河北洞子沟银铜多金属矿床地质特征及成因分析
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摘要
洞子沟银铜多金属矿床产于华北克拉通北缘长城系常州沟组地层中,受地层控制明显。通过对该矿床地质特征及矿石的稀土元素地球化学特征、矿物流体包裹体特征、硫-氢-氧同位素组成及U-Pb同位素年代研究表明:成矿物质来源于幔源;矿床形成于古元古代晚期华北克拉通吕梁运动后的伸展裂解过程中,在断陷盆地接受沉积的同时,有沿同生断裂上升的幔源热液、银铜金铅锌等成矿物质组分与常州沟组陆源碎屑一同沉积,形成洞子沟银铜多金属沉积层控型矿床。
Dongzigou silver (copper) polymetallic deposit is located in the stratum of Changzhougou Formation of Changcheng System at the north margin of the north China craton.It is a strabound ore deposit.Characteristics of the deposit,geochemical characteristics of REE of the ore,fluid inclusion characteristics,S—H—O isotopes and U-Pb chronology are studied.The results show that the ore materials are derived from mantle and the deposit is formed during the post Lvliang movement extension and splitting of the north China craton in the late palaeo-Proterozoic Era.The fault basin receive sediments and the mantle-sourced hydrothermal fluid move up along the syn-sedimentation fault and syn-sedimentation of Ag,Cu,Pb,Zn etc.and terrestrial materials take place and Dongzigou silver (copper)polymetallic deposit is formed.
Dongzigou silver (copper) polymetallic deposit is located in the stratum of Changzhougou Formation of Changcheng System at the north margin of the north China craton.It is a strabound ore deposit.Characteristics of the deposit,geochemical characteristics of REE of the ore,fluid inclusion characteristics,S—H—O isotopes and U-Pb chronology are studied.The results show that the ore materials are derived from mantle and the deposit is formed during the post Lvliang movement extension and splitting of the north China craton in the late palaeo-Proterozoic Era.The fault basin receive sediments and the mantle-sourced hydrothermal fluid move up along the syn-sedimentation fault and syn-sedimentation of Ag,Cu,Pb,Zn etc.and terrestrial materials take place and Dongzigou silver (copper)polymetallic deposit is formed.
引文
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[2]秦正永.燕山地区与变质核杂岩---伸展构造有关的金、银矿找矿远景[J].前寒武纪研究进展,1997,20(2):37-43.
[3]杨昌正.洞子沟银(金铜)矿床地质特征和成因机制探讨[J].有色金属矿产与勘查,1996,5(2):75-80.
[4]肖成东,艾永富.华北地台北缘中段银多金属矿床与火山岩[J].地质论评,1999,45(7):488-494.
[5]毛德宝,钟长汀,陈志宏,等.华北地块北缘中段铅锌银矿床成矿作用讨论[J].前寒武纪研究进展,2002,25(2):105-112.
[6]钟长汀,毛德宝,胡小蝶,等.洞子沟银多金属矿床成矿时代[J].前寒武纪研究进展,2001,24(1):58-63.
[7]钟长汀,毛德宝,李永峰,等.华北中-新元古代火山岩及其对成矿作用的制约---以河北洞子沟银多金属矿床为例[J].现代地质,2004,18(3):331-338.
[8]毛德宝,钟长汀,陈志宏,等.冀北洞子沟银矿床:一个中元古代的浅成低温热液矿床---来自矿物学和地球化学的证据[J].矿物岩石,2003,23(2):16-21.
[9]段焕春,周琳,徐洪波.河北洞子沟银多金属矿稀土元素特征及找矿模式探讨[J].矿产与地质,2003,17(6):673-678.
[10]段焕春.河北洞子沟银多金属矿矿物标型特征及找矿意义[J].地质与勘探,2004,40(1):55-59.
[11]赵英福,吕增尧.河北兴隆洞子沟银-铜矿床地质特征及成因探讨[J].矿产与地质,2004,18(3):212-216.
[12]阎国翰,蔡剑辉,任康绪,等.华北克拉通板内拉张性岩浆作用与三个超大陆裂解及深部地球动力学[J].高校地质学报,2007,13(2):161-174.
[13]丁建华,肖成东,秦正永.洞子沟地区大红峪组富钾火山岩岩石学、地球化学特征[J].地质调查与研究,2005,28(2):100-105.
[14]胡祥昭,彭恩生,朱余德,等.河北洞子沟银(铜金)矿床成矿地质特征及成因探讨[J].大地构造与成矿学,1999,23(2):152-159.
[15]肖成东,杨伦,魏晓英,等.冀东变质核杂岩中银金矿床地质地球化学特征[J].北京大学学报(自然科学版),2002,38(2):245-251.
[16]陆松年,李惠民.蓟县长城系大红峪火山岩的单颗粒锆石U-Pb法准确定年[J].中国地质科学院院报,1991,22:137-143.
[17]Fukao Y,Maruyama S,Obajshi S.Geologic implication of the whole mantle P-wave tomography[J].Geol Soc Japan,1994,100(1):4-23.
[18]Gurnis M.Large scale mantle convection and aggregation and dispersal of suptrcontientis[J].Nature,1988,332:695-699.
[19]Hoffman P E.Did the breakup of Laurentia turn Gondwana inside out[J].Science,1991,252:1409-1412.
[20]王银川,裴先治,李佐臣,等.祁连造山带东端张家川地区长宁驿中元古代花岗质片麻岩LA-ICP-MS锆石U-Pb年龄及其构造意义[J].地质通报,2012,31(10):1576-1587.
[21]翟明国,卞爱国,赵太平.华北克拉通新太古代末超大陆拼合及古元古代末-中元古代裂解[J].中国科学(D辑),2000,30(增刊):129-137.
[22]赵国春,孙敏,Wilde S A.早-中元古代Columbia超级大陆研究进展[J].科学通报,2002,47(18):1361-1364.
[23]Thomas H V,Large R R,Bull S W,et al.Pyrite and pyrrhotite textures and composition in sediments,laminated quartz veins,and reefs at Bendigo gold mine,Australia:Insights for ore genesis[J].Economic Geology,2004,106(1):1-31.