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首页> 外文期刊>Journal of Asian earth sciences >Tectonic-stratigraphic division and blind fold structures in Nansha Waters, South China Sea
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Tectonic-stratigraphic division and blind fold structures in Nansha Waters, South China Sea

机译：南海南沙海域的构造地层划分和盲褶构造

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Extensive multiple-channel reflection seismic data have been collected in the Nansha (Spratley Islands) Waters, the southern margin of the South China Sea. Stratigraphic correlation is shown with focus on a comprehensive geophysiXcal survey line run from offshore NW Sabah to offshore SE Vietnam. According to the varying tectono-stratigraphy from southeast to northwest, five tectonic belts can be determined, i.e. the Palawan-Borneo Nappe, Nansha Trough, Nanwei-Liyue Compressive Belt, Zheng'he Extensional Belt and the Circum-Southwest Subbasin Belt. In the Palawan-Borneo Nappe, Neogene-Quaternary deposits were highly upthrust northwestwards, resulting in a series of moderately to tightly folded anticlines separated by open synclines. The Nansha Trough was a narrow, deep-water belt filled with thick, undisturbed Neogene-Quaternary deposits. The Nanwei-Liyue Compressive Belt was dominated by strongly folded paleo-anticlines overlain by an undeformed sedimentary cap with a pronounced hiatus of Paleogene sediments. The Zheng'he Extensional Belt consisted of a rugged topography and Paleogene half-grabens bounded by listic faults. The major extensional faults were reactivated to cut through the overlying Neogene-Quaternary deposits. Over the Circum-Southwest Subbasin Belt, Neogene-Quaternary deposits draped on the largely subsided fault blocks related to the Late Oligocene-Mid-Miocene seafloor spreading. Based on the regional stratigraphic correlation, the prominent paleo-anticlines found within the Nanwei-Liyue Compressive Belt are deduced to consist of mainly Mesozoic marine sediments that were compressed in the Late Mesozoic Era. Therefore, the Nansha Microcontinent Block is shown to be a collision complex assembled during Late Mesozoic Era.
机译：在南海南部边缘的南沙（斯普拉特利群岛）水域，已经收集了广泛的多通道反射地震数据。显示了地层相关性，重点是从西北沙巴到海上越南越南的综合地球物理测量线。根据东南至西北构造地层的变化，可确定5个构造带，即巴拉望-婆罗洲推覆带，南沙海槽，南渭-丽月压缩带，正河伸展带和环西南次盆地带。在巴拉望婆罗洲纳皮，新近纪-第四纪沉积物高度向西北上推，导致一系列中度至紧密折叠的背斜，被开放向斜线隔开。南沙海槽是一条狭窄的深水带，充满了厚厚而不受干扰的新近纪第四纪沉积物。南威—李月压缩带以强烈褶皱的古anticantliness为主，上面覆盖着未变形的沉积盖，具有明显的古近纪沉积物裂隙。正河伸展带由崎list的地形和古近半断面组成，其地表断层为边界。重新激活了主要的伸展断层，以切穿上覆的新近纪第四纪沉积物。在近西南-盆地盆地上带，新近纪-第四纪沉积物覆盖在与渐新世-中-中新世晚期海底扩张有关的很大程度上消退的断块上。根据区域地层相关性，推论出南渭—李月压缩带内发现的主要古生界线主要由中生代晚期压缩的中生代海洋沉积物组成。因此，南沙微洲块被证明是晚中生代组装的碰撞复合体。

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