Holocene Tephrostratigraphy in the East Sea/Japan Sea: Implications for Eruptive History of Ulleungdo Volcano and Potential for Hemispheric Synchronization of Sedimentary Archives
Holocene Tephrostratigraphy in the East Sea/Japan Sea: Implications for Eruptive History of Ulleungdo Volcano and Potential for Hemispheric Synchronization of Sedimentary Archives
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DOI：
10.1029/2021jb023243
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发表时间：
2022-02
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通讯作者：
X.‐Y. Chen;S. Blockley;R. Fletcher;S. Zhang;J.‐H. Kim;M-H. Park;C. Chen;J. Yin;Y.‐G. Xu
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作者：
X.‐Y. Chen;S. Blockley;R. Fletcher;S. Zhang;J.‐H. Kim;M-H. Park;C. Chen;J. Yin;Y.‐G. Xu
东亚的活火山对周边地区构成潜在威胁。人们对日本许多火山的喷发历史都很了解，但它们的扩散路径往往是基于可见的火山带。此外，该地区的其他重要火山仍需要更深入地了解它们的喷发潜力。本文对东海西南部13PT‐P4海相岩心中保存的全新世隐火虫记录进行了研究，以期更好地重建过去的火山喷发事件及其扩散过程。在韩国（郁陵岛）、中国/朝鲜（长白山）和日本（Kikai）确定了6个分布广泛的温层，并与它们的源火山进行了对比，更新了它们的分布范围。我们的研究结果将13PT‐P4序列列为东海全新世记录中温度约束最强烈的序列，这使得该中纬度档案可以与北极和热带地区的记录同步。利用陆基温度来约束海相储层效应和记录的年龄-深度模型。该区平均储层年龄为1150±30 14C年（约7.3 ~ 5.6 cal ka BP）， 1565±30 14C年（约1.0 cal ka BP）。这些观测到的储层年龄变化可能表明在区域尺度上有活跃的上升流。此外，我们提供了详细的年龄估计和以前知之甚少的Ulleungdo火山喷发（U‐1）的玻璃地球化学，从而完善了其全新世喷发历史。U - 1火山喷发的年代为3354 - 3080 calyr BP(95.4%)，其玻璃成分与其他郁陵岛火山不同。
Active volcanoes in East Asia pose potential threats to the surrounding areas. The eruptive history of many of the Japanese volcanoes are well understood, but their dispersal pathways are often based on visible tephra. Additionally, other important volcanoes in the region still require a deeper understanding of their eruptive potential. Here, we explore the Holocene cryptotephra record preserved in a marine core 13PT‐P4 in the southwestern East Sea, in order to better reconstruct past eruptive events and their dispersal. Six widespread tephra layers are identified and correlated to their source volcanoes in S Korea (Ulleungdo), China/N Korea (Changbaishan) and Japan (Kikai), with their dispersal ranges updated. Our results rank the 13PT‐P4 sequence the most intensively tephra‐constrained Holocene record in the East Sea, which permits synchronization of this mid‐latitude archive with records in the Arctic and tropical regions. Terrestrially based tephra ages are used to constrain the marine reservoir effect and the age‐depth model of the record. The average reservoir age in the region is estimated to be 1150 ± 30 14C yr at ca. 7.3–5.6 cal ka BP and 1565 ± 30 14C yr at ca. 1.0 cal ka BP. These observed changes in reservoir age could indicate active upwelling at a regional scale. Additionally, we provide a detailed age estimate and glass geochemistry for a previously poorly understood eruption (U‐1) from the Ulleungdo volcano, thus refining its Holocene eruptive history. The U‐1 eruption is dated to 3354‐3080 cal yr BP (95.4%), and has glass composition that is distinct from other Ulleungdo tephras.