喀喇昆仑火烧云超大型喷流-沉积成因碳酸盐型Pb-Zn矿的发现及区域成矿学意义  

Discovery of the Huoshaoyun Super-Large Exhalative-Sedimentary Carbonate Pb-Zn Deposit in the Western Kunlun Area and its Great Significance for Regional Metallogeny

作　　者：董连慧[1,2] 徐兴旺[2] 范廷宾[3] 屈迅[1] 李昊[2,4] 万建领 安海涛[3] 周刚[1] 李基宏[1] 陈刚[1] 刘川[3] 

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局,新疆乌鲁木齐830000 [2]中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京100029 [3]新疆维吾尔自治区地质矿产勘查开发局第八地质大队,新疆阿克苏843000 [4]中国科学院大学,北京100049

出　　处：《新疆地质》2015年第1期41-50,共10页Xinjiang Geology

基　　金：新疆维吾尔自治区地质矿产勘查局自筹资金项目(XGMB2013007)资助

摘　　要：新疆和田火烧云Pb-Zn矿床是喀喇昆仑地区新发现的一个超大型碳酸盐型Pb-Zn矿床,产于中侏罗统龙山组灰岩中。矿体呈层状产出,与地层产状一致,主要由菱锌矿与白铅矿组成,矿石类型以纹层状、块状、角砾状及交代蚀变成因为主。矿体发育沉积超覆构造、韵律层理、粒序层理、鲕粒结构等典型的沉积结构与构造。矿石与围岩方解石的C,O同位素分析结果显示：菱锌矿与围岩方解石的C,O同位素组成相近（其δ13CPDB主要分布在0.78%~3.72‰,δ18OSMOW主要分布在21.71‰~24.87‰）,C,O来源主要为海水;白铅矿δ13CPDB=-7.28~1.19‰,δ18OSMOW=10.78‰~16.81‰,C,O来源为岩浆热液与海水混合流体。矿区菱锌矿与白铅矿的C,O同位素组成与表生氧化带中的碳酸盐型Pb-Zn矿不同。火烧云铅锌矿床闪锌矿Rb-Sr等时线年龄为（186±6）Ma,多宝山铅锌矿床的成矿年龄与火烧云一致。火烧云Pb-Zn矿床具原生层控特征,为喷流-沉积成因,是SEDEX型Pb-Zn矿床的新类型。火烧云碳酸岩型Pb-Zn矿的发现是Pb-Zn矿床成因研究的重要进展,表明喀喇昆仑乃至藏北地区相应构造层位具寻找同类型铅锌矿床潜力。The Huoshaoyun lead-zinc deposit in Hetian County, Xinjiang, is a newly-discovered super-large carbonate Pb- Zn deposit in the western Kunlun area, and present in limestones of the middle Jurassic Longshan Formation. The orebodies are present parallel to strata, mainly consisted of smithsonites and cerussites, and have four subtypes： laminated or banded, massive, breccia and metasomatic. The orebodies have some typical sedimentary structures, such as overlap unconfor- mity, rhythmic layering, graded bedding, and oolitic texture. Carbon and oxygen isotopic results show the following evidence：（1） smithsonites form the Huoshaoyun lead-zinc deposit have simil- ar carbon and oxygen isotopic composition to calcites from the wall rocks（δ13CPDB= 0.78‰~3.72‰, δ18OSMOW= 21.71‰~24.87‰）, implying that they were derived from sea water; and（2） cerussites from the Huoshaoyun lead-zinc deposit have distinct carbon and oxygen isotopic com- position with δ13CPDBof- 7.28‰ ~1.19‰ and δ18OSMOWof 10.78‰ ~16.81‰, suggesting that they were derived from mixtures of sea water and magmatic hydrothermal solution. The Huoshaoyun lead-zinc deposit has different carbon and oxygen isotope composition with worldwide carbonate Pb-Zn ores in supergene oxidation zones. The Huoshaoyun Pb-Zn deposit has a sphalerite Rb-Sr isochron age of 186 ± 6Ma, possibly similar to the Duobaoshan Pb-Zn deposit. The Huoshaoyun Pb-Zn deposit is a primary strata-controlled deposit as a new type of SEDEX Pb-Zn deposits. The discovery of Huoshaoyun Pb- Zn deposit, as an important advance in the genetic research of Pb- Zn deposits, indicates that there is great potential for exploring similar carbonate Pb- Zn deposits in the western Kunlun area as well as the northern Tibetan area.

关 键 词：火烧云 碳酸盐型Pb-Zn矿 C O同位素 RB-SR等时线年龄 喷流-沉积成因 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]