Collaborative Research: Thermochronometry and Evolution of the Taiwan Fold and Thrust Belt

合作研究：台湾褶皱冲断带的测温与演化

• 批准号: 0337455
• 负责人: Donald Fisher
• 金额: $ 7.61万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-15 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0337455&HistoricalAwards=false
• 关键词: Collaborative; Research; Thermochronometry; Evolution; Taiwan

This project is directed at the processes of active mountain-building in Taiwan. As a region of young tectonic activity, Taiwan exhibits high rates of deformation, uplift and erosion. These high rates are advantageous to studies of deformation associated with the mountain-building process. This study is focused on the fold-and-thrust belt of western Taiwan where crustal material from the Asian plate is incorporated into the Taiwan orogen. The investigators are using apatite fission track dating and U-Th/He dating of apatite to determine low-temperature cooling rates of rock throughout the fold-and-thrust belt. Geologic mapping provides structural context for the dating, permitting dating of exhumation of individual thrust sheets. The cooling is related to the rates timing of fault motion and provides information on the kinematic pattern of crustal deformation. To quantify this pattern, the investigators are using structural reconstruction software combined with thermal modeling to relate cooling data, fault motion and temperature history. The use of commercial software with thermal modeling, calibrated to low temperature thermochronomety represents a new innovation in thrust belt interpretation.

该项目针对台湾积极的造山过程。作为一个年轻的构造活动地区，台湾表现出高变形、隆起和侵蚀率。这些高速率有利于研究与造山过程相关的变形。这项研究的重点是台湾西部的褶皱逆冲带，亚洲板块的地壳物质在此融入台湾造山带。研究人员正在使用磷灰石裂变径迹测年和磷灰石 U-Th/He 测年来确定整个褶皱冲断带岩石的低温冷却速率。地质测绘为测年提供了结构背景，从而可以对各个逆冲层的掘出物进行测年。冷却与断层运动的速率时间有关，并提供有关地壳变形运动模式的信息。为了量化这种模式，研究人员正在使用结构重建软件与热建模相结合，将冷却数据、断层运动和温度历史联系起来。使用商业软件进行热建模，并根据低温热时计进行校准，代表了逆冲带解释的一项新创新。