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Collaborative Research: Probing the Thermal Evolution of the San Andreas fault at Parkfield: Thermochronology in the San Andreas Fault Observatory at Depth (SAFOD)

合作研究：探索帕克菲尔德圣安德烈亚斯断层的热演化：圣安德烈亚斯断层深度观测站 (SAFOD) 的热年代学

基本信息

批准号：
0345900
负责人：
Kenneth Farley
金额：
$ 3万
依托单位：
California Institute of Technology
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：
2004-04-01 至 2007-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0345900&HistoricalAwards=false
关键词：
Collaborative Research Probing Thermal Evolution

项目摘要

Analysis of rock samples from the 4-km-deep San Andreas Fault zone Observatory at Depth (SAFOD) drillhole provides an excellent opportunity to explore a fundamental question in fault mechanics regarding the frictional strength of faults, while simulataneously extending our knowledge of the regional uplift history in the Parkfield, California, area. SAFOD will provide samples through the Salinian block and from near at least one abandoned segment of the San Andreas fault system before finally intersecting the active San Andreas fault strand(s). Building on previous analysis of Pilot Hole samples collected in 2002, deep Salinian samples, as well as samples adjacent to the abandoned and active fault segments are analyzed using low temperature thermochronometry (specifically apatite and zircon fission-track dating, (U-Th)/He dating of apatite and zircon crystals, and 39Ar-40Ar dating of K-feldspar grains). The thermochronometry and complementary modeling studies characterize the long-term thermal evolution of the region and probe the faults themselves for evidence of localized thermal perturbations. Constraining frictional heating using thermochronometry presents an independent approach that can help establish the frictional properties of the San Andreas fault.

对4公里深的圣安德烈亚斯断裂带深度观测台（SAFOD）钻孔的岩石样本进行分析，为探索断层力学中有关断层摩擦强度的基本问题提供了一个极好的机会，同时扩展了我们对加州帕克菲尔德地区区域隆起历史的了解。在最终与活跃的圣安地列斯断层链相交之前，SAFOD将通过Salinian块和至少一个废弃的圣安地列斯断层系统附近提供样本。在2002年对Pilot Hole样品进行分析的基础上，利用低温热测年法（特别是磷灰石和锆石裂变径迹测年、磷灰石和锆石晶体的(U-Th)/He测年、钾长石颗粒的39Ar-40Ar测年）对深盐系样品以及废弃断裂段和活动断裂段附近的样品进行了分析。热时计和补充模拟研究表征了该地区的长期热演化，并探测断层本身以寻找局部热扰动的证据。使用热时计来限制摩擦加热提供了一种独立的方法，可以帮助建立圣安德烈亚斯断层的摩擦特性。