熊耳山沙坡岭钼矿辉钼矿Re-Os定年及东秦岭晚侏罗世钼矿化的识别

河南沙坡岭矿床位于华北克拉通南缘的熊耳地体,产在燕山期花岗岩与围岩太华超群的外接触带, 为东秦岭最近发现的细脉浸染型钼矿床.矿体受断裂或围岩裂隙控制,呈细脉、网脉状产出,矿石类型包括 细脉状、浸染状和块状.为确定沙坡岭钼矿床成矿时代,本文利用辉钼矿R e - O s同位素定年,研究表明：采 集的6件辉钼矿样品Re- Os单样年龄为158.3 ±1.5 ~ 160. 7 ±1.2 Ma,其加权平均值为160 ±1 Ma（2〇？误 差,MSWD =2. 1）,指示沙坡岭钼矿化发生于晚侏罗世,且早于花山岩基约30 Ma,指示与花岗岩基无关. 另外,一件产于花山复式岩体的团块状辉钼矿样品R e - O...

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Bibliographic Details
Published in岩矿测试 Vol. 36; no. 3; pp. 305 - 317
Main Author 岳素伟 邓小华 姚军明 孙亚莉
Format Journal Article
LanguageChinese
Published 华南理工大学广州学院珠宝学院,广东广州,510800%北京矿产地质研究院,北京,100012%中国科学院广州地球化学研究所,广东广州,510640 2017
Subjects
Re-Os定年
东秦岭钼矿
沙坡岭钼矿床
辉钼矿
辉钼矿
East Qinling Orogenic belt
Shapoling Mo deposit
沙坡岭钼矿床
Re-Os定年
Re-Os isotopic dating
东秦岭钼矿
molybdenite
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ISSN0254-5357
DOI10.15898/j.cnki.11-2131/td.201704060052

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Summary:河南沙坡岭矿床位于华北克拉通南缘的熊耳地体,产在燕山期花岗岩与围岩太华超群的外接触带, 为东秦岭最近发现的细脉浸染型钼矿床.矿体受断裂或围岩裂隙控制,呈细脉、网脉状产出,矿石类型包括 细脉状、浸染状和块状.为确定沙坡岭钼矿床成矿时代,本文利用辉钼矿R e - O s同位素定年,研究表明：采 集的6件辉钼矿样品Re- Os单样年龄为158.3 ±1.5 ~ 160. 7 ±1.2 Ma,其加权平均值为160 ±1 Ma（2〇？误 差,MSWD =2. 1）,指示沙坡岭钼矿化发生于晚侏罗世,且早于花山岩基约30 Ma,指示与花岗岩基无关. 另外,一件产于花山复式岩体的团块状辉钼矿样品R e - O s单样年龄为130.5 ±1.0 Ma,与赋矿的花山岩体 成岩时代一致,同样与前人报道的辉钼矿年龄（125.4 ~ 129.4 Ma）基本一致,且不存在明显的单颗粒辉钼 矿187Os迁移,表明部分钼矿化形成于早白垩世.因此,辉钼矿Re - O s同位素定年显示沙坡岭矿床存在晚侏 罗世和早白垩世两期钼矿化.结合矿床地质特征、成矿构造演化,认为沙坡岭钼矿与熊耳地体的花山岩基、 花岗斑岩以及相关热液矿床,均属于秦岭造山带陆陆碰撞过程中挤压向伸展转变体制的产物.
Bibliography:The Shapoling Mo deposit is located in mass of the southern margin of the North China Craton. The deposit is hosted in a contact zone between granite and wallrocks of the Taihua Soupergroup,which is a recently found discovered vein dissemination type deposit in East Qinling. The ore-bodies are associated with quartz veins and controlled by subsidiary faults. The mineralization styles include veinlet and disseminated types. In order to determine the ageof the Shapoling Mo deposit, Re-Os isotopic dating of molybdenite was conducted. Six molybdenite samples yielded Re-Os ages ranging from 158. 3 ± 1. 5 Ma to 160. 7 ± 1. 2 Ma,with a weighted mean age of 160 ±1 Ma （2cr,MSWD= 2. 1）. The Re-Os age shows that the Mo mineralization occurred during the late Jurassic, earlier than theformation of Huashan rock mass （ about 30 Ma） . In addition, one molybdenite sample in Huashan rock mass yielded a Re-Os age of130. 5 ± 1.0 Ma,which is in accordance with the age of the Huashan pluton and molybdenite age （ 125. 4 - 129. 4 M
ISSN:0254-5357
DOI:10.15898/j.cnki.11-2131/td.201704060052