珠琼运动的厘定——来自北部湾盆地福山凹陷构造沉积特征的启示
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国家自然科学基金项目(41272122)资助。


Determination of Zhu-Qiong movement: The enlightenment from tectonic and sedimentary characteristics of Fushan Sag, Beibuwan Basin
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    摘要:

    提要:南海北部盆地构造运动的认识向来存有争议,尤其是在珠琼运动的厘定上更是难以统一。通过分析南海及其周缘盆地的动力学背景特征,认为珠琼运动为发生在始新世至渐新世的一次大型伸展构造运动,根据其动力学背景可分为两幕。北部湾盆地福山凹陷在珠琼运动期间表现出明显的两期伸展背景,分别对应珠琼运动的两次幕式活动。根据福山凹陷沉降速率变化、控沉积断裂与不同期次断裂分布特征,认为珠琼运动一幕的活动时间为早—中始新世,即54~39.4 Ma,动力学机制为印度洋板块俯冲欧亚板块引起东南方向的地幔流并导致太平洋板块俯冲后退;珠琼运动二幕的活动时间为晚始新世至渐新世,即39.4~25.5 Ma,起因于海南地幔柱柱头到达岩石圈底部引起东南方向的伸展效应。

    Abstract:

    Abstract: The understanding of tectonic activity in the north basins of South China Sea has long been controversial. It is especially difficult for researchers to hold identical views in the problem of the determination of the Zhu-Qiong movement. Based on the research on the dynamic setting in the South China Sea and its surrounding basin, the authors believe that the Zhu-Qiong movement was a great extensional tectonic activity between Eocene and Oligocene, and it could be divided two episodes according to the dynamics in different stages. Fushan Sag is located in the southeast corner of Beibuwan Basin, which is one of the northern basins of the South China Sea. The sag’s tectonic and sedimentary characteristics show that there existed two backgrounds of extensional structure during the Zhu-Qiong movement, corresponding respectively to two episodes of Zhu-Qiong movement. In addition, according to the characteristics of the change of sedimentary rate as well as the time of the formation of faults which controlled sedimentation and distribution of multi-phase faults, it is held that the activity of the first episode of Zhu-Qiong movement occurred in Early-Middle Eocene (54Ma-39.4Ma). Its dynamics mechanism was that the West Pacific plate drew back in subduction caused by SE-trending mantle flow under the subduction of Indian plate beneath Eurasian plate. And the activity of the second episode of Zhu-Qiong movement took place in Late Eocene to Oligocene (39.4Ma-25.5Ma). The dynamics mechanism of this stage was different from that of the previous phase, and the extensional effect of Hainan mantle plume action on the lithospheric bottom led to the tectonic activity in this episode.

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赵迎冬 甘华军 陈善斌 王观宏 王 祥 章诚诚. 珠琼运动的厘定——来自北部湾盆地福山凹陷构造沉积特征的启示[J]. 中国地质, 2015, 42(4): 948-959.
ZHAO Ying-dong, GAN Hua-jun, CHEN Shan-bin, WANG Guan-hong, WANG Xiang, ZHANG Cheng-cheng. Determination of Zhu-Qiong movement: The enlightenment from tectonic and sedimentary characteristics of Fushan Sag, Beibuwan Basin[J]. Geology in China, 2015, 42(4): 948-959(in Chinese with English abstract).

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