제목: Paleogeographic Significance of Late Paleozoic Glacial Deposits in Northern Victoria Land, Antarctica

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​​​​​​​​​​​​​​​​​​연사: 우주선 교수 (서울대학교)​​​​​​​​​​

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장소: 과학관 B101호​​

Abstract:

The Earth has experienced numerous ice ages throughout its history. The Late Paleozoic Ice Age (LPIA) is recognized as the first of these to occur after the Earth developed its current elemental cycling system. Gondwana, including Antarctica, was located in the Southern Hemisphere. The existence of an ice sheet or ice patches has been inferred from the glacial deposits formed by this glaciation. Changes in the distribution and extent of the LPIA deposits are regarded as a proxy for the waxing and waning of the Southern Hemisphere ice sheets, which are understood to be one of the main engines driving environmental changes in the late Paleozoic. The LPIA deposit in the Northern Victoria Land (NVL), Antarctica, occurs in the lower part of the Beacon Supergroup and is characterized by diamictites and dropstone-bearing facies in association with fluvio-lacustrine facies. The Lanterman and Neall Massif tillites are the northernmost LPIA deposits of Antarctica. They are important because of their location midway between the Transantarctic Mountains and Australia, both of which contain major glacially influenced sedimentary basins. Recent detailed sedimentological and stratigraphical investigations on the tillites of NVL revealed that they were formed in glacio-lacustrine and fluvial environments, with sediments derived from the south. This southern provenance suggests the presence of a geographical high dividing NVL from Transantarctic Mountains. This further suggests that the NVL LPIA basin was linked to those of Tasmania and Australia, which were located to the north of NVL at that time. Detailed research on the NVL LPIA deposit will provide fundamental data for an integrated understanding of environmental changes in the Antarctica-Australia transition zone.