【摘要】：論文以“西部重點成礦區(qū)帶高分遙感地質(zhì)礦產(chǎn)調(diào)查技術(shù)研發(fā)與應(yīng)用示范”項目為依托,對甘肅西部馬鞍山復(fù)式巖體研究區(qū)進(jìn)行了線性構(gòu)造解譯、巖體期次劃分、周邊成礦作用分析以及成礦潛力預(yù)測。在前人地質(zhì)工作的基礎(chǔ)上,利用遙感技術(shù)的優(yōu)勢,結(jié)合中低分辨率多光譜數(shù)據(jù)及高分遙感數(shù)據(jù)等多源數(shù)據(jù)提取地質(zhì)信息,從區(qū)域構(gòu)造入手,分析了活動巖漿就位機(jī)制,并較為準(zhǔn)確的查清了該復(fù)式巖體的侵入期次。取得的主要成果如下:(1)對多源遙感數(shù)據(jù)(ETM+、ASTER以及Worldview-2數(shù)據(jù))進(jìn)行數(shù)字圖像增強(qiáng)處理,包括波段組合、反差增強(qiáng)、HIS圖像融合等,增強(qiáng)不同巖性、地物之間的圖像差異,并結(jié)合巖石樣品光譜曲線特征,將馬鞍山復(fù)式巖體三個超單元侵入巖序列進(jìn)一步細(xì)分為14個侵入期次,突顯了高分辨率遙感數(shù)據(jù)在精細(xì)巖性構(gòu)造填圖的優(yōu)勢。同時,本文對于南部紅山序列的解譯填補(bǔ)了該區(qū)域地質(zhì)研究的空白。(2)使用空間域定向濾波和假彩色合成方法增強(qiáng)遙感影像的線狀、環(huán)狀構(gòu)造信息,解譯了復(fù)式巖體周邊的線性構(gòu)造特征,并結(jié)合地區(qū)地質(zhì)資料初步確定了區(qū)域構(gòu)造格架,從遙感宏觀尺度上分析了巖漿活動侵位時間、機(jī)制以及后期巖體演化的基本特征。(3)分析研究區(qū)及周邊礦產(chǎn)分布及礦床、礦化地質(zhì)特征,推測馬鞍山復(fù)式巖體巖漿熱液活動與北側(cè)銅鎳礦化、南側(cè)金礦化的成礦作用沒有密切關(guān)系,研究區(qū)周圍礦體礦化特征符合“小巖體成礦”理論,可以此為指導(dǎo)部署下一步礦產(chǎn)普查、詳查、勘探工作。(4)利用ETM+和ASTER多光譜數(shù)據(jù)對復(fù)式巖體及周圍區(qū)域進(jìn)行鐵染蝕變信息、鋁羥基和鎂羥基蝕變信息,結(jié)合該區(qū)域已知礦床、礦化點信息,綜合分析成礦地質(zhì)特征及成礦要素,對區(qū)域成礦潛力進(jìn)行預(yù)測分析。根據(jù)預(yù)測區(qū)分級原則,圈定了4個A級成礦遠(yuǎn)景區(qū),4個B級成礦遠(yuǎn)景區(qū),3個C級成礦遠(yuǎn)景區(qū)。
[Abstract]:Based on the project of "R & D and Application demonstration of remote Sensing Geology and Mineral Resources Survey Technology with High score in key metallogenic zones in the West of Gansu Province", the paper has carried out linear structural interpretation and classification of rock mass in Ma'anshan complex rock mass study area in the west of Gansu Province. Analysis of peripheral mineralization and prediction of ore-forming potential. On the basis of previous geological work, using the advantage of remote sensing technology, combined with multi-source data such as middle-low resolution multi-spectral data and high-resolution remote sensing data to extract geological information, starting from the regional structure, the mechanism of active magmatic location is analyzed. The intrusive period of the complex rock mass is found out accurately. The main achievements are as follows: (1) Digital image enhancement processing for multi-source remote sensing data (ETM, ASTER and Worldview-2 data, including band combination, contrast enhancement, HIS image fusion and so on, to enhance different lithology. In combination with the spectral curve characteristics of rock samples, the three super-unit intrusive rock sequences of Maanshan composite rock mass are further subdivided into 14 intrusive periods, according to the image differences between the features and the spectral curves of rock samples. The advantages of high resolution remote sensing data in fine lithological structural mapping are highlighted. At the same time, the interpretation of the southern Hongshan sequence fills the blank of geological research in this region. (2) the spatial domain directional filtering and false color synthesis are used to enhance the linear and annular structural information of remote sensing images. The linear tectonic characteristics around the complex rock mass are interpreted, and the regional tectonic framework is preliminarily determined based on the regional geological data, and the emplacement time of magmatic activity is analyzed from the macro-scale of remote sensing. The mechanism and the basic characteristics of the evolution of the later rock mass. (3) the distribution of mineral resources and ore deposits, mineralized geological characteristics of the study area and surrounding rocks are analyzed, and the magmatic hydrothermal activity and the copper-nickel mineralization in the northern side of the Maanshan complex are inferred. The mineralization of gold mineralization on the southern side is not closely related, and the mineralization characteristics of orebodies around the study area are in accordance with the theory of "small rock body mineralization", which can be used as a guide for the deployment of the next mineral survey and detailed investigation. Exploration work. (4) using ETM and ASTER multispectral data to carry out iron staining and alteration information of complex rock mass and surrounding area, aluminum hydroxyl group and magnesium hydroxyl group alteration information, combined with the information of known ore deposits and mineralizing points in this area, The ore-forming geological characteristics and ore-forming elements are comprehensively analyzed, and the regional ore-forming potential is predicted and analyzed. According to the classification principle of prediction area, 4 A-grade ore-forming prospect, 4 B-grade ore-forming prospect and 3 C-grade ore-forming prospect are defined.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P627

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相關(guān)碩士學(xué)位論文 前1條

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本文編號：2449691