【摘要】：漢陰北部山區(qū)地處南秦嶺印支褶皺造山帶南部,出露一套下志留統(tǒng)梅子埡組淺變質(zhì)含炭泥質(zhì)碎屑巖,已發(fā)現(xiàn)的金礦帶自石泉縣羊坪灣-漢陰縣黃龍-漢濱區(qū)流芳,東西長(zhǎng)約100km、南北寬約10~20km,為一大型的金礦化集中區(qū)。論文通過對(duì)漢陰北部地區(qū)吳家灣金礦床地質(zhì)特征研究,以石英脈流體包裹體為研究對(duì)象,開展均一法測(cè)溫、激光拉曼探針原位成分分析,探討吳家灣金礦床成礦流體的性質(zhì);通過漢陰北部吳家灣地區(qū)控礦因素研究,總結(jié)了該地區(qū)的控礦構(gòu)造模型和找礦標(biāo)志,提出吳家灣金礦床的礦床成因。主要取得以下進(jìn)展和成果:(1)通過對(duì)漢陰北部吳家灣地區(qū)梅子埡組地層中巖石變質(zhì)礦物(黑云母-石榴石地質(zhì)溫度計(jì))及巖石主要礦物組合(黑云母+石英+白云母+綠泥石±石榴石)的研究,提出該區(qū)巖石變質(zhì)程度主要為低綠片巖相,局部可達(dá)高綠片巖相。(2)吳家灣金礦區(qū)的礦體分布于絹云石英片巖與硅質(zhì)巖帶的巖性分界面附近,受脆韌性斷裂構(gòu)造控制明顯;主要的找礦標(biāo)志為黃鐵礦化、硅化等。(3)吳家灣金礦床成礦流體的均一溫度主要在230~280℃,成礦流體的鹽度集中在2~10wt%(NaCleq),表現(xiàn)為中低溫、低鹽度特征;計(jì)算得到成礦密度為0.62~0.93g/cm3,成礦壓力為38.04~95.38MPa,礦化深度在1.38~3.47km,屬中-淺層次成礦深度范圍。流體包裹體以CO2-H2O體系為主,成礦流體具有低鹽度、富CO2特征。(4)通過對(duì)吳家灣金礦床區(qū)域大地構(gòu)造背景、礦床成礦特征以及流體包裹體地球化學(xué)的研究,認(rèn)為該礦床類似于造山型金礦床。
[Abstract]:The northern mountainous area of Hanyin is located in the south of the Indosinian fold orogenic belt in the South Qinling Mountains. A set of shallow-metamorphosed carbonaceous muddy clastic rocks of the MeiZiya formation of Lower Silurian have been exposed. The gold belt has been discovered from Liufang, Yangping Bay, Shiquan County, Huanglong and Hanbin areas, Hanyin County, China. The east-west is about 100 km, and the north and south is about 10 ~ 20 km, which is a large gold mineralization concentration area. Based on the study of the geological characteristics of the Wujiawan gold deposit in the northern part of Hanyin, taking the fluid inclusions of quartz vein as the research object, homogenizing temperature measurement and in-situ composition analysis with laser Raman probe are carried out to study the ore-forming fluid properties of the Wujiawan gold deposit. Based on the study of ore-controlling factors in Wujiawan area in northern Hanyin, this paper summarizes the ore-controlling structure model and prospecting criteria in this area, and puts forward the genesis of the Wujiawan gold deposit. The main achievements are as follows: (1) the rock metamorphic minerals (biotite-garnet geological thermometer) and the main rock mineral assemblages (biotite quartz dolomite) in the Meiziya formation of Wujiawan area in northern Hanyin are studied. Mother chlorite + garnet), It is suggested that the metamorphic degree of the rocks in this area is mainly low greenschist facies, and the high greenschist facies can be obtained locally. (2) the orebodies of the Wujiawan gold deposit area are distributed near the lithologic interface between the sericite quartz schist and the siliceous rock belt, and are obviously controlled by brittle ductile fracture structure. The main prospecting criteria are pyrite and silicification. (3) the homogenization temperature of the ore-forming fluid of the Wujiawan gold deposit is mainly at 230 ~ 280 鈩，

本文編號(hào)：2224631