摘要
辽西义县是辽宁省主要的萤石矿床产地，萤石产于中元古界长城系蓟县系碳酸盐岩中。为了研究成矿物质来源及矿床成因，对该矿床进行了Sr同位素研究。萤石的Sr同位素N（^87Sr）／N（^86Sr）比值为0．708476-0．708533，该比值介于赋矿碳酸盐岩Sr同位素比值（0．708926-0．722043）和中侏罗统髫髻山组火山岩Sr同位素比值（0．707584-0．710382）之间，表明成矿物质主要来源于赋矿围岩和髫髻山组火山岩，结合Sr同位素图解认为其矿床类型属于热液充填交代型。
The Yixian fluorite deposit in western Liaoning is an important fluorite-producer in Liaoning Province, with fluorites occurring in carbonate rocks of Mesoproterozoic Changcheng and Jixian System. In order to study the source of ore-forming materials and genesis of fluorite deposit, Sr isotopic composition was studied. The results show that Sr isotope ratios of fluorites range from 0. 708 476 to 0. 708 533, higher than those of host carbonate rocks of Mesoproterozoic Changcheng and Jixian System and lower than those of volcanics of Middle Jurassic Tiaojishan Formation. The host rocks and volcanic rocks are the most possible source of ore-forming materials, while the fluorite deposit is a hydrothermal epithermal and metasomatic deposit based on analysis of a series of Sr isotope diagram.
出处
《地质科技情报》
CAS
CSCD
北大核心
2009年第1期82-86,共5页
Geological Science and Technology Information
基金
辽宁省科技规划项目(KJ-2005-001)
辽宁工程技术大学基金项目
关键词
义县
萤石
锶同位素
成矿流体
Yixian
fluorite
Sr isotope
ore-forming fluid
