| 梁涛,卢仁,张宇,陈俊魁,胡红雷.北秦岭蒿坪和梅子沟金矿的 H、O、S、Pb同位素特征和深部过程[J].矿产勘查,2026,17(1):124-134 |
| 北秦岭蒿坪和梅子沟金矿的 H、O、S、Pb同位素特征和深部过程 |
| Isotopic compositions of H, O, S and Pb of the Haoping and Meizigou gold deposits, northern Qinling Orogenic Belt, and their geological implications |
| 投稿时间：2024-11-19 |
| DOI：10.20008/j.kckc.202601010 |
| 中文关键词: 蒿坪 梅子沟 成矿物质 岩石圈拆沉 透岩浆流体 北秦岭 |
| 英文关键词: Haoping Meizigou metallogenic material lithosphere delamination transmagmatic fluids north-ern Qinling Orogenic Belt |
| 基金项目:本文受河南省自然资源科技攻关项目(2022-398-8)、河南省国土资源厅科技攻关项目(2016-08和2014-06)、河南省地质研究院2024年度地质科技攻关项目(2024-903-XM05-KT02、2024-903-XM06和2024-903-XM08)、中国矿产地质志项目(DD20221695、DD20190379、DD20160346)联合资助。 |
| 作者 | 单位 | | 梁涛 | 河南省地质研究院,河南郑州 450016
河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州 450016
河南省有色金属深部找矿勘查技术研究重点实验室,河南郑州 450016 | | 卢仁 | 河南省地质研究院,河南郑州 450016
河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州 450016
河南省有色金属深部找矿勘查技术研究重点实验室,河南郑州 450016 | | 张宇 | 河南省地质研究院,河南郑州 450016
河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州 450016
河南省有色金属深部找矿勘查技术研究重点实验室,河南郑州 450016 | | 陈俊魁 | 河南省地质研究院,河南郑州 450016
河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州 450016
河南省有色金属深部找矿勘查技术研究重点实验室,河南郑州 450016 | | 胡红雷 | 河南省地质研究院,河南郑州 450016
河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州 450016
河南省有色金属深部找矿勘查技术研究重点实验室,河南郑州 450016 |
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| 中文摘要: |
| 为探讨北秦岭蒿坪和梅子沟金矿的成矿动力学过程、揭示成矿物质的释放机制和分析区域 Au成矿潜力及找矿预测区，对其开展了矿石 H、O、S、Pb同位素测试。梅子沟金矿石英样品的 δ18OV-SMOW值分别为 14.3‰和 13.5‰，δDV-SMOW值分别为-41.8‰和-61.5‰，它们的 δ18OH2O值分别为 5.81‰和 3.00‰。蒿坪和梅子沟金矿方铅矿的 δ34S值分别为 -0.6‰~2.0‰和 0.6‰~1.3‰。蒿坪金矿的 206Pb/204Pb比值、207Pb/204Pb比值和 208Pb/204Pb比值范围分别为 18.12~18.29、15.46~15.67和 37.95~38.60，其 Δβ值和 Δγ值分别为 8.70~23.66和 21.01~45.32。梅子沟金矿的 206Pb/204Pb比值、207Pb/204Pb比值和 208Pb/204Pb比值范围分别为 18.14~18.27、 |
| 英文摘要: |
| Based on their geological features, the H, O, S and Pb isotopes of ore samples from the Haoping andMeizigou gold deposits in northern Qingling Orgenic Belt were analyzed in order to discuss the source of ore metals,the controlling factor of deep ore fluids discharge, consider the Au mineralization potential and the exploration tar-gets. The δ18OV-SMOW values of the quartz samples from the Meizigou Au deposit were 14.3‰ and 13.5‰，and the δDV-SMOW values were -41.8‰ and -61.5‰ and the δ18OH2O values were 5.81‰ and 3.00‰, respectively. The δ34S values of the galena samples from the Haoping and Meizigou Au deposits were -0.6‰-2.0‰ and 0.6‰-1.3‰, re-spectively. The samples ratios of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb from the Haoping Au deposits were 18.12-18.29, 15.46-15.67 and 37.95-38.60 with the values of Δβand Δγof 8.70-23.66 and 21.01-45.32, respectively. The sample ratios of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb from the Meizigou Au deposit were 18.14-18.27, 15.46-15.61 and 37.19-38.35, and their Δβand Δγvalues were 9.00-19.14 and 27.36-36.95. The H and O isotopic datahave suggested that ore-forming fluids of the Haoping and Meizigou Au deposits were mainly derived from the mag-matic water and metamorphic water, respectively. The δ34SV-CTD values have shown a tower shape, which has indi-cated a mantle source. The Pb isotopic sample points were close to orogenic line, and fall into subduction zone leadmixed with upper crust and mantle source and orogenic belt lead source. These H, O, S and Pb isotopic features ofthe Haoping and Meizigou Au deposits have suggested that metallogenic materials were derived from lower crustand upper mantle, and the upper crust material has been added in the deposit formation process. The formation ofthe Haoping and Meizigou Au deposits was closely related to the Yanshanian intracontinental (intraplate) orogenesisof the northern Qinling Orogenic Belt, and they were the products of lithosphere delamination at ~130 Ma in EarlyCretaceous. It suggested that there were endogenetic Au metallogenic potential in the northern Qinling OrogenicBelt. The exploration targets and new methods were discussed. |
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