新疆喀拉萨依含锡花岗岩体地质特征及成岩成矿机制

通过对大量实际资料的分析认为,喀拉萨依含锡花岗岩体形成于造山期后阶段,年龄300Ma左右,岩体中出露的肉红色和灰白色黑云母钾长花岗岩由强分异岩浆先后侵入形成,二者具同源演化关系;原始岩浆为上地壳变碎屑质沉积岩部分熔融形成的黑云母二长花岗质岩浆;发育于岩体边部的云英岩型锡矿化同岩浆期后富含氟的高温气液流体作用有关。

GEOLOGICAL CHARACTERISITICS AND DISGENETICMETALLOGENIC MECHANISM OF KARASAY Sn-BEARING GRANITIC BODY IN XINJIANG

The paper discusses the geological characteristics and disgenetic-metallogenie mehanism of Karasay Sn-bearing granitic body in Xinjiang, on the basis of a vast amount of geological and geochemical data. The main conclussions from this study are as follows. (1) Karasay granitic body, its age being about 300 Ma, intruded in the postorogenic stage. (2) The yellowish pink and greyish white biotite syenogranite outcropping in the granitic body formed by early and late intrusion of intensely differentiated magma. They were affinity and their parent was biotite monzogranite magma that originated from partial melting of metamorphic clastic sedimentary rock in the upper earth crust. (3) The greisen-type cassiterite metallization in the edge zone of the granitic body had to do with the postmagmatic F-rich high temperature hydrothermal fluid.