西拉沐伦钼矿带半拉山斑岩钼矿床花岗斑岩锆石SHRIMP U-Pb测年及其地质意义

西拉沐伦钼矿带半拉山斑岩钼矿床花岗斑岩锆石SHRIMP U-Pb测年及其地质意义

曾庆栋|刘建明

中国科学院 |矿产资源研究重点实验室/地质与地球物理研究所|北京 100029

收稿日期:2009-11-09 出版日期:2010-07-26 发布日期:2010-07-26
作者简介:曾庆栋(1964-)|男|山东青州人|副研究员|主要从事区域成矿与预测研究|E-mail:zqdong@sohu.com
基金资助:
国家自然科学基金项目（40972065）；全国危机矿山找矿专项综合研究项目（20089931）；国家“973”计划项目(2006CB403500)

Zircon SHRIMP U-Pb Dating and Geological Significance of the Granite Porphyry from Banlashan Porphyry Molybdenum Deposit in Xilamulun Molybdenum Metallogenic Belt

ZENG Qing-dong, LIU Jian-ming

Key Laboratory of Mineral Resources/Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029|China

Received:2009-11-09 Online:2010-07-26 Published:2010-07-26

摘要/Abstract

摘要：

半拉山斑岩钼矿床是大兴安岭南段中生代西拉沐伦钼矿带中重要的钼矿床之一。矿床产于晚侏罗世火山岩中，矿区发育中生代侵入杂岩，侵入岩主要包括花岗闪长岩、闪长岩及花岗斑岩。矿床形成与侵入杂岩岩浆演化晚期岩浆活动有关。花岗斑岩锆石SHRIMP U-Pb定年表明，与成矿有关的晚期花岗斑岩侵位于(132.1±1.8) Ma。这表明，半拉山钼矿化发生在早白垩世，形成于中国东部岩石圈减薄构造环境。结合已有资料分析，认为大兴安岭南段除铅锌银铁铜等矿床之外，在白垩纪发生过重要的钼矿成矿作用，与白垩纪花岗斑岩有关的钼矿化是今后重要的找矿方向。

关键词: 锆石SHRIMP U-Pb 定年, 斑岩钼矿床, 西拉沐伦钼矿带, 大兴安岭南段

Abstract:

Banlashan porphyry molybdenum deposit is one of most important deposits in the poorly known Mesozoic Xilamulun Mo metallogenic belt in south segment of Greater Xing’an Mountains. The deposit is located in Late Jurassic volcanic rocks. The Mesozoic intrusive complex developed in mining area consist of granodiorite, diorite and granite porphyry. It was thought that formation of the deposit was related to the latest stage of magmatic activities. Zircon SHRIMP U-Pb dating from granite poprhyry indicate that the ore-forming-related granite porphyry emplaced at (132.1±1.8) Ma. It was cosidered that Mo mineralization occurred in Early Cretaceous, and formed in lithospheric thining settings in East China. Based on summarizing available isotope ages, it was suggested that a significant molybdenum minearalization related to magmatism occured at Cretaceous in the south segment of Greater Xing’an Mountains, besides Pb, Zn, Ag, Cu and Fe mineralization. The molybdenum mineralization related to Cretaceous granite porphyry will be an important prospecting target.

Key words: zircon SHRIMP U-Pb dating, porphyry molybdenum deposit, Xilamulun molybdenum metallogenic belt, south segment of Greater Xing’an Mountains

中图分类号:

P618.65

曾庆栋, 刘建明. 西拉沐伦钼矿带半拉山斑岩钼矿床花岗斑岩锆石SHRIMP U-Pb测年及其地质意义[J]. J4, 2010, 40(4): 828-834.

ZENG Qing-dong, LIU Jian-ming. Zircon SHRIMP U-Pb Dating and Geological Significance of the Granite Porphyry from Banlashan Porphyry Molybdenum Deposit in Xilamulun Molybdenum Metallogenic Belt[J]. J4, 2010, 40(4): 828-834.

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