东昆仑五龙沟金矿矿集区韧性剪切带构造变形特点研究
A study of the deformation characteristics of the ductile shear zone in the Wulonggou gold ore concentration area, East Kunlun，Qinghai
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摘要: 提要：野外构造解析和显微构造分析表明，五龙沟地区经历了长期构造演化，具有多层次多期构造作用产物叠生特点。可分为早印支期（240 Ma左右）及其以前的韧性变形；晚印支—早燕山期的（235~197 Ma）的脆韧性变形；晚燕山期以来，尤其早-中喜马拉雅期（51~21 Ma）的脆性变形。晚印支期—早燕山期的脆-韧性变形，与造山隆升相伴，表现为先存变质核杂岩构造北东翼构造岩类的褶皱、断裂，奠定了五龙沟地区北西西向的构造主线，即形式上的数条北西西向韧剪带平行展布，从韧性变形、韧-脆性变形到脆性变形的构造运动依次为左行正滑→左行逆冲→右行正滑。Abstract: Abstract: Field structural analysis and microstructural analysis show that Wulonggou area has experienced a long-term structural evolution, characterized tectonically by multi-level and multi-storeyed products. Its can be broadly divided into the ductile deformation that occurred in early Triassic (240 Ma ±) and its previous period, late Indosinian - early Yanshanian (235-197 Ma) brittle-ductile deformation; brittle deformation that occurred after late Yanshanian period, especially in the early - middle Himalayan period (51-21 Ma). Late Triassic-Early Yanshanian brittle-ductile deformation was accompanied by orogenic uplift, and its performance was exhibited by the folding and faulting of the pre-existing metamorphic core on the northeast wing of the tectonites, which laid the foundation of the NWW-trending main tectonic line in the Wulonggou area, i.e., a number of formal NWW-trending ductile shear zones exhibit parallel distribution, with the tectonic activities developed in order of left-handed positive sliding- left-handed thrusting →right-handed positive sliding.
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