本文選題：阿確礅地區(qū)　切入點(diǎn)：花崗巖　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：祁漫塔格地區(qū)位于東昆侖造山帶西段,同時(shí)也是中央造山帶重要組成部分。近年來在東昆侖東段發(fā)現(xiàn)一系列的早古生代晚期的高壓-超高壓巖石,因此如何重新認(rèn)識(shí)東昆侖造山帶早古生代的構(gòu)造演化過程顯得尤為重要�；◢弾r形成于造山帶的不同時(shí)期,不同類型的花崗巖包含造山作用階段的大量地質(zhì)信息。探討花崗巖的源巖特征和成因,有助于追索地殼中各種物質(zhì)含量、造山過程中動(dòng)力演化及造山過程中殼幔物質(zhì)交換作用等問題。東昆侖西段祁漫塔格阿確礅地區(qū)出露大量花崗質(zhì)巖體。本文選取奧陶紀(jì)、泥盆紀(jì)花崗巖作為研究對(duì)象,對(duì)其開展鋯石LA-ICP-MS U-Pb測(cè)年和相應(yīng)的地球化學(xué)研究。同時(shí)結(jié)合前人認(rèn)識(shí)和項(xiàng)目組研究成果,對(duì)祁漫塔格阿確礅地區(qū)花崗巖的形成時(shí)代、巖石成因和大地構(gòu)造背景方面進(jìn)行討論。帕奇通奧陶紀(jì)巖體主要由輝石閃長(zhǎng)巖和二長(zhǎng)花崗巖組成。二者呈涌動(dòng)式接觸關(guān)系,同時(shí)閃長(zhǎng)巖以包體形式產(chǎn)出與二長(zhǎng)花崗巖中。其中輝石閃長(zhǎng)巖獲得年齡為452±2.5Ma,二長(zhǎng)花崗巖形成年齡為448±5.4Ma。二者為晚奧陶世巖漿活動(dòng)的產(chǎn)物。輝石閃長(zhǎng)巖和二長(zhǎng)花崗巖均表現(xiàn)出類似島弧I型花崗巖特征。如富集LREE,富集大離子親石元素(Rb、Ba等),虧損Nb-Ta、Ti等。帕奇通奧陶紀(jì)巖體為I型花崗巖,形成于島弧俯沖消減環(huán)境,與祁漫塔格洋盆俯沖相關(guān),代表了俯沖階段。灘北山巖體的巖石類型包括二長(zhǎng)花崗巖和英云閃長(zhǎng)巖,其中二長(zhǎng)花崗巖和英云閃長(zhǎng)巖鋯石測(cè)年得到384±4.6 Ma、393±4.9Ma,反映侵位時(shí)代為中泥盆世。二長(zhǎng)花崗巖和英云閃長(zhǎng)巖元素研究表明,為準(zhǔn)鋁質(zhì)-過鋁質(zhì)的高鉀鈣堿性,I型花崗巖,為后造山伸展階段幔源巖漿同化地殼物質(zhì)的產(chǎn)物。綜合區(qū)域地質(zhì)研究結(jié)果,祁漫塔格地區(qū)在早古生代-晚古生代早期構(gòu)造演化過程,大致經(jīng)歷三個(gè)構(gòu)造階段,寒武-奧陶紀(jì)洋-陸俯沖階段,主要以發(fā)育大量類似I型弧花崗巖;志留紀(jì)-早泥盆世碰撞造山階段,主要以區(qū)域上發(fā)育一系列高壓-超高壓變質(zhì)巖;泥盆紀(jì)造山后伸展階段,主要以牦牛山組磨拉石建造以及A型花崗巖為標(biāo)志。
[Abstract]:The Qimantage area is located in the western part of the East Kunlun orogenic belt and is also an important part of the central orogenic belt. In recent years, a series of high-pressure and ultra-high pressure rocks have been discovered in the eastern part of East Kunlun in the late early Paleozoic. Therefore, it is important to re-understand the tectonic evolution of the East Kunlun orogenic belt in the early Paleozoic. The granites were formed in different periods of the orogenic belt. Different types of granites contain a great deal of geological information about the orogenic stage. It is helpful to trace the contents of various materials in the crust by discussing the characteristics and genesis of the source rocks of the granites. Dynamic evolution during orogeny and material exchange between crust and mantle during orogeny. A large number of granitic rocks were exposed in the western Qiman Tagaqog Pier area of East Kunlun. In this paper, Ordovician and Devonian granites are selected as research objects. Zircon LA-ICP-MS U-Pb dating and corresponding geochemical studies have been carried out on it. Combined with previous understanding and project team research results, the formation age of granites in the Qiman Taggoqog block area has been studied. The Pagitong Ordovician rock body is mainly composed of pyroxene diorite and monzomorphic granite. At the same time, diorite was produced in the form of inclusions and in monzomorphic granite. The age of pyroxene diorite was 452 鹵2.5 Ma. and the age of formation of dicyanite was 448 鹵5.4 Ma. both of them were the product of late Ordovician magmatic activity, and pyroxene diorite and monzomorphic granite were the products of magmatic activity in late Ordovician. All of them show similar characteristics of island-arc I type granites, such as LREE enrichment, large ion lithophile element Rbnba and so on, depleted Nb-Taanti, etc. The Pachitong Ordovician granites are I-type granites, and the Pakitong Ordovician granites are I-type granites. Formed in the subduction environment of island arc and associated with the subduction of the Qimantage ocean basin, it represents the subduction stage. The rock types of the Tandbeishan rock body include monzogranite and dolomite diorite. The zircon dating of the monzogranites and the dolomite shows 384 鹵4.6 Ma- 393 鹵4.9 Ma. which reflects that the emplacement age is the Middle Devonian. The study of the elements of the monzogranites and the dolomite diorites shows that the quasi-aluminum-peraluminous high-potassium calc-alkaline granites are of the type I. It is the product of mantle magma assimilating crustal material in post-orogenic extensional stage. Based on the results of regional geological studies, Qimantage area experienced three tectonic stages during the early Paleozoic to early late Paleozoic tectonic evolution. The Cambrian-Ordovician ocean-continental subduction stage mainly developed a large number of I-like arc granites; the Silurian early Devonian collisional orogenic stage mainly developed a series of high-pressure and ultra-high pressure metamorphic rocks; the Devonian post-orogenic extension stage, It is mainly marked by the Molashi formation of the Yak Niushan formation and the A-type granite.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P588.1;P548

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳守建;趙振明;計(jì)文化;李榮社;劉榮利;查顯鋒;;西昆侖及鄰區(qū)早-中二疊世構(gòu)造—巖相古地理特征[J];地質(zhì)科學(xué);2013年04期

2 張愛奎;劉光蓮;豐成友;莫宣學(xué);楊六成;劉永樂;何書躍;馬永壽;;青�；㈩^崖多金屬礦床地球化學(xué)特征及成礦-控礦因素研究[J];礦床地質(zhì);2013年01期

3 劉彬;馬昌前;張金陽(yáng);熊富浩;黃堅(jiān);蔣紅安;;東昆侖造山帶東段早泥盆世侵入巖的成因及其對(duì)早古生代造山作用的指示[J];巖石學(xué)報(bào);2012年06期

4 王秉璋;羅照華;潘彤;宋泰忠;校培喜;張志青;;青藏高原祁漫塔格地區(qū)早古生代火山巖巖石構(gòu)造組合和LA-ICP-MS鋯石U-Pb年齡[J];地質(zhì)通報(bào);2012年06期

5 豐成友;王松;李國(guó)臣;馬圣鈔;李東生;;青海祁漫塔格中晚三疊世花崗巖:年代學(xué)、地球化學(xué)及成礦意義[J];巖石學(xué)報(bào);2012年02期

6 吳祥珂;孟繁聰;許虹;崔美慧;;青海祁漫塔格瑪興大坂晚三疊世花崗巖年代學(xué)、地球化學(xué)及Nd-Hf同位素組成[J];巖石學(xué)報(bào);2011年11期

7 崔美慧;孟繁聰;吳祥珂;;東昆侖祁漫塔格早奧陶世島弧:中基性火成巖地球化學(xué)、Sm-Nd同位素及年代學(xué)證據(jù)[J];巖石學(xué)報(bào);2011年11期

8 李文淵;張照偉;高永寶;譚文娟;姜寒冰;郭周平;;秦祁昆造山帶重要成礦事件與構(gòu)造響應(yīng)[J];中國(guó)地質(zhì);2011年05期

9 莫宣學(xué);;巖漿作用與青藏高原演化[J];高校地質(zhì)學(xué)報(bào);2011年03期

10 郭通珍;劉榮;陳發(fā)彬;白旭東;李紅剛;;青海祁漫塔格山烏蘭烏珠爾斑狀正長(zhǎng)花崗巖LA-MC-ICPMS鋯石U-Pb定年及地質(zhì)意義[J];地質(zhì)通報(bào);2011年08期

，

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