Geochronology and Sr–Nd–Hf isotopes of the Mesozoic granitoids from the Great Xing'an and Lesser Xing'an ranges: implications for petrogenesis and tectonic evolution in NE China

Abstract

The Great Xing′an and Lesser Xing′an ranges are characterized by immense volumes of Mesozoic granitoids. In this study, we present major and trace element geochemistry, U–Pb geochronology and systematic Sr–Nd–Hf isotopes for the representative samples, in order to constrain their petrogenesis and the tectonic evolution in NE China. The granitoids generally have high SiO2 (66.5–78.8 wt.%) and Na2O + K2O (7.0–8.9 wt.%) contents and belong to high‐K calc‐alkaline to shoshonitic series. All of them show enrichment in Rb, Th, U, Pb and light rare earth elements (LREE), and depletion in Nb, Ta, P and Ti. Zircon U–Pb dating suggests that there was continuous magmatism in both the Great Xing′an Range and the Lesser Xing′an Range during the Jurassic–Early Cretaceous interval. Seven Jurassic granitoids have (87Sr/86Sr)i values of 0.704351 to 0.707374, with ϵNd(t) values of −3.4 to 2.4 and ϵHf(t) values of 0.8 to 11.3, indicating that they originated from mixed sources involving depleted mantle and pre‐existing crustal components. One Early Cretaceous sample yields (87Sr/86Sr)i value of 0.706184, ϵNd(t) value of 0.6, and ϵHf(t) values of 7.0 to 8.2, which is in accordance with previous studies and indicates a major juvenile mantle source for the granitoids in this period. In the Jurassic, the magmatism in the Great Xing′an Range was induced by the subduction of the Mongol–Okhotsk Ocean, while the contemporaneous magmatism in the Lesser Xing′an Range was related to the subduction of the Palaeo‐Pacific Ocean. In the Early Cretaceous, extensive magmatism in NE China was probably attributed to large‐scale lithospheric delamination. Copyright © 2014 John Wiley & Sons, Ltd.

Geodynamic Evolution of Flat‐Slab Subduction of Paleo‐Pacific Plate: Constraints From Jurassic Adakitic Lavas in the Hailar Basin, NE China

“…(c) Simplified geological map of NE China, illustrating the distribution of Mesozoic igneous rocks in NE China (modified after Wu et al, ; Xu et al, ). Age data are from Zhang et al (), Li et al (), Wu et al (), Zhu et al (), Zhang et al (), Wu et al (), Zeng et al (), Chai et al (), She et al (), Ren et al (), Yang et al (), Wang et al (), Xu et al (, ), Sun et al (), Han et al (), Shi et al (), Li, Zhu, et al, , Li et al, , ), Tang et al (, , ), Hao et al (), Hu et al (), Dong et al (), Zhang et al (), Wang, Zhang, et al (), Qiao and Ma (), Zhang et al (), Ji et al (), and references therein.…”

Age of theYongxin Audeposit in theLesser Xing'an Range: Implications for anEarly Cretaceousgeodynamic setting for gold mineralization inNE China

“…The terrane is bound by the Zhangguangcai Range to the east, the southern Great Xing'an Range to the west, and Lesser Xing'an Range to the northeast (Figure c; Wang, Ren, et al, ; Wang, Liu, Wang, and Song, ; Ding et al, ; Shu, Ding, Ji, & Qu, ; Zhang et al, ; Zhang, Gao, et al, ). The Zhangguangcai and Lesser Xing'an ranges are characterized by large volume of Mesozoic granites and volcanic rocks and associated porphyry Mo and epithermal Au mineralization (Hu et al, ; Wu et al, ; Xu, Wang, et al, ).…”

Petrogenesis and tectonic setting of Carboniferous hornblende gabbros of the northern Great Xing'an Range, NE China: Constraints from geochronology, geochemistry, mineral chemistry, and zircon Hf isotopes

“…Mongol-Okhotsk tectonic systems (Gou, Sun, Liu, et al, 2013a;Gou, Sun, Ren, et al, 2013b;Gou, Sun, Ren, Hou, & Yang, 2017;Hu et al, 2016;Li, 2006;Liu, Wu, Qiu, & Li, 2015;Tang et al, 2013;Tang et al, 2014;Tang, Xu, Wang, Zhao, & Li, 2015;Tang et al, 2015;Tang, Xu, Wang, Zhao, & Wang, 2016;Wu et al, 2011;Yang, Sun, Gou, & Hou, 2017a;Yang, Sun, Hou, et al, 2017b;Zhao, Yu, Mao, et al, 2016). The Great Xing'an Range is located in the eastern segment of the CAOB between the West Lamulun River-Changchun-Yanji suture zone and the Mongol-Okhotsk suture belt and is divided into the Erguna Massif in the northwest and the Xing'an Massif in the southeast (Figure 1a-b).…”

“…The northeastern part of China is located in the eastern CAOB and consists of a collage of microcontinental massifs, including the Khanka, Jiamusi, Songnen–Zhangguangcai Range, Xing'an, and Erguna massifs, all of which are separated from each other by major faults (Ge, Sui, et al, ; Ge, Wu, Zhou, & Abdel Rahman, ; Ge, Wu, Zhou, & Zhang, ; Liu et al, ; Liu et al, ; Liu et al, ; Sun, Suzuki, Wu, & Lu, ; Sun, Wu, Li, & Lin, ; Sun, Wu, & Gao, ; Sun, Wu, Zhang, & Gao, ; Sun, Wu, Gao, & Lu, , Sun, Gou, & Wang, ; Wu, Jahn, Wilde, & Sun, ; Wu, Sun, Li, Jahn, & Wilde, ; Wu et al, ; Wu, Wilde, & Sun, ; Wu, Wilde, Sun, & Zhang, ; Xu, Ji, Pei, Yang, & Yu, ; Xu, Pei, et al, ; Xu, Wang, et al, ; Xu et al, ; Xu et al, ; Figure b). The Paleozoic tectonic development of this area was controlled by the evolution of the Paleo‐Asian Ocean between the Siberia and North China cratons, whereas the Mesozoic tectonic evolution of NE China was characterized by north–south extension and the overprinting of the circum‐Pacific and Mongol–Okhotsk tectonic systems (Gou, Sun, Liu, et al, ; Gou, Sun, Ren, et al, ; Gou, Sun, Ren, Hou, & Yang, ; Hu et al, ; Li, ; Liu, Wu, Qiu, & Li, ; Tang et al, ; Tang et al, ; Tang, Xu, Wang, Zhao, & Li, ; Tang et al, ; Tang, Xu, Wang, Zhao, & Wang, ; Wu et al, ; Yang, Sun, Gou, & Hou, ; Yang, Sun, Hou, et al, ; Zhang & Li, ; Zhao, Yu, Mao, et al, ). The Great Xing'an Range is located in the eastern segment of the CAOB between the West Lamulun River–Changchun–Yanji suture zone and the Mongol–Okhotsk suture belt and is divided into the Erguna Massif in the northwest and the Xing'an Massif in the southeast (Figure a–b).…”