Quaternary History of Argentine Patagonia and Tierra del Feugo: Establishment of an Absolute Age-Controlled Glacial Chronology for the Southern Andes

阿根廷巴塔哥尼亚和火地岛的第四纪历史：建立安第斯山脉南部绝对年龄控制的冰川年代学

• 批准号: 8716344
• 负责人: Edward Evenson
• 金额: $ 9.07万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-06-01 至 1992-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8716344&HistoricalAwards=false
• 关键词: Quaternary; History; Argentine; Patagonia; Tierra

This research project will complete current U.S. Argentine research in Patagonia and expand to include related research in Tierra del Fuego. Mapping of the oldest surficial drift deposits will be completed in Patagonia. The new research in Tierra del Fuego includes mapping, dating and correlating pre-to-late glacial and raised shorelines between Rio Gallegos and Rio San Pablo using K-Ar and Amino Acid Racemization dating methods. The area contains a large region of "questionable glaciation" to be studied because of its importance as a potential refuge during glacial times. The investigation of raised shorelines will provide important information on the isostatic and neotectonic history of Tierra del Fuego. The investigators are rapidly developing an absolute, age controlled glacial history for this area which strongly supports the work of Mercer and his co-workers (1976, 1983). The Southern Andes represent the ideal locality to reconstruct the timing and magnitude of past glacial and climatic fluctuations.

该研究项目将完成目前美国在巴塔哥尼亚的阿根廷研究，并扩展到火地岛的相关研究。巴塔哥尼亚将完成最古老的地表漂移矿床的测绘。在火地岛的新研究包括用K-Ar和氨基酸外消旋化测年方法对加莱戈斯岛和圣巴勃罗岛之间的前至晚冰期和隆起的海岸线进行制图、测年和对比。该地区有一大片“可疑的冰川作用”有待研究，因为它在冰川时期作为潜在避难所的重要性。对凸起海岸线的调查将为火地岛的均衡史和新构造史提供重要信息。研究人员正在迅速发展一个绝对的、年龄控制的这个地区的冰川历史，这有力地支持了默瑟和他的同事的工作（1976年，1983年）。南安第斯山脉代表了重建过去冰川和气候波动的时间和规模的理想地点。