四川张家坪子金矿床地质特征及成矿作用
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摘要
张家坪子金矿床位于冕西金矿集中区,矿体赋存于中三叠统第三段第五层(T2~(3-5))的蚀变白云岩及花岗斑岩脉中,矿体与围岩成渐变过渡关系.区内断裂控矿明显,构造线主体为NNE向,张家坪子韧性剪切带是该金矿床惟一的成矿-容矿构造,严格控制着金矿床的形成和矿体的产出.通过C、O、H、S稳定同位素及流体包裹体的研究,认为该矿床成矿热液以变质水为主,并有部分岩浆水,金成矿物质主要来源于地幔,主成矿期为25 Ma;主成矿期成矿温度峰值集中于200~280℃,其成矿深度峰值主要集中在1.5~2.4 km,属于浅成低温热液型金矿床.
Zhangjiapingzi gold deposit is located in the West Mianning county gold concentration area and the ore bodies are hosted in the middle Triassic fifth layer(T2~(3-5)) near the metasomatism of dolomite and graniteporphyry dyke,with the dike having undergone mineralization,and the ore body and rock changed into a gradual transition relation.In the area the ore controlling fault is obvious and the outstanding tectonic direction is the NNE.Zhangjiapingzi shear schistosity alteration zone is the only host and ore-forming structure,strictly controlling the formation of gold ore deposit and the ore body output.Through the C,O,H,S stable isotope and fluid inclusion studies,it was found that metamorphic water is the main hydrothermal mineralization medium and there are some magmatic water,with the characteristics of mantle material source for mineralization.The main metallogenic period is 25 Ma.Mineralization temperature is concentrated in 200-280 ℃ and mineralization depth focus is 1.5-2.4 km,proving it to belong to the epithermal gold deposit.
Zhangjiapingzi gold deposit is located in the West Mianning county gold concentration area and the ore bodies are hosted in the middle Triassic fifth layer(T2~(3-5)) near the metasomatism of dolomite and graniteporphyry dyke,with the dike having undergone mineralization,and the ore body and rock changed into a gradual transition relation.In the area the ore controlling fault is obvious and the outstanding tectonic direction is the NNE.Zhangjiapingzi shear schistosity alteration zone is the only host and ore-forming structure,strictly controlling the formation of gold ore deposit and the ore body output.Through the C,O,H,S stable isotope and fluid inclusion studies,it was found that metamorphic water is the main hydrothermal mineralization medium and there are some magmatic water,with the characteristics of mantle material source for mineralization.The main metallogenic period is 25 Ma.Mineralization temperature is concentrated in 200-280 ℃ and mineralization depth focus is 1.5-2.4 km,proving it to belong to the epithermal gold deposit.
引文
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[18]王登红,王成辉,陈毓川,等.贵州低温热液型汞、锑、金矿床成矿谱系:以晴隆大厂、兴仁紫木凼和铜仁乱岩塘为例[J].大地构造与成矿学,2012,36(3):330-336.
[19]江思宏,聂凤军,张义,等.浅成低温热液型金矿床研究最新进展[J].地学前缘,2004,11(2):401-409.
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[24]杨立强,邓军,赵凯,等.滇西大坪金矿床地质特征及成因初探[J].岩石学报,2011,27(12):3800-3809.
[25]赖绍民.扬子地台西南缘铜金铅锌银成矿预测研究[C]//骆耀南.扬子地台西南缘陆内造山带地质与矿产论文集.成都:四川科学技术出版社,1 996.
[26]辛存林,孙柏年,王碧喜.甘肃省两当县金厂沟微细浸染型金矿地质特征及成因探讨[J].兰州大学学报:自然科学版,2003,39(4):98-103.
[27]辛存林,孙现辉,陈世伟,等.新疆西准噶尔扎合金矿地质特征及成因[J].兰州大学学报:自然科学版,2012,48(2):48-51.
(1)四川省地矿局物探队,1:50 000里庄福地质调查报告[R].2000.
(2)四川省核工业地质局二八一大队.张家坪子金矿矿化富集特征规律[R].2013.
(2)四川省核工业地质局二八一大队.张家坪子金矿矿化富集特征规律[R].2013.
(1)四川省地矿局物探队.1:50 000里庄福地质调查报告[R].2000.
(3)攀西地质大队.茶铺子金矿成矿控制因素和金的富集规律专题报告[R].1986.
[2]兰青.张家坪子金矿床地质特征初探[J].陕西地质,2013,3 1(2):53-58.
[3]徐志刚,陈毓川,王登红,等.中国成矿区带划分方案[M].北京:地质出版社,2008.
[4]李文昌,潘桂堂.西南三江多岛弧盆-碰撞造山成矿理论与勘查技术[M].北京:地质出版社,2010.
[5]曾道龙.四川金矿床类型及区域分布规律[J].四川地质学报,1999,1 0(3):1 73-1 85.
[6]张志斌,程万华,康亚龙,等.四川锦屏山地区二金矿床的成矿机理和成因探讨[J].沉积与特提斯地质,2013,33(3):94-100.
[7]许志琴,杨经绥,李化启,等.中国大陆印支碰撞造山系及其造山机制[J].岩石学报,2012,28(6):1697-1708.
[8]许志琴,侯立玮,王宗秀.中国松潘-甘孜造山带的造山过程[M].北京:地质出版社,1992.
[9]祖辅平.中国东南部晚古生代以来典型盆地沉积构造环境演化特征[D].南京:南京大学地球科学与工程学院,2012.
[10]田世洪,丁悌平,毛景文.四川牦牛坪稀土矿床地幔流体成矿的碳、氢、氧、硫同位素证据[J].地球学报,2003,24(6):543-547.
[11]阳正熙,Anthony E W,蒲广平.四川冕宁牦牛坪稀土矿床地质特征[J].矿物岩石,2000,20(2):28-34.
[12]田世洪,侯增谦,袁忠信,等.四川术落寨稀土矿床成岩成矿的~(40)Ar-~(39)Ar年代学研究[J].岩石学报,2006,24(6):543-547.
[13]张勇,王翠仙,罗学辉,等.内蒙古巴彦温多尔金矿床韧性剪切带特征及成矿机制[J].黄金科学技术,2013,21(4):20-25.
[14]刘斌,段光贤.NaCl-H_2O溶液包裹体的密度式和等容式极其应用[J].矿物学报,1 987,7(4):345-352.
[15]Potter R W,Clynne M A,Brown D L.Freezing point depression of aqueous sodium chloride solutions[J].Economic Geology,1978,73(2):284-285.
[16]Haas J L.Physical properties of the coexisting phases and thermoehemical properties of the H_2O Component in Boiling NaCl Solution[J].US Geol Survey Bull,1976,1421A:1-73.
[17]韦延光,王建国,邓军,等.山东谢家沟金矿流体包裹体研究及其地质意义[J].现代地质,2005,19(2):224-230.
[18]王登红,王成辉,陈毓川,等.贵州低温热液型汞、锑、金矿床成矿谱系:以晴隆大厂、兴仁紫木凼和铜仁乱岩塘为例[J].大地构造与成矿学,2012,36(3):330-336.
[19]江思宏,聂凤军,张义,等.浅成低温热液型金矿床研究最新进展[J].地学前缘,2004,11(2):401-409.
[20]侯增谦,田世洪,谢玉玲,等.川西冕宁-德昌喜马拉雅期稀土元素成矿带:矿床地质特征与区域成矿模型[J].矿床地质,2008,27(2):145-173.
[21]Rollison H R.岩石地球化学[M].杨学明,杨晓勇,陈双喜,等译.安徽:中国科学技术大学出版社,2000.
[22]Hoefs A.Stable isotope geochemistry[M].Berlin:Springer-Verlag Berlin,1997.
[23]Kajiwara Y,Krouse H R.Sulfur isotope partitioning in meta-llie sulfide system[J].Canadian J Earth 1 Sci,1971,8:1397-1408.
[24]杨立强,邓军,赵凯,等.滇西大坪金矿床地质特征及成因初探[J].岩石学报,2011,27(12):3800-3809.
[25]赖绍民.扬子地台西南缘铜金铅锌银成矿预测研究[C]//骆耀南.扬子地台西南缘陆内造山带地质与矿产论文集.成都:四川科学技术出版社,1 996.
[26]辛存林,孙柏年,王碧喜.甘肃省两当县金厂沟微细浸染型金矿地质特征及成因探讨[J].兰州大学学报:自然科学版,2003,39(4):98-103.
[27]辛存林,孙现辉,陈世伟,等.新疆西准噶尔扎合金矿地质特征及成因[J].兰州大学学报:自然科学版,2012,48(2):48-51.
(1)四川省地矿局物探队,1:50 000里庄福地质调查报告[R].2000.
(2)四川省核工业地质局二八一大队.张家坪子金矿矿化富集特征规律[R].2013.
(2)四川省核工业地质局二八一大队.张家坪子金矿矿化富集特征规律[R].2013.
(1)四川省地矿局物探队.1:50 000里庄福地质调查报告[R].2000.
(3)攀西地质大队.茶铺子金矿成矿控制因素和金的富集规律专题报告[R].1986.
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