本文選題：秦祁結(jié)合部　切入點(diǎn)：循化地區(qū)　出處：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：青海省循化地區(qū)處于中央造山系中段祁連造山帶與西秦嶺造山帶接合部位,在早古生代與晚古生代-早中生代經(jīng)歷了復(fù)雜、多期的構(gòu)造-巖漿-沉積作用,為多種金屬成礦作用提供了有利的地質(zhì)背景條件及成礦環(huán)境。成礦作用具有多期、多礦種和多類(lèi)型的特點(diǎn)。該區(qū)段礦種多,礦床類(lèi)型復(fù)雜,成礦時(shí)代跨度大,成礦地質(zhì)條件獨(dú)特,已發(fā)現(xiàn)了礦(化)點(diǎn)十余處,是青海省東部地區(qū)重要的金屬礦產(chǎn)地之一。論文以板塊構(gòu)造和區(qū)域成礦理論為指導(dǎo),通過(guò)實(shí)地野外考察,并結(jié)合研究區(qū)內(nèi)以往地質(zhì)礦產(chǎn)資料,開(kāi)展對(duì)循化地區(qū)區(qū)域地質(zhì)特征和成礦地質(zhì)背景研究,系統(tǒng)總結(jié)了循化地區(qū)不同地質(zhì)時(shí)期、不同動(dòng)力學(xué)背景下礦床的成礦地質(zhì)條件、控礦因素,探討其成礦地質(zhì)背景及成礦規(guī)律,指出本區(qū)的重要找礦標(biāo)志,對(duì)進(jìn)行區(qū)域成礦預(yù)測(cè)有著重要的地質(zhì)意義。主要取得以下認(rèn)識(shí)和進(jìn)展:1、對(duì)研究區(qū)內(nèi)主要含礦層位重新劃分。將區(qū)內(nèi)化隆巖群劃分為兩個(gè)巖性段,并于其中厘定出一套變火山巖系,暫歸為寒武系六道溝組;將三疊系隆務(wù)河組地層沉積組合劃分為灰?guī)r段、礫巖段、細(xì)碎屑巖段、韻律組合段、粉砂質(zhì)板巖段五段。將成礦關(guān)系密切的加里東期、印支期巖漿巖劃分為若干侵入體。2、研究區(qū)橫跨祁連、秦嶺兩大成礦帶,北部南祁連化隆微地塊以加里東期為主要的成礦期,主要發(fā)育巖漿熔離型銅鎳礦床、偉晶巖型稀有金屬、非金屬礦床,其成礦作用與俯沖地質(zhì)背景密切相關(guān)。南部西秦嶺西段北緣以印支期為主要成礦期,主要發(fā)育斑巖型、矽卡巖型、構(gòu)造蝕變巖型多金屬礦床,形成于中-晚三疊世活動(dòng)大陸邊緣向陸-陸碰撞造山的構(gòu)造轉(zhuǎn)換體制之下。3、北部南祁連化隆微地塊內(nèi)礦床主要分布在侵位于變質(zhì)地層(化隆巖群)中的鎂鐵—超鎂鐵巖帶及偉晶巖脈內(nèi),以鎂鐵—超鎂鐵巖及脈巖為直接找礦標(biāo)志;西秦嶺西段北緣礦床主要分布于中酸性巖體外圍,及其與圍巖接觸帶部位,以中酸性侵入巖與碳酸鹽巖接觸帶、北西向與北東向斷裂交匯部位及巖脈為重點(diǎn)找礦方向。二者均受地層、構(gòu)造、巖漿巖的綜合控制。綜合研究認(rèn)為,南祁連化隆微地塊化隆鎂鐵—超鎂鐵巖帶為巖漿熔離型銅鎳礦成礦遠(yuǎn)景區(qū),西秦嶺西段北緣崗察一帶為斑巖型、矽卡巖型銅、金、鐵礦成礦遠(yuǎn)景區(qū)。
[Abstract]:The Xunhua area of Qinghai Province is located at the junction of the Qilian orogenic belt and the West Qinling orogenic belt in the central orogenic system, and has experienced complex and multi-stage tectonic-magmatic sedimentary processes in the early Paleozoic and the late Paleozoic to early Mesozoic. It provides favorable geological background and metallogenic environment for many kinds of metallization. The metallogeny has the characteristics of multi-period, multi-type and multi-type. This section has many kinds of ore, complex deposit types and a long span of metallogenic epoch. The ore-forming geological conditions are unique and more than ten ore (chemical) points have been discovered, which is one of the important metal mineral deposits in eastern Qinghai province. The paper is guided by plate tectonics and regional metallogenic theory, and through field investigation, Combined with the past geological and mineral resources data in the study area, the regional geological characteristics and metallogenic geological background of the Xunhua area are studied, and the metallogenic geological conditions of the deposits in different geological periods and different dynamic backgrounds in the Xunhua area are systematically summarized. The ore-controlling factors are discussed, the metallogenic geological background and metallogenic regularity are discussed, and the important prospecting marks in this area are pointed out. It is of great geological significance for regional metallogenic prediction. The following knowledge and progress have been obtained. The main ore-bearing strata in the study area have been reclassified. The Hualong rock group in this area is divided into two lithologic segments. The sedimentary assemblages of the Triassic Longwuhe formation are divided into limestone, conglomerate, fine clastic rock and rhythmic assemblage, and a set of metamorphic rocks is determined, which is temporarily classified into the Liudaogou formation of Cambrian, and the stratigraphic sedimentary assemblage of Longwuhe formation of the Triassic system. The magmatic rocks of Caledonian and Indosinian periods, which are closely related to mineralization, are divided into several intrusions. The study area spans Qilian, Qinling two major metallogenic belts, and the Caledonian stage is the main metallogenic stage in the South Qilian Hualong microblock in the north. Magmatic melting type copper-nickel deposit, pegmatite type rare metal deposit and nonmetallic deposit are mainly developed. Their mineralization is closely related to the subduction geological background. The northern margin of the western part of the western Qinling Mountains in southern China is dominated by the Indosinian epoch and the porphyry type. Skarn type, structural altered rock type polymetallic deposit, Formed under the framework of tectonic transformation from the active continental margin to the continental collision orogeny in the Middle and late Triassic, the deposits in the Hualong microblock, South Qilian, in the north, are mainly distributed in the magnesite supercharged in the transgressive metamorphic strata (the Hualong rock group). In the mafic belt and pegmatite veins, Taking the mafic ultramafic rock and dike rock as the direct prospecting marker, the deposits in the northern margin of the western Qinling Mountains are mainly distributed in the periphery of the intermediate-acid rock mass and its contact zone with the surrounding rock, and the contact zone between the intermediate-acid intrusive rock and the carbonate rock, and the contact zone between the intermediate-acid intrusive rock and the carbonate rock. The intersection of NW and NNE faults and the dike are the key prospecting directions. Both of them are controlled comprehensively by strata, structures and magmatic rocks. Magnesium-ultramafic rock belt of Hualong micro-block in South Qilian is a magmatic melting type copper-nickel metallogenic area, the northern part of west Qinling is porphyry type, skarn type copper, gold and iron ore metallogenic area.
【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(lèi)號(hào)】：P56;P612

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