摘要
桓仁矿床是一个以Ｃｕ、Ｐｂ、Ｚｎ为主的矽卡岩型矿床，围岩为寒武系灰岩，成矿母岩为燕山期辉石闪长岩。矿石与闪长岩长石具有一致的铅同位素组成，２０６Ｐｂ／２０４Ｐｂ为１７．０５０－１７．４１１，２０７Ｐｂ／２０４Ｐｂ为１５．３６７－１５．４５５，２０８Ｐｂ／２０４Ｐｂ为３７．１１０－３８．０４０，μ值为７．８６－８．００，具有低μ值单阶段幔源铅特点。单阶段模式年龄与成矿母岩的Ｋ－Ａｒ年龄及地质时代吻合，是中生代单阶段幔源铅成矿的典型例子。
The Huanren ore deposit is a skarn Cu-pb-Zn deposit with country rock being the Cambrian limestones and ore-forming parent-rock being the Yanshanian augite diorite.The Pb isotopic compositions of galena in ores are similar to those of feldspar in augite diorite,both are characterized by a low μ value and singlestage mantle-source lead.Their 206Pb/204Pb ratio ranges from 17.050 to 17.411,207Pb204Pb from 15.367 to 15.455,and 208Pb/204Pb from 7.86 to 8.00.The single-stage model age of lead is consistent with the K-Ar age of the augite diorite.The deposit is a typical example of the single-stage mantlesource lead mineralization in Mesozoic era.
出处
《地球化学》
CAS
CSCD
北大核心
1994年第C00期32-38,共7页
Geochimica
