Neoproterozoic magmatic and metamorphic imprints in the East Kunlun Orogenic Belt, North Tibetan Plateau, NW China: Implications for the assembly and initial breakup of the Rodinia supercontinent

Wu, Dongqian; Sun, Fengyue; Pan, Zhongcui; Yu, Lu; Li, Liang; Gao, Huimin; Tian, Nan; Xu, Chengyu

doi:10.1016/j.precamres.2020.106076

Cited by 14 publications

(3 citation statements)

References 111 publications

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“…Recent zircon U-Pb analyses of these rocks have yielded protolith ages of 910-978 Ma [26][27][28][29]. Numerous contemporary peraluminous granitic gneisses have been recognized in adjacent blocks including the Altun-Qilian-Kunlun-North Qaidam (AQKNQ) region [53][54][55][56][57][58][59][60][61].…”

Section: Regional Geology and Petrographymentioning

confidence: 99%

“…These characteristics suggest that their protolith was peraluminous granite. Early Neoproterozoic peraluminous granites have also been identified in the eastern part of the NQT and AQKNQ [20,27,31,37,38,[55][56][57]60,61,136]). The combined zircon U-Pb-Hf-O isotopic compositions of the early Neoproterozoic peraluminous granites from the QOB (Figures 10 and 11) confirmed that these rocks were derived predominantly from the partial melting of supracrustal sedimentary rocks.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

“…Peraluminous granites are generally considered to form in syn-collisional settings [135,137,138]. Early Neoproterozoic peraluminous granites in the eastern part of the NQT and AQKNQ are thought to have formed during syn-collisional processes associated with the assembly of the Rodinia supercontinent [20,27,31,37,38,[55][56][57]60,61,136]. Similarities in age and tectonic setting suggest a correlation of Neoproterozoic granitic magmatism between the NQT and AQKNQ.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

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Petrogenesis and Tectonic Implications of the Neoproterozoic Peraluminous Granitic Rocks from the Tianshui Area, Western Margin of the North Qinling Terrane, China: Evidence from Whole-Rock Geochemistry and Zircon U–Pb–Hf–O Isotopes

Yang

Zhang

et al. 2022

Minerals

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The source and petrogenesis of peraluminous granitic rocks in orogenic belts can provide insights into the evolution, architecture, and composition of continental crust. Neoproterozoic peraluminous granitic rocks are sporadically exposed in the Tianshui area of the western margin of the North Qinling Terrane (NQT), China. However, the source, petrogenesis, and tectonic setting of these rocks still remain unclear, which limits our understanding of the Precambrian tectonic and crustal evolution of the Qinling Orogenic Belt (QOB). Here, we determined the whole-rock geochemical compositions and in situ zircon U–Pb ages, trace-element contents, and Hf–O isotopic compositions of a series of peraluminous granitic mylonites and granitic gneisses in the Tianshui area at the west end of North Qinling. Zircon U–Pb dating revealed that the protoliths of the studied granitic mylonites and granitic gneisses crystallized at 936–921 Ma. The granitic rocks displayed high A/CNK values (1.12–1.34) and were enriched in large-ion lithophile elements (e.g., Rb, Ba, Th, U, and K) and light rare earth elements, and they were depleted of high-field-strength elements (e.g., Nb, Ta, and Ti). These rocks showed variable zircon εHf(t) (−12.2 / 9.7) and δ18O (3.56‰ / 11.07‰) values, suggesting that they were derived from heterogeneous crustal sources comprising predominantly supracrustal sedimentary rocks and subordinate igneous rocks. In addition, the U–Pb–Hf isotopic compositions from the core domains of inherited zircons were similar to those of detrital zircons from the Qinling Group, suggesting that the Qinling Group was an important crustal source for the granitic rocks. The lithological and geochemical features of these granitic rocks indicate that they were generated by biotite dehydration melting of heterogeneous sources at lower crustal depths. Combining our results with those of previous studies, we suggest that the NQT underwent a tectonic transition from syn-collision to post-collision at 936–874 Ma in response to the assembly and breakup of the Rodinia supercontinent.

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