梁河锡矿床地质特征及成因探讨

【作者】 徐恒；

【导师】 李元；

【作者基本信息】 昆明理工大学 ， 矿产普查与勘探， 2007， 硕士

【摘要】 梁河来利山锡矿床是滇西锡矿带西亚带的主要的矿床类型之一。该矿床位于印度板块与欧亚板块碰撞带前缘的腾冲—梁河弧形构造的转折部位,东邻三江构造带。矿床与喜山期的花岗岩岩浆活动有着密切的时空关系和成因联系,经过热液作用形成了由老熊窝、淘金处、三个洞矿段组成的矿化富集区。经过野外地质调研和收集前人的资料,综合分析研究了组成矿床的矿体形态、规模和产状,矿石的类型、结构构造、矿石成分、围岩蚀变,通过对矿床的微量元素、流体包裹体及同位素地球化学等的研究,成矿以交代作用为主,表明成矿物质来源于喜山期花岗岩,矿床属于与花岗岩岩浆活动有关的热液矿床。通过野外地质调研和室内综合分析研究,取得以下成果:1、通过对来利山锡矿成矿地质条件的研究,成矿物质主要来源于喜山期的花岗岩,在成矿作用过程中,围岩中也有部分锡进入成矿流体,从而为成矿提供了物质基础。矿床属于黄铁矿—云英岩型热液矿床。2、成矿严格受构造控制,他不仅是成矿流体的运移的通道,也是成矿物质沉淀的场所。3、直接找矿标志为:铁帽,云英岩化、黄铁矿化、硅化和褪色蚀变;间接标志为受花岗岩外接触带中北东向构造破碎带控制的石炭系中统丝光坪组上段（C₂s²）地层;化探及重砂异常。4、大致指出了三个有利的成矿地段为:三个洞南部—老熊窝矿段的北部、潘家坟—淘金处之间和白沙坡—蛇洞一带。更多还原

【Abstract】 The Lianghe Lailishan tin ore deposit is a main deposit type in the western subzone of the Western Yunnan tin ore zone. This ore deposit is located at the transition spot of Tengchong-lianghe arc structure,that ramed east neighbour three rivers’ structure belt,which is in the preceding plart of the Indian and Eurasia tectonic plates’ collision belt. There are close time and space relations and origin relation between the ore deposit and the granitic magma activity of the Ximalaya mountain time, formed after the hydrothermal process by the Laoxiongwo, has panned for Taojinchu the mineralization which place, Sangedong ore section was composed to concentrate the area.Investigates and studies after the open country geology and collects predecessor’s material, the generalized analysis has studied the composition ore deposit ore body shape, the scale and produces the shape, the ore type, the structure structure, the ore ingredient, the adjacent formation alteration, through the research of the ore deposit trace element, the fluid inclusion , the isotope geochemistry and so on, the mineralization metasomatosis primarily, indicated that the mineralization material originates from the Ximalaya mountain time granite, the ore deposit belongs to the granitic magma activity related hydrothermal deposit.Through the open country geology investigation and indoor generalized analysis and research, we obtain the following result:1st, through the research of Lai Li mountain tin ore mineralization geological condition, the mineralization material main origin in Ximalaya mountain time granite, in the mineralization process, a part of tin in the adjacent formation also has also enter the mineralization fluid, thus has provided the material base for the mineralization.The deposit belongs to the Pyrite—Mica quartz hot liquid deposit.2nd, the mineralization is strictly controled by structure, it is not only a passage for mineralization fluid migration, but also the place where the mineralization material precipitates.3rd, the direct prospecting symbol is: The chapeau de fer, the mica-quartz lithification, the pyrite mineralize, the silicification and the discoloration alteration; The indirect symbol is C₂s² stratum ,it is controlled by the granite outside contact strip north east to the structure crushed zone; geochemistry explore and placer abnormal.4th, there are three advantageous mineralization target areas have been irised approximately: South part of Sangedong-north part of the Laoxiongwo ore section, the area between Panjiafen and Taojinchu, the region of Baishapo-Shedong.更多还原