东昆仑拉陵灶火矽卡岩型铜多金属矿床矿物学特征及其地质意义  

Mineralogical Characteristics of the Lalingzaohuo Copper Polymetallic Skarn Deposit in East Kunlun and Their Geological Significance

作　　者：王金宏 陈家浩 吴华英 王治安 乔玉财 张青福 逯登栋 蔡楠 WANG Jinhong;CHEN Jiahao;WU Huaying;WANG Zhi an;QIAO Yucai;ZHANG Qingfu;LU Dengdong;CAI Nan(Qinghai Yellow River Mining Co.,LTD.,Golmud,Qinghai 816000;Institute of Mineral Resources Research,China Metallurgical Geology Bureau,Beijing 101300;The Fifth Geological Exploration Institute of Qinghai Province,Xining,Qinghai 810028)

机构地区：[1]青海黄河矿业有限责任公司,青海格尔木816000 [2]中国冶金地质总局矿产资源研究院,北京101300 [3]青海省第五地质勘查院,青海西宁810028

出　　处：《地质与勘探》2022年第4期728-739,共12页Geology and Exploration

基　　金：第二次青藏高原综合科学考察研究项目(编号:2019QZKK0801)资助。

摘　　要：拉陵灶火铜多金属矿床是位于东昆仑造山带中部的三叠纪矽卡岩型矿床。为进一步指导勘查找矿工作,本文通过显微观察和电子探针分析对该矿床进行了详细的矽卡岩矿物学研究,以加深对其矿物学特征和成矿规律的认识。研究发现,矿体呈层状、似层状产于金水口岩群和石英闪长岩体,其中MⅤ矿段主要形成于石英闪长岩中大理岩捕掳体的交代蚀变。矿床可划分为4个热液阶段:进化矽卡岩阶段、退蚀变矽卡岩阶段、铜钼硫化物阶段和石英碳酸盐阶段。进化矽卡岩阶段石榴子石核部比边部更富钙铝榴石组分,边部含较多钙铁榴石组分,表明该阶段流体氧逸度逐渐增高。石榴子石和辉石分别以钙铁榴石(Ad_(56)~Ad_(86))和钙铁辉石(Hd_(54~64)Di_(31~41)Jo_(4~5))为主,且辉石Mn/Fe比值<0.1,表明该矿床具有典型矽卡岩铜矿和钼矿的特征。矽卡岩矿物成分还与典型矽卡岩金矿床相似,暗示了其金成矿潜力,因此矿床开采过程中应考虑对铜、钼、金矿化的综合利用。矿体受层状碳酸盐岩分布严格控制,且矿床与石英闪长岩具有密切的成因联系。矿区勘探除了外矽卡岩带,还应加强对成矿岩体内大理岩捕掳体形成的矿体的勘查。The Lalingzaohuo copper polymetallic deposit is a Triassic skarn type deposit located in the middle of the East Kunlun orogenic belt.To further guide the prospecting work,this work studied the skarn in this deposit in detail by microscopic observation and an electron probe microanalyzer,which provides insights into the mineralogical characteristics and metallogenic regularity.Layered or quasi-layered ore bodies occur in the Jinshuikou Group and quartz diorite,among which the ore section No.MⅤwas mainly formed by metasomatic alteration of marble xenolith in quartz diorite.This deposit was involved in four hydrothermal stages,i.e.,the prograde skarn stage,retrograde skarn stage,Cu-Mo sulfide stage and quartz-carbonate stage.The core of the garnet is more grossularite-rich than the edge,indicating that oxygen fugacity increases gradually during the prograde skarn stage.Garnet and pyroxene are mainly andradite(Ad_(56)~Ad_(86))and hedenbergite(Hd_(54~64)Di_(31~41)Jo_(4~5)),respectively,and the Mn/Fe ratio of pyroxene is less than 0.1,indicating that the deposit possesses typical characteristics of skran Cu-Mo deposits.The mineral composition of the skarn is also similar to that of typical skarn gold deposits,indicative of the potential of gold mineralization.The comprehensive utilization of copper,molybdenum and gold mineralization should be thus considered in the mining process of the deposit.The distribution of the ore bodies is strictly controlled by the stratified carbonate rock,and this deposit displays a genetic relationship with quartz diorite.In addition to the exoskarn,the ore bodies formed by marble xenolith in the pluton should also be further explored.

关 键 词：东昆仑 拉陵灶火 矽卡岩 铜多金属矿床 矿物学 

分 类 号：P61[天文地球—矿床学]