桂东南地区晚白垩世岩浆作用与构造动力学研究
Study on Late Cretaceous Magmatism and Tectonic Dynamics in Southeastern Guangxi
摘要: 桂东南及邻区(粤西、海南岛)位于华南板块南缘，地处太平洋构造域与特提斯构造域的交汇部位，是研究晚中生代大陆边缘动力学演化的关键区域。本文系统总结了该地区近年来发表的白垩纪岩浆岩年代学数据，结果显示晚白垩世岩浆活动可划分为两期：第一期(120~100 Ma)为构造体制转换期，早期(~116 Ma)以A型花岗岩记录古太平洋板块后撤引发的伸展，晚期(~104 Ma)以埃达克质岩及斑岩–矽卡岩型Cu-Mo矿化记录新特提斯洋脊俯冲(平板俯冲)引发的短暂挤压；第二期(102~79 Ma)为双后撤叠加伸展期，以广泛的A型花岗岩及W-Sn矿化为特征，受古太平洋板块俯冲后撤主导、新特提斯板块后撤协同的共同制约。值得注意的是，伸展背景的岩浆活动(~116 Ma)早于挤压背景的埃达克质岩(~104 Ma)，揭示了构造体制的快速转换，可能是古太平洋板块此时正处于后撤伸展阶段，导致桂东南地区为伸展背景，而新特提斯板块正处于北向俯冲，导致了挤压构造背景。
Abstract: Southeastern Guangxi and its adjacent areas (western Guangdong, Hainan Island) are located at the southern margin of the South China Block, at the intersection of the Pacific and Tethyan tectonic domains, making them a key region for studying the dynamic evolution of continental margins during the Late Mesozoic. This paper systematically summarizes recently published geochronological data on Cretaceous magmatic rocks in the region. The results show that Late Cretaceous magmatic activity can be divided into two stages. The first stage (120~100 Ma) is a tectonic regime transition period: its early part (~116 Ma) is characterized by A-type granites recording extension induced by the rollback of the Paleo-Pacific slab, while its late part (~104 Ma) is marked by adakitic rocks and porphyry‑skarn Cu‑Mo mineralization recording a transient compression event caused by Neo‑Tethyan ridge subduction (flat‑slab subduction). The second stage (102~79 Ma) is a double‑rollback extensional stage, characterized by widespread A-type granites and W‑Sn mineralization, jointly governed by the dominant rollback of the Paleo-Pacific slab and the cooperative rollback of the Neo‑Tethyan slab. It is noteworthy that the extensional magmatism (~116 Ma) predates the compressional adakitic rocks (~104 Ma), revealing a rapid tectonic regime transition. This may be explained by the fact that the Paleo-Pacific slab was in a rollback extensional phase at that time, resulting in an extensional setting in southeastern Guangxi, while the Neo‑Tethyan slab was undergoing northward subduction, which led to a compressional tectonic background.
文章引用：郭万幸. 桂东南地区晚白垩世岩浆作用与构造动力学研究[J]. 地球科学前沿, 2026, 16(5): 707-716. https://doi.org/10.12677/ag.2026.165065

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