本文選題：花崗巖類 + 巖石學(xué)特征�。� 參考：《石家莊經(jīng)濟(jì)學(xué)院》2015年碩士論文

【摘要】：內(nèi)蒙古固陽地區(qū)位于華北板塊北緣中段,索倫縫合線和集寧—隆化斷裂以南。一般認(rèn)為,古亞洲洋板塊向華北板塊的俯沖時間為古生代時期,對本區(qū)石炭紀(jì)花崗巖類巖石的巖石學(xué)特征、巖石成因以及構(gòu)造背景的研究,對更好的認(rèn)識石炭紀(jì)花崗巖類乃至整個古生代的花崗巖類以及整個華北板塊的構(gòu)造演化有重要的理論意義。本論文依托于內(nèi)蒙古自治區(qū)大老虎店等四幅1:5萬區(qū)域地質(zhì)礦產(chǎn)調(diào)查,在基于前人研究成果的基礎(chǔ)上,通過對固陽地區(qū)石炭紀(jì)花崗巖類的分布、產(chǎn)出規(guī)模、以及巖石學(xué)特征的研究,利用固陽地區(qū)花崗巖類的主量元素、微量元素以及稀土元素并結(jié)合花崗巖新的理論研究成果,對固陽地區(qū)石炭紀(jì)花崗巖類的形成原因及構(gòu)造背景進(jìn)行了進(jìn)一步的探討,主要得到了以下認(rèn)識:(1)固陽地區(qū)石炭紀(jì)花崗巖類在巖性上主要有三種,分別是黑云母花崗閃長巖、石英二長巖和黑云母正長花崗巖,本文主要對黑云母花崗閃長巖和石英二長巖進(jìn)行了研究,通過對其地球化學(xué)元素特征的分析,兩者均為準(zhǔn)鋁質(zhì)高鉀鈣堿性I型花崗巖類。(2)黑云母花崗閃長巖和石英二長巖均具有較高的結(jié)晶分異指數(shù)(DI),說明其巖漿在演化過程中經(jīng)歷了較好的結(jié)晶分異作用。(3)從微量元素和稀土元素含量特征來看,兩者均具有高Sr、低Yb、輕重稀土高度分餾的特點(diǎn),再結(jié)合其具有較高的Al2O3(大于等于15%)及較小的Mg O(小于等于3%)等主量元素的特點(diǎn),筆者認(rèn)為固陽地區(qū)石炭紀(jì)花崗巖類為與典型埃達(dá)克巖具有相似地球化學(xué)特征的埃達(dá)克質(zhì)巖。(4)通過對固陽地區(qū)石炭紀(jì)花崗巖類的形成原因和構(gòu)造背景的分析可知,該地區(qū)石炭紀(jì)花崗巖類在成因上為古亞洲洋板塊向華北板塊俯沖作用下形成的殼�；旌闲歪Ｔ磶r漿熔融而成;在構(gòu)造背景上,黑云母花崗閃長巖形成于板塊消減過程的大陸弧環(huán)境,石英二長巖形成于板塊俯沖作用的晚造山期環(huán)境。
[Abstract]:Guyang area, Inner Mongolia is located in the middle of the northern margin of North China plate, south of Soren suture line and Jining-uplift fault. It is generally believed that the subduction time of the paleo-Asian oceanic plate to the North China plate was Paleozoic, and the petrological characteristics, petrogenesis and tectonic setting of the Carboniferous granitic rocks in the area were studied. It is of great theoretical significance to better understand the tectonic evolution of the Carboniferous granitoids and the entire Paleozoic granitoids and the North China plate. This paper is based on the investigation of regional geological and mineral resources of 11: 50, 000 in four pieces of Daghudian, Inner Mongolia Autonomous region. Based on the previous research results, the distribution and production scale of Carboniferous granites in Guyang area are studied. And the study of petrological characteristics, using the main elements, trace elements and rare earth elements of granites in Guyang area, and combining with the new theoretical research results of granite. The formation causes and tectonic background of Carboniferous granites in Guyang area are further discussed. The main conclusions are as follows: (1) Carboniferous granodiorites in Guyang area are mainly of three kinds in lithology, which are biotite granodiorite. Quartz monzolite and biotite syenite granodiorite and quartz monzonite are studied in this paper. Both quasi aluminous high potassium calc alkaline I type granitic granodiorite and quartz monzonite have higher crystallization differentiation index, indicating that their magma experienced better crystallization differentiation in the evolution process. From the characteristics of trace elements and rare earth elements, Both have the characteristics of high Sr, low Yb, and high fractionation of heavy and heavy rare earths, combined with the characteristics of higher Al _ 2O _ 3 (> 15) and smaller MgO (less than and equal to 3), etc. The authors consider that the Carboniferous granitic rocks in Guyang area are adakitic rocks with similar geochemical characteristics as typical adakites. The formation causes and tectonic background of Carboniferous granitoids in Guyang area are analyzed. The Carboniferous granitoids were formed from the melting of the crust and mantle mixed mantle magma formed by the subduction of the paleo-Asian oceanic plate to the North China plate. Biotite granodiorite was formed in the continental arc environment during plate subduction, while quartz monzonite was formed in the late orogenic environment of plate subduction.
【學(xué)位授予單位】：石家莊經(jīng)濟(jì)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P588.121

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本文編號：2002693