Magma Mixing Generated Triassic I-Type Granites in South China
作者： Haijin Xu , Changqian Ma , Junhong Zhao , Junfeng Zhang
DOI: 10.1086/675667
关键词: Geochronology 、 Geology 、 South china 、 Geochemistry 、 Igneous differentiation 、 Pluton 、 Mafic 、 Rare-earth element 、 Zircon
摘要: AbstractA Triassic granodioritic pluton with mafic microgranular enclaves (MMEs) in central South China provides an important insight into crust-mantle interaction. Here we present a comprehensive study of fieldwork, geochronology, geochemistry, and Sr-Nd-Hf isotopes for the Taojiang host MMEs China. The granodiorites (218 ± 3 Ma) are high-K calc-alkaline I-type granites (SiO2: 66.17–69.47 wt%; ANCK < 1.0) that show light rare earth element (REE) enrichment flat heavy REE patterns weakly negative Eu anomalies. They exhibit strongly Ba, Sr, Nb, P, Ti anomalies positive Rb Pb have high initial 87Sr/86Sr ratios (0.712783 to 0.714799), eNd(t) values (−8.3 −7.8), zircon eHf(t) (−6.4 −3.1). coeval (225 compositions ranging from intermediate 49.2–60.8 wt%) MgO (2.8–6.3 wt%), FeOT (6.7–15.2 CaO (4.3–7.1 TiO2 (0.8–2.0 Ni (18.2–6...
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