| 东秦岭地区碳酸岩型钼- 铀多金属矿床成矿时代：来自LA- ICP- MS独居石U- Pb和辉钼矿Re- Os年龄的证据 |
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| 引用本文： | 王佳营,李志丹,张祺,李超,谢瑜,李光耀,曾威,丁宁.东秦岭地区碳酸岩型钼- 铀多金属矿床成矿时代：来自LA- ICP- MS独居石U- Pb和辉钼矿Re- Os年龄的证据[J].地质学报,2020,94(10):2946-2964. |
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| 作者姓名： | 王佳营 李志丹 张祺 李超 谢瑜 李光耀 曾威 丁宁 |
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| 作者单位： | 1) 中国地质调查局天津地质调查中心，天津，300170; 2) 中国地质调查局铀矿地质重点实验室，天津，300170;1) 中国地质调查局天津地质调查中心，天津，300170; 2) 中国地质调查局铀矿地质重点实验室，天津，300170；3) 地质过程与矿产资源国家重点实验室，中国地质大学（北京）地球科学与资源学院，北京,100083;4) 国家地质实验测试中心，北京，100029;5) 中国地震局第一监测中心，天津，300180 |
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| 基金项目： | 本文为中国地质调查项目（编号DD20160129；DD20190119；DD20201148）和国家自然科学基金项目（编号41502082）联合资助成果。 |
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| 摘 要： | 东秦岭地区碳酸岩型钼- 铀多金属矿床主要包括华阳川铀多金属矿、黄龙铺和黄水庵钼矿等。其中，华阳川矿床为近期取得勘查突破的一例以U、Nb、Pb为主并伴生稀土元素的超大型铀多金属矿床；黄龙铺钼矿为东秦岭钼矿带中成矿类型最为独特的大型钼矿床。为了精确获得东秦岭地区碳酸岩型钼- 铀多金属成矿时代，本研究采用辉钼矿Re- Os法和LA- ICP- MS独居石U- Pb法，分别对黄龙铺大石沟矿床的辉钼矿、秦岭沟矿床和华阳川矿床含矿碳酸岩脉中的独居石进行测定。结果表明，黄龙铺地区大石沟钼矿辉钼矿Re- Os等时线年龄为221. 3±8. 4Ma（MSWD=10. 9)；秦岭沟钼矿碳酸岩中独居石LA- ICP- MS Tera- Wasserburg年龄为207±11Ma（MSWD=3. 7, n =38)，华阳川铀多金属矿LA- ICP- MS独居石Tera- Wasserburg年龄为222. 5±6. 7Ma（MSWD=1. 8, n =37)，表明该地区碳酸岩中的钼矿化和铀多金属矿化均形成于晚三叠世。综合分析认为，东秦岭地区发育于碳酸岩中的黄龙铺钼矿田、华阳川铀多金属矿是同一成矿系列的产物，碳酸岩型钼- 铀多金属的成矿金属可能来源于地幔，这类碳酸岩可能是秦岭地区印支期造山后伸展环境下的产物。
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| 关 键 词： | 碳酸岩型矿床 辉钼矿Re- Os年龄 独居石U- Pb定年 华阳川 东秦岭 |
| 收稿时间： | 2019/8/19 0:00:00 |
| 修稿时间： | 2019/12/4 0:00:00 |
Metallogenic epoch of the carbonatite- type Mo- U polymetallic deposit in east Qinling: evidence from the monazite LA- ICP- MS U- Pb and molybdenite Re- Os isotopic dating |
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| WANG Jiaying,LI Zhidan,ZHANG Qi,LI Chao,XIE Yu,LI Guangyao,ZENG Wei,DING Ning.Metallogenic epoch of the carbonatite- type Mo- U polymetallic deposit in east Qinling: evidence from the monazite LA- ICP- MS U- Pb and molybdenite Re- Os isotopic dating[J].Acta Geologica Sinica,2020,94(10):2946-2964. |
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| Authors: | WANG Jiaying LI Zhidan ZHANG Qi LI Chao XIE Yu LI Guangyao ZENG Wei DING Ning |
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| Abstract: | The carbonatite- type Mo- U polymetallic deposits in the eastern Qinling mainly comprises of the Huayangchuan U polymetallic, the Huanglongpu Mo, and the Huangshuian Mo deposits. The Huayangchuan is a super- large U- Nb- Pb deposit accompanying rare- earth elements, and the Huanglongpu is a unique large scale Mo deposit in the eastern Qinling molybdenum belt. In this paper, we use molybdenite Re- Os dating and LA- ICP- MS monazite U- Pb dating to precisely determine the timing of the carbonate- type Mo- U polymetallic mineralization in the eastern Qinling. The Re- Os dating of molybdenite samples from the Dashigou Mo deposit yields a Re- Os isochron age of 221. 3±8. 4 Ma. The LA- ICP- MS monazite U- Pb dating in carbonate dyke from the the Qinlinggou Mo deposit and the Huayangchuan U polymetallic deposit yielded Tera- Wasserburg concordant ages of 207±11 Ma (MSWD=3. 7, n =38) and 222. 5±6. 7 Ma (MSWD=1. 8, n =37), respectively. These ages show that U polymetallic and Mo mineralization in carbonates occurred in the Late Triassic. In conclusion, the Huanglongpu Mo orefield and Huayangchuan U polymetallic deposit, which occurred in carbonatites, were formed in the same mineralization series. The ore- forming materials of carbonatite- type Mo- U polymetallic deposit may derived from the mantle, and the carbonatites may be the products of the post- orogenic extensional setting in the Qinling Orogenic Belt. |
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| Keywords: | carbonatite- type deposit Re- Os dating of molybdenite monazite LA- ICP- MS U- Pb dating Huayangchuan East Qinling |
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