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

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-07-29 DOI:10.3389/feart.2024.1444751

Puliang Lyu, Fang Liu, Ling Chen, Zhiguang Song, Wenen Ma, Yanlin Hou

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Abstract

The Early Paleozoic tectonic setting and geological processes of the South China Block 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 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, 10,000×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.

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华南广西宝山矿床早古生代花岗岩的岩石成因及构造影响

华南地块的早古生代构造背景和地质过程一直是争论的焦点。本研究介绍了大瑶山隆起宝山矿床早古生代花岗岩的锆石U-Pb地质年代、Hf同位素和全岩地球化学分析。LA-ICP-MS锆石U-Pb结果表明，宝山矿床中的闪长岩、花岗斑岩、花岗闪长岩及其黑云母微晶飞地形成于449-430Ma。它们的形成年代与大瑶山地区发现的花岗岩、岩浆岩和岩浆岩的形成年代一致。宝山矿床中的花岗斑岩、花岗闪长岩、闪长岩及其MME具有较高的Eu/Eu*比值、较低的Zr+Nb+Y+Ce含量、10,000×Ga/Al值和A/CNK比值（0.74-1.08），属于金属铝质至弱过铝质钙碱性I型花岗岩。根据锆石Hf同位素组成（εHf(t)从-5.5到+3.1），这些岩石不太可能完全源自地壳，地幔岩浆在这些侵入岩的形成过程中也发挥了重要作用。据此推断，宝山矿床中的花岗岩很可能是在由碰撞构造向延伸构造过渡的构造环境中，由地幔源岩浆下沉，导致中新生代地壳重熔而形成的。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.