本文選題：巖漿巖 + 巖石學(xué)��； 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：根據(jù)全球大地構(gòu)造板塊學(xué)說,研究區(qū)位于全球大型造山帶—烏拉爾—蒙古造山帶的中心位置,是全球范圍內(nèi)較典型的造山帶,同時(shí)也位于西伯利亞陸塊和哈薩克斯坦地塊的接合部位,而且屬于天山—興安地槽褶皺的一部分。出露地層較全,有下、中泥盆統(tǒng)和下、中石炭統(tǒng),同時(shí)還出露奧陶系,新生界的分布較廣�？瓶藥�(kù)都克、阿克塔斯、克乃特地區(qū)位于新疆東準(zhǔn)噶爾北部,開展三個(gè)地區(qū)火山巖、花崗巖的研究對(duì)于綜合分析地質(zhì)歷史時(shí)期東準(zhǔn)噶爾北部的大地構(gòu)造背景具有重要的理論意義。本文通過收集前人的資料和研究成果,運(yùn)用礦物學(xué)、巖石學(xué)、地球化學(xué)、同位素年代學(xué)等學(xué)科理論,選取阿克塔斯和科克庫(kù)都克的火山巖以及克乃特地區(qū)的花崗巖進(jìn)行研究探討。通過野外和室內(nèi)的深入研究,本文歸納總結(jié)了該區(qū)域的巖漿巖巖石學(xué)特征、地球化學(xué)特征、年代學(xué)特征。根據(jù)火山巖類的主量元素TAS圖解、SiO2-AR圖解、A/NK-A/CNK圖解和K2O-SiO2圖解,同時(shí)結(jié)合薄片的鏡下鑒定結(jié)果,分析得出科克庫(kù)都克、阿克塔斯兩個(gè)地區(qū)火山巖主要以基性-中性為主,進(jìn)一步確定為準(zhǔn)鋁質(zhì)、堿性-鈣堿性-高鉀鈣堿性-鉀玄質(zhì)玄武巖-安山玄武巖-粗面巖-粗面安山巖-粗面英安巖系列�？四颂氐貐^(qū)的巖性及原巖主要是鈣堿性準(zhǔn)鋁質(zhì)-過鋁質(zhì)花崗巖-花崗閃長(zhǎng)巖-閃長(zhǎng)巖。根據(jù)稀土元素球粒隕石配分曲線得知,輕稀土配分曲線相對(duì)傾斜、重稀土元素配分曲線比較平緩,基本呈現(xiàn)水平狀態(tài)。輕重稀土分餾都比較弱,屬于弱分異或基本不分異。稀土元素球粒隕石標(biāo)準(zhǔn)化圖和微量元素原始地幔標(biāo)準(zhǔn)化蜘蛛網(wǎng)圖解均呈右傾的“W”型,元素由左至右,先發(fā)散,后集中；巖石相對(duì)富集U、Pb,明顯正異常；相對(duì)虧損Th、Nb、Ce、Pr,明顯的負(fù)異常,顯示出島弧巖漿的特征。該地區(qū)巖漿巖206Pb/238U年齡加權(quán)平均值為388.0Ma±6.7Ma、303-397Ma等,表明火山巖形成事件主要在晚古生代的泥盆紀(jì)、石炭紀(jì)。島弧巖漿巖來源于俯沖板塊滑動(dòng)過程中產(chǎn)生的流體交代地幔物質(zhì)而形成的含水的流體,其高場(chǎng)強(qiáng)元素較低,巖漿主要為地幔演化的產(chǎn)物,并含有地殼物質(zhì)的混染。
[Abstract]:According to the global tectonic plate theory, the study area is located at the center of the large orogenic belt, Ural-Mongolia orogenic belt, and is a typical orogenic belt in the world. It is also located at the junction of the Siberian and Kazakh blocks and is part of the Tianshan-Xingan geosyncline fold. The outcrop strata are relatively complete, there are lower, middle Devonian and Lower Carboniferous, and also the Ordovician, the Cenozoic is widely distributed. The Kirk Kuduk, Aktas, and Kenet regions are located in the northern part of East Junggar, Xinjiang, where volcanic rocks are developed in three areas. The study of granites is of great theoretical significance for the comprehensive analysis of the tectonic setting in the northern part of East Junggar during the geological history. In this paper, by collecting the previous data and research results, we apply the theories of mineralogy, petrology, geochemistry, isotopic chronology, etc. The volcanic rocks of Aktas and Kirk Kuduk and the granite in Knut area are selected to study. In this paper, the petrology, geochemistry and geochronology of magmatic rocks in this area are summarized through field and laboratory studies. According to the principal elements of volcanic rocks, such as TAS diagram, SiO2-AR diagram, A / NK-A / CNK diagram and K _ 2O-SiO _ 2 diagram, combined with the microscopic identification results of the thin sheet, it is concluded that the volcanic rocks in Kirk Kuduk and Aktas are mainly basic-neutral. The series of pseudo-aluminite, alkaline-calc-alkaline-high-potassium-calc-alkaline-kalabinite-anshan basalt-rough andesite-trachyte-trachyte are determined. The lithology and primary rocks of Knite area are mainly calc-alkaline quasi-aluminite peraluminous granite granodiorite diorite. According to the chondrites distribution curve of rare earth elements, the light rare earth distribution curve is relatively inclined, the heavy rare earth element distribution curve is relatively smooth, and the distribution curve of heavy rare earth elements is basically horizontal. Light and heavy rare earth fractionation are relatively weak, belong to weak differentiation or basic non-differentiation. The normalized maps of chondrites and trace elements in the primitive mantle are all "W" type with the elements from left to right, which diverge first and then concentrate, and the rocks are relatively enriched with UPb, which is obviously positive anomaly. The relative depletion of ThnbCe Pris is obviously negative anomaly, which shows the characteristics of island arc magma. The weighted average of 206Pb / 238U age of magmatic rocks in this area is 388.0 鹵6.7 Ma, 303-397Ma, which indicates that the formation events of volcanic rocks mainly occurred in late Paleozoic Devonian and Carboniferous. The island arc magmatic rocks are derived from the fluid metasomatism of mantle materials produced during the subduction plate sliding, and the high field strength elements are lower. The magma is mainly the product of mantle evolution and contains the mixed contamination of crustal materials.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.1

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本文編號(hào)：2117733