本文選題：摩天嶺地塊　切入點：大地電磁測深　出處：《成都理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：摩天嶺地塊位于陜甘川三省鄰接區(qū),構(gòu)造上處于揚子地塊西北緣,松潘-甘孜構(gòu)造帶東北,北面為西秦嶺造山帶。摩天嶺地區(qū)多金屬礦產(chǎn)資源豐富,但是礦產(chǎn)開采主要集中在地表及淺部,隱伏礦產(chǎn)勘探程度較低,已有礦產(chǎn)資源儲備不能滿足經(jīng)濟社會發(fā)展的要求,主要原因是對其深部構(gòu)造及成礦來源研究不足。大地電磁測深以天然大地電磁場為場源,通過寬頻大地電磁測深與長周期大地電磁測深相結(jié)合,能有效探測地殼及上地幔的深部電性結(jié)構(gòu)特征,可對研究區(qū)深部的物質(zhì)來源與運移提供地球物理依據(jù)。論文依托龍門山構(gòu)造帶深部地質(zhì)調(diào)查項目,利用橫跨摩天嶺地塊南北向的榆中-劍閣及東西向的松潘-漢中兩條大地電磁測深剖面,通過遠參考等去噪處理方法以及Rhoplus理論對數(shù)據(jù)拼接的研究,保證了數(shù)據(jù)質(zhì)量的可靠性,并通過選擇合適的反演方法得到了研究區(qū)深部的電性結(jié)構(gòu)分布。論文介紹了研究區(qū)的地層、巖漿巖分布、主要斷層、構(gòu)造演化及礦產(chǎn)分布,分析了典型礦產(chǎn)成礦年齡及其與巖漿巖的對應關系并總結(jié)其分布規(guī)律。對橫跨摩天嶺地塊的大地電磁二維反演剖面進行了解釋。以深部電性結(jié)構(gòu)為依據(jù),結(jié)合相關地質(zhì)資料,根據(jù)深部電性結(jié)構(gòu)與巖漿、礦產(chǎn)分布的時空關系,推測巖漿深部來源與運移通道,探討多金屬礦產(chǎn)的深部物質(zhì)來源與運移情況,為尋找隱伏礦體及遠景找礦提供依據(jù)。榆中-劍閣大地電磁測深剖面揭示了摩天嶺地塊南北向的深部電性結(jié)構(gòu),摩天嶺構(gòu)造帶為殼高-幔低阻結(jié)構(gòu),在地殼以下存在一明顯的低阻橢圓囊狀結(jié)構(gòu),與下部連通至巖石圈底界面的低阻柱狀體形成低阻地幔柱結(jié)構(gòu),構(gòu)成巖石圈以下軟流圈中巖漿向上運移的通道,在低阻橢圓囊狀體中形成部分熔融的巖漿囊。巖漿囊南北兩端上拱,與上部連接至地表的低阻帶連接形成逆沖-走滑花狀構(gòu)造,分別在龍門山斷裂帶與勉略縫合帶形成巖漿上涌的通道,且沿北端上涌作用比南端強。松潘-漢中大地電磁測深剖面揭示了摩天嶺地塊東西向的深部電性結(jié)構(gòu),電性結(jié)構(gòu)顯示深部存在與南北向榆中-劍閣剖面類似的殼高-幔低阻結(jié)構(gòu),對應摩天嶺地塊下巖漿囊東西向的分布特征,巖漿向西運移分別在劉家坪及雪寶頂附近形成向上運移的通道。在這些巖漿上涌的通道上部,地表分布的小型巖漿巖脈與金等多金屬礦產(chǎn)分布關系密切。論文在研究中對研究區(qū)電性結(jié)構(gòu)有其它一些認識與探討:通過對龍門山北段電性結(jié)構(gòu)與南段的對比,認為龍門山構(gòu)造帶橫向結(jié)構(gòu)上存在不均勻性;西秦嶺中部存在一連通殼幔的低阻帶,與其他相關研究成果對比,推測西秦嶺造山帶中部存在一大型殼幔低阻巖漿通道,地表廣泛分布的大型花崗巖與這一巖漿通道具有一致性,可能為這一巖漿通道的產(chǎn)物。根據(jù)地表地質(zhì)構(gòu)造背景及金等多金屬礦床的地質(zhì)特征綜合分析,在摩天嶺地區(qū)巖漿上涌通道上部,地殼中低阻帶內(nèi)沿著大型脆性、脆韌性滑脫剪切帶(斷層)中發(fā)育的印支-燕山期小型淺成、超淺成中酸性巖株、巖枝特別是中酸性小型巖脈與金等多金屬成礦關系密切,是形成金等多金屬礦床最有希望的地段和最主要的找礦標志,并進一步提出摩天嶺地塊及鄰區(qū)的有利成礦帶,為隱伏礦體勘探及遠景找礦提供依據(jù)。
[Abstract]:Motenlin is located in Gansu and Sichuan provinces adjacent areas, the structure is located in the northwestern margin of the Yangtze craton, northeast Ganzi tectonic belt of Songpan, north of the West Qinling Mountains orogenic belt. Polymetallic mineral resources in Motianling region rich in mineral mining, but mainly concentrated in the surface and shallow buried mineral exploration degree is low, the existing reserves of mineral resources can not to meet the requirements of economic and social development, the main reason is the lack of the deep tectonic and metallogenic source research. Magnetotelluric sounding to earth natural electromagnetic field source, through broadband magnetotelluric and long period earth electric magnetic deep combination, can effectively detect the crust and the upper mantle of the deep electrical structure characteristics, to provide the earth the physical basis material source and migration of deep research area. Based on the deep geological survey project in Longmen mountain tectonic belt, use across the North-South Yuzhong Motianling massif in Jiange And things to the Songpan - Hanzhoung two magnetotelluric sounding profiles, by far reference denoising method and Rhoplus theory to study on data registration, to ensure the reliability of data quality, and by selecting the appropriate retrieval method of electrical structure distribution of deep research area is obtained. This paper introduces the study area formation, magmatite distribution, main faults, tectonic evolution and distribution of mineral resources, analyzes the corresponding relation between the typical mineral metallogenic age and magmatite and summarize its distribution. In the section of two-dimensional magnetotelluric inversion across motenlin plots were explained. The deep electric structure as the basis, combined with the related geological data, according to the deep Department of electrical structure and magma, relationship between time and space distribution of mineral, that deep source magma and migration channels, explore Polymetallic Mine deep source and migration, to search for concealed ore bodies And provide the basis for ore prospecting. Yuzhong - Jiange magnetotelluric profile reveals Ferris Ling plots to the north and South deep electric structure, Motianling tectonic belt is the shell high mantle low resistivity structure, has low resistance elliptic cystic structure obviously in the crust, and the lower part connected to a low resistance column of lithosphere the bottom interface form a low resistivity mantle plume structure formed under lithosphere asthenosphere magma migration channels formed by partial melting of the magma in the low resistivity cystidium. Elliptical magma on the north and south ends of the arch, connected to form into a thrusting strike slip flower structure and connected to the upper surface of low resistivity belt, belt formed respectively upwelling of magma channels and MIANLUE suture zone in the Longmen mountain fault, and along the northern tip of strong upwelling than. Songpan - Hanzhoung magnetotelluric profile reveals the Ferris Ling plots things to the deep electrical structure, electrical structure display The presence of North and south to the Yuzhong Jiange profile similar shell high mantle low resistivity structure, distribution of magma East-West corresponding Motianling massif, magmatic westward migration respectively in liujiaping and xubaoding formed near the migration channel. The upper channel in the upwelling of magma, small magmatite surface veins the distribution of gold and polymetallic mineral distribution closely. The discussion and some other knowledge of electrical structure in the study area in the study: through the comparison of the northern part of the Longmen mountains and the southern section of the electrical structure, that the Longmen mountain tectonic belt transverse structure is uneven; low resistance connected with a crust mantle west central Qinling Mountains, compared with other relevant research results, that the western Qinling Mountains orogenic belt of the existence of a large low resistivity crust mantle magma channel, large granite surface is widely distributed and the magma channel is consistent, it may be A product of magma channel. According to the comprehensive analysis of geological background and geological characteristics of surface gold polymetallic deposit, the magma of Motianling region upwelling upper channel, crustal low resistivity zone along the large brittle, brittle ductile decollement shear zone (fault) in the development of the Indosinian Yanshan small hypabyssal ultrahypabyssal. In acidic rock strains, especially in acidic rock branches of small dikes and gold polymetallic metallogenic prospecting is closely, formation of gold polymetallic deposits in the most promising area and the main symbol, and further puts forward the favorable metallogenic Motianling massif and its vicinities zone, provide the basis for exploration and Prospect of orebody concealed ore prospecting.

【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P631.3

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