Abstract Minerals on fault surfaces record fluid-rock interaction, strain, and/or heat during fault slip. Fault-hosted hematite is amenable to (U–Th)/He (He) thermochronometry. Hematite He dates reflect fault-related processes or exhumation, depending on hematite growth above or below the grain-size controlled closure temperature and processes that promote open system behavior. Deconvolving these phenomena requires multi-scale hematite textural characterization and constraints on the ambient thermal history from conventional thermochronometry. Two examples of this approach include investigations of hematite-coated fault surfaces from exhumed damage zones in the seismically active Wasatch fault zone (WFZ), UT, and Painted Canyon fault (PCF) paralleling the southern San Andreas fault, Mecca Hills, CA. WFZ fault mirrors preserve sub-μm-scale polygonal grain textures and hematite He data patterns that, together with host-rock apatite He data, are consistent with localized friction-generated heat, hematite He loss, and hematite recrystallization during damage zone seismicity

中文翻译：

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赤铁矿断层岩石测温仪和纹理为断层带过程提供信息

摘要断层表面上的矿物记录了断层滑动过程中的流体-岩石相互作用、应变和/或热量。断层承载的赤铁矿适用于 (U–Th)/He (He) 热计时法。赤铁矿 He 日期反映了断层相关过程或折返过程，这取决于赤铁矿在晶粒尺寸控制的闭合温度之上或之下的生长以及促进开放系统行为的过程。解卷积这些现象需要多尺度赤铁矿结构特征和对来自传统热计时法的环境热历史的限制。这种方法的两个例子包括对地震活跃的瓦萨奇断层带 (WFZ)、UT 和与南圣安德烈亚斯断层平行的彩绘峡谷断层 (PCF) 中挖掘出的损坏带的赤铁矿涂层断层表面的调查，该断层与加利福尼亚州麦加山。