福建省尤溪县卓坑钼矿床元素迁移特征及矿床成因  

Element migration characteristics and genesis of Zhuokeng molybdenum deposit in Youxi County,Fujian Province

作　　者：黄啸宇[1] 汤立伟 詹勇 张起佳 黄维坤 HUANG Xiaoyu;TANG Liwei;ZHAN Yong;ZHANG Qijia;HUANG Weikun(The Second Geological Exploration Institute of CMGB,Fuzhou 350108,Fujian,China;Fujian Yedi Hengyuan Construction Co.,Ltd,Fuzhou 350108,Fujian,China)

机构地区：[1]中国冶金地质总局第二地质勘查院,福州350108 [2]福建冶地恒元建设有限公司,福州350108

出　　处：《地质找矿论丛》2024年第3期326-333,共8页Contributions to Geology and Mineral Resources Research

摘　　要：福建尤溪县卓坑斑岩型钼矿床位于浙闽火山断陷带构造单元内,圈定的17个钼矿体均赋存于晚侏罗世似斑状中细粒二长花岗岩岩体中。本文为了厘定成矿过程中物质迁移规律,对其矿体和同时代似斑状二长花岗岩进行了主微量元素测试分析,并采用标准化Isocon图解法计算元素迁移特征。结果表明,卓坑钼矿床在热液蚀变过程中Au、Ag、As、Na_(2)O等组分发生一定程度的迁出,而SiO_(2)、K_(2)O、CaO、MgO、P_(2)O_(5)、Cu、Pb、Zn、Co、Sn、Bi等组分发生迁入;这些主微量元素迁移特征表明热液蚀变作用是矿区Mo沉淀的主要机制,钼矿化与钾长石化和硅化蚀变关系密切。结合华南地区中生代构造背景,认为卓坑钼矿床是太平洋板块向欧亚板块俯冲背景下形成的斑岩型钼矿床,含矿流体沿岩体内原生裂隙和构造裂隙运移至浅部断裂中沉淀成矿;NE向断裂内及其次级断裂内为其找矿构造标志,似斑状中细粒二长花岗岩体中钾长石化和硅化叠加发育为矿化蚀变标志,石英细脉和网状裂隙为找矿的岩脉标志。Zhuokeng molybdenum deposit is a medium-sized porphyry deposit located in Zhe(zhejiang)-Min(Fujian)volcanic fault depression structural unit in Youxi county,Fujian Province.17 Mo ore bodies all occur in Late Jurassic porphyritic fine-grained monzonitic granite.In this paper material migration law in the ore-forming process is defined,and the element migration characteristics are shown by the standardized Isocon diagram calculation method.During hydrothermal alteration Au,Ag,As,Na_(2)O are moved out,SiO_(2),K_(2)O,CaO,MgO,P_(2)O_(5),Cu,Pb,Zn,Co,Sn,and Bi introduced indicating that the alteration is the main mechanism of Mo precipitation.Mo mineralization is closely related to silicification K-feldsparization.Based on the Mesozoic tectonic setting in South China Zhuokeng molybdenum deposit is considered a porphyritic molybdenum deposit formed under background of subduction of the Pacific plate under Eurasian plate.The ore fluid moves along primary cracks and structural cracks to shallow part to precipitate as ore.NE faults and their sub-faults are the structural mark,overprint of K-feldsparization and silicification developed in the porphyritic fine-grained monzoitic granite the alteration mark,and quartz veins and network fractures the rock vein marks for Mo exploration.

关 键 词：卓坑钼矿床 地质特征 斑岩型矿床 标准化Isocon图解法 热液蚀变作用 尤溪 福建省 

分 类 号：P618.65[天文地球—矿床学]