Stratigraphic and chronological characteristics of Shidao Island within the Xisha Islands, South China Sea, and its response to sea-level changes since the Late Pleistocene,Geological Journal

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Stratigraphic and chronological characteristics of Shidao Island within the Xisha Islands, South China Sea, and its response to sea-level changes since the Late Pleistocene
Geological Journal ( IF 1.4 ) Pub Date : 2022-07-22 , DOI: 10.1002/gj.4549
Yuzhe Wang ₁ , Longwei Qiu ₁ , Hong Xu ₂ , Daotao Dong ₁ , Baoliang Yang ₁ , Danish Khan ₁ , Heping Fu ₁ , Yarui Su ₁ , Xiantong Liu ₁

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Sedimentological and chronological analyses of coastal dunes can determine their sedimentation processes and yield information that can reflect changes in local marine environments (e.g., information on climate, biology, and sea-level changes in tectonically stable areas). In this study, Late Quaternary deposits on Shidao Island, one of the Xisha Islands, South China Sea, were analysed using techniques such as U/Th dating to obtain the following results: (1) Four lithofacies associations and two unconformities were identified from the deposits on Shidao Island. On this basis, the Shidao Island sediments can be divided into three stages of aeolian sediments and one stage of beach rock sediments. (2) U/Th dating revealed that the aeolian deposits on Shidao Island formed during three periods, namely, marine isotope stages 5.2, 5.1, and 4, and that the beachrocks were formed in the Holocene when the sea level rose to its present height. (3) The aeolianites on Shidao Island all formed in an environment in which the sea level was relatively stable or slowly falling. This study determined for the first time the specific sedimentary ages of the aeolianites on Shidao Island, and reconstructed the sedimentation process of the deposits on Shidao Island based on palaeo-sea-level changes. These results can provide more reliable geochronology data for the future study of Late Quaternary marine environments across the East Asian region.

中文翻译：

南海西沙群岛石岛地层年代学特征及其对晚更新世以来海平面变化的响应

沿海沙丘的沉积学和年代学分析可以确定它们的沉积过程并产生可以反映当地海洋环境变化的信息（例如，有关气候、生物和构造稳定地区海平面变化的信息）。本研究对南海西沙群岛石岛晚第四纪沉积物进行了U/Th定年等技术分析，得到以下结果：（1）从海平面上识别出4个岩相组合和2个不整合面。石岛的沉积物。在此基础上，石岛岛沉积可分为三期风成沉积和一期滩岩沉积。(2) U/Th测年揭示石岛风成沉积形成于海洋同位素5.2、5.1、4期三个时期，并且当海平面上升到现在的高度时，海滩岩石形成于全新世。(3)石岛风积岩均形成于海平面相对稳定或缓慢下降的环境中。本研究首次确定了石岛风积岩的具体沉积年龄，并根据古海平面变化重构了石岛沉积物的沉积过程。这些结果可为今后东亚地区晚第四纪海洋环境研究提供更可靠的年代学数据。本研究首次确定了石岛风积岩的具体沉积年龄，并根据古海平面变化重构了石岛沉积物的沉积过程。这些结果可为今后东亚地区晚第四纪海洋环境研究提供更可靠的年代学数据。本研究首次确定了石岛风积岩的具体沉积年龄，并根据古海平面变化重构了石岛沉积物的沉积过程。这些结果可为今后东亚地区晚第四纪海洋环境研究提供更可靠的年代学数据。

更新日期：2022-07-22

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