摘要
青海省茫崖大通沟南山一带多发育中酸性岩体,岩体与围岩接触交代作用强烈,蚀变现象极发育,受阿尔金山大断裂影响,岩浆侵位机制多样,分别具有不同的侵位机制及制约其成矿专属性。大通沟南山西部-斑红山一带,岩体属被动就位机制,岩性为闪长岩、花岗岩,其内部产有捕虏体状的金、黄铁矿(化)体。大通沟南山北部多为主动就位,岩性为闪长岩,其中产有铜镍矿(化)体,主要产于辉长辉绿岩脉与围岩接触带处,少量形成于达肯大坂岩群碳酸盐岩和泥盆纪闪长岩体围岩中。不同的侵位机制、形成环境及对矿物的运移、富集有不尽相同的影响与约束;所以,研究岩体的侵位机制及成矿作用对本区的矿产种类及产出空间有重要的预测及指导找矿意义。
Some intermediate-acid rockbodies are exposed in the Datong Valley-South Mountain belt,Mangnai,Qinghai.These rockbodies are characterized by intense wallrock alteration,different emplacement mechanism and metallogenetic specialization.Intrusive rocks in the west of the Datong Valley-South Mountain belt are diorite and granite of passive emplacement characterized by Au and pyrite mineralization,while intrusive rocks in the south of the Datong Valley-South Mountain belt is dominated by diorite of active emplacement and characterized by Cu-Ni mineralization in contact with gabbro-diabase dykes.This influence of different emplacement mechanisms on migration and enrichment of ore material is of importance to prospecting in the study area.
作者
杨青
YANG Qing(Sichuan Institute of Uranium Geological Survey,Chengdu 610052)
出处
《四川地质学报》
2021年第1期3-7,12,共6页
Acta Geologica Sichuan
关键词
中酸性岩体
侵位机制
接触带
intermediate-acid rockbody
contact
Datong Valley-South Mountain belt
