Discovery and implication of shock metamorphic unloading microfractures in Devonian bedrock of Taihu Lake |
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| Authors: | Erkang Wang Yuqiu Wan and Shijin Xu |
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| Institution: | 1. Department of Earth Sciences, Nanjing University, Nanjing 210093, China;
2. Department of Environmental Sciences, Nanjing University, Nanjing 210093, China |
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| Abstract: | Sphenoidal tensile microfractures with particular patterns have been discovered in the Late Devonian quartzose sandstone in islands and peninsula of the Taihu Lake area. Microfractures present a '人'-shape collective pattern, occurring in a single row or multiple rows. The quartz crystals in the inner acute angle area of some '人'-shape microfractures have severely been non-crystallized, showing the feature of diaplectic glass. The studies show that these special microfractures were formed during the unloading process after the compression was up to the peak of an impact event. |
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| Keywords: | shock metamorphism unloading microfracture Taihu Lake |
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