COLLABORATIVE RESEARCH: Indo-Asian Tectonics; Significance of Neogene Uplift Events

合作研究：印度-亚洲构造；

• 批准号: 9118827
• 负责人: Peter Copeland
• 金额: $ 2.2万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-01 至 1995-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118827&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Indo; Asian; Tectonics

Several contrasting models exist for the tectonic development of the Himalayan and Tibetan Plateau. Each of these models predicts different times for the initiation of crustal thickening, differences in the rate or thickening, and different times for attainment of present crustal thickness. However, none of the existing models predicts the inferred denudation event at 25 to 20 Ma. This study will test the models and determine how widespread was the denudation, using structural mapping and 40Ar/39Ar thermochronology along the Gangdese belt, and in the Yadong-Gulu rift. The thermochronology will also be combined with magneto- stratigraphy on existing samples in order to fully test the models. The results will provide a significant contribution to under- standing the tectonics of collisional and crustal thickening processes.

对于喜马拉雅和青藏高原的构造发展，存在几种截然不同的模式。这些模型中的每一个都预测了不同的地壳增厚开始时间、增厚速度或增厚速度的差异以及达到现今地壳厚度的不同时间。然而，现有的模型都没有预测到25~20 Ma的剥蚀事件。这项研究将检验这些模型，并利用冈底斯带和亚东-古鲁裂谷的构造作图和40Ar/39Ar热年代学来确定剥蚀的范围有多广。热年代学还将与现有样品的磁性地层学相结合，以全面测试这些模型。这一结果将对了解碰撞和地壳增厚过程的构造作出重大贡献。