报告题目：Tectonic and paleoenvironmental evolution of deep-time Antarctica: from sedimentary records of northern Victoria Land
报告人：Jusun Woo, Assistant Professor
报告人单位：Seoul National University
报告时间：7月22日（周一）下午2:30-3:30
报告地点：图书馆三楼报告厅
主办：重点实验室、科技处、人教处
报告简介：
Sedimentary strata in northern Victoria Land (nVL), Antarctica contain evidences of Antarctica’s deep-time environments ranging from Cambrian to Jurassic in geological age. The lower Paleozoic Bowers Supergroup consists of low-grade metasedimentary rocks including siliciclastics, carbonates, and volcanics. The basal part of the supergroup is characterized by volcanic rocks and deep-marine turbidites and the overlying sedimentary facies successions suggest a major regression from continental slope, shallow marine to fluvial environments. Rare carbonate rocks occur as olistoliths in the deep-water sediments and preserve microbial reef textures which provide hints to understand unpreserved Cambrian carbonate platforms in the Antarctica. These sediments were deposited in the basin evolved along with the early Paleozoic tectonic processes of the Ross Orogeny. The overlying, late Paleozoic to Jurassic Beacon Supergroup is characterized by thick succession of sandstones and conglomerates with fluvial origin. The basal part of the supergroup is characterized by diamictites formed in glacio-lacustrine-fluvial environments which prevailed in southern part of the Gondwana Land in the late Paleozoic. The upper part of the supergroup contains volcaniclastics and is eventually overlain by Jurassic Ferrar Group. The Ferrar Group in nVL consists of effusive and eruptive tholeiitic volcanics which formed thick succession of lava flow units with thin volcaniclastic interbeds and dyke-and-sill systems. These volcanics are formed mostly by continental flood basalt related to the rifting in the early stage of the breakup of the Gondwana.
The sedimentary rocks of nVL record succession of geological events in the Antarctica such as formation of Antarctic continent in the early Paleozoic time and break-up of Gondwana Land in the Jurassic. The rocks also provide new data set for integrate understanding of past global environmental events such as Cambrian microbial reef evolution and development of late Paleozoic ice age. There is still a lot more interesting geology to come in the Antarctica.
报告人简介：
Jusun Woo助理教授于2009年从首尔大学获得博士学位，随后在Korea Polar Research Institute 担任Senior Research Scientist，从2019年至今在首尔大学担任助理教授职位。研究兴趣主要包括华北、黄海、格陵兰岛和南极洲内相关沉积盆地的地层学和沉积学工作。
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