Multiscale ocean dynamics control the sedimentary source-to-sink processes in the southwestern Okinawa Trough (East China Sea)

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Marine Geology Pub Date : 2024-04-12 DOI:10.1016/j.margeo.2024.107285

Bowen Zhu , Zhigang Zeng , Fan Sun

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Abstract

The sedimentary source-to-sink processes remain under debate in the southwestern Okinawa Trough due to its complex oceanographic context. We employe a multidisciplinary approach combining marine sedimentology and physical oceanography to address the sedimentary source-to-sink processes. This study shows that the East China Sea shelf has been the provenance of the southwestern Okinawa Trough during the past 3000 a, judged from the detrital zircon U-Pb geochronology. Numerical simulations indicated that the bottom currents are the primary drivers that transport sediments from the East China Sea shelf continuously entering the southwestern Okinawa Trough. This study confirms that the source-to-sink system in the southwestern Okinawa Trough is controlled by multiscale ocean processes, and verifies that the sediments are mainly sourced from the East China Sea shelf in the past 3000 a. These arguments greatly improve our understanding on the sediment dispersal and have important implications on the climatic and oceanographic reconstructions.

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多尺度海洋动力学控制冲绳海槽（东海）西南部的沉积源-汇过程

由于冲绳海槽西南部复杂的海洋学背景，其沉积物从源到汇的过程仍存在争议。我们采用海洋沉积学和物理海洋学相结合的多学科方法来研究沉积源-汇过程。研究结果表明，根据锆英石U-Pb地质年代测定，东海大陆架在过去3000 a期间一直是冲绳海槽西南部的产地。数值模拟表明，底流是将沉积物从东海大陆架不断运入冲绳海槽西南部的主要驱动力。该研究证实了冲绳海槽西南部的源-汇系统受多尺度海洋过程的控制，并验证了过去 3000 a 的沉积物主要来自东海大陆架。

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来源期刊

Marine Geology 地学-地球科学综合

CiteScore

6.10

自引率

6.90%

发文量

175

审稿时长

21.9 weeks

期刊介绍： Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.