新疆伊吾韧性剪切带的发现及其成矿地质作用探讨

Treatment of Discovery on Ductile Shear Belts in Yiwu,Xingjiang Province and Its Ore-forming Geology Process

新疆伊吾韧性剪切带变形组构较发育,序列演化明显,存在逆冲剪切和韧—脆性变形转换,变形时代为华力西早期,早于晚二叠世。其形成时代应早于研究区岩浆侵入活动时期。变形机制属地壳中深层次塑性流变和韧性剪切,经历了多期多阶段演变等特征。该剪切带控制了该区的成矿带、矿化带、矿体的产状。对中—低温热液金银铜等主要矿产的成矿作用和分布规律作了初步探讨,粗略判断成矿过程大概是在地质事件多发的晚古生代,并且成矿具多期性和多源性。

Of ductile shear belts, deformation fabric considerably developed in Yiwu, Xingjiang Province and sequence evolution occur apparently, there exist transformation of thrust shear and ductile - brittle deformation, the deformation period is in early Variscan previous to late Permian. Its age of forming is earlier than magma eruption in the area of researching. Deformation mechanism is attributed to plastic rheology and ductile shear at middle - deep levels in the crust, experiencing characteristics of evolution during multiphase and stages. This shear zone dominates the ore -forming belts, mineralized zones and orebody attitudes in the region. A primitive treatment of metallogensis and regularities in distribution is made for the chief minerals as mesothermal- epithermal gold- silver- copper, ore- forming course is generally judged to the late Paleozoic with geologic events occurred frequently and mineralization bear multinhase and multi origins.