【摘要】：桐柏-大別山地區(qū)位于華北地塊和揚(yáng)子地塊之間,是秦嶺復(fù)合造山帶的東延部分,以桐柏-商城和新城-浠水一級(jí)剪切帶為界,平行造山帶走向分為北淮陽(yáng)、桐柏-大別褶皺帶(大別山)和隨州-宿松-張八嶺三個(gè)構(gòu)造單元。區(qū)域上已探明十余個(gè)大中型金(銀)礦床。石人寨研究區(qū)位于南大別山,大地構(gòu)造位置處于郯廬斷裂帶與襄樊-廣濟(jì)斷裂帶交匯所形成的三角形破碎區(qū)的北部。區(qū)內(nèi)金礦床(點(diǎn))分布較多,規(guī)�；旧隙紴樾⌒偷V床。本文依托2014年湖北省蘄春縣石人寨礦區(qū)1:10000地質(zhì)礦產(chǎn)調(diào)查最新成果,在簡(jiǎn)要分析了區(qū)域地質(zhì)及成礦背景的基礎(chǔ)上,通過(guò)對(duì)石人寨金礦床的地質(zhì)、流體包裹體、地球化學(xué)等特征的研究,并與區(qū)域典型金礦床成礦特征進(jìn)行對(duì)比,確定主要控礦因素及控礦特征,分析成礦流體性質(zhì),討論了成礦物質(zhì)來(lái)源及礦床成因,初步建立了成礦模式。結(jié)合研究區(qū)地質(zhì)及化探成果,總結(jié)區(qū)域上金的富集規(guī)律,確定了找礦有利區(qū)帶。主要取得了以下幾點(diǎn)認(rèn)識(shí):1.確認(rèn)了研究區(qū)內(nèi)兩條重要的剪切帶(劉河剪切帶和蓮花剪切帶)的地質(zhì)特征,發(fā)現(xiàn)區(qū)內(nèi)大部分巖體、巖脈、石英脈和含金石英脈都按照剪切帶展布,說(shuō)明了剪切帶是該地區(qū)巖體和金礦產(chǎn)出的主要控制因素。2.通過(guò)對(duì)石人寨地區(qū)剪切帶的分布、規(guī)模和變形特征的研究,認(rèn)為研究區(qū)內(nèi)的剪切帶總體以脆韌性變形為主。根據(jù)各變形組構(gòu)的交切、穿插、復(fù)合疊加關(guān)系等幾何學(xué)、運(yùn)動(dòng)學(xué)特征,并結(jié)合區(qū)域構(gòu)造,將剪切帶的構(gòu)造演化期次分為三期,討論了其控礦的機(jī)理,認(rèn)為在剪切帶脆韌性階段,區(qū)域上金進(jìn)行了初步富集。3.對(duì)石人寨金礦床成礦期次進(jìn)行研究,將成礦階段分為:黃鐵礦-石英階段,石英-多金屬硫化物階段和碳酸鹽-重晶石階段,其中第二階段是Au形成的主要時(shí)期。通過(guò)對(duì)含金石英脈的流體包裹體分析,認(rèn)為成礦物質(zhì)來(lái)源于流體對(duì)圍巖的萃取和深部物質(zhì)。成礦流體屬CO2-H2O±N2±H2±CH4體系,性質(zhì)為變質(zhì)水與巖漿期后熱液混合多成因型。4.與區(qū)域上典型金礦床的大地構(gòu)造背景、礦床地質(zhì)特征、成礦流體性質(zhì)的分析對(duì)比,表明石人寨金礦床的成因?qū)僦袦\成中溫?zé)嵋菏⒚}型金礦,類似伸展造山型金礦。5.根據(jù)本文對(duì)石人寨金礦床地質(zhì)特征和控礦因素的研究,結(jié)合區(qū)內(nèi)地質(zhì)、化探資料,認(rèn)為馬家灣地區(qū)具有一定的成礦潛力。
[Abstract]:The Tongba-Dabie Mountain area is located between the North China block and the Yangtze block. It is the eastward extension of the Qinling complex orogenic belt. The parallel orogenic belt is divided into North Huaiyang along the lines of Tongbai Shangcheng and Xincheng Xishui first-order shear zones. Tongbai-Dabie fold belt (Dabie Mountain) and Suizhou-Susong-Zhangbaling three tectonic units. More than ten large and medium-sized gold (silver) deposits have been discovered in the region. The study area of Shirenzhai is located in the South Dabie Mountains and the tectonic position is in the north of the triangle fracture zone formed by the intersection of the Tanlu fault zone and the Xiangfan-Guangji fault zone. There are many gold deposits (points) in this area, and the scale is basically small deposits. Based on the latest survey results of 1: 10000 geological and mineral resources in Shirenzhai mining area, Qichun County, Hubei Province in 2014, and on the basis of a brief analysis of regional geology and metallogenic background, the geological and fluid inclusions of Shirenzhai gold deposit are analyzed in this paper. The main ore-controlling factors and ore-controlling characteristics are determined, the ore-forming fluid properties are analyzed, the source of ore-forming material and the genesis of the deposit are discussed, and the metallogenic model is preliminarily established. Combined with the geological and geochemical exploration results in the study area, the enrichment law of gold in the region is summarized, and the favorable ore prospecting zone is determined. The main points are as follows: 1. The geological characteristics of two important shear zones (Liuhe shear zone and Lianhua shear zone) in the study area are confirmed. It is found that most of the rock masses, veins, quartz veins and gold-bearing quartz veins are distributed according to the shear zone, The shear zone is the main controlling factor of rock mass and gold deposit in this area. Through the study of the distribution, scale and deformation characteristics of shear zone in Shirenzhai area, it is considered that the main shear zone in the study area is brittle and ductile deformation. According to the geometries and kinematics characteristics of each deformed fabric, such as intersecting, interweaving, composite superposition, and combining with regional tectonics, the tectonic evolution stages of the shear zone are divided into three stages. The mechanism of ore-controlling is discussed, and it is considered that in the brittleness stage of the shear zone, The gold in the region was preliminarily enriched. The metallogenic stages of Shirenzhai gold deposit are studied. The metallogenic stages are divided into pyrite-quartz stage, quartz-polymetallic sulfide stage and carbonate-barite stage. The second stage is the main stage of Au formation. By analyzing the fluid inclusions of gold bearing quartz veins, it is concluded that the ore-forming materials are derived from fluid extraction of surrounding rock and deep materials. The ore-forming fluid belongs to the CO2-H2O 鹵N2 鹵H2 鹵CH4 system, which is characterized by multi-genetic mixing of metamorphic water and post-magmatic hydrothermal fluid. Comparing with the tectonic setting, geological characteristics and ore-forming fluid properties of typical gold deposits in the region, it is shown that the origin of Shirenzhai gold deposit belongs to medium-shallow hydrothermal quartz vein type gold deposit, similar to extensional orogenic type gold deposit .5. Based on the study of geological characteristics and ore-controlling factors of Shirenzhai gold deposit, combined with geological and geochemical data in the area, it is considered that the Majiawan area has a certain metallogenic potential.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.51

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