南海中央海盆海底初始扩张时间的重新认定

doi:10.11978/2023079

Abstract

Abstract:

There are a lot of disputes over the initiation time of seafloor spreading in the Central Basin of South China Sea by comparison of magnetic lineations due to its multiplicity. It is necessary to re-define this important node of time because of data and new result accumulation in the SCS during the recent decades. It has been verified by this study that the Late Eocene and early Oligocene strata (T₇—Tog sequence) developed at southern and northern sides of initial spreading areas in the Central Basin, which indicates that the geological age of bottom stratum on oceanic basement was older than 32—33 Ma. At continental margins of the SCS, the structure movement of long lasting time, intensively activity and forming a structure system of E-W trend in the SCS took place approximately at 40 Ma, and it is more precise to take seismic reflector T₈ (37.2—40 Ma) as the break-up of the initial seafloor spreading of the Central Basin according to the comparison of unconformities. Therefore, the conclusion is the initial time of seafloor spreading of the Central basin was roughly 39—40 Ma.

Key words: initial time of seafloor spreading, comparison of magnetic lineations, oceanic basement, structure system with E—W trend, Central Basin of the SCS

QIU Yan, JU Dong, HUANG Wenkai, WANG Yingmin, NIE Xin. Re-determination of the initiation time of the seafloor spreading of the Central Basin, South China Sea[J].Journal of Tropical Oceanography, 2024, 43(2): 154-165.

Figures/Tables 11

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Re-determination of the initiation time of the seafloor spreading of the Central Basin, South China Sea

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References 39

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