西天山喇嘛萨依铜矿地质特征及成因

喇嘛萨依铜矿位于天山西段库松木切克山北坡,产于中元古界蓟县系库松木切克群。矿体的赋存和形态严格受地层层位、岩相和构造的控制。容矿岩石主要为钾长岩、硅质岩等热液沉积岩。矿体有与围岩整合的层状和切穿围岩层理的脉状两种产状形态。成矿物质来源于深部地层的循环热液,属海底喷气沉积-再造型层控矿床。

GEOLOGIC FEATURES AND GENESIS OF THE LAMASAYI COPPER DEPOSITS IN THE WEST TIANSHAN

The Lamasayi copper deposits occur in the Kushongmuqieke group of the Jixian system in the west Tianshan mountains, and their mineralization was controlled by the stratum, the palaeo-sedimentary environments and the structures ( mainly palaeo-structures ) . The major orebody is concordant with the wall stratum, while some of the minor ones are bed-cutting veins. The silicic and potassic rocks of hydrothermal-sedimentary origine serve as the predominant host rocks. The wall rock alterations are strikingly developed. According to analyses of data, such as contents of the ores, oxygen isotopes in the silicic rocks, and trace elements and sulfur isotopes in the metallic sulfides, the metals as well as a part of the sulfur came from the syngenetic hydrothermal fluid convecting in the underlying stratum and rocks. It is believed that the Lamasayi deposits are part of the submarine exhalative-sedimentary-regenerated origine.