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Sill-related seafloor domes in the Zhongjiannan Basin, western South China Sea
Marine and Petroleum Geology ( IF 4.2 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.marpetgeo.2020.104669
Minghui Geng , Haibin Song , Yongxian Guan , Jiangxin Chen , Ruwei Zhang , Baojin Zhang , Xudong Zhang

Abstract Magmatism can exert significant impact on sedimentary basins such as the Zhongjiannan Basin (ZJNB), western South China Sea. We have evaluated multibeam bathymetric and multichannel seismic reflection data acquired by the Guangzhou Marine Geological Survey in recent years, in order to investigate the distribution, the characteristics and the subsurface structures related to seafloor domes found in the northeastern ZJNB. Our data revealed forty-two domes at water depths between 2312 m and 2870 m, which are clustered around volcanic mounds, large seamounts and along the edge of the central depression in the study area. These domes are generally circular to elongate or irregular in plan view with large basal areas, and they also have gentler flanks (dips of 1.46°–7.73°) with vertical reliefs ranging from tens to hundreds of meters. In seismic sections, majority of the domes are underlain by variably shaped and complex magmatic sills, which provide a cause-effect relationship between domes formation and igneous intrusions. These intrusions heat surrounding organic-rich sediments, release hydrocarbons, fluidize sediment pore waters and form gas-rich fluids, which fill in sediment and uplift overlying strata immediately above the sills to form forced folds, which are manifested as seafloor domes. These sill-folds-dome structures have important implications for understanding geomorphologic features caused by sills emplaced at depth.

中文翻译:

南海西部中建南盆地与窗台有关的海底穹窿

摘要 岩浆作用对南海西部中建南盆地(ZJNB)等沉积盆地具有重要影响。我们对广州海洋地质调查局近年来获得的多波束测深和多道地震反射数据进行了评估,以研究ZJNB东北部发现的与海底穹顶相关的分布、特征和地下结构。我们的数据揭示了 2312 米和 2870 米之间水深的 42 个圆顶,它们聚集在火山丘、大型海山和研究区中央凹陷的边缘。这些圆顶在平面视图中通常呈圆形至细长形或不规则形,基部面积较大,它们的侧面也较平缓(倾角为 1.46°–7.73°),垂直起伏范围从数十米到数百米不等。在地震剖面中,大多数穹窿下伏着形状各异且复杂的岩浆基岩,这在穹窿形成和火成岩侵入之间提供了因果关系。这些侵入体加热富含有机物的沉积物周围,释放出碳氢化合物,使沉积物孔隙水流化并形成富含气体的流体,这些流体填充沉积物并抬升紧接在基台上方的上覆地层,形成强制褶皱,表现为海底穹顶。这些窗台褶皱圆顶结构对于理解由深埋的窗台引起的地貌特征具有重要意义。释放碳氢化合物,流化沉积物孔隙水,形成富气流体,充填沉积物,抬升上覆地层紧邻地基,形成强制褶皱,表现为海底穹窿。这些窗台褶皱圆顶结构对于理解由深埋的窗台引起的地貌特征具有重要意义。释放碳氢化合物,流化沉积物孔隙水,形成富气流体,充填沉积物,抬升上覆地层紧邻地基,形成强制褶皱,表现为海底穹窿。这些窗台褶皱圆顶结构对于理解由深埋的窗台引起的地貌特征具有重要意义。
更新日期:2020-12-01
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