【摘 要】
：
The stockwork microbreccia found in the Dabie and Helan Mountains bears no relation to either meteorite impact and cryptoexplosion, or fault displacement. It is
【机 构】
：
Institute of Geology,Institute of Geomechanics
【基金项目】
：
国家重点基础研究发展计划(973计划);国家自然科学基金
论文部分内容阅读
The stockwork microbreccia found in the Dabie and Helan Mountains bears no relation to either meteorite impact and cryptoexplosion, or fault displacement. It is controlled by tensional or transtensional fracture network in relatively hard felsic crystalline rocks, appearing as breccia with dark cryptocrystalline matrix. The kilometer-scale distribution and complicated relation to fracture system of the stockwork microbreccias, randomly distributed autochthonous fragments of host rock, ultracataclasis without notable displacement in the cryptocrystalline matrix, and a probable solid-state amorphization deformation mechanism all suggest that large-scale, high-energy and rapid brittle fracturing event might have occurred in the rocks at relatively deep crustal level in the areas.
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