Petrogenesis and tectonic implications of Indosinian granitoids from Western Qinling Orogen, China: Products of magma-mixing and fractionation
| Autor: | Anlin Guo, Xiao Xiong, M. Santosh, Jun Zheng, Lele Ding, Guowei Zhang, Hang Jiang, Laimin Zhu |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
MMEs
010504 meteorology & atmospheric sciences Granitoids lcsh:QE1-996.5 Geochemistry Window (geology) engineering.material 010502 geochemistry & geophysics 01 natural sciences Syn- to post-collisional transition Metallogeny lcsh:Geology Tectonics engineering General Earth and Planetary Sciences Igneous differentiation Western qinling orogen Magma mixing Fractionation Mafic Geology Biotite 0105 earth and related environmental sciences Petrogenesis Zircon |
| Zdroj: | Geoscience Frontiers, Vol 11, Iss 4, Pp 1305-1321 (2020) |
| ISSN: | 1674-9871 |
| Popis: | The Western Qinling Orogen (WQO) is characterized by voluminous distribution of Indosinian granitoids, the formation of which provides an important window to unravel the geochemical and geodynamic evolution and associated metallogeny. Here we investigate a group of intrusions termed “Five Golden Flowers” based on petrological, geochemical, zircon U–Pb geochronological and Lu–Hf isotopic studies on the granitoids and their mafic microgranular enclaves (MMEs). Our results show that these intrusions are genetically divided into two types, namely, magma-mixing and highly fractionated. The Jiaochangba, Lujing, Zhongchuan, and Luchuba granitoids are biotite monzogranites (220 ± 0.8 Ma to 217 ± 2.6 Ma) with abundant coeval MMEs (220 ± 1.1 Ma to 217 ± 2.7 Ma). The rocks contain moderate to high SiO2, high MgO, Rb, Sr, Ba, and Th contents, but low TiO2, P2O5, and Sc values, A/CNK of |
| Databáze: | OpenAIRE |
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