Structural development and tectonic evolution of Gunsan Basin (Cretaceous–Tertiary) in the central Yellow Sea
Structural development and tectonic evolution of Gunsan Basin (Cretaceous–Tertiary) in the central Yellow Sea
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DOI：
10.1016/j.marpetgeo.2009.11.001
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发表时间：
2010-02
影响因子：
4.2
通讯作者：
Y. Shinn;S. Chough;I. Hwang
中科院分区：
文献类型：
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作者：
Y. Shinn;S. Chough;I. Hwang
基于多道地震反射剖面和探井资料，对黄海中部群山盆地的构造发育进行了分析。盆地由三个凹陷（西部、中部和东部亚盆地）组成，充满了白垩纪至古近纪的厚（约6000米）非海相演替。它起源于早白垩世，是伊扎那吉板块在欧亚板块下的斜俯冲和郯庐断裂的左旋运动引起的陆内伸展。在晚白垩世-始新世，由于郯庐及其分支断裂的右向运动，盆地经历了张拉作用。盆内斜向正断层和中央次盆地北缘ne向边界断层的走滑（或斜滑）运动调节了拉张。整个盆地在渐新世发生构造反转时发生变形（NE-SW收缩），可能与郯庐断裂从右向左的走滑运动变化有关。中新世早期，由于原有的正断层和逆断层的重新激活，伸展活动恢复。伸展、隆升和侵蚀的综合作用导致了中新世早期演替的不同保存。早中新世末期，盆地伸展停止，收缩缓慢，随后盆地热沉降，海平面上升。
This study analyzes the structural development of the Gunsan Basin in the central Yellow Sea, based on multi-channel seismic reflection profiles and exploratory well data. The basin comprises three depressions (the western, central, and eastern subbasins) filled with a thick (ca. 6000m) Cretaceous to Paleogene nonmarine succession. It was initiated in the early Cretaceous due to intracontinental extension caused by oblique subduction of the Izanagi plate under the Eurasian plate and sinistral movement of the Tan-Lu fault. The basin appears to have undergone transtension in the late Cretaceous–Eocene, caused by dextral movement of the Tan-Lu and its branching faults. The transtension was accommodated by oblique intra-basinal normal faults and strike-slip (or oblique-slip) movement of a NE-trending bounding fault in the northern margin of the central subbasin. The entire basin was deformed (NE–SW contraction) in the Oligocene when tectonic inversion occurred, possibly due to the changes in strike-slip motion, from right- to left-lateral, of the Tan-Lu fault. During the early Miocene, extension resumed by reactivation of the pre-existing normal and transpressional faults. A combination of extension, uplift, and erosion resulted in differential preservation of the early Miocene succession. At the end of the early Miocene, extension ceased with mild contraction and then the basin thermally subsided with ensued rise in sea level.