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2011/2012年“GEA II”探险期间南龙丹/东莫德地（DML）的实地考察以及随后的同位素地球化学和热年代学研究的资助。南龙丹位于该地区的关键位置。东冈瓦纳大陆和西冈瓦纳大陆之间仍然未知的缝合线被认为穿过DML，它在卡鲁-莫德羽流之间也占据着重要地位。南极洲、非洲/马达加斯加和印度/斯里兰卡，因此是我们了解冈瓦纳大陆分裂历史、南大西洋开放以及建立当前板块构造、同位素地球化学和地质年代学的关键地点。（U-Pb SHRIMP 和 LA-ICP-MS、Ar-Ar）将用于更好地了解基岩的地球动力学演化并探测东-西-冈瓦纳缝合带。热年代学方法（裂变径迹/ FT 和（U-Th-Sm）/He）和脆性断裂带的结构分析将用于研究东部 DML 的显生宙浅地壳动力学区域古等温线模式。将对冈瓦纳大陆 DML 的地质/古地理环境、冈瓦纳大陆裂解历史和区域被动边缘演化以及长期景观和气候提供约束此外，还将通过航空地球物理调查结合地面地球物理研究来研究冰下地质，以便在区域尺度上追踪岩石单元和构造结构。