本文關(guān)鍵詞： 興蒙造山帶 鋯石U-Pb定年 構(gòu)造巖漿巖帶 晚石炭世　出處：《中國地質(zhì)大學(xué)(北京)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：研究區(qū)位于興蒙造山帶二連—賀根山蛇綠巖帶北側(cè),二連—賀根山蛇綠巖帶北部地區(qū)廣泛發(fā)育晚古生代構(gòu)造巖漿巖,通過對晚古生代構(gòu)造巖漿巖帶內(nèi)的花崗斑巖和中細(xì)�；◢忛W長巖進(jìn)行精準(zhǔn)的年代學(xué)和地球化學(xué)研究,并結(jié)合前人晚古生代巖漿巖資料,系統(tǒng)的研究賀根山構(gòu)造帶北部地區(qū)晚古生代侵入巖的成因及其大地構(gòu)造背景,為西伯利亞板塊和華北板塊的最終閉合時間及其碰撞演化歷史提供新的證據(jù)。本文研究的賀根山構(gòu)造帶北侵入巖位于達(dá)來蘇木一帶,巖性為中細(xì)�；◢忛W長巖和花崗斑巖,運(yùn)用LA-ICP-MS測年方法對中細(xì)�；◢忛W長巖和花崗斑巖進(jìn)行測年,鋯石U-Pb年齡分別為328±2 Ma(MSWD=1.3)和304±2 Ma(MSWD=2.0)。SiO2含量為67.91%~71.98%,Al2O3含量為14.04%~14.85%,TiO2含量為0.32%~0.37%,A/CNK值為0.95~1.03,介于準(zhǔn)鋁—過鋁質(zhì)花崗巖類之間。結(jié)合前人以往的資料表明,在二連—賀根山蛇綠巖帶北部地區(qū)發(fā)育有330 Ma~300 Ma石炭紀(jì)的侵入巖以鈣堿性—高鉀鈣堿性系列為主,并在二連—賀根山蛇綠巖帶北部地區(qū)形成I型花崗質(zhì)巖漿為主的巖漿巖帶,二連浩特—賀根山蛇綠巖帶作為晚古生代縫合帶邊界,洋盆閉合后陸—陸碰撞對接作用,是縫合帶北側(cè)產(chǎn)生大量晚古生代巖漿巖的原因。
[Abstract]:The study area is located on the north side of Erlian-Hegen Mountain ophiolite belt of Xingmeng orogenic belt, and the late Paleozoic tectonic magma is widely developed in the northern part of Erlian-Hegenshan ophiolite belt. Based on the accurate geochronology and geochemistry of granitic porphyry and meso-fine-grained granodiorite in the late Paleozoic tectonic magmatic belt, combined with the previous data of late Paleozoic magmatic rocks, The genesis and tectonic setting of the late Paleozoic intrusive rocks in the northern part of the Hegenshan tectonic belt are systematically studied. It provides new evidence for the final closing time of Siberian plate and North China plate and the history of collision and evolution. The northern intrusive rocks of the Hegenshan tectonic belt studied in this paper are located in the Dalasumu area, and the lithology is of medium and fine granodiorite and granitic porphyry. The LA-ICP-MS dating method is used for the dating of medium and fine granodiorite and granitic porphyry. Zircon U-Pb age of 328 鹵2 Ma-MSWD3) and 304 鹵2 Ma(MSWD=2.0).SiO2 content of 67.91and 71.98Al _ 2O _ 3 are 14.04and 14.85Al _ 2O _ 3, 0.32and 0.37mg / 0.37mg respectively, which are between quasi-aluminum-peraluminous granitic granites. In the northern part of the Erlian-Hegenshan ophiolite belt, there are 330 Ma~300 Ma Carboniferous intrusive rocks mainly composed of calc-alkaline and high-potassium calc-alkaline series, and a magmatic belt dominated by type I granitic magma is formed in the northern part of the Erlian-Hegenshan ophiolite belt. As the boundary of the late Paleozoic suture belt, Erlianhaot-Hegen Mountain ophiolite belt is the reason of the late Paleozoic magmatic rocks produced in the northern side of the suture zone.
【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】：2016
【分類號】：P597.3;P588.1

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