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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Paleogene structural development of the northern Song Hong Basin and adjacent areas: Implications for the role of extrusion tectonics in basin formation in the Gulf of Tonkin
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Paleogene structural development of the northern Song Hong Basin and adjacent areas: Implications for the role of extrusion tectonics in basin formation in the Gulf of Tonkin

机译：北宋洪盆地古代结构发展与邻近地区：对挤压构造在盆栽盆栽盆地形成中挤出构造作用的影响

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摘要

The Song Hong Basin situated at the distal part of the Ailaoshan-Red River Shear Zone (ASRRSZ) holds important information on the role of extrusion tectonics in the marginal basin development in the South China Sea. Based on an extensive dataset of 2 and 3-D seismic and stratigraphic information from 27 exploration wells, the Paleogene structural evolution of the northern Song Hong Basin and adjacent areas has been studied in detail. This study proposes a new Paleogene structural development model of the study area. Eocene-Oligocene rifting in the northern Song Hong Basin was driven by left-lateral shearing from the ASRRSZ associated with a combined motion of clockwise rotation and translation of the Indochina Block, which allowed extension along the "restraining bend" geometry of the basin's eastern margin. A structural high separates the Song Hong Basin from the Beibuwan Basin, inhibiting significant strike-slip displacement transfer from the ASRRSZ into rifting in the Beibuwan Basin. Strike-slip displacement from the ASRRSZ is maintained further south to the East Vietnam Boundary Fault segment. Thus, extension of the Beibuwan, Qiongdongnan and Phu Khanh Basins were the result of the interplay between extrusion and slab-pull tectonics. During the end of the Oligocene, reduced extrusion of Indochina caused minimal rotation of the block, and the remaining left-lateral displacement along the ASRRSZ was absorbed into inversion around the junction between the Song Hong and Beibuwan basins.
机译：宋洪盆地位于Ailaoshan-Red River Shear区的远端部分（ASRRSZ）的重要信息占据了挤出构造在南海边缘盆地发展中的作用。根据27次勘探井的2和3-D地震和地层信息的广泛数据集，详细研究了北宋洪盆地和邻近地区的古雄结构演变。本研究提出了研究区的新古古代结构发展模型。北宋洪盆地的零落寡烯序由ASRRSZ的左侧剪切驱动，与吲哚盖的顺时针旋转和翻译的组合运动相关联，这允许沿着盆地东部边缘的“抑制弯曲”几何形状的延伸。一个结构高，将宋洪盆地从北武湾盆地分开，抑制了北武湾盆地ASRRSZ的显着防滑位移转移。 ASRRSZ的防滑位移在东越南边界断线部门进一步维持。因此，北武湾，Qiongdongnan和Phu Khanh盆地的延伸是挤出和平板构造之间相互作用的结果。在寡核苷的结束期间，减少吲哚载物的挤出导致块的最小旋转，沿ASRRSZ的剩余左侧位移被吸收到歌曲洪和北武湾盆地之间的交界处的反转。

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