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Integrated rock magnetic, paleomagnetic and geochemical studies of overpressured sediments from the Gulf of Mexico, Brazos-Trinity #4 and Ursa Basin, IODP Leg 308

对墨西哥湾布拉索斯-三一地区超压沉积物进行综合岩石磁性、古地磁和地球化学研究

基本信息

批准号：
28833368
负责人：
Professor Dr. Tilo von Dobeneck
金额：
--
依托单位：
Fachgebiet Marine Geophysik
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2008-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/28833368?language=en
关键词：
Integrated rock magnetic paleomagnetic geochemical

项目摘要

During IODP Leg 308 ( Overpressure and Fluid Flow Processes in the Deepwater Gulf of Mexico: Slope Stability, Seeps and Shallow Water Flow ) four late Quaternary sediment series were recovered in the Brazos-Trinity #4 minibasin and in the Ursa region of the northern Gulf of Mexico to test multidimensional flow models and deformation processes in passive margin settings. In this project, we plan to combine available and new rock magnetic and geochemical data to examine low-permeability mudstones overlying overpressured aquifers to track fluid flow pathways and precipitation horizons related to changes in the sedimentary milieu. We also use rock magnetic proxies to describe variations in continental input (iron oxides) and the stage of early diagenetic alteration (iron sulfides). Magnetite and greigite have been identified by pilot rock magnetic and SEM studies. To understand the time frame of such processes, we will refine the preliminary bio- and magnetostratigraphic Brazos-Trinity age model and link it to the Ursa drill sites using rock magnetic, physical property and color data for cyclostratigraphic correlation. This research concept is planned to be carried out by Christine Franke in continuation and consequential scientific exploitation of her shipboard work.

在IODP腿308（超压和流体流动过程在深水墨西哥湾：斜坡稳定性，渗漏和浅水流）四晚第四纪沉积物系列恢复在巴西-三一#4小盆地和Ursa地区的北方墨西哥湾测试多维流动模型和变形过程中被动边缘设置。在本项目中，我们计划将联合收割机现有的和新的岩石磁性和地球化学数据结合起来，检查覆盖在超压含水层上的低渗透性泥岩，以跟踪与沉积环境变化相关的流体流动路径和降水层位。我们还使用岩石磁性代用指标来描述大陆输入（铁氧化物）和早期成岩蚀变（铁硫化物）阶段的变化。磁铁矿和云英岩已被鉴定的试点岩石磁性和扫描电镜研究。为了了解这些过程的时间框架，我们将完善初步的生物和磁性地层学Brazos-Trinity年龄模型，并使用岩石磁性，物理性质和颜色数据将其与Ursa钻探地点联系起来，以进行循环地层对比。这一研究概念计划由克莉丝汀弗兰克继续进行，并对她的船上工作进行相应的科学利用。