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Stratigraphic architectures and associated unconformities of Pearl River Mouth basin during rifting and lithospheric breakup of the South China Sea
Marine Geophysical Research ( IF 1.4 ) Pub Date : 2019-01-29 , DOI: 10.1007/s11001-019-09378-6 Xinong Xie , Jianye Ren , Xiong Pang , Chao Lei , Hui Chen
Marine Geophysical Research ( IF 1.4 ) Pub Date : 2019-01-29 , DOI: 10.1007/s11001-019-09378-6 Xinong Xie , Jianye Ren , Xiong Pang , Chao Lei , Hui Chen
The lithosphere breakup processes from initial rifting of the crust to the complete rupture of the lithosphere underwent several tectonic evolution stages and resulted in the formation of a distinct stratigraphic architecture and associated unconformities. In this study, a dense grid of seismic profiles tied to industrial borehole data are used to investigate the stratigraphic architecture and unconformity interfaces in the Pearl River Mouth basin of the northern South China Sea margin. The Pearl River Mouth typed rifted margin evolved from stretching, thinning, to finally seafloor spreading. Our results indicate that a distinct stratigraphic architecture with well defined unconformities are formed in the proximal to distal zone of the margin. The syn-rift strata have been constrained by the top of basement unconformity and the lithosphere breakup unconformity. Polyphase rift strata during lithospheric rupture process are mainly controlled by two fault patterns, high-angle normal faults and low-angle detachment faults. In the proximal domain, multiple episodes of syn-rift strata are characterized by vertical superimposed half-graben or graben type stratigraphic patterns separated by crack-related unconformity. However, in the more distal zones, syn-rift strata composed two distinct intervals separated by detachment-related unconformity, including small-scaled dispersed half-graben or graben at the lower part and large-scaled wide syn-detachment depression at the upper part. Based on these observations we provide an effective method for the correlation of sedimentary strata from the proximal to distal domains of the passive rifted margins during the lithospheric rupture process.
中文翻译:
南海裂谷和岩石圈破裂期间珠江口盆地的地层构造及相关不整合面
从地壳初始裂谷到岩石圈完全破裂的岩石圈破裂过程经历了几个构造演化阶段,并导致形成了独特的地层构造和相关的不整合面。在这项研究中,将密集的地震剖面网格与工业钻孔数据联系起来,以研究南海北部边缘珠江口盆地的地层构造和不整合面。珠江口型裂谷边缘从伸展,变薄到最终海底扩展演变。我们的结果表明,在边缘的近端到远端区域形成了具有明确不整合面的独特地层构造。同裂谷地层受到基底不整合顶部和岩石圈破裂不整合的限制。岩石圈破裂过程中的多相裂谷地层主要受两种断层控制,即高角度法向断层和低角度脱离断层。在近端区域,同裂隙地层的多次发作以垂直叠加的半岩状或ben陷型地层样式为特征,这些地层样式被裂缝相关的不整合面分开。然而,在较远的区域,同裂隙地层包括两个不同的层段,这些层段由与剥离有关的不整合面隔开,包括下部的小范围分散的半粒状或or陷和上部的大规模宽范围的同向分离凹陷。
更新日期:2019-01-29
中文翻译:
南海裂谷和岩石圈破裂期间珠江口盆地的地层构造及相关不整合面
从地壳初始裂谷到岩石圈完全破裂的岩石圈破裂过程经历了几个构造演化阶段,并导致形成了独特的地层构造和相关的不整合面。在这项研究中,将密集的地震剖面网格与工业钻孔数据联系起来,以研究南海北部边缘珠江口盆地的地层构造和不整合面。珠江口型裂谷边缘从伸展,变薄到最终海底扩展演变。我们的结果表明,在边缘的近端到远端区域形成了具有明确不整合面的独特地层构造。同裂谷地层受到基底不整合顶部和岩石圈破裂不整合的限制。岩石圈破裂过程中的多相裂谷地层主要受两种断层控制,即高角度法向断层和低角度脱离断层。在近端区域,同裂隙地层的多次发作以垂直叠加的半岩状或ben陷型地层样式为特征,这些地层样式被裂缝相关的不整合面分开。然而,在较远的区域,同裂隙地层包括两个不同的层段,这些层段由与剥离有关的不整合面隔开,包括下部的小范围分散的半粒状或or陷和上部的大规模宽范围的同向分离凹陷。