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| 西秦岭金龙山卡林型金矿床地质-地球化学及矿床成因研究 | |
| 引用本文： | 杨涛,朱赖民,李犇,罗增智,曹东宏,王飞.西秦岭金龙山卡林型金矿床地质-地球化学及矿床成因研究[J].矿物学报,2012,32(1):115-130. |
| 作者姓名： | 杨涛 朱赖民 李犇 罗增智 曹东宏 王飞 |
| 作者单位： | 1. 西北大学地质学系大陆动力学国家重点实验室,陕西西安,710069 2. 甘肃工业职业技术学院,甘肃天水,741020 3. 中国人民武装警察部队黄金第五支队,陕西西安,710100 |
| 基金项目： | 国家自然科学基金项目，西北大学研究生创新教育项目，西北大学大陆动力学国家重点实验室科技部专项项目 |
| 摘 要： | 金龙山金矿床位于南秦岭造山带的复理石褶冲带中,赋矿围岩为碎屑岩-碳酸盐建造,矿化明显受地层岩性与韧-脆性构造发育程度的控制。矿床稀土元素地球化学研究表明,地层岩石、矿石和热液矿物的轻重稀土分异程度和特征参数基本一致,表明成矿流体应主要来自于赋矿地层。铅同位素研究表明,地层岩石、矿石和热液矿物均具有较高的放射性成因的铅同位素组成,且均落入南秦岭造山带的泥盆系范围内,暗示铅也主要来自赋矿地层。对前人已有的碳-氧-硫-氢同位素组成和流体包裹体数据综合分析表明,碳和氧应主要来自海相碳酸盐的溶解作用,硫主要来自海相硫酸盐的热化学还原反应;从成矿早阶段到晚阶段,成矿流体的δ18O及δD值向大气降水线＂漂移＂,指示成矿流体以盆地建造水和变质水为主,在晚阶段有大气降水加入。金龙山金矿床与卡林型金矿床的矿床地质-地球化学特征相似,应属于卡林型金矿床,其形成于秦岭造山带陆内造山作用过程中,多层次陆壳叠置加厚的地球动力学背景,是陆内碰撞造山作用的产物。 |
| 关 键 词： | 金龙山金矿床 卡林型金矿床 地球化学 矿床成因 秦岭造山带 |
A Study on Geology, Geochemistry and Genesis of the Jinlongshan Carlin-type Gold Deposit in Western Qinling Orogen |
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| YANG Tao,ZHU Lai-min,LI Ben,LUO Zheng-zhi,CAO Dong-hong,WANG Fei.A Study on Geology, Geochemistry and Genesis of the Jinlongshan Carlin-type Gold Deposit in Western Qinling Orogen[J].Acta Mineralogica Sinica,2012,32(1):115-130. | |
| Authors: | YANG Tao ZHU Lai-min LI Ben LUO Zheng-zhi CAO Dong-hong WANG Fei |
| Institution: | 1(1.State Key Laboratory of Continental Dynamics,Departm ent of Geology,Northwest University,Xi’an 710069,China; 2.Gansu College of Technology,Tianshui 741020,China;3.Fifth Team,Chinese Arm ed Police Force,Xi’an 710100,China) |
| Abstract: | The Jinlongshan gold deposit is located in the fold-and thrust belt of South Qinling orogenic belt and mainly hosted in the carbonate and clastic rocks.Mineralization is controlled by lithology and the degree of ductile-brittle structural deformation.Host rocks,ores and hydrothermal minerals have similar REE distribution patterns with approximate(La/Yb)N,δEu and δ Ce values,which indicates that the ore-forming fluids are probably derived from host rocks.Lead isotopic date indicates that host rocks,ores and hydrothermal minerals have relatively high radiogenic lead isotopic compositions.The lead isotopic ratios of host rocks,ores and hydrothermal minerals fall in the area of Devonian strata of South Qinling orogenic belt,which suggest that the lead was also derived from host rocks.The known C-O-S-H isotopic compositions and fluid inclusion data indicate C and O of ore-forming fluids are mainly sourced from the dissolution of marine carbonate,and S is originated from the thermochemical reduction of marine sulfate.The δ18O and δD values of ore-forming fluids decreased gradually from early to late mineralization stage,reflecting devolatillizaton of sediments and metamorphic in origin and being mixed with meteoric water in late stage.In terms of the geological-geochemical characteristics of the Jinlongshan gold deposit being similar to Carlin-type gold deposit,it can be classified to the class of Carlin-type gold deposit.The Jinlongshan gold deposit formed in the intracontinental subduction tectonic setting and was a result of intralcontinental orogeny of Qinling orogenic belt. |
| Keywords: | Jinlongshan gold deposit Carlin-type gold deposit geochemistry ore genesis Qinling orogen |
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