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| 新疆乌伦布拉克铜矿床成矿地质地球化学及矿床成因 | |
| 引用本文： | 喻亨祥,夏斌,刘家远,袁奎荣.新疆乌伦布拉克铜矿床成矿地质地球化学及矿床成因[J].大地构造与成矿学,2002,26(2):172-178. |
| 作者姓名： | 喻亨祥 夏斌 刘家远 袁奎荣 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,广东,广州,510640;桂林工学院,广西,桂林,541004 2. 中国科学院广州地球化学研究所,广东,广州,510640 3. 桂林工学院,广西,桂林,541004 |
| 基金项目： | 国家重点基础研究发展计划(973计划)，国家攀登计划，国家自然科学基金，桂林工学院校科研和教改项目，2001CB409806,G1999043204，95-预-25，49772109，200101，，，， |
| 摘 要： | 新疆乌伦布拉克铜矿床直接产于一套由浅成—超浅成或次火山侵入的黑云母闪长岩、石英闪长岩、斜长花岗岩和英安玢岩质隐爆角砾岩构成的花岗质潜火山杂岩中。含矿岩石属钙碱系列,具有低Si、低碱,富Na贫K,过铝质-偏铝质,轻稀土富集、重稀土亏损、铕弱负异常,强不相容元素相对富集,Nb和Ti强烈亏损,Rb、Th、K、Tb相对富集等岩石地球化学特征,成因上属造山壳幔同熔型花岗岩类,成岩时代属华力西中晚期。矿化作用以全岩式铜矿化为特征;矿石构造为浸染状、细脉浸染状、网脉状及团块状;矿石中发育交代结构和固溶体分离结构。蚀变以钾化、绢英岩化、硅化、青盘岩化广泛发育为特征。石英-钾长石-黄铜矿脉中石英包裹体水δD为-102×10-3,δ18O为8.4×10-3,均一温度为119～190℃。矿床成因属典型的含矿化隐爆角砾岩筒的斑岩型铜矿床。 |
| 关 键 词： | 地质地球化学 矿床成因 铜矿床 乌伦布拉克 新疆 |
| 文章编号： | 1001-1552(2002)02-172-07 |
| 修稿时间： | 2001年10月20日 |
GEOCHEMISTRY OF THE ULUNBULAKE COPPER ORE DEPOSIT AND ITS GENESIS, XINJIANG, CHINA |
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| Abstract: | The ore-bearing rocks from the Ulunb ulake copper deposit are a series of h ypabyssal,shal-low-hypabyssal or subvolcanic intr usive granitic subvolcanic complex including plagiogranite,quartz di orite,diorite and dacite porphyrite crypt oexplosion breccia.The major eleme nts of the series of rocks show they are SiO 2 -saturated but low-content,Na-ric h,K-poor,alkali-poor,peraluminous-metaluminous and calc-alkaline series.Chondrite-normalized tran sition element patterns of lamprophyres show they are characteristic of LRE E-rich,HREE-inadequate,gently negative Eu-shoreline.Primeval mant le-normalized incompatible elemen ts patterns which are poor in Nb,Ti,and rich in Rb,Th,K,Tb show they are rich in highly incompatible elements.The series of rocks happen ed in Middle-Late Variscan epoch.In respect of the genesis,they should belong to the orogenic transitional granitoid,which are characteristic of the crust-mantle migma source,a nd epicontinental orogenic arc geotec tonic setting.The ore deposit is characteristic of whole-rock metalliz ation and disseminated,veinlet-dissemi nated,network and crumb minerlizations.Replacement remnant and poiki litic ore textures are developed.The oreb ody's wall-rock alteration chiefly include potassium,phyllication,sili-cification and propylitization.By determination of liquid inclusion i nside quartz from quartz-potassium feldspar-chalcopyrite ore vein,its metallogenetic temperature is fro m 119℃to 190℃,δD H2 O is -101.7×10 -3 ,δ 18 O H2 O is 8.4×10 -3 .It is concluded that the deposit is c lassified as the porphyry copper ore deposit with mineralized cryptoexplosion b reccia pipe. |
| Keywords: | Geochemistry porphyry copper ore d eposit Ulunbulake Xinjiang |
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