Volume 10 Issue 2
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Kazem Kazemi, Ali Kananian, Yilin Xiao, Fatemeh Sarjoughian. Petrogenesis of Middle-Eocene granitoids and their Mafic microgranular enclaves in central Urmia-Dokhtar Magmatic Arc (Iran): Evidence for interaction between felsic and mafic magmas[J]. Geoscience Frontiers, 2019, 10(2): 705-723. doi: 10.1016/j.gsf.2018.04.006
Citation: Kazem Kazemi, Ali Kananian, Yilin Xiao, Fatemeh Sarjoughian. Petrogenesis of Middle-Eocene granitoids and their Mafic microgranular enclaves in central Urmia-Dokhtar Magmatic Arc (Iran): Evidence for interaction between felsic and mafic magmas[J]. Geoscience Frontiers, 2019, 10(2): 705-723. doi: 10.1016/j.gsf.2018.04.006

Petrogenesis of Middle-Eocene granitoids and their Mafic microgranular enclaves in central Urmia-Dokhtar Magmatic Arc (Iran): Evidence for interaction between felsic and mafic magmas

doi: 10.1016/j.gsf.2018.04.006
  • Received Date: 2017-09-23
  • Rev Recd Date: 2018-02-12
  • Publish Date: 2021-01-07
  • Whole rock major and trace element geochemistry together with zircon U-Pb ages and Sr-Nd isotope compositions for the Middle Eocene intrusive rocks in the Haji Abad region are presented. The granitoid hosts, including granodiorite and diorite, yielded zircon U-Pb ages with a weighted mean value of 40.0±0.7 Ma for the granodiorite phase. Mafic microgranular enclaves (MMEs) are common in these plutons, and have relatively low SiO2 contents (53.04-57.08 wt.%) and high Mg# (42.6-60.1), probably reflecting a mantle-derived origin. The host rocks are metaluminous (A/CNK=0.69-1.03), arc-related calc-alkaline, and I-type in composition, possessing higher SiO2 contents (59.7-66.77 wt.%) and lower Mg# (38.6-52.2); they are considered a product of partial melting of the mafic lower crust. Chondrite-normalized REE patterns of the MMEs and granitoid hosts are characterized by LREE enrichment and show slight negative Eu anomalies (Eu/Eu*=0.60-0.93). The host granodiorite samples yield (87Sr/86Sr)i ratios ranging from 0.70498 to 0.70591, positive εNd(t) values varying from +0.21 to +2.3, and TDM2 ranging from 760 to 909 Ma, which is consistent with that of associated mafic microgranular enclaves (87Sr/86Sr)i=0.705111-0.705113, εNd(t)=+2.14 to +2.16, TDM2=697-785 Ma). Petrographic and geochemical characterization together with bulk rock Nd-Sr isotopic data suggest that host rocks and associated enclaves originated by interaction between basaltic lower crust-derived felsic and mantle-derived mafic magmas in an active continental margin arc environment.
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