The Mesozoic-Cenozoic igneous intrusions and related sediment-dominated hydrothermal activities in the South Yellow Sea Basin, the Western Pacific continental margin

• Published in: Journal of marine systems 2018-04, Vol.180, p.152-161
• Main Authors: Yumao, Pang, Xunhua, Zhang, Guolin, Xiao, Luning, Shang, Xingwei, Guo, Zhenhe, Wen
• Format: Article
• Language: English
• Subjects: Hydrothermal vent complexes; Igneous intrusions; South Yellow Sea Basin; Western Pacific continental margin
• ISSN: 0924-7963; 1879-1573
• DOI: 10.1016/j.jmarsys.2016.11.011

Various igneous complexes were identified in multi-channel seismic reflection profiles from the South Yellow Sea Basin. It is not rare that magmatic intrusions in sedimentary basins cause strong thermal perturbations and hydrothermal activities. Some intrusion-related hydrothermal vent complexes have been identified and they are considered to originate from the deep sedimentary contact aureole around igneous intrusions and terminate in upper vents structures, and are linked by a vertical conduit system. The upper vent complexes are usually eye-shaped, dome-shaped, fault-related, crater-shaped or pock-shaped in seismic profiles. A schematic model was proposed to illustrate the structures of different types of hydrothermal vent complexes. A conceptual conduit model composed of an upper pipe-like part and a lower branching part was also derived. Hydrothermal vent complexes mainly developed during the Middle-Late Cretaceous, which is coeval with, or shortly after the intrusion. The back-arc basin evolution of the area which is related to the subduction of the Paleo-Pacific plate during the Mesozoic-Cenozoic may be the principal factor for voluminous igneous complexes and vent complexes in this area. It is significant to study the characteristics of igneous complexes and related hydrothermal vent complexes, which will have implications for the future study of this area. •Igneous intrusions are widespread in Mesozoic-Cenozoic in the South Yellow Sea Basin.•Hydrothermal vent complexes which are related to igneous intrusions are studied.•Different types of hydrothermal vent complexes and their structures are analyzed.•Hydrothermal vent complexes mainly developed during Middle-Late Cretaceous.