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Long term structural development and landscape evolution of eastern Dronning Maud Land, and implications for the geological evolution of the Weddell Sea region

东宁莫德地的长期结构发展和景观演化，以及对威德尔海地区地质演化的影响

基本信息

批准号：
200179592
负责人：
Professor Dr. Frank Lisker
金额：
--
依托单位：
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/200179592?language=en
关键词：
Long term structural development landscape

项目摘要

This proposal applies for the funding of fieldwork in Sør Rondane/ eastern Dronning Maud Land (DML) during the expedition “GEA II” in 2011/12, and subsequent isototpe-geochemical and thermochronological research. Sør Rondane is located at a key position where the still unknown suture between East and West Gondwana is presumed to pass through DML. It also occupies a crucial position at the Karoo-Maud Plume between Antarctica, Africa/ Madagascar and India/ Sri Lanka, and therefore represents a key locus for our understanding of the Gondwana breakup history, the opening of the South Atlantic Ocean, and the establishment of the present plate configuration. Structural mapping, isotope geochemistry and geochronology (U-Pb SHRIMP and LA-ICP-MS, Ar-Ar) will be used to gain a better knowledge on the geodynamic evolution of the basement rocks and to detect the position of the E-W-Gondwana suture. Thermochronological methods (fission track/ FT and (U-Th-Sm)/He) and structural analyses of brittle fault zones will be applied to investigate the Phanerozoic shallow crustal dynamics of eastern DML. The regional paleo-isotherm pattern will provide constraints on the geological/ paleogeographic setting of DML within Gondwana, the Gondwana breakup history and regional passive margin evolution, and the long-term landscape and climate evolution of DML within the Antarctic continent. Moreover, the subglacial geology will be investigated by an aerogeophysical survey in combination with ground-geophysical studies in order to trace rock units and tectonic structures on a regional scale.

该提案适用于资助2011/12年“全球环境评估二号”考察期间在南罗纳河谷/东德龙宁毛德地进行的实地考察，以及随后的同位素地球化学和热年代学研究。Sør Ronnesi位于一个关键位置，东冈瓦纳和西冈瓦纳之间仍然未知的缝合线被认为穿过DML。它还占据了南极洲，非洲/马达加斯加和印度/斯里兰卡之间的卡鲁-莫德羽的关键位置，因此代表了我们理解冈瓦纳大陆解体历史，南大西洋开放和建立当前板块配置的关键轨迹。将利用结构制图、同位素地球化学和地质年代学（U-Pb SHRIMP和LA-ICP-MS、Ar-Ar）更好地了解基底岩石的地球动力学演化，并探测东西冈瓦纳缝合带的位置。利用裂变径迹/ FT和（U-Th-Sm）/He等热年代学方法和脆性断裂带的构造分析，研究了东喜马拉雅地区中生代浅部地壳动力学。该区域古等温线格局将对冈瓦纳大陆内部的地质/古地理背景、冈瓦纳大陆的解体历史和区域被动边缘演化以及南极大陆内部的长期景观和气候演化提供制约。此外，还将结合地面地球物理研究进行航空地球物理调查，对冰下地质进行调查，以便在区域范围内追踪岩石单位和构造结构。