广西五圩箭猪坡铅锌锑多金属矿床流体包裹体及找矿预测研究

发布时间：2018-06-10 07:13

  本文选题：流体包裹体 + 元素地球化学　； 参考：《广西大学》2015年硕士论文

【摘要】：箭猪坡铅锌锑多金属矿床是丹池成矿带南东段五圩矿田中规模最大、特征最为典型的一个大型矿床,区内成矿方式以充填为主,矿体主要呈陡立脉状产出,产状和形态严格受NNW向断裂控制。此外,本次调查还新发现有缓倾斜似层状矿体。本文在对箭猪坡矿床构造特征、矿化特征等研究的基础上,重点开展了箭猪坡矿床7号、59号主矿脉以及新发现似层状矿体流体包裹体研究,最后提出了找矿方向,圈定了找矿靶区。取得的主要成果和认识如下：(1)箭猪坡矿区主要构造为NNW向五圩背斜和NNW向断裂。五圩背斜由两个次级背斜组成,沿轴向具“S型”拐弯特点；NNW向断裂是区内脉状矿体的主要控矿构造,沿走向具“S型”拐弯特点,经历了成矿前以挤压为主、兼具顺时针扭动和成矿期以拉张为主、兼具反时针扭动两期构造活动。成矿期构造运动特点导致的构造拐弯部位对成矿有利。(2)根据野外观察和室内矿相学研究,将箭猪坡矿床的成矿作用分为三个阶段：第Ⅰ阶段为黄铁矿-石英阶段,该阶段矿化较弱,金属矿物以黄铁矿为主,偶见有方铅矿；第Ⅱ阶段为铁闪锌矿-黄铁矿-辉锑矿-脆硫锑铅矿-石英-方解石-白云石阶段,该阶段为主成矿阶段,出现大量深棕色铁闪锌矿、放射状的脆硫锑铅矿、辉锑矿以及少量的黄铁矿；第Ⅲ阶段为石英-方解石阶段,石英-方解石脉中含有少量辉锑矿、脆硫锑铅矿、铁闪锌矿及黄铁矿等金属矿物。(3)箭猪坡矿床主成矿阶段流体包裹体类型主要有H2O-NaCl-CO2型、H2O-NaCl型和纯C02型等,成矿流体主要表现为中温、低盐度、富C02等特征。H2O-NaCl型包裹体完全均一温度为113-288℃、盐度w(NaCl)为3.53～8.27%、密度为0.799～0.996 g/cm3；H2O-NaCl-CO2型包裹体完全均一温度为175～328℃、盐度w(NaCl)为0.21～11.84%、密度为0.654～0.842g/cm3。出箭猪坡矿床成矿压力主要变化范围为70～90MPa,成矿深度主要为1.75～3.77 km。(4)成矿流体温度、盐度以及成矿元素的空间分布特征,提出箭猪坡矿床中部(302～304勘探线之间)为成矿中心所在部位。(5)依据矿脉空间产出特征,结合成矿期共轭节理交线产状、成矿期构造运动特征等综合判断,箭猪坡矿区矿液由北向南,由深到浅运移,矿体向NE侧伏。(6)依据本次研究认识,提出矿区中部(五圩背斜拐弯处)以及已知矿脉北部东侧为区内的两个找矿靶区。
[Abstract]:The Qianliupo lead-zinc antimony polymetallic deposit is the largest and most typical large deposit in Wuwei ore field in the south eastern section of the Danchi metallogenic belt. The ore-forming mode in the area is mainly filled, and the orebody mainly occurs in steep veins. The occurrence and morphology are strictly controlled by NNW trending faults. In addition, the investigation also found a gently inclined bedded ore body. Based on the study of the structural and mineralized characteristics of the Qianliupo deposit, this paper focuses on the study of the main vein No. 7 and No. 59 of the Qianzhoupo deposit and the fluid inclusions of the newly discovered stratiform orebody, and finally puts forward the prospecting direction. The prospecting target area has been delineated. The main achievements and understandings are as follows: 1) the main structures of Qianzhubo mining area are NNW Wuwei anticline and NNW trending faults. Wuxu anticline is composed of two secondary anticlines. The NNW fault is the main ore-controlling structure of the vein orebody along the axial direction with "S-type" bend characteristics. Both clockwise writhing and metallogenic stage are mainly extensional and counterclockwise twisting tectonic activity. On the basis of field observation and indoor mineralogical study, the mineralization of Qianzhoupo deposit is divided into three stages: the first stage is the stage of pyrite-quartz, and the other is the stage of pyrite-quartz. The mineralization in this stage is relatively weak, with pyrite as the main mineral and galena occasionally found in the metal minerals, and in the second stage is the stage of marmatite, pyrite, stibnite, brittle antimony, quartz, calcite and dolomite, and the main metallogenic stage is this stage, which is mainly composed of sphalerite, pyrite, stibnite, quartz, calcite and dolomite. A large number of dark brown marmatite, radial brittle antimony lead, stibnite and a small amount of pyrite; the third stage is the quartz-calcite stage, the quartz-calcite vein contains a small amount of stibnite, brittle antimony lead, The fluid inclusions in the main metallogenic stage of Qianzhupo deposit are mainly composed of H _ 2O -NaCl-CO _ 2 type and pure type C _ (02). The ore-forming fluids are mainly of moderate temperature and low salinity. The complete homogenization temperature of the inclusions is 113-288 鈩，

本文编号：2002403