云南白秧坪银多金属矿集区成矿流体特征及成矿机制  

THE CHARACTERISTICS OF METALLOGENIC FLUIDS AND METALLOGENIC MECHANISM IN BAIYANGPING SILVER AND POLYMETALLIC MINERALIZATION CONCENTRATION AREA IN YUNNAN PROVINCE

作　　者：杨伟光[1] 喻学惠[1] 李文昌 董方浏 莫宣学[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]云南省地质调查院,云南昆明650011

出　　处：《现代地质》2003年第1期27-33,共7页Geoscience

基　　金：国土资源部国土资源大调查项目(20001020026003)。

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 LanpingSimao metallogenic belt, which belongs to Eastern TethyanHimalayan 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 deepseated 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 multisources;(2)The mineralization of Baiyangping Ag and polymetallic mineralization concentration area is a result of fluid mixing and reduction of organic material and gypsumsalt.

关 键 词：银多金属矿集区 成矿流体 成矿机制 云南 流体包裹体 成矿作用 成矿地质条件 

分 类 号：P618.52[天文地球—矿床学]