| 小秦岭地区金钼多金属矿成矿特征与找矿预测 |
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| 引用本文： | 王瑞廷,袁海潮,孟德明,王 磊,马文平.小秦岭地区金钼多金属矿成矿特征与找矿预测[J].地球科学与环境学报,2014(1):19-31. |
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| 作者姓名： | 王瑞廷 袁海潮 孟德明 王 磊 马文平 |
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| 作者单位： | [1]长安大学 地球科学与资源学院,陕西西安710054 [2]西北有色地质勘查局地质勘查院,陕西西安710054 [3]西北有色地质勘查局712总队,陕西咸阳712000 |
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| 基金项目： | 国土资源部公益性行业科研专项项目（201111007-3）;“十二五”国家科技支撑计划项目（2011BAB04805） |
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| 摘 要： | 小秦岭地区是中国重要的金钼矿产基地。以构造-岩浆-成矿系统为指导,综合研究认为区内金钼多金属矿床可分为印支期—燕山期与重熔型花岗岩浆侵入活动有关的金(钼)矿床成矿系列和与深源浅成型花岗岩、碱性岩有关的钼(金钨)矿床成矿系列。金(钼)矿床类型主要包括石英脉型、构造蚀变岩型、糜棱岩型、爆破角砾岩型和复合型等,以前两者为主;钼(金钨)矿床类型主要包括斑岩型、斑岩-矽卡岩型、斑岩-爆破角砾岩型、石英-碳酸岩脉型和构造蚀变岩型等,也以前两者为主。该区三叠世以来共发生过3次岩浆侵入活动,每次都伴有不同程度的钼金矿化作用,并分别对应于不同的钼金矿化高峰期。钼的成矿作用分为印支期(210~220 Ma)和燕山期早白垩世早期(140~145Ma)、早白垩世中晚期(110~138Ma);金的成矿作用分为印支期(约220Ma)和燕山期早白垩世中晚期(约130Ma);钼、金成矿在印支期和燕山期早白垩世中晚期叠合,而在燕山期早白垩世早期分离。整体上,区内岩体与断裂构造控矿特征明显,燕山期金钼成矿作用强烈发育。该区娃娃沟—峪耳沟、峪耳沟—曹家沟、太子坪—葫芦沟—荒地沟与文公岭北坡等地区为金钼多金属矿的有利找矿靶区,并应特别重视中酸性小岩体的含矿性评价。
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| 关 键 词： | 金钼矿床 成矿特征 中酸性岩体 印支期—燕山期 找矿标志 找矿预测 小秦岭地区 |
Metallogenic Characteristics and Exploration Prediction of Au-Mo Polymetallic Deposits in Xiaoqinling Area |
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| WANG Rui-ting,YUAN Hai-chao,MENG De-ming,WANG Lei,MA Wen-ping.Metallogenic Characteristics and Exploration Prediction of Au-Mo Polymetallic Deposits in Xiaoqinling Area[J].Journal of Earth Sciences and Environment,2014(1):19-31. |
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| Authors: | WANG Rui-ting YUAN Hai-chao MENG De-ming WANG Lei MA Wen-ping |
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| Institution: | 1. School of Earth Science and Resources, Chang＇an University, Xi＇an 710054, Shaanxi, China; 2. Geological Exploration Institution, Northwest Mining and Geological Exploration Bureau for Nonferrous Metals, Xi＇an 710054, Shaanxi, China; 3. No. 712 Geological Team, Northwest Mining and Geological Exploration Bureau for Nonferrous Metals, Xianyang 712000, Shaanxi, China) |
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| Abstract: | Xiaoqinling area is an important Au-Mo mineral base in China.Based on the tectonic-magmatic-metallogenic system,the Au-Mo polymetallic deposits in Xiaoqinling area can be divided into two metallogenic series：Au （Mo）deposits related to remelting granite magmatic intrusion,and Mo （Au-W）deposits related to deep-hypabyssal granites and alkaline rocks in Indosinian-Yanshanian.The main types of Au （Mo）deposits include quartz vein,structural altered rock-host,mylonite, explosive breccia,composite rock,etc.,and the first two types are predominant.The main types of Mo （Au-W）deposits include porphyry,porphyry-skarn,porphyry-explosive breccia,quartz-carbonate vein,structural altered rock-host,etc.,and the first two types are also predominant. There are three magmatic intrusion activities accompanied by different degrees of Mo-Au＆amp;nbsp;mineralization since Triassic,corresponding to three different peaks of Mo-Au mineralization.Mo mineralization epoch includes Indosinian （210-220 Ma）,the early stage of Early Cretaceous （140-145 Ma） and the middle-late stage of Early Cretaceous （110-138 Ma） in Yanshanian;Au mineralization epoch includes Indosinian （about 220 Ma）and the middle-late stage of Early Cretaceous in Yanshanian （about 130 Ma）;Mo and Au mineralizations coincide in Indosinian and the middle-late stage of Early Cretaceous in Yanshanian,but separate in the early stage of Early Cretaceous in Yanshanian. Characteristics of intrusion and fault tectonic ore-controlling are obvious,and Au-Mo mineralization in Yanshanian is strong in Xiaoqinling area as a whole.The favorable prospecting targets for Au-Mo polymetallic in Xiaoqinling area are Wawagou-Yu＆#39;ergou, Yu＆#39;ergou-Caojiagou, Taiziping-Hulugou-Huangdigou and the northern slope of Wengongling,and the ore-bearing potential evaluation of intermediate-acid small intrusion should be paid attention to. |
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| Keywords: | Au-Mo deposit metallogenic characteristic intermediate-acid intrusion Indosinian-Yanshanian indicator for deposit exploration prediction Xiaoqingling area |
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