凤太矿集区中部西坝岩体地球化学与演化探讨  

Discussion on the geochemistry and evolution of Xiba rock mass in the central part of Fengtai high ore concentration area

作　　者：王雷 田涛 李伟 张斌 张革利 王飞 郑淑新 Wang Lei;Tian Tao;Li Wei;Zhang Bin;Zhang Geli;Wang Fei;Zheng Shuxin(Baoji 717 Corps Limited of Northwest Nonferrous Geological and Mining Group;Shaanxi Academy of Environmental Sciences;Shaanxi Center of Geological Survey and Planning Research)

机构地区：[1]宝鸡西北有色七一七总队有限公司,721015 [2]陕西省环境科学研究院 [3]陕西省地质调查规划研究中心

出　　处：《黄金》2021年第9期25-30,共6页Gold

基　　金：中国地质调查局地质调查项目(DD2016005213)。

摘　　要：西坝岩体是南秦岭造山带印支期花岗岩带的重要组成部分,也是凤太矿集区内重要的岩浆活动产物。近年来,越来越多的矿产勘查成果表明,该矿集区内矿床的形成与岩浆活动关系密切。以西坝岩体为研究对象,通过岩相学、地球化学特征研究,认为花岗闪长岩、黑云二长花岗岩、石英闪长岩、石英二长闪长岩具有相似的岩浆来源,是不同期次侵位形成的,岩浆主要来源于深部下地壳中基性变火成岩部分熔融,后期偏中酸性岩浆岩是西坝岩体周围金矿形成的重要地质体,为凤太矿集区金矿勘查工作提供新思路。The Xiba rock mass is an important part of the Indosinian granite belt in the South Qinling orogenic belt,also an important magmatic activity product in Fengtai high ore concentration area.In recent years,more and more mineral exploration results have shown the genesis and magmatic activity of the deposits are closely related in the high ore concentration area.This paper chose the Xiba rock mass as the research object.Based on the study of petrographic and geochemical characteristics,it is believed that granodiorite,biotite adamellite,quartz diorite,and quartz monzodiorte had similar magmatic sources and were formed in emplacement of different phases.The magma mainly derived from partial melting of basic metaigneous rocks in the deep lower crust.The neutral and acidic magmatic rocks of the latter stage were important geological body for gold ore forming around Xiba rock mass.The study provides a new prospecting perspective for gold prospecting in Fengtai high ore concentration area.

关 键 词：地球化学 花岗岩 西坝岩体 岩浆来源 凤太矿集区 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]