發(fā)布時間：2018-04-18 02:09

  本文選題：金礦床 + 地質(zhì)特征��； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：火峰埡金礦床位于勉略寧地區(qū),是陜西有名的“金三角”,區(qū)內(nèi)礦產(chǎn)資源豐富,其東部地區(qū)已發(fā)現(xiàn)多個中—大型金多金屬礦床,特別是金礦的發(fā)現(xiàn),體現(xiàn)了該區(qū)良好的金礦找礦前景。本文以礦床學(xué)為基礎(chǔ),在對礦區(qū)進行詳細的野外地質(zhì)調(diào)研和大量的前人資料綜合整理的前提下,采用搜集研讀前人工作資料、野外地質(zhì)調(diào)查、室內(nèi)分析等工作手段,在區(qū)域地質(zhì)背景、礦區(qū)地質(zhì)特征、礦體特征研究的基礎(chǔ)上,對火峰埡地區(qū)金礦的控制因素進行了分析,得到如下結(jié)論:通過大量礦區(qū)地質(zhì)調(diào)查結(jié)合區(qū)域金礦研究成果認為,火峰埡金礦床的成因類型屬海相火山沉積—后期構(gòu)造熱液型金礦床。大量勘探成果表明,礦體主要是受地層、巖性及韌性剪切構(gòu)造控制,個數(shù)多,規(guī)模小,呈脈狀,分段集中,平行斜列產(chǎn)出。礦體受后期構(gòu)造裂隙的控制,金礦體產(chǎn)狀與地層產(chǎn)狀呈20°~50°斜交,礦體傾角較陡。通過大量礦體地質(zhì)特征研究,礦體主要有石英脈型金礦石和細碧巖型金礦石,以石英脈型為主。地層控制了礦體的產(chǎn)出。Pt2-3Bk22-2b層為中基性火山巖建造。該層中金元素異常明顯,金元素含量高,是區(qū)內(nèi)重要的礦源層和含金母巖。金礦體受巖性控制的特征也較明顯,均為糜棱巖化細碧巖。在結(jié)合區(qū)域成礦背景、區(qū)域構(gòu)造演化史及礦區(qū)構(gòu)造特征的基礎(chǔ)上認為,構(gòu)造剪切帶是良好的導(dǎo)礦、容礦通道。晉寧期皺變形,形成成為良好的礦液通道,為后期成礦奠定了基礎(chǔ);澄江期發(fā)生強烈的擠壓事件,形成良好的礦液通道;侵入大量的基性—中酸性巖體、巖脈,為成礦物質(zhì)的活化遷移提供了良好的動熱條件。深部的糜棱巖化作用使得Au等組分及其它成礦元素一起被活化分異形成含礦熱液;近地表的不同部位形成相應(yīng)蝕變糜棱巖型、構(gòu)造蝕變巖型和石英脈型金礦化,從而造成不同類型金礦化的疊加。巖漿活動提供了部分成礦物質(zhì)來源,并促使了后期元素的富集成礦。古大陸裂解時期,中—基性巖體的侵入,為本區(qū)內(nèi)生金屬礦床的形成奠定了成礦物質(zhì)基礎(chǔ)。巖漿上侵活動帶來的熱能可使巖體的圍巖中的溶液升溫,成礦物質(zhì)發(fā)生活化,直接形成或參與形成成礦溶液,然后運移、富集成礦。通過礦區(qū)內(nèi)找礦標志研究認為,金礦體與石英脈密切相關(guān),特別是北北東向一組石英脈與礦化關(guān)系最為密切。圍巖蝕變與金礦化密不可分,而黃鐵礦化與金礦化關(guān)系則更為密切,黃鐵礦含量多少直接決定金礦體品位的高低變化,是尋找金礦體重要標志。糜棱巖化細碧巖是尋找含金蝕變細碧巖的間接標志。片理化帶及其次一級構(gòu)造發(fā)育地段及見有石英脈斜切地層,產(chǎn)狀急劇變化地段是金富集的有利部位。
[Abstract]:The Huofengya gold deposit is located in the Mianliuoning area and is a famous "golden triangle" in Shaanxi Province. The area is rich in mineral resources. In the eastern part of the area, many medium-large gold polymetallic deposits, especially gold deposits, have been discovered.It reflects the good prospect of gold prospecting in this area.On the basis of ore deposit science, on the premise of detailed field geological investigation and comprehensive collation of a large number of previous data, this paper adopts the working methods of collecting and studying previous work data, field geological survey, indoor analysis and so on.Based on the study of regional geological background, geological characteristics of mining area and orebody characteristics, the controlling factors of gold deposit in Huofengya area are analyzed. The conclusions are as follows: through a large number of geological surveys of mining areas combined with regional gold ore research results, it is considered that,The genetic type of Huofengya gold deposit is marine volcanic sedimentary-late tectonic hydrothermal gold deposit.A great deal of exploration results show that the orebodies are mainly controlled by strata lithology and ductile shear structures with large number small scale vein shape segmental concentration and parallel oblique production.The orebody is controlled by the late structural fissures. The occurrence of gold orebody is 20 擄/ 50 擄oblique, and the dip angle of the orebody is steep.Through the study of the geological characteristics of a large number of orebodies, the orebodies mainly consist of quartz vein type gold ore and fine blue rock type gold ore, mainly quartz vein type.The formation controls the formation of the orebody. Pt2-3Bk22-2b is a medium-basic volcanic rock formation.It is an important source bed and mother rock of gold bearing in this area, because of the obvious anomaly of gold elements and the high content of gold elements.The characteristics of gold orebodies controlled by lithology are also obvious, they are mylonitic fine-blue rocks.On the basis of the regional metallogenic background, the history of regional tectonic evolution and the structural characteristics of the mining area, it is considered that the tectonic shear zone is a good ore-conducting and ore-accommodating channel.In Jinning period, it was wrinkled and deformed and formed into a good ore-liquid channel, which laid a foundation for late mineralization. In Chengjiang period, a strong extruding event formed a good ore-liquid channel, and intruded into a large number of basic-intermediate-acid rock masses and veins.It provides a good dynamic thermal condition for the activation and migration of ore-forming materials.The deep mylonitization causes au and other metallogenic elements to be activated and differentiated together to form ore-bearing hydrothermal solution, and the corresponding altered mylonite type, tectonic altered rock type and quartz vein type gold mineralization are formed in different parts near the surface.This results in the superposition of different types of gold mineralization.Magmatic activity provides a partial source of ore-forming materials and promotes the enrichment of elements in the late stage.During the pyrolysis of the Paleocontinent, the intrusions of the meso-basic rock bodies established the ore-forming basis for the formation of the endogenic metal deposits in this area.The thermal energy brought by the magmatic intrusion can heat up the solution in the surrounding rock mass, activate the ore-forming material, directly form or participate in the formation of the ore-forming solution, and then migrate and enrich the ore-forming solution.It is considered that gold ore body is closely related to quartz vein, especially a group of quartz veins in NNE direction, which is most closely related to mineralization.The alteration of surrounding rock is closely related to gold mineralization, while pyrite mineralization is more closely related to gold mineralization. The content of pyrite directly determines the change of gold ore body grade, which is the mark of seeking gold ore body weight.Mylonitization is an indirect sign of seeking gold-bearing altered rock.The sheet physicochemical belt and its secondary tectonic development area and quartz-vein oblique cut strata are favorable for gold enrichment.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.51

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