Quantifying the bulk mineralogy of Arctic Ocean sediments of the last 80 Ma: Terrigenous sediment transport, climate and sediment deposition characteristics

量化过去 80 Ma 北冰洋沉积物的总体矿物学：陆源沉积物输送、气候和沉积物沉积特征

• 批准号: 13330149
• 负责人: Professor Dr. Reinhard X. Fischer
• 金额: --
• 依托单位: Fachgebiet Kristallographie und Geomaterialforschung
• 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 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/13330149?language=en
• 关键词: Quantifying; bulk; mineralogy; Arctic; Ocean

This project continues to aim on the full quantitative phase analysis (QPA) of Cretaceous to Quaternary sediments of the central Arctic Ocean (AO). As indicated by the extensive use of the X-ray diffraction data for the determination of lithologica! units of the IODP Leg 302-Arctic Coring Expedition (ACEX) cores it is an important part of the internationally coordinated investigation of the cored Quaternary to Cretaceous sediments. Currently, 230 powdered samples are investigated with Xray diffraction revealing the sedimentation and early diagenetic history of the ACEX cores. The second year of this research project aims on a higher resolution sampling of the most relevant sediment sequences. Initial stratigraphic results of the ACEX cores assume a continuous sedimentation from about 15-16 Mill, years ago (middle Miocene) to today. This provides for the first time the change to resolve the increasing glaciations of the Northern Hemisphere in unprecedented detail in a record from about 88° N. The mineralogical fingerprints of the potential glaciated regions are well known. As a result, sediment transport by sea ice and/ or icebergs are reconstructable and the early glaciation history can be cleared. The mineral assemblage has strongly changed between the late Cretaceous/ Early Tertiary Greenhouse and the middle Tertiary Icehouse sediment sequences. Here, we will try to decipher if only tectonic reasons (separation and drowning of the Lomonosov Ridge slide) or additionally source region change have been the reason.

该项目继续致力于北冰洋中部白垩纪至第四纪沉积物的全定量相分析。X射线衍射数据在岩性测定中的广泛应用说明了这一点。IODP LEG 302-北极取心考察(ACEX)岩心的单位它是第四纪至白垩纪取心沉积物国际协调调查的重要组成部分。目前，对230个粉状样品进行了X射线衍射研究，揭示了ACEX岩芯的沉积和早期成岩历史。该研究项目的第二年旨在对最相关的沉积物序列进行更高分辨率的采样。ACEX岩心的初步地层学结果认为，从大约15-16 Mill(中新世中期)到今天，ACEX岩芯是连续沉积的。这是第一次在约88°N的记录中以前所未有的详细程度解决北半球日益增长的冰川的变化。潜在冰川区的矿物学指纹是众所周知的。因此，海冰和/或冰山的沉积物输运是可重建的，早期冰川历史可以被清除。晚白垩世-早第三纪温室和中第三系冰库沉积序列之间的矿物组合发生了强烈的变化。在这里，我们将试图破译是否只有构造原因(洛蒙诺索夫山脊滑移的分离和淹没)或另外的源区变化是原因。