Geochronology, geochemistry and tectonic implications of Weitingchagan composite pluton in northern segment of the Xing‐Meng Orogenic Belt

Abstract

We undertook zircon U–Pb dating and geochemical analyses of the Weitingchagan (WT) pluton in the Dong Ujimqi area, Northeast China, with an aim of determining their ages, petrogenesis and sources, which are important for understanding the Late Palaeozoic tectonic evolution of the Xing‐Meng Orogenic Belt. The WT pluton consists of coarse‐ to medium‐grained porphyritic granites in the core and medium‐ to fine‐grained monzogranites in the rim, contains abundant microgranular enclaves and is intruded by small amounts of muscovite monzogranites. The results of LA‐ICP‐MS zircon U–Pb dating indicate that the WT composite pluton formed during the Late Carboniferous–Early Permian with the ages ranging from 289 Ma to 312 Ma. Petrological and geochemical characteristics of the WT pluton were derived from the partial melting of crustal materials, and the AFC process played an important role in the magmatic evolution. The porphyritic granites are I‐type granite, and the monzogranites and muscovite monzogranites are highly fractionated I‐type granite. Combined with previous studies on the contemporaneous magma‐tectonic activities in the Uliastai Continental Margin, the study suggests that the WT pluton formed in an extensional environment, which may relate to the closure of the Palaeo‐Asian Ocean. Copyright © 2016 John Wiley & Sons, Ltd.

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

“…In combination with our new LA‐ICP‐MS U–Pb ages from the QJC pluton, we suggest that the pluton is a composite pluton composed of two phases of magmatic activities in XMC, with the ages of 300~312 Ma and ~280 Ma. In the near area, such as the Uliastai continental margin, the magmatic activities during the Carboniferous to the Permian also is characterized by two phases (Liu et al, ; Tong et al, ; Xin, Teng, & Cheng, ; Zhang et al, ).…”

Petrogenesis of Early Cretaceous adakites from the Liaodong Peninsula: insight into the lithospheric thinning of the North China Craton

“…2004; Liu et al . 2019). According to the results of previous research, some Early Cretaceous A-type granites and alkaline rocks have been reported in the Liaoning Peninsula – for example, Qianshan granite (127 Ma), Taipingshan alkaline feldspar granite (129 Ma), Guanmenshan Granite porphyry (126 Ma) and quartz syenite (127 Ma) – which indicate that the Liaodong Peninsula existed in an extensional tectonic setting (Yang et al .…”

“…2007 a , b ; Liu et al . 2016, 2019). Metamorphic core complexes (MCC) are also widely developed in the Liaoning Peninsula; for example, the Yinmawan (129–120 Ma) and Gudaoling (127–118 Ma) plutons were emplaced along the detachment fault of the Liaonan–Wanfu MCC (130–113 Ma), which was in an extensional tectonic environment (Guan et al .…”

New evidence from the Wuliji'Oboo fluorite deposit for the role of the paleo‐Pacific Plate and Mongol–Okhotsk suture in creating extensive fluorite mineralization in the Great Xing'an Range, NE China

“…The Nb‐Ta and Zr‐Hf relations have been employed as a useful tool to trace magma sources (Dostal & Chatterjee, ; Green, ; Liu et al, ; McCulloch & Gamble, ). The Nb/Ta (8.91–10.00, average: 9.56) and Zr/Hf (18.98–24.66, average: 20.77) ratios of the volcanic rocks are closer to those in the crust (11.4 and 33, respectively) than primitive mantle (17.8 and 37, respectively).…”