南海中央海盆海底初始扩张时间的重新认定

doi:10.11978/2023079

摘要/Abstract

摘要：

由于磁异常条带识别的不确定性而使其具有多解性, 因此对于应用磁异常条带对比得出的南海中央海盆海底初始扩张时间一直存在较大的争议。随着南海勘探活动的不断深入和资料的大量积累, 有必要对这一重要问题给予重新认定。最新研究发现: 南海中央海盆初始扩张区域的南、北边缘发育晚始新世—早渐新世(T₇—Tog)沉积层序, 说明洋壳基底之上的最早沉积层年代要老于原来认识的32—33Ma。在南海, 持续时间长、活动强烈、形成近东—西向构造体系的变革运动发生时间为40Ma左右。南海陆缘不整合面对比证实, 将T₈界面(37.2—40Ma)作为南海初始扩张的破裂不整合面更为准确。由此得出结论, 南海中央海盆海底初始扩张时间应为39—40Ma 左右。

关键词: 海底初始扩张时间, 磁异常条带对比, 洋壳基底, 东—西向构造体系, 南海中央海盆

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

邱燕, 鞠东, 黄文凯, 王英民, 聂鑫. 南海中央海盆海底初始扩张时间的重新认定[J]. 热带海洋学报, 2024, 43(2): 154-165.

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.

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