摘要
芦子园铅锌矿为保山-镇康地块中一个重要的热液矿床。矿床赋存于早古生代碳酸盐岩中,经人工分选出矿石中的闪锌矿、黄铜矿、与矿石硫化物密切共生的热液石英及石英钾长石脉中的钾长石等共10件单矿物样品,采用Rb-Sr同位素定年分析,获得等时线年龄141.9±2.6 Ma,初始锶同位素组成为87Sr/86Sr(t=141.9 Ma)=0.714 497。揭示成矿作用时代与中特提斯怒江洋闭合时期大致相当,矿石初始锶同位素组成也与保山-镇康地块中燕山期花岗岩初始Sr同位素组成基本一致,指示矿床的成因可能与燕山期岩浆活动有关,是中特提斯怒江洋闭合过程中碰撞造山作用的响应。
The Luziyuan lead-zinc deposit hosted in the early paleozoic carbonate rocks is an important ore deposit in the Baoshan-Zhenkang block.10 sulfide mineral separates including sphalerites,chalcopyrites,paragenous related quartz and feldspar were separated by hand picking.Rb-Sr analyses yield an isochron age of 141.9±2.6 Ma and an initial 87Sr/86Sr of 0.711 85.It reveals that the mineralization is contemporaneous with the closure of the meso-Tethys ＂Lujiang＂ ocean and the initial Sr isotopic composition of the deposit ore is analogues to that of the Yanshanian granitoid in the Baoshan-Zhenkang block.It can be concluded that the mineralization is genetically related with the granitic magmatism of orogeny which is responsible to the closure of the Meso-Tethys ＂Lujiang＂ ocean.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2011年第1期73-79,共7页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展计划项目(2009CB421005)
中国科学院重要方向项目(KZCX2-YW-111)
矿床地球化学国家重点实验室专项经费(KCZX2009)资助成果
