| 河南大别山北麓千鹅冲特大隐伏斑岩型钼矿床地质特征及成矿时代 |
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| 引用本文：李法岭.2011.Geological characteristics and metallogenic epoch of Qianechong large-size porphyry Mo deposit at the northern foot of Dabie Mountains, Henan Province[J].Mineral Deposits,30(3):457~468 |
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| 基金项目:本文得到河南九州丰源资源有限公司“河南省光山县千鹅冲铜（钼）矿地质详查”项目资助 |
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| 中文摘要:千鹅冲钼矿是在以往铅锌矿、铜矿找矿的基础上，近期在大别山北麓发现的特大隐伏斑岩型钼矿床。矿体赋存于泥盆系南湾组中，主要受隐伏岩体和构造控制；控矿岩体以富硅、富碱、过铝型以及钾含量高于钠为特征，岩体与围岩接触变质作用不发育。矿床成矿方式以充填作用为主，辉钼矿化主要呈浸染状、细脉状、网脉状产出，有经济意义的矿化有3个阶段。常见的围岩蚀变有硅化、钾长石化、黄铁矿化、绢云母化、绿帘石化、绿泥石化、方解石化、磁铁矿化等。选取了主成矿阶段的4件石英细脉型辉钼矿矿石样品进行了Re-Os同位素定年，获得等时线年龄为（128.7±7.3） Ma，模式年龄加权平均为（127.82±0.87） Ma，这一年龄与穿插于钼矿体中的花岗斑岩脉年龄〔（128.8±2.6) Ma〕很接近，可以界定千鹅冲钼矿床形成时间为早白垩世。 |
| 中文关键词:地质学 隐伏斑岩型钼矿 成矿方式 控矿因素 Re-Os同位素年龄 千鹅冲 河南 |
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| Geological characteristics and metallogenic epoch of Qianechong large-size porphyry Mo deposit at the northern foot of Dabie Mountains, Henan Province |
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| Abstract:The Qianechong Mo deposit located in Guangshan County of Henan Province is a superlarge concealed porphyry Mo deposit newly discovered at the northern foot of the Dabie Mountain on the basis of previous prospecting for Pb-Zn and Cu deposits. Ore bodies occur in Devonian Nanwan Formation and are controlled by concealed intrusive bodies and structures. The ore-controlling rock is characterized by rich silica and abundant alkali with high K／Na ratios and aluminum content, and contact metamorphism is not well developed between the rock body and the wall rock. Filling mineralization is dominant in the ore deposit. The main molybdenitized mineralizations include disseminations, veinlets and stockworks, and mineralizations of economical significance can be divided into three stages. The usual alteration types of wall rocks comprise silicification, potassic alteration, pyritization, sericitization, epidotization, chloritization, calcilization and magnetitization. Four veinlet types of quartz Mo-bearing rock samples of the main ore-forming period were selected for Re-Os isotope dating, which yielded the isochron age of (128.7±7.3) Ma and the weighted average model age of (127.82±0.87) Ma, which are consistent with the age （128.8±2.6） Ma of the granitic porphyry dike in the Mo deposit, suggesting that the ore deposit was formed in Early Cretaceous. |
| keywords:geology, concealed porphyry Mo deposit, ore-forming style, ore-controlling factors, Re-Os isotope age, Qianechong, Henan Province |
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