Geochemical constraints on petrogenesis of Late Mesozoic intermediate-felsic volcanic rocks from the southeastern Jilin Province, NE China
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摘要: 详细的主、微量元素和Sr-Nd-Pb同位素研究结果显示,延吉地区晚中生代 (早白垩世)中酸性火山岩具有岛弧型微量元素特征 (富集轻稀土 (LREE)、大离子亲石元素 (LILE)和亏损高场强元素(HFSE)),和中等放射成因Sr、Pb及类似于硅质地球的Nd同位素组成 (87Sr/86Sr(i)=0.70437~0.70525; 206Pb/204Pb(i)=18.19~18.37, 207Pb/204Pb(i)=15.54~15.57, 208Pb/204Pb(i)=38.13~38.22; εNd(t)=-2.75~+1.61)。其Sr-Nd-Pb同位素组成特征类似于区域同期基性火山岩和大兴安岭地区同时代火山岩。这些广泛分布于吉林南部的晚中生代中酸性火山岩是岩石圈地幔来源岩浆经分离结晶或地壳物质混染/AFC过程的产物。吉林省东南部晚中生代不同区域火山岩的Sr-Nd-Pb同位素对比结果显示,辽源-延吉与通化地区分属不同构造单元,其中辽源-延吉一带则为中亚造山带的东段,而通化地区为华北克拉通的一部分,夹皮沟-松江断裂可能是华北克拉通东北缘的边界。Abstract: A detailed major, trace elemental and Sr-Nd-Pb isotopic study on Late Mesozoic (Early Cretaceous) intermediate-felsic volcanic rocks from the southeastern Jilin Province, NE China is presented in this paper. The results show that these rocks have arc-type trace element features (large ion lithosphile element (LILE) and light rare earth element (LREE) enrichments, and high field strength element (HFSE) depletions) and moderately radiogenic Sr and Pb, and chondritic Nd isotope compositions (87Sr/86Sr(i)=0.70437~0.70525; 206Pb/204Pb(i)=18.19~18.37, 207Pb/204Pb(i)=15.54~15.57, 208Pb/204Pb(i)=38.13~38.22; εNd(t)=-2.75~+1.61), analogues to the contemporaneous mafic rocks from the study area and those from the Great Hinggan Mountains. Combined major, trace element and Sr-Nd-Pb isotope data of the intermediate-felsic rocks, as well as their geochemical similarities to those mafic rocks in the study area, we suggest that these intermediate-felsic melts were differentiates of coeval mantle-derived mafic magmas via fractional crystallization, crustal contamination and/or AFC processes. Further Sr-Nd-Pb isotopic comparison among the Late Mesozoic igneous rocks in the southeastern Jilin Province suggests that the Yanji-Liaoyuan area is the eastern segment of the Central-Asian Orogenic Belt, whereas the Tonghua area belongs to the North China Craton. The Jiapigou-Songjiang fault possibly represents the northeastern boundary of the North China Craton that separates it from the Central-Asian Orogenic Belt.
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