Global Eustasy or Tectonic Subsidence? Investigating Controls on Basin Evolution During Cenozoic Plate Reorganization, Magallanes Basin, Patagonia

全球稳定还是构造沉降？

基本信息

批准号：
1649585
负责人：
Julie Fosdick
金额：
$ 23.16万
依托单位：
University of Connecticut
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-06-15 至 2020-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1649585&HistoricalAwards=false
关键词：
Global Eustasy Tectonic Subsidence Investigating

项目摘要

Tectonic activity and climate interact to control the growth of mountains, erosion of steepened topography, and fluctuations between marine and terrestrial conditions along low-lying continental margins. Continents located in complex tectonic plate settings undergoing continental separation are especially sensitive to changes in tectonic deformation and sea level, which together modulate biogeographic pathways between major landmasses and global ocean/atmosphere circulation between ocean basins. This project uses stratigraphy, geochronology, basin modeling, structural geology, and paleobiology in the Cenozoic Magallanes-Austral region of South America (Chile and Argentina) to investigate how tectonic deformation, sea level, and climate affect coastal depositional patterns and paleogeography during an important time interval for global climate. The project advances the role of science in our society by 1) engaging the general public and college students enrolled in general education courses by developing a field-based learning module on plate tectonics, global climate, and paleogeography, 2) promoting increased participation of women in science and technology, 3) supporting international research and training opportunities for graduate and undergraduate students, and 4) stimulating new international collaborations between U.S. and Chilean academic institutions and regional parkland organizations. The NSF Office of International Science and Engineering is providing support for international activities associated with this project. The primary research objective of this project is to evaluate the controlling factors on marine transgressions and continental sediment dispersal patterns in the Magallanes-Austral region of South America during an important time interval for global climate. This work aims to test the hypothesis that the middle Cenozoic Atlantic transgressions in Patagonia were caused by tectonic loading and deepening of sedimentary environments during Andean deformation and opening of the Drake Passage. This project also investigates how the intercalated coarse-grained progradational deposits are linked to thrusting history and physiographic changes in upland sediment source areas. Stratigraphy, basin modeling, structural mapping, and sedimentary provenance tools (detrital zircon geochronology, sandstone petrography, and mudstone geochemistry) will be combined to evaluate how tectonic and climatic changes in upland source areas affect sedimentation style, grain size, accumulation rate, and basin paleogeography during Eocene through middle Miocene time. Erosion rates derived from detrital apatite thermochronology will further resolve potential influences from thrust-belt deformation and climatic events. This project promotes scientific progress on understanding the deformation of the continental lithosphere by: 1) evaluating along-strike differences in retroarc foreland basin evolution during a major phase of Andean orogenesis, 2) contributing an improved chronostratigraphic framework for the diverse middle Cenozoic Patagonian fossil assemblages, 3) investigating relationships between orogenic paleogeography, transgressions, sediment pulses, and biotic events, and 4) integrating new datasets for improved numerical models of lithospheric deformation and climatic processes in orogenic systems.

构造活动和气候相互作用，以控制山脉的生长，陡峭的地形侵蚀以及沿低洼大陆边缘的海洋和陆地条件之间的波动。大陆分离的复杂构造板环境中的大陆对构造变形和海平面的变化特别敏感，这共同调节了主要陆地之间的生物地理途径以及海洋盆地之间的全球海洋/大气循环。该项目使用南美的新生代Magallanes-austral地区（智利和阿根廷）中使用地层，地球学，盆地建模，结构地质学和古生物学，以调查构造变形，海平面和气候如何影响沿海沿海沉积模式和整体时间间隔期间重要的时间间隔。该项目通过1）通过开发一个基于现场的学习模块，在板块构造，全球气候和古地理学的基于现场的学习模块中参与普通教育课程的参与，以提高科学在我们的社会中的作用。 NSF国际科学与工程办公室正在为与该项目相关的国际活动提供支持。该项目的主要研究目标是在全球气候的重要时间间隔内评估南美Magallanes-Austral地区的海洋侵犯和大陆沉积物分散模式的控制因素。这项工作旨在检验以下假设：巴塔哥尼亚的新生代大西洋违法行为是由安第斯变形和开放drake通道期间沉积环境加深的构造负荷引起的。该项目还调查了插入的粗粒序矿床如何与高地沉积物源区域的投入历史和生理变化有关。将合并地层学，盆地建模，结构图和沉积出处工具（碎屑锆石，砂岩岩石学和泥岩地球化学），以评估高地源区域的构造和气候变化如何影响沉积物，谷物尺寸，积累率，堆积率以及盆地古地球地球地球地球元素在欧洲元中循环中的时代循环。从碎屑磷灰石热量学得出的侵蚀速率将进一步解决潜在的影响皮带变形和气候事件的影响。该项目促进了科学进步在理解大陆岩石圈的变形方面，通过：1）评估在安第斯造成造成的主要阶段的retroarc前盆地盆地进化中沿撞strike差异，2）2）促进了改进的年度地层学框架，以改善了多样化的中间病毒的papagonian patagonian postrandion systography，3）脉冲和生物事件，以及4）整合新数据集，以改善造型系统中岩石圈变形和气候过程的数值模型。