陕西镇安县锡铜沟铅锌矿成矿地质特征
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摘要
陕西镇安锡铜沟铅锌矿床过去一直被认为是SEDEX型矿床,笔者认为锡铜沟铅锌矿床可能属于造山型铅锌矿床。区内矿体斜切地层,赋矿地层为泥盆纪大枫沟组,通过氢、氧、硫及铅等同位素的研究,成矿的物质来源为南缘的泥盆纪海相沉积地层。成矿阶段划分为3个阶段,即早阶段为无矿石英阶段,中阶段为含硫化物-石英脉阶段,晚阶段为石英-碳酸盐脉阶段。矿床形成的时间应该是晚三叠世至侏罗纪,扬子板块与华北板块的陆陆碰撞,秦岭微板块内部发生了一系列的陆内俯冲或逆冲推覆,热异常驱动流体循环,萃取地层内的成矿元素,并将成矿元素搬运至有利于流体聚集、成矿物质卸载的空间,使成矿物质富集成矿。
Xitonggou lead and zinc deposit in Zhen'an county of Shaanxi province has commonly been considered as a sedimentary-exhalative(SEDEX) type deposit, but the author thinks that the deposit may be an orogenic type deposit. The ore bodies in the deposit area cut across the strata and these strata belong to the Devonian Dafengou formation. Through study on hydrogen, oxygen, sulfur and lead isotope of this deposit, it is found that the source of the ore-forming material is Devonian marine sedimentary strata in the southern margin. The mineralization may be divided into three stages. The early stage is quartz stage, the middle stage is sulfide-quartz stage, and the late stage is quartz-carbonate stage. The forming time should be formed in late Triassic to Jurassic period. When the Yangtze plate collided with the North China plate, the collision had led to a series of intracontinental subduction or thrust events inside Qinling microplate, and produced a thermal anomaly. Thermal anomaly drives fluid circulation, extracts ore-forming elements from strata, and transports them to space which is suitable for fluid accumulation and unloading of ore-forming materials. Thus, ore-forming materials have been concentrated.
Xitonggou lead and zinc deposit in Zhen'an county of Shaanxi province has commonly been considered as a sedimentary-exhalative(SEDEX) type deposit, but the author thinks that the deposit may be an orogenic type deposit. The ore bodies in the deposit area cut across the strata and these strata belong to the Devonian Dafengou formation. Through study on hydrogen, oxygen, sulfur and lead isotope of this deposit, it is found that the source of the ore-forming material is Devonian marine sedimentary strata in the southern margin. The mineralization may be divided into three stages. The early stage is quartz stage, the middle stage is sulfide-quartz stage, and the late stage is quartz-carbonate stage. The forming time should be formed in late Triassic to Jurassic period. When the Yangtze plate collided with the North China plate, the collision had led to a series of intracontinental subduction or thrust events inside Qinling microplate, and produced a thermal anomaly. Thermal anomaly drives fluid circulation, extracts ore-forming elements from strata, and transports them to space which is suitable for fluid accumulation and unloading of ore-forming materials. Thus, ore-forming materials have been concentrated.
引文
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[2] 翟裕生,姚书振,蔡克勤.矿床学(第三版)[M].北京:地质出版社,2011:216-232.
[3] 陈衍景.造山型矿床、成矿模式及找矿潜力[J].中国地质,2006,33(6):1181-1192.
[4] 张国伟,盂庆仁,于在平,等.秦岭造山带的造山过程及其动力学特征[J].中国科学(D辑),1996,26:193-200.
[5] 陈华勇,鲍景新,张增杰,等.新疆望峰金矿成矿物质和流体来源同位素示踪——碰撞造山成矿作用研究示例[J]中国科学D辑,2000(Z1):45-52.
[6] 陈衍景,富士谷.豫西金矿成矿规律[M].北京:地震出版社,1992:1-234.
[7] 祁思敬,李英.秦岭泥盆系铅锌成矿带[M].北京:地质出版社,1993:112-118.
[8] 王集磊,何伯墀,李健中,等.中国秦岭型铅锌矿床[M].北京:地质出版社,1996:30-48.
[9] ROSLER H J,LANGE H.Geochemical Table[M].Amsterdam:Elsevier,1972:12-27.
[10] 陈衍景,隋颖慧.CMF模式的排他性依据和造山型银矿实例:东秦岭铁炉坪银矿同位素地球化学[J].岩石学报,2003,19(3):551-568.
[11] 王瑞廷,李芳林,陈二虎,等.陕西凤县八方山一二里河大型铅锌矿床地球化学特征及找矿预测[J].岩石学报,2011,27(3):779-793.
[12] 胡健民,崔建堂,孟庆任,等.秦岭柞水岩体锆石U-Pb年龄及其地质意义[J].地质论评,2004,50(3):323-329.
[13] 李福东,邹湘华,高纪璞,等.马鞍桥微细侵染型金矿床快速定位预测研究[J].西北地质,2001,34(1):27-63.
[14] 蔡锦辉,张业明,付建明,等.鄂西北银洞沟银多金属矿床成因探讨[J].地球学报,1999,20(增刊):316-320.
[15] 秦正永,雷世和.武当群成岩年龄新资料兼讨论[J].中国区域地质,1996(2):176-185.
[16] 冯建忠,汪东波,王学明,等.甘肃礼县李坝大型金矿床成矿地质特征及成因[J].矿床地质,2003,22(3):257-263.
[17] 齐金忠,袁士松,李莉,等.甘肃文县阳山金矿床地质地球化学研究[J].矿床地质,2003,22(1):24-31.
[18] 邵世才,汪东波.南秦岭三个典型金矿床的Ar-Ar年代学及其地质意义[J].地质学报,2001,75(1):106-110.
[19] 王平安,陈毓川,裴荣富,等.秦岭造山带区域成矿系列、构造-成矿旋回与演化[M].北京:地质出版社,1998:1-161.
[20] 张复新,季军良,龙灵利,等.南秦岭卡林-似卡林型金矿床综合地质地球化学研究[J].地质论评,2001,47(5):492-499.
[21] 柳森.李坝金矿床地质特征.见:刘东升主编,中国卡林型金矿[M].南京:南京大学出版社,1994:160-202.