Geochronology of a sedimentary core in the northwest of South China Sea and regional paleoenvironmental changes over the last million years

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY Continental Shelf Research Pub Date : 2024-09-01 DOI:10.1016/j.csr.2024.105322
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Abstract

The South China Sea (SCS) is ones of the largest marginal seas on the Earth. Apart from IODP/ODP sites, limited progress has been made in establishing chronostratigraphy for long-term geological sequences spanning millions of years. In this study, we present findings from a sediment core (NH-01) collected from the eastern part of Hainan Island, northwest SCS, in terms of magnetostratigraphy and sedimentary/paleoenvironmental changes in the past 1 Myr. The main findings are as follows: (1) Two magnetic polarity zones in core NH-01 can be preliminarily correlated with the upper part of the intervening Matuyama chron and the Brunhes normal chrons, respectively. (2) By tuning the color indices of core NH-01 to the stacked benthic δ18O record, the age-depth model was refined, and the sediment accumulation rates are estimated as 10–30 cm/kyr (3) The sedimentary processes in the study area display a dominant 100-kyr cycle, with contributions from precession and obliquity bands, underscoring the influence of regional sea-level changes and monsoonal evolution. Comparisons between the NH-01 sedimentary record and various global climate proxies indicate a significant shift in regional sedimentary processes around 430 kyr, which can be attributed to the pronounced impact of the

Mid-Brunhes event, potentially linking it to climatic changes in the Southern Hemisphere. Consequently, sedimentary records from the northwest SCS not only capture regional environmental history but also provide insights into potential connections between different climatic systems.

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南海西北部沉积岩芯的地质年代与过去一百万年的区域古环境变化
中国南海(SCS)是地球上最大的边缘海之一。除了国际大洋钻探计划(IODP)/世界大洋钻探计划(ODP)的地点外,在建立跨越数百万年的长期地质序列的年代地层学方面取得的进展有限。在本研究中,我们介绍了从南中国海西北部海南岛东部采集的一个沉积岩芯(NH-01)在磁地层学和过去 1 百万年沉积/古环境变化方面的发现。主要发现如下(1)NH-01岩芯中的两个磁极性带可分别与间断的松山纪上部和布鲁内斯正长岩初步相关。(2) 根据叠层底栖生物δ18O记录调整岩芯NH-01的颜色指数,完善了年龄-深度模型,估计沉积速率为10-30 cm/kyr (3) 研究区的沉积过程以100-kyr为主要周期,并有前倾带和偏斜带的贡献,突出了区域海平面变化和季风演化的影响。NH-01 沉积记录与各种全球气候代用指标的比较表明,在 430 千年左右,区域沉积过程发生了显著变化,这可归因于中布鲁内斯事件的明显影响,可能与南半球的气候变化有关。因此,来自南中国海西北部的沉积记录不仅记录了区域环境历史,而且还提供了不同气候系统之间潜在联系的见解。
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来源期刊
Continental Shelf Research
Continental Shelf Research 地学-海洋学
CiteScore
4.30
自引率
4.30%
发文量
136
审稿时长
6.1 months
期刊介绍: Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.
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