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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Geochemistry
Volume 12 - 2024 | doi: 10.3389/feart.2024.1444751

Petrogenesis and tectonic implications of Early Paleozoic granitoids in the Baoshan deposit, Guangxi, South China

Provisionally accepted
Puliang Lyu Puliang Lyu 1Fang Liu Fang Liu 2*Ling Chen Ling Chen 3Zhiguang Song Zhiguang Song 1Wenen Ma Wenen Ma 4Yanling Hou Yanling Hou 1
  • 1 Nanning Normal University, Nanning, Guangx, China
  • 2 Longyan University, Longyan, China
  • 3 Yibin University, Yibin, Sichuan, China
  • 4 Guangxi Zhuang Autonomous Region Geophysical Survey Institute, Liuzhou, China

The final, formatted version of the article will be published soon.

    The Early Paleozoic tectonic setting and geological processes of the South China Block (SCB) have long been a subject of debate. This study presented zircon U-Pb geochronology and Hf isotope, and whole-rock geochemical analyses for the Early Paleozoic granitoids in the Baoshan deposit of the Dayaoshan Uplift. LA-ICP-MS zircon U-Pb results suggest that the diorites, granite porphyries, granodiorites and its mafic microgranular enclaves (MMEs) in the Baoshan deposit formed at 449-430 Ma.Their formation ages are consistent with those of granite, MMEs and mafic rocks found in the Dayaoshan region. The granite porphyries, granodiorites, diorites and their MMEs in the Baoshan deposit have high Eu/Eu* ratios, low Zr+Nb+Y+Ce contents, 10000×Ga/ Al values, and A/CNK ratios (0.74-1.08), belonging to metaluminous to weakly peraluminous calc-alkaline I-type granitoids. Based on zircon Hf isotopic compositions (εHf(t) from -5.5 to +3.1), it is unlikely that these rocks were solely originated from a crustal source, and mantle-derived magma also played a significant role in the formation of these intrusive rocks.It is inferred that the granitoids in the Baoshan deposit were probably formed through the underplating of mantle-derived magmas during a transitional collision to extension tectonic setting, which led to the remelting of Mesoproterozoic crust.

    Keywords: Granitoids, Mafic microgranular enclaves, Early Paleozoic, Baoshan deposit, South China Block

    Received: 06 Jun 2024; Accepted: 08 Jul 2024.

    Copyright: © 2024 Lyu, Liu, Chen, Song, Ma and Hou. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Fang Liu, Longyan University, Longyan, China

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