Discovery and implication of shock metamorphic unloading microfractures in Devonian bedrock of Taihu Lake

作     者：王尔康 万玉秋 徐士进 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2002年第45卷第5期

页      面：459-467页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：This work was supported by the National Natural Sc ence Foundation of China (Grant No.469672101) 

主　　题：shock metamorphism, unloading, microfracture, Taihu Lake. 

摘      要：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 ‘?’-shape collective pattern, occurring in a single row or multiple rows. The quartz crystals in the inner acute angle area of some ‘?’-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.