本文選題：青海省 + 地質(zhì)特征　； 參考：《長安大學(xué)》2015年碩士論文

【摘要】：位于青藏高原東北部同德—澤庫印支期銅、鉛、金成礦帶中的加吾金礦,是武警黃金部隊在前人工作基礎(chǔ)上,經(jīng)戰(zhàn)略地質(zhì)調(diào)查及預(yù)查工作中所發(fā)現(xiàn),并認(rèn)為經(jīng)進一步勘探工作可取得重大找礦突破。但2008-2011年武警黃金部隊在礦區(qū)進行金礦勘探工作中,施工的探槽、探坑及鉆孔見礦效果均不理想,致使對該區(qū)找礦前景產(chǎn)生質(zhì)疑。對前人成果資料進行綜合分析的基礎(chǔ)上,結(jié)合野外實際調(diào)查成果,開展了加吾金礦及所在區(qū)域的地質(zhì)地球化學(xué)特征分析,以期揭示其進一步找礦潛力。論文主要取得以下認(rèn)識:1、1:20萬區(qū)域地球化學(xué)特征研究結(jié)果表明:該區(qū)中下三疊統(tǒng)隆務(wù)河組(T1-2l)地層中,Au、W、As、Sb、Hg、Bi等元素呈相對富集狀態(tài),且離散程度較大,是具有尋找金、鎢、銻礦潛力的賦礦地層單元;區(qū)域內(nèi)元素主要分為六個組合,其中,Au-Sb-Ag-AsW-Bi-Cd-Sn組合主要反映Au的礦化富集特征,可作為研究區(qū)尋找金礦的指示元素組合;區(qū)域元素異常分布特征顯示出,中下三疊統(tǒng)隆務(wù)河組(T1-2l)與斷裂構(gòu)造對異常分布和其形態(tài)具有明顯的控制作用;區(qū)域內(nèi)共圈出綜合異常7個,其中Ht1、Ht2綜合異常反映為已知金礦體異常,尤其是加吾金礦所在Ht1綜合異常,異常規(guī)模大、強度高、濃集中心明顯、元素組合好,表明該礦區(qū)進一步找礦潛力較大。此外,Ht5綜合異常具有較好的找礦潛力,Ht3、Ht6、Ht7綜合異常有一定的找礦希望。2、礦區(qū)地質(zhì)特征顯示:礦區(qū)地層以中下三疊統(tǒng)隆務(wù)河組的一套硬砂質(zhì)長石-泥質(zhì)細碎屑巖(T1-2l1-3)為主。其中,碳質(zhì)板巖夾變質(zhì)砂巖段(T1-2l3)礦化蝕變較強,是礦區(qū)的主要賦礦層位;礦區(qū)內(nèi)構(gòu)造變形強烈,斷裂發(fā)育,NW向和EW向斷裂既是礦區(qū)主要斷裂,也是主要的控礦、容礦斷裂,并控制著礦體的產(chǎn)出;礦區(qū)巖漿巖以印支期中酸性侵入體為主,主要為花崗閃長巖體和花崗斑巖脈,均與成礦關(guān)系密切;金礦體主要產(chǎn)于碳質(zhì)板巖層間破碎帶、碳質(zhì)板巖夾砂質(zhì)板巖或碳質(zhì)板巖與花崗巖體的接觸帶上;礦石類型以碎裂蝕變巖型和石英脈型為主;礦化類型有褐鐵礦化、黃鐵礦化、毒砂礦化、輝銻礦化等;圍巖蝕變有硅化、碳酸鹽化、絹云母化等。3、礦區(qū)元素富集變化特征顯示,礦區(qū)內(nèi)元素Au、Ag、As、Sb、Pb、W、Bi、Cd的富集系數(shù)及變化系數(shù)分別達到1.27~37.86、1.81~11.19,表明這些元素呈明顯的富集狀態(tài)且分布極不均勻,表明他們在局部地段富集成礦的可能性很大;花崗斑巖、石英脈、構(gòu)造破碎帶中,Au的相對富集系數(shù)和變化系數(shù)分別達到1.41~1.30、1.68~3.32,表明這些地質(zhì)單元對金的遷移富集影響作用很大。4、礦區(qū)元素主要分為三個組合。其中,Au-Ag-As-W-Cd-Pb組合與區(qū)域上Au-Sb-AgAs-W-Bi-Cd-Sn組合相似,主要反映Au的礦化富集特征,可作為該礦區(qū)尋找金礦的指示元素組合。5、礦區(qū)稀土元素地球化學(xué)特征顯示,礦區(qū)沉積巖為正常殼源成因,與卡林型金礦圍巖稀土元素地球化學(xué)特征相似;礦區(qū)巖漿巖為陸殼俯沖作用下的產(chǎn)物,同時深部物質(zhì)(下地殼、地幔)也參與了巖漿活動;碎裂蝕變巖型礦石是地層沉積巖經(jīng)過成礦流體改造作用的產(chǎn)物,石英脈型礦石與礦區(qū)花崗閃長巖可能具有相同的物質(zhì)來源。6、礦床元素的水平分帶顯示,礦體的前暈元素為As、Sb、Hg、Ba,礦上暈元素為Au、Ag、Cu、Pb、Zn、W,尾暈元素為Cd、Bi、Mo、Ni、Co。該分帶特征同時顯示出,小曲如溝的斷裂蝕變帶下部具有良好的找礦潛力,應(yīng)該是尋找金礦的主要地段。
[Abstract]:Located in the northeastern part of the Qingzang Plateau, the gold deposits in the copper, lead and gold metallogenic belts in the Indo Zeku period of the eastern Qinghai Tibet Plateau are found on the basis of previous work on the previous work of the gold troops of the armed police force, and have been found in the work of strategic geological investigation and pre investigation. But the gold troops of the armed police force in the mining area have made gold in the mining area for 2008-2011 years. On the basis of comprehensive analysis of the data of previous achievements, the geological and geochemical characteristics of the geo gold deposit and its region are analyzed on the basis of the comprehensive analysis of the data of the previous achievements and the analysis of the geological and geochemical characteristics of the geo gold deposits and their regions in order to reveal their further prospecting. The main achievements of this paper are as follows: the results of the 1,1:20 ten thousand regional geochemical characteristics show that the elements of Au, W, As, Sb, Hg, Bi and other elements in the middle and lower three series of the middle lower strata of the area are relatively enriched and have a relatively large degree of dispersion, which are the ore bearing formation units that have the potential for gold, tungsten and antimony. The elements in the region are mainly divided into six. In combination, the Au-Sb-Ag-AsW-Bi-Cd-Sn assemblage mainly reflects the mineralization and enrichment characteristics of Au, which can be used as the indicator element combination for finding gold deposits in the study area. The anomalous distribution characteristics of regional elements show that the middle and lower three superposition of the Long Wu River group (T1-2l) and the fault structure have obvious control effect on the abnormal distribution and its morphology. There are 7 anomalies, among which Ht1 and Ht2 synthesis anomalies reflect the known gold ore body anomalies, especially the Ht1 comprehensive anomalies in the gold mine where the gold deposits are located. The anomalies are large, the intensity is high, the concentration center is obvious, and the combination of the elements is good, which indicates that the mining area has a great potential for further prospecting. In addition, the Ht5 synthesis anomaly has a good prospecting potential, Ht3, Ht6, and Ht7 have a certain comprehensive anomaly. The geological features of the ore prospecting are.2, and the geological features of the mining area show that the mining area is dominated by a set of hard sandy feldspar clay fine clastic rock (T1-2l1-3) in the middle and lower upper three series of the Long Wu River group. Among them, the carbonaceous slate metamorphic sandstone section (T1-2l3) has strong mineralization and alteration, which is the main ore bearing stratum in the mining area; the tectonic deformation is strong, the fault development, the NW direction and the EW direction fracture in the mining area. It is not only the main fault of the mining area, but also the main ore control, ore bearing fracture and controlling the output of the ore body. The magmatic rocks in the mining area are mainly the acid intrusive bodies of the Indo Chinese period, mainly the granitic diorite and granite porphyry veins, which are closely related to the mineralization, and the gold deposits are mainly produced in the fractured zone between the carbonaceous plate rocks, the carbonaceous slate sandwiched with sand and carbonaceous plates. On the contact zone of rock and granite, the ore type is mainly composed of fractured and altered rock type and quartz vein type, and the mineralization type is browning, pyrite mineralization, arsenopyrite mineralization and so on. The alteration of surrounding rock has silicification, carbonation, sericite and so on.3, and the enrichment and variation characteristics of the mineral elements show that the enrichment system of elements Au, Ag, As, Sb, Pb, W, Bi and Cd in the mining area The number and variation coefficient are 1.27~37.86,1.81~11.19 respectively, indicating that these elements are obviously enriched and are extremely uneven distribution, indicating that they are very likely to enrich the mineralization in the local area. In the granite porphyry, quartz vein and structural fracture zone, the relative enrichment coefficient and change coefficient of Au are respectively 1.41~1.30,1.68~3.32. The geological unit has a great effect on the migration and enrichment of gold, and the elements of the mining area are mainly divided into three combinations. Among them, the Au-Ag-As-W-Cd-Pb assemblage is similar to the Au-Sb-AgAs-W-Bi-Cd-Sn assemblage in the region, which mainly reflects the mineralization and enrichment characteristics of the Au, which can be used as the indicator element combination of the gold deposits in this mining area,.5, and the geochemical characteristics of the rare earth elements in the mining area display, The sedimentary rocks of the mining area are the origin of the normal crust source, which are similar to the geochemical characteristics of the rare earth elements in the Carlin type gold deposits. The magmatite in the mining area is a product of the subduction of the continental crust, while the deep substance (the lower crust, the mantle) also participates in the magmatic activity, and the fractured and altered rock type ore is the product of the formation of the sedimentary rocks through the transformation of the fluid of the ore-forming fluid. Type ore and granodiorite of mining area may have the same material source.6, and the horizontal zoning of the deposit elements shows that the halo elements of the ore body are As, Sb, Hg, Ba, and the ore halo elements are Au, Ag, Cu, Pb, Zn, and W, and the tail halo elements are shown in the same time that the lower part of the fracture alteration zone of the small curved gully has a good prospecting potential. It should be the main location for the search for gold.

【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.51

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