Geochronology and Geochemistry of Early Cretaceous Granitic Plutons in the Xing'an Massif, Great Xing'an Range, NE China: Petrogenesis and Tectonic Implications

Abstract

In this study, we present zircon U-Pb ages, whole-rock geochemical data and Hf isotopic compositions for the Meiguifeng and Arxan plutons in Xing'an Massif, Great Xing'an Range, which can provide important information in deciphering both Mesozoic magmatism and tectonic evolution of NE China. The zircon U-Pb dating results indicate that alkali feldspar granite from Meiguifeng pluton was emplaced at ~145 to 137 Ma, and granite porphyry of Arxan pluton was formed at ~129 Ma. The Meiguifeng and Arxan plutons have similar geochemical features, which are characterized by high silica, total alkalis, differentiation index, with low P 2 O 5 , CaO, MgO, TFe 2 O 3 contents. They belong to high-K calc-alkaline series, and show weakly peraluminous characteristics. The Meiguifeng and Arxan plutons are both enriched in LREEs and LILEs (e.g., Rb, Th, U and K), and depleted in HREEs and HFSEs (e.g., Nb, Ta and Ti). Combined with the petrological and geochemical features, the Meiguifeng and Arxan plutons show highly fractionated I-type granite affinity. Moreover, the Meiguifeng and Arxan plutons may share a common or similar magma source, and they were probably generated by partial melting of Neoproterozoic high-K basaltic crust. Meanwhile, plagioclase, K-feldspar, biotite, apatite, monazite, allanite and Ti-bearing phases fractionated from the magma during formation of Meiguifeng and Arxan plutons. Combined with spatial distribution and temporal evolution, we assume that the generation of Early Cretaceous Meiguifeng and Arxan plutons in Great Xing'an Range was closely related to the break-off of Mudanjiang oceanic plate. Furthermore, the Mudanjiang Ocean was probably a branch of Paleo-Pacific Ocean.

Tectonic affinity and evolution of the Precambrian Qilian block: Insights from petrology, geochemistry and geochronology of the Hualong Group in the Qilian Orogen, NW China

“…Excepting the overgrowth rims of zircon from each sample, as well as a paragneiss sample (10GD4) that is more likely to be from the Huashishan Group instead of the Hualong Group, most zircon crystallized in the early Neoproterozoic with εHf (t) values from +6.31 to -3.32 and t DM2 model ages from 2013 to 1397 Ma, suggesting that the magmas of their source rocks mainly came from reworked Paleoproterozoic to Mesoproterozoic crustal sources. Whole rock εNd (t) values of -6.6 and -5.2 were obtained from two granite samples that intruded into the Huangyuan Group, with t DM2 model ages of 1.71 Ga and 1.61 Ga (Yong et al, 2008), also reflecting late Paleoproterozoic crustal growth in the Qilian block. Zircon Hf t DM model ages of 2013-1868 Ma from paragneiss 09HL14 in the Hualong Group are obtained.…”

“…These models disagree on the location of the suture zone and on polarity of subduction of the Paleo-Qilian oceanic lithosphere. For example, the crystallization ages of the granitic and mafic rocks in the eastern Qilian block are 459-434 Ma (Chen et al, 2008;He et al, 2008;Yong et al, 2008;Zhang et al, 2014;Yang et al, 2015), and these rocks have been mainly interpreted as the products of southward subduction of the North Qilian oceanic plate and subsequent collision between the Qilian block and the Alxa block (Chen et al, 2008;He et al, 2008;Yong et al, Song et al, 2013Song et al, , 2017Chen et al, 2009Chen et al, , 2013Yan et al, 2012). (b) Simplified geological map of the Qilian block (modified from Xia et al, 2016;Song et al, 2017;Chen et al, 2013;Xu et al, 2016;Zhang et al, 2017).…”

Final‐stage Southward Subduction of the Eastern Paleo‐Asian Ocean: Evidence from the Middle Permian Mafic Intrusions in the Northern Margin of the North China Craton

“…1a; Sengör et al, 1993;Xiao et al, 2003;Li, 2006;Wu et al, 2011;Xu et al, 2013;Zhou et al, 2016;Jing et al, 2022). The accretionary history of the eastern units including the Jiamusi Block and Nadanhada Terrane, which, together with the Sikhote-Alin Terrane of the Russian Far East and the Japanese islands, were controlled by the westward subduction of the Paleo-Pacific oceanic slab and characterized by subduction-related complexes, largescale NE-trending granites and volcanic belts, and strikeslip fault systems and basins (Wu et al, 2007(Wu et al, , 2011Yang et al, 2019;Ji et al, 2019a, b, c;Dong et al, 2019).…”

Geochemistry, geochronology, and zircon Hf isotopes of Late Jurassic–Early Cretaceous granitoids in the Xing'an Massif, NE China: Implication for the Late Mesozoic tectonic evolution and crustal growth

“…In the Early Cretaceous, the Paleo-Pacific Plate was subducted at a high-angle beneath the Eurasian continent (W. L. Xu, Pei, et al, 2013). Previously, precise geochronological and geochemical data have been obtained for the granitoids in Northeast China (Dong et al, 2014(Dong et al, , 2017Dong, Ge, Tian, et al, 2019;Feng et al, 2018; M. H. Ge, Zhang, Li, & Liu, 2018; J. Tang et al, 2014; J.…”