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内蒙古扎兰屯地区新立屯岩体锆石U-Pb年龄及地球化学特征 预览 被引量:5

ZIRCON U-Pb AGE AND GEOCHEMISTRY OF THE XINLITUN INTRUSIVE ROCKS IN ZHALANTUN AREA, INNER MONGOLIA
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摘要 对内蒙古扎兰屯地区新立屯岩体进行了系统的地球化学及锆石U-Pb同位素年代学研究,并对其岩浆源区和成因进行讨论.研究结果表明,扎兰屯地区花岗闪长岩中锆石具有典型的岩浆振荡生长环带和较高的Th/U比值(0.63~1.07),反映了岩浆成因特征.LA-ICP-MS锆石U-Pb定年结果为135.6±1.3Ma.岩石SiO2含量63.49%~66.68%,具有高钾钙碱性特征,呈准铝质特点.LREE/HREE 比值和(La/Yb)N比值分别为10.07~13.42、15.8~23.3,为轻稀土富集、重稀土亏损型.δEu值0.61~0.80,为弱亏损.以上特征表明,扎兰屯地区新立屯岩体为准铝质Ⅰ型花岗岩.新立屯岩体呈高Sr低Yb型,形成于较高压的下地壳.具有类似于活动大陆边缘花岗岩的岩石组合特征,暗示其可能形成于活动大陆边缘构造背景,即与古太平洋板块的俯冲有关. Based on the study of geochemistry and zircon U-Pb isotopic chronology of the Xinlitun intrusive rocks in Zhalantun area,Inner Mongolia,the magma source and petrogenesis are discussed.The zircons from Xinlitun granodiorite,which yield a LA-ICP-MS U-Pb age of 135.6 ± 1.3 Ma,show typical oscillatory growth rings and high Th/U ratios (0.63-1.07),indicating a magmatic origin.The rocks,with SiO2 content of 63.49% to 66.68%,present high potassium calcalkaline and metaluminous characteristics.The ratios of LREE/HREE (10.07-13.42) and (La/Yb)N (15.8-23.3)suggest enrichment of LREE and deficiency of HREE.The δEu values range from 0.61 to 0.80,showing weak deficiency.These features suggest that the Xinlitun rock body belong to metaluminous Ⅰ-type granite.The Xinlitun granite,with high Sr and low Yb,was formed in the lower crust in high pressure.The rock association characteristics of Xinlitun rock body is similar to those of the active continental margin granite,suggesting that it be possibly formed in active continental margin and related to the subduction of Paleo-Pacific plate.
作者 吴新伟 郭威 张渝金 江斌 张超 WU Xin-wei(Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China;College of Earth Sciences, Jilin University, Changchun 130061, China) GUO Wei(Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China;College of Earth Sciences, Jilin University, Changchun 130061, China) ZHANG Yu-jin(Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China;College of Earth Sciences, Jilin University, Changchun 130061, China) JIANG Bin(Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China;College of Earth Sciences, Jilin University, Changchun 130061, China) ZHANG Chao(Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China;College of Earth Sciences, Jilin University, Changchun 130061, China)
出处 《地质与资源》 CAS 2013年第6期464-470,共7页 Geology and Resources
基金 中国地质调查局“内蒙古1∶5万济沁河林场等四幅区域地质调查”项目(1212011120664)资助.
关键词 新立屯岩体 花岗闪长岩 锆石U-PB年龄 地球化学 Xinlitun intrusive rock granodiorite zircon U-Pb age geochemistry
作者简介 吴新伟(1980-),男,硕士,工程师,主要从事大兴安岭地区区域地质调查、地质构造研究,通信地址 辽宁省沈阳市黄河北大街1号,E-mail//46875025@qq.com
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