新疆阿尔泰山南缘产于麦兹泥盆纪火山-沉积盆地铅锌矿床稳定同位素特征  

STABLE ISOTOPE OF PB-ZN DEPOSITS OCCURRED IN THE MAIZI DEVONIAN VOLCANIC SEDIMENTARY BASIN IN THE SOUTH MARGIN OF ALTAY MOUNTAIN,XINJIANG

作　　者：王书来[1] 陈克强[2] 康吉昌 郭全 

机构地区：[1]有色金属矿产地质调查中心,北京100012 [2]新疆国土资源厅规划研究院,乌鲁木齐830011 [3]新疆有色地质勘查局706大队,阿勒泰836500 [4]新疆有色黄金建设公司,乌鲁木齐830002

出　　处：《地质与勘探》2007年第6期25-31,共7页Geology and Exploration

基　　金：国家重点基础研究发展规划项目(编号:2001CB409806);国土资源大调查项目(编号:200210200022)资助。

摘　　要：麦兹火山-沉积盆地内铅锌矿呈似层状、透镜状,矿石构造以条纹条带状、块状、斑杂状为主,矿物成分相对简单,矿体直接容矿围岩为火山-沉积岩。矿床3δ4S值为-20.6‰^-10‰;矿床石英流体包裹体水的δD值为-89.1‰^-49.48‰,1δ8OSMOW值为4.7‰~1.2‰。矿化层中方解石的1δ3C值介于-6.7‰^-14.3‰之间,1δ8O值在10.3‰~12.9‰之间。矿床属火山-沉积岩容矿的块状硫化物矿床,介于典型的火山岩容矿的块状硫化物型矿床(VHMS)和典型沉积岩容矿的硫化物矿床(SEDEX型)之间的过渡类型(一种新类型块状硫化物矿床)。Pb -Zn deposits in the Maizi volcano - sedimentary basin occur in stratiform - oid and lentiform. Ore bodies are directly hosted in volcanic - sedimentary rocks. Ore structure is predominantly banded, massive and mottled with relatively simple ore composition. Ore δ^34S value ranges from -20.6‰ to - 10‰.δD value of water in fluid inclusion hosted in quartz is - 89.1‰ - - 49.48‰, and δ^18 OSMOW value of 4.7‰-1.2‰. Calcite δ^13 C Value in mineralized horizons yields -6.7‰ - - 14.3‰ and δ^18O value of 10.3‰ - 12.9‰. Correspondingly, calcite of ore - barren or slightly lead - mineralized produces gives δ^13C value of 0. 6‰ - - 1.7‰ and δ^18O value of 13.5‰-18.0‰. It is suggested that the deposit belongs to a volcanic -sedimentary hosted massive sulfide deposit, i. e. , a new - type massive sulfide deposit or an intermediate type between typical volcanic - hosted massive sulfide deposit （VHMS type） and typical sedimentary exhalative deposit （SEDEX type）. Mineralization characteristics are similar to that of ＂Iberian -type＂ deposits.

关 键 词：稳定同位素特征 铅锌矿床 火山-沉积盆地 麦兹 

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