• 责任者：Wu Pengfei (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Sun Deyou
• 刊名：Geological Journal of China Universities
• 出版年：2013
• 卷期：19(4)
• 关键词：闪长岩 ; diorites ; 铀—铅计时 ; U-Pb dating ; 岩石地球化学 ; lithogeochemistry ; 吉林 ; Jilin Province
• 页码：p.600-610
• 图表：9 illus., 2 tables, 45 refs.
• 分类号：0801
• issnNo：ISSN1006-7493
• isbnNo：CN32-1440/P

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     The Mesozoic diorites are exposed in Helong area, eastern Jinlin Province. LA-ICP-MS Zircon U-Pb dating indicates that they were formed at 173-175 Ma. The contents of SiO2 are 53.28%-58.02%,Ti02=0.99%-1.08%, MgO= 1.96%-6.45%, TFe203=6.59%-9.64%, Mg#=37-59, Na2O=3.37%-4.88%, K2O=0.94%-2.30%, Na2O/K2O= 1.70-4.16 and A1203=15.87%-18.93%,characterizing high Na and A1. These diorites display characteristics transitional between the sodic calc-alkaline series and high potassium calc-alkaline series. Their chondrite-normalized REE patterns are characterized by high LREEs and low HREEs without Eu negative anomalies. Trace element compositions are characterized by enrichment in large ionic lithophile elements （LILEs; e.g., Rb, U, Th） and depletion in high field strength elements （HFSEs, e.g., Nb, Ta, Zr, Hf, Ti）. The primary magma of the diorites in Helong area were derived from partial melting of mantle wedge which had been metasomatized by subduction fluids and formed in an active continental margin setting induced by subduction of the Paleo-Pacifie plate.