云南白秧坪银多金属矿集区成矿流体特征及成矿机制
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摘要
云南白秧坪银多金属矿集区是滇西兰坪盆地内新发现的矿集区,属东特提斯—喜马拉雅成矿域的一部分。通过流体包裹体的类型、均一温度和盐度的研究分析,结合流体包裹体的化学成分和C、H、O同位素资料及成矿地质条件的综合分析,提出流体包裹体主要具有盆地沉积卤水及大气降水的特征,但成矿流体具有壳幔混合来源的特征。这些特征与该区特定的地质背景和演化历史密切相关。兰坪盆地是在澜沧江和金沙江两条深大断裂之间发展起来的一个拉分盆地,这两条深断裂连同盆地中央的中轴断裂,不仅控制了盆地的发生和发展过程,而且也控制了盆地内成矿流体的来源及银、铜等多金属矿床的成矿作用。因此认为成矿作用是流体混合作用、有机质和膏盐地层的还原作用等综合作用的结果。
Baiyangping Ag and polymetallic mineralization concentration area is located in the northern part of Lanping Basin, western Yunnan Province. Geotectonically, this area is in the northern sector of LanpingSimao metallogenic belt, which belongs to Eastern TethyanHimalayan metallogenic domain. Baiyangping Ag and polymetallic mineralization concentration area is also a new discovered and very prospective area. This paper mainly studies the metallogenic fluids and provides the information about the homogenization temperature,salinity,fluid chemical and H,O isotopic compositions and characteristics, related to mineralization, and discusses about metallogenic mechanism and conditions. According to the detailed studies on the fluid inclusions and H, O isotopes of the gangue minerals and ore minerals collected from representative ore deposits and/or mineralization spots of Baiyangping Ag and polymetallic mineralization concentration area,the conclusions are as follows: (1)The fluid inclusions are mainly a sedimentary brine and meteorological water in the Baiyangping area,but the chemical and H,O isotopic compositions of the fluid inclusions show that deepseated fluids coming from mantle took part in the mineralization. Therefore,the mineralization fluid is a mixing fluid and metal elements formed ore deposits have also multisources;(2)The mineralization of Baiyangping Ag and polymetallic mineralization concentration area is a result of fluid mixing and reduction of organic material and gypsumsalt.
Baiyangping Ag and polymetallic mineralization concentration area is located in the northern part of Lanping Basin, western Yunnan Province. Geotectonically, this area is in the northern sector of LanpingSimao metallogenic belt, which belongs to Eastern TethyanHimalayan metallogenic domain. Baiyangping Ag and polymetallic mineralization concentration area is also a new discovered and very prospective area. This paper mainly studies the metallogenic fluids and provides the information about the homogenization temperature,salinity,fluid chemical and H,O isotopic compositions and characteristics, related to mineralization, and discusses about metallogenic mechanism and conditions. According to the detailed studies on the fluid inclusions and H, O isotopes of the gangue minerals and ore minerals collected from representative ore deposits and/or mineralization spots of Baiyangping Ag and polymetallic mineralization concentration area,the conclusions are as follows: (1)The fluid inclusions are mainly a sedimentary brine and meteorological water in the Baiyangping area,but the chemical and H,O isotopic compositions of the fluid inclusions show that deepseated fluids coming from mantle took part in the mineralization. Therefore,the mineralization fluid is a mixing fluid and metal elements formed ore deposits have also multisources;(2)The mineralization of Baiyangping Ag and polymetallic mineralization concentration area is a result of fluid mixing and reduction of organic material and gypsumsalt.
引文
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[2] 田洪亮.兰坪白秧坪铜银多金属矿床地质特征[J].云南地质,1997,16(1):105—108.
[3] 田洪亮.兰坪三山多金属矿床地质特征[J].云南地质,1998,17(2):199—206.
[4] 阙梅英,程敦模,张立生,等.兰坪—思茅盆地铜矿床[M].北京:地质出版社,1998.1—27.
[5] 徐启东,莫宣学."三江"中段新特提斯阶段区域流体的性质与状态[J].岩石学报,2000,16(4):639—648.
[6] 肖荣阁,陈卉泉,袁见齐.云南中新生代地质与矿产[M].北京:海洋出版社,1993.126—162.
[7] 张理刚.中国东部现代和中生代大气降水氢氧同位素地球化学[A].国际地质学术交流论文集[C].北京:地质出版社,1985.71—82.
[8] 薛春纪,王登红,杨建民,等.兰坪金顶—白秧坪成矿流体中发现地幔He———壳幔流体成矿证据[J].地球学报,1999,20(增刊):385—389.
[9] 李峰.兰坪盆地西缘铜矿床流体包裹体研究及找矿意义[J].昆明工学院学报,1993,18(3):221—229.
[10] 李峰,甫为民,李雷.滇西红层铜矿区域成矿物质来源[J].云南地质,1997,16(1):1—12.
[11] 张乾.云南金顶铅锌矿Pb同位素组成及Pb来源探讨[J].地质与勘探,1993,29(5):21—28.
[12] 龚文君,谭凯旋,李小明,等.兰坪白秧坪铜银多金属矿床流体地球化学特征及成矿机制探讨[J].大地构造与成矿学,2000,24(2):175—180.
[13] 薛春纪,杨建明,陈毓川,等.兰坪白秧坪Cu Ag Co多金属成矿学特征[A].陈毓川,王登红.喜马拉雅期内生成矿作用研究[C].北京:地震出版社,2000.51—62.
[14] 薛春纪,陈毓川,杨建明,等.兰坪盆地成矿流体性质:氧、碳同位素制约[J].矿床地质,2002,21(增刊):1064—1067.
[15] 滕彦国,刘家铎,张成江,等.兰坪盆地深源流体成矿的地质—地球化学信息[J].地质找矿论丛,2000,15(4):314—319.
[16] 刘建明,刘家军.盆地流体及成矿作用评述[A].欧阳自远.世纪之交矿物岩石地球化学的回顾与展望[C].北京:原子能出版社,1998.384—389.
[17] 刘家军,李朝阳,潘家永,等.兰坪—思茅盆地砂页岩中铜矿床同位素地球化学[J].矿床地质,2000,19(3):224—234.
[18] 侯增谦,卢纪元,李纪阳,等.中国西南特提斯构造演化幔柱构造控制[J].地球学报,1996,17(4):439—453.
[19] 黄朋,唐菊兴,顾雪祥,等.地幔柱构造与成矿作用———以兰坪盆地为例[J].云南地质,1999,18(4):425—430.
[20] 刘家军,李朝阳,杨伟光,等.滇西金满铜矿床中木质结构及其成因意义[J].中国科学(D辑),2001,31(2):89—95.
[21] KirkhamRV.Thedistribution,settingsandgenesisofsedimentstratiformcopperdeposits[J].GeolAssocCanSpec,1989,36:3—38.
[22] 刘家军,李志明,刘玉平,等.滇西金满脉状铜矿床成矿年龄讨论[J].现代地质,2003,17(1):34—39.
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