Petrogenesis of Jurassic Granitoids on Liaodong Peninsula, Northeast China: Constraints on the Evolution of the Mongol-Okhotsk and Pacific Tectonic Regimes

Li, Jinyu; Qian, Ye; Tekoumc, Leontine; Zhao, Chengji; Sun, Jinlei; Zheng, Tao; Sun, Fengyue; Shen, Yanjie

doi:10.1007/s12583-020-1372-0

Cited by 8 publications

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“…However, recent studies indicate that the YFTB had already entered the postcollision stage prior to the Triassic (Ma Q et al, 2012;Zhang X H et al, 2012;Zhou et al, 2019;Zhu et al, 2020). The Nianzi granite unit, located in the Huairou District of Beijing and previously thought to be the earliest felsic intrusion during the Early Jurassic Yanshan intraplate compressional deformation (Li et al, 2021), has been found to belong to the Early Triassic pluton, based on new U-Pb data. This discovery suggests that the petrological, geochronological and geochemical features of these granites could help to resolve disputes regarding the tectonic evolution in the YFTB from the late Permian to the Triassic.…”

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confidence: 99%

Petrogenesis and Tectonic Implications of the Early Triassic Nianzi Adakitic Granite Unit in the Yanshan Fold and Thrust Belt: New Constraints from U‐Pb Geochronology and Sr‐Nd‐Hf Isotopes

ZHANG,

WU,

et al. 2024

Acta Geologica Sinica (Eng)

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The Nianzi granite unit, which includes the Nianzi, Xiaolianghou, and Xiawopu granite intrusions, is a significant component in the northern part of the North China Craton (NCC) and is situated in the Yanshan Fold and Thrust Belt (YFTB). However, there is still debate regarding the tectonic evolution history of the YFTB during the late Permian to Triassic period, specifically regarding the timing of subduction and collision between the NCC and Paleo‐Asian ocean. The Nianzi granite unit exhibits unique petrologic, geochronologic, and geochemical signatures that shed light on the tectonic evolution history of the YFTB. This study presents detailed petrology, whole‐rock geochemistry, and Sr‐Nd isotopic, zircon U‐Pb dating, and Lu‐Hf isotopic data of the granites within the Nianzi granite unit. Our findings demonstrate that the granites primarily comprise subhedral K‐feldspar, plagioclase, quartz, minor biotite and hornblende, and accessory titanite, apatite, magnetite, and zircon. Zircon U‐Pb dating indicates that the Xiaolianghou granite was emplaced at 247.5 ± 0.62 Ma. Additionally, the adakitic characteristics of the Nianzi, Xiawopu, and Xiaolianghou granite intrusions, such as high Sr and Ba contents and high ratios of Sr/Y and (La/Yb)N, combined with negative Sr‐Nd and Lu‐Hf isotopes (87Sr/86Sri = 0.705681–0.7057433, ɛNd(t) = −20.97 to −21.98, zircon ɛHf(t) = −9.92 to −20.26), as well as I‐type granite features of high SiO2, Na2O, and K2O/Na2O ratios, enriched Rb, K, Sr, and Ba, and depleted Th, U, Nb, Ta, P, and Ti, suggest that the Nianzi granite unit was mainly derived from the partial melting of a thickened lower crust containing hydrous, calc‐alkaline to high‐K calc‐alkaline, mafic to intermediate metamorphic rocks. In light of these parameters, we further integrate our data with previous studies and conclude that the Nianzi granite unit was generated in a post‐collisional extensional environment during the Early Triassic.

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