Silica gel formation during fault slip: Evidence from the rock record
摘要：
Dynamic reduction of fault strength is a key process during earthquake rupture. Many mechanisms for causing coseismic weakening have been proposed based on theory and laboratory experiments, including silica gel lubrication. However, few have been observed in nature. Here we report on the first documented occurrence of a natural silica gel coating a fault surface. The Corona Heights fault slickenside in San Francisco, California, is covered by a shiny layer of translucent silica. Microstructures in this layer show flow banding, armored clasts, and extreme comminution compared to adjacent cataclasites. The layer is composed of similar to 100 nm to 1 mu m grains of quartz, hydrous crystalline silica, and amorphous silica, with 10-100 nm inclusions of Fe oxides and ellipsoidal silica colloids. Kinematic indicators and mixing with adjacent cataclasites suggest the shiny layer was fluid during fault slip. The layer therefore represents a relict silica gel that formed during fault motion, and which could have resulted in frictional instability. These observations confirm that the silica gels formed in rock friction experiments do occur in natural faults and therefore that silica gel formation can act as a dynamic weakening mechanism in faults at shallow crustal conditions.
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关键词：
SUBDUCTION THRUST SEISMOGENIC DEPTHS SEISMIC CYCLE DEFORMATION LUBRICATION QUARTZ FLOW EARTHQUAKES PRESSURE FRICTION
DOI：
10.1130/G34483.1
被引量：
年份：
2013
国家科技图书文献中心
(权威机构)
掌桥科研
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