摘要
通过对甲玛铜多金属矿床矿石矿物和斑岩S、Pb同位素组成的研究,表明两者S同位素和Pb同位素组成比较一致,变化幅度较小,S同位素基本达到了平衡,显示出岩浆硫组成特点,无论是岩石铅还是矿石铅应具有相同的起源与演化历史,在铅构造模式图上均位于造山带铅演化曲线上。甲玛矿床铜多金属矿床成矿物质主要来自深源岩浆,岩浆和成矿物质起源于参与造山带的下地壳,具有幔源成分的混染。
The study of S and Pb isotopic data for the bearing-copper porphyries and metals in Jiama copper polymetallic deposit, show that the S isotope and Pb isotope compositions from ore minerals are similar to those from porphyries, and vary slightly. The sulfur isotope fractionation in the ore fluid almost reaches the equilibrium, showing the typical signa- ture of mantle S. The uniform Pb isotope compositions for the deposit imply that the Pb isotopes may have the same origin and similar developing history. The Pb isotopes are plotted mostly between the mantle and orogenic belt evolution curves in the plumbotectonic framework diagram. The ore-forming materials in Jiama copper polymetallic deposit were mainly from magma. The ore-forming porphyry was formed due to upper-crust under the orogene, and the input of enriched mantle components.
出处
《金属矿山》
CAS
北大核心
2012年第6期102-105,共4页
Metal Mine
基金
国家973项目(编号:2011CB403103)
中央公益性行业科研专项课题(编号:200911007-02)
科技部行业专项协作研究项目(编号:200911007-12)
关键词
S同位素
PB同位素
铜多金属矿床
西藏甲玛
Sulfur isotope, Lead isotope, Copper polymetallie deposit, Tibet Jiama
