本文選題：包裹體 + 成礦流體　； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：戈塘金礦床位于黔西南地區(qū)典型的卡林型金礦集區(qū)構(gòu)造活動(dòng)帶右江造山帶內(nèi),屬貴州安龍縣管轄。本文以角礫狀礦石中石英包裹體為研究對(duì)象,來(lái)探討礦床成礦流體的性質(zhì)與來(lái)源、成礦物質(zhì)來(lái)源、成礦流體特征,從而確定礦床成因模式。戈塘礦區(qū)出露的地層以二疊系、三疊系為主,構(gòu)造發(fā)育,以褶皺和北東向斷裂為主。礦體多呈層狀、似層狀、透鏡狀賦存于龍?zhí)督M與茅口組巖溶不整合面上的構(gòu)造蝕變體中,賦礦巖石為硅化角礫巖,圍巖蝕變以硅化為主。礦體的產(chǎn)出受層間滑脫構(gòu)造控制。礦石類型為原生礦石及氧化礦石。礦石構(gòu)造主要有角礫狀構(gòu)造、網(wǎng)脈狀構(gòu)造、細(xì)脈狀構(gòu)造、浸染狀構(gòu)造和多孔狀構(gòu)造等。礦石結(jié)構(gòu)主要有自形-半自形粒狀結(jié)構(gòu)、交代結(jié)構(gòu)、環(huán)狀結(jié)構(gòu)和包含結(jié)構(gòu)等。礦石中金屬礦物以黃鐵礦、磁黃鐵礦、毒砂、輝銻礦為主。非金屬礦物為石英、方解石、螢石、粘土礦物等。最重要的載金礦物是黃鐵礦和毒砂,其次是粘土礦物。戈塘礦床流體包裹體類型以水溶液包裹體為主,CO_2包裹體、純液相包裹體、純氣相包裹體發(fā)育較少。礦石中包裹體均一溫度波動(dòng)范圍集中在120~150℃與170~200℃范圍內(nèi),平均均一溫度146.82℃,表明戈塘金礦的主成礦期有兩個(gè)階段。包裹體冰點(diǎn)溫度波動(dòng)范圍在-3.5~-0.1℃之間,平均冰點(diǎn)溫度為-1.8℃。包裹體平均鹽度2.98wt%,為中低鹽度。成礦流體密度均值為0.95g/cm~3,成礦平均壓力366.17×10~5 Pa,推測(cè)成礦深度0.60~1.91km。成礦流體密度范圍為0.86~0.98g/cm~3,平均0.95g/cm~3,具中高密度流體特點(diǎn),平均成礦深度1.22km。戈塘金礦床表現(xiàn)為中低溫淺層熱液礦床的特點(diǎn),主成礦期與燕山晚期構(gòu)造運(yùn)動(dòng)有關(guān)。礦床成礦流體與成礦物質(zhì)來(lái)源復(fù)雜,表現(xiàn)為多源性和多期性。深部幔源以及含礦建造為主要成礦物質(zhì)來(lái)源。成礦流體來(lái)源以深部巖漿熱液為主,盆地建造水以及大氣降水也參與了成礦流體形成過(guò)程。初步建立了礦床成因模式:深部流體沿右江盆地裂解形成的深大斷裂與多期次噴發(fā)的巖漿形成混合流體向上遷移,到達(dá)“大廠層”時(shí)沿古風(fēng)化面進(jìn)入層滑構(gòu)造,并與圍巖發(fā)生交代蝕變作用,成礦后期受引張空間及破碎帶低滲透率巖石組合的影響,形成層帶型礦化,含礦物質(zhì)析出富集成礦。
[Abstract]:The Gotang gold deposit is located in the Youjiang orogenic belt of the tectonic active belt in the typical Carlin-type gold concentration area in southwest Guizhou Province, and belongs to the jurisdiction of Anlong County, Guizhou Province. In this paper, quartz inclusions in breccia ore are taken as the research object to discuss the nature and source of ore-forming fluid, the source of ore-forming material and the characteristics of ore-forming fluid, and to determine the genetic model of ore deposit. The strata exposed in Gotang mining area are Permian, Triassic, tectonic development, fold and NE faults. The orebodies are mostly layered, like layered, and lenticular in the structural alteration of karst unconformities of Longtan formation and Maokou formation. The ore-bearing rocks are silicified breccia, and the main alteration of surrounding rock is silicification. The production of ore body is controlled by interlayer slip structure. The ore type is primary ore and oxidized ore. Ore structures mainly include breccia structure, reticular vein structure, veinlike structure, disseminated structure and porous structure. The ore structure mainly consists of granular structure, metasomatic structure, annular structure and inclusion structure. Ore with pyrite, pyrrhotite, arsenopyrite, stibnite. Non-metallic minerals are quartz, calcite, fluorite, clay minerals and so on. The most important gold-bearing minerals are pyrite and arsenopyrite, followed by clay minerals. The fluid inclusions are mainly composed of aqueous solution inclusions, pure liquid inclusions and pure gas inclusions. The range of homogenization temperature of inclusions in ore is concentrated in the range of 120 ~ 150 鈩，

本文編號(hào)：1995513