矿床地质2011，Vol.30Issue(6)：1069-1074,6.
豫西夜长坪钼矿床辉钼矿铼-锇同位素年龄及地质意义
Molybdenite Re-Os isochron age of Yechangping Mo deposit in western Henan Province and its geological implications
摘要
Abstract
The Yechangping Mo deposit is a porphyry-skarn Mo deposit in the East Qinling-Dabie orogenic belt. Its ore-hosting wall rock is chert banded dolomite belonging to Longjiayuan Formation of Middle Proterozoic Guan-daokou Group, its main ore types are veinlets, stockworks, disseminations and banding, and its major wall rock alterations include diopsidization, phlogopitization, talcization, chloritization, serpentinization, silicification, potassic alteration and carbonation. Five molybdenum-bearing samples were selected for precise Re-Os dating, which yielded model ages ranging from (145.4 + 2.1) Ma to (143.6 + 2.4) Ma and an isochron age of (145.3 ± 4.4) Ma (2a, MSWD=0.80), indicating that the molybdenum deposit was formed in the Late Jurassic-Early Cretaceous period. Based on a study of geodynamic settings of molybdenum deposits of different ages in the East Qinling-Dabie molybdenum belt, the authors hold that the geodynamic setting of the Yechangping Mo deposit is widespread magmatism and back-arc extension caused by subduction of the paleo-Pacif ic plate beneath theEurasian continent.关键词
地球化学/Re-Os同位素定年/斑岩-矽卡岩型钼矿/夜长坪/豫西Key words
geochemistry, Re-Os dating, porphyry-skarn Mo deposit, Yechangping, west Henan Province分类
天文与地球科学引用本文复制引用
毛冰,叶会寿,李超,肖中军,杨国强..豫西夜长坪钼矿床辉钼矿铼-锇同位素年龄及地质意义[J].矿床地质,2011,30(6):1069-1074,6.基金项目
本文得到全国危机矿山接替资源找矿项目(项目编号:20089949和200841019)资助 （项目编号:20089949和200841019）
