碳沉积的最重要的过程，如我们正在进行的研究所示。在我们项目的剩余时间里，使用烯酮重建中始新世时期（50至44 Ma）的海面温度变化，及其与北极冰筏漂流历史以及全球温度曲线的相关性，将是特别感兴趣的。此外，缺氧，淡水排放，生产力和陆源输入的变化，在ACEX记录中确定的主要极端气候事件，如古新世/始新世最高温度（PETM）事件，埃尔莫事件，红萍事件，将是我们详细的生物标志物研究的主要重点。应用的方法集中于使用GC和GC/MS技术的生物标志物分析，以及特定生物标志物的稳定碳（和氢）同位素。