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Discovery of the Indosinian aluminum A-type granite in Zhejiang Province and its geological significance 被引量:20

Discovery of the Indosinian aluminum A-type granite in Zhejiang Province and its geological significance
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摘要 Zircon LA-ICP-MS U-Pb dating of the Jingju syenogranites in the southwestern part of Zhejiang Province shows that these rocks were crystallized in the Late Triassic at 215±2 Ma, rather than in the Cretaceous as previously proposed. The Jingju sy- enogranites are characterized by relatively high K2O and FeO*, and low MgO. They have high concentrations of large ion lithophile elements (LIL) and LREE, such as K, Th, La, and Ce, but are depleted in high field strength elements (HFSE) such as Nb, Ta, and Ti. Their 104Ga/A1 ratios and (Zr+Nb+Ce+Y) contents are also high. These characteristics are similar to those of A-type granites. The syenogranites have high Isr (0.7179-0.7203), low eNa(t) (from --14.2 to --13.2), and relatively old T2DM ages, similar to those of the ancient metamorphic basement in the Cathaysia Block. It is suggested that the Jingju syenogranites were formed by partial melting of the Cathaysia basement rocks during tectonic extension. This identification of Indosinian A-type granite in Jingju has significant implications for understanding the early Mesozoic tectonic evolution of South China. Zircon LA-ICP-MS U-Pb dating of the Jingju syenogranites in the southwestern part of Zhejiang Province shows that these rocks were crystallized in the Late Triassic at 215±2 Ma, rather than in the Cretaceous as previously proposed. The Jingju syenogranites are characterized by relatively high K 2 O and FeO*, and low MgO. They have high concentrations of large ion lithophile elements (LIL) and LREE, such as K, Th, La, and Ce, but are depleted in high field strength elements (HFSE) such as Nb, Ta, and Ti. Their 10 4 Ga/Al ratios and (Zr+Nb+Ce+Y) contents are also high. These characteristics are similar to those of A-type granites. The syenogranites have high I Sr (0.7179-0.7203), low ε Nd (t) (from 14.2 to 13.2), and relatively old T 2DM ages, similar to those of the ancient metamorphic basement in the Cathaysia Block. It is suggested that the Jingju syenogranites were formed by partial melting of the Cathaysia basement rocks during tectonic extension. This identification of Indosinian A-type granite in Jingju has significant implications for understanding the early Mesozoic tectonic evolution of South China.
出处 《Science China Earth Sciences》 SCIE EI CAS 2012年第1期13-25,共13页 中国科学(地球科学英文版)
基金 supported by Ministry of Science and Technology of China (Grant No. 2007DFA21230) Natural Science Foundation of Hubei Province (Grant No. 2009CDA004) National Natural Science Foundation of China (Grant Nos. 40821061, 40334037) Ministry Education of China, State Administration of Foreign Expert Affairs of China (Grant No. B07039) Survey and Assessment of Geology and Mineral Resources (Grant No. B[2010]AMR01-17-05)
关键词 INDOSINIAN CHRONOLOGY GEOCHEMISTRY A-type granite Zhejiang Province A型花岗岩 浙江省 地质意义 LA-ICP-MS U-Pb年龄 基底岩石 构造演化 高场强元素
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