矿床地质2011，Vol.30Issue(3)：435-447,13.
河南罗山县母山钼矿床成矿作用特征及锆石LA-ICP-MS U-Pb同位素年代学
Characteristics of Mo mineralization and zircon LA-ICP-MS U-Pb geochronology of Mushan Mo deposit from Luoshan County, Henan Province
摘要
Abstract
Mushan Mo deposit, a typical porphyry molybdenum deposit occurs in the northern margin of Dabie Mountain, is characterized by veinlet-disseminated mineralization and typical porphyry hydrothermal system alteration envelope centering the unmineralized quartz core formed by silicification early at the top of granitic porphyry. The coexistence of vapour-rich and halite-bearing three-phase inclusions indicates that the primitive magmatic fluid has experienced phase separation under low pressure. The results of homogenization temperatures of fluid inclusions show that the ore-forming element including Mo, Cu deposited by cooling of ore-forming hydrother-mal system. Mushan granitic porpphry related to mineralization exhibits low Sr (< 400 × 10-6), low Yb (<1.8×10-6), strong fractionation of LREE and HREE ((La/Yb)N = 32.13～68.69],moderate to slight Eu negative anomaly (8Eu = 0.66-0.92), and high (87Sr/86Sr)I(0.70 962～0.71 076), extremely low εNd(t)( -14.77～-13.36). The result of zircon LA-ICP-MS U-Pb geochronology that Mushan granitic porphyryemplaced at (142.0 ± 1.8) Ma. It concluded that rock forming and Mo mineralization of Mushan Mo deposit are resulted from the thickened continental crust by partial melting during post-collision of Dabie Mountain, and it happened nearly 10 Ma earlier than granitic magmatism peak (～130 Ma) in early Cretaceous in Dabie region.关键词
地球化学；细脉浸染型矿化；母山钼矿床；锆石U-Pb年龄；河南省Key words
geochemistry/veinlet-disseminated mineralization/Mushan Mo deposit/U-Pb age of zircon/Henan Province分类
天文与地球科学引用本文复制引用
杨梅珍,曾键年,任爱群,陆建培,潘思东..河南罗山县母山钼矿床成矿作用特征及锆石LA-ICP-MS U-Pb同位素年代学[J].矿床地质,2011,30(3):435-447,13.基金项目
本文得到地质过程与矿产资源国家重点实验室开放课题(编号：GPMR201014)和河南省国土资源厅2007年度省“两权价款”地质科研计划项目(编号：2882)的联合资助 （编号：GPMR201014）
