本文選題：花崗巖　切入點(diǎn)：鋯石U-Pb年齡　出處：《干旱區(qū)資源與環(huán)境》2017年05期 　論文類(lèi)型：期刊論文

【摘要】：通過(guò)對(duì)內(nèi)蒙古呼倫貝爾地質(zhì)公園阿敦礎(chǔ)魯花崗巖進(jìn)行的鋯石U-Pb同位素年代測(cè)定和巖石樣品主要地球化學(xué)特征分析,結(jié)合野外地質(zhì)調(diào)查成果,綜合分析表明,阿敦礎(chǔ)魯花崗巖鋯石U-Pb年齡為158.0±2.7Ma,為晚侏羅世巖漿活動(dòng)的產(chǎn)物;巖石具有富硅、高鉀鈣堿性和過(guò)鋁質(zhì)特征,富集大離子親石元素Rb、Th、K等,輕微虧損高場(chǎng)強(qiáng)元素Ta、Nb、Zr等。結(jié)合區(qū)域地質(zhì)研究成果,初步確定阿敦礎(chǔ)魯正長(zhǎng)花崗巖是晚侏羅世蒙古-鄂霍茨克洋閉合造山后伸展作用下地殼擠壓增厚局部熔融的產(chǎn)物。
[Abstract]:Based on the zircon U-Pb isotopic dating and the main geochemical characteristics of rock samples in Hulunbeir Geopark, Inner Mongolia, combined with the results of field geological survey, the comprehensive analysis shows that the zircon U-Pb isotopic dating and the main geochemical characteristics of the rock samples are analyzed. The zircon U-Pb age of the Aduchulu granite is 158.0 鹵2.7 Ma, which is the product of late Jurassic magmatism, and the rocks are rich in silicon, high potassium, calc-alkaline and peraluminous, and enriched in the large ion lithophile element RbSh K, etc. Combined with the results of regional geological research, it is preliminarily determined that the Aduzhuzheng granite is the product of local melting of crustal compression and thickening due to the late Jurassic Mongolia-Okhotsk ocean closed orogenic extension.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;中國(guó)地質(zhì)科學(xué)院;
【基金】：內(nèi)蒙古自治區(qū)新巴虎右旗國(guó)土資源局專(zhuān)項(xiàng)基金項(xiàng)目(20130901)資助
【分類(lèi)號(hào)】：P597.3;P588.121

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