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• W2720889788 abstract "We conducted zircon U–Pb dating and geochemical analyses for the Qianjinchang (QJC) pluton in the Xi Ujimqi, Northeast China, with an aim to determine their ages, petrogenesis, and sources. The QJC pluton consists of coarse/medium‐grained biotite monzogranite in the core and fine‐grained biotite granodiorite in the rim; those rocks intrude into quartz diorite but are intruded by minor intrusive phases, including small biotite syenogranite, diorite bodies, late diorite, granodiorite, granite, and pegmatite dykes. Our new laser ablation inductively coupled plasma mass spectrometry zircon U–Pb data indicate that the QJC composite pluton composed of 2 phases of magmatic activities, with the ages of 301~313 Ma for the quartz diorite, 283 ± 1 Ma for the biotite granodiorite, 280 ± 1 Ma for the biotite syenogranite, and 280 ± 2 Ma for the diorite dyke. Hf isotopic analyses for the quartz diorite sample show ε Hf (t) = 3.75 to 11.72, with 2‐stage Hf model age ( T DM2 ) ranging 568–1,078 Ma. The biotite syenogranite sample also shows a depleted ε Hf (t) = 4.47 to 8.71, with T DM2 ranging 745–1,015 Ma, suggesting the major involvement of juvenile crustal components. The various ε Hf values of the QJC pluton indicate a hybrid magma source of juvenile material with old crustal component, and the T DM2 values increase from the Carboniferous to Permian, which suggests an increasing proportion of old continental material during this period. Petrological and geochemical characteristics of the biotite granodiorite and biotite monzogranite samples suggest that they are S‐type granites and derived from partial melting of the clay‐poor, plagioclase‐rich psammitic source, produced at low‐medium pressure. The biotite syenogranite sample belongs to alkaline and shoshonitic series and probably formed by a hybridization process between basaltic magma and old continental components. Combined with previous studies on the contemporaneous magma‐tectonic activities in the Xilinhot microcontinent, we suggest that the QJC pluton formed in a postcollisional setting." @default.
• W2720889788 created "2017-06-30" @default.
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• W2720889788 date "2017-06-19" @default.
• W2720889788 modified "2023-10-06" @default.
• W2720889788 title "Geochemistry and zircon U-Pb-Hf isotopes of the granitoids of Qianjinchang pluton in the Xi Ujimqi, Inner Mongolia: Implications for petrogenesis and geodynamic setting" @default.
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• W2720889788 doi "https://doi.org/10.1002/gj.2926" @default.
• W2720889788 hasPublicationYear "2017" @default.
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