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| 河北省青龙满族自治县四拨子-六拨子钼铜矿床成矿流体及成矿机制探讨 | |
| 引用本文： | 李强,孟祥元,武峰,王立生,张志欣,杨富全,刘锋.河北省青龙满族自治县四拨子-六拨子钼铜矿床成矿流体及成矿机制探讨[J].岩石学报,2012,28(1):302-318. |
| 作者姓名： | 李强 孟祥元 武峰 王立生 张志欣 杨富全 刘锋 |
| 作者单位： | 1. 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点开放实验室,北京100037 2. 河北省地质矿产局第五地质大队,唐山,063004 3. 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点开放实验室,北京100037;中国科学院新疆生态与地理研究所,新疆矿产资源研究中心,乌鲁木齐830011 |
| 基金项目： | 本文受矿产资源补偿费项目(200702)资助. |
| 摘 要： | 河北省青龙满族自治县四拨子-六拨子钼铜矿位于燕辽成矿带东部,是近年来发现的中型钼铜矿床。辉钼矿呈细脉状、网脉状、浸染状、薄膜状赋存于长城系石英砂岩及白云岩中的矽卡岩带,钼矿化与硅化关系密切。矿体呈似层状、脉状和透镜状。矿床的形成经历了矽卡岩期和石英-硫化物期,铜和钼矿化主要形成于石英-硫化物期。研究表明,矽卡岩期矿物以发育液体包裹体为特征,石英-硫化物期石英中主要发育液体包裹体、含CO2两相和三相包裹体。矽卡岩期成矿流体为高-中温(192~497℃)、中-低盐度(5.41%~16.53% NaCleqv)、中-低密度(0.59~0.92g/cm3)的NaCl-H2O体系。石英-硫化物期成矿流体为中-低温(主要变化于160~330℃)、低盐度(2.07%~15.17% NaCleqv)和中低密度(0.69~1.01g/cm3)的NaCl-H2O-CO2 (±CH4/N2)型流体。石英的δDSMOW为-128‰~-80‰,δ18OSMOW值为9.6‰~14‰,δ18OH2O值为-3.61%~5.30‰,表明成矿流体具有岩浆水混合大气降水的特征。硫化物的δ34S变化于-0.9‰~5.7‰,平均值为2.9‰,表明成矿物质中硫来自深部岩浆。成矿时代为早侏罗世早期,成矿作用与花岗斑岩岩浆期后热液活动有关。 |
| 关 键 词： | 流体包裹体 稳定同位素 成矿流体 成矿机制 钼铜矿 四拨子-六拨子 |
| 收稿时间： | 2011/10/8 0:00:00 |
| 修稿时间： | 2011/12/3 0:00:00 |
Ore-forming fluids and metallogenetic mechanism of Sibozi-Liubozi molybdenum-copper deposit in Qinglong County, Hebei Province |
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| LI Qiang,MENG XiangYuan,WU Feng,WANG LiSheng,ZHANG ZhiXin,YANG FuQuan and LIU Feng.Ore-forming fluids and metallogenetic mechanism of Sibozi-Liubozi molybdenum-copper deposit in Qinglong County, Hebei Province[J].Acta Petrologica Sinica,2012,28(1):302-318. | |
| Authors: | LI Qiang MENG XiangYuan WU Feng WANG LiSheng ZHANG ZhiXin YANG FuQuan and LIU Feng |
| Institution: | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;No.5 Geological Party of the Hebei Bureau of Geology, Tangshan 063004, China;No.5 Geological Party of the Hebei Bureau of Geology, Tangshan 063004, China;No.5 Geological Party of the Hebei Bureau of Geology, Tangshan 063004, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
| Abstract: | Sibozi-Liubozi molybdenum-copper deposit in Qinglong County is located in the east of Yanliao metallogenic belt,which is a newly-discovered medium-sized molybdenum-copper deposit.Molybdenite occurs in veinlets,stockwork,disseminated and membrane in the skarn hosted in quartz sandstone and dolomite,Changcheng System.The molybdenum mineralization is closely related with silicification.Ore bodies occur as bedded-like,vein and lenticular.On the basis of field evidence and petrographic analysis,the ore-forming process can be divided into two mineralization periods:skarn and quartz-sulfide.The quartz-sulfide period represents the main molybdenum-copper mineralization episode in the Sibozi-Liubozi deposit.Inclusions of the skarn period are dominantly fluid inclusions,while inclusions in quartz of the quartz-sulfide period mostly contain liquid inclusions,CO 2bearing three-phase inclusions and pure CO2 phase inclusions.Ore-forming fluids of skarn period are NaCl-H2 O system,the homogenization temperatures and salinities vary from 1 92 to 497℃and from 5.41%to 1 6.53%equivalent respectively while the densities range from 0.59 to 0.92g/ cm 3 .Ore-forming fluids of quartz-sulfide period are NaCl-H2 O-CO2(±CH 4 /N2)type of fluids,the homogenization temperatures and salinities vary mainly from 1 60 to 330℃and from 2.07%to 1 5.1 7%equivalent respectively while the densities range from 0.69 to 1.01 g/cm 3 .Theδ 18 O SMOW values of quartz in the ore vein range from 9.6‰to 1 4‰with correspondingδ 18 O H2 O values of-3.61‰to 5.30‰andδD values of fluid inclusions between-1 28‰and-80‰.The isotopic data imply that the ore-forming fluids of SiboziLiubozi molybdenum-copper deposit have the characteristic of mixing magmatic and meteoric water.Theδ 34S values of sulfide range from-0.9‰to 5.7‰with an average of 2.9‰,indicating that the sulfur in the fluids was derived from deep-seated magma.The Sibozi-Liubozi molybdenum-copper deposit took place in the earlier times of Early Jurassic,with its metallogenesis related to the late granite porphyry magma hydrothermal activity. |
| Keywords: | Fluid inclusions Stable isotopic Ore-forming fluids Metallogenetic mechanism Molybdenum-copper deposit Sibozi-Liubozi |
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