Four widespread East Asian tephra marker horizons during early MIS 3: ~60–50 ka tephrostratigraphy of Huguangyan Maar Lake southern China
Four widespread East Asian tephra marker horizons during early MIS 3: ~60–50 ka tephrostratigraphy of Huguangyan Maar Lake southern China
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早期MIS 3期间四个广泛分布的东亚火山灰地层：中国南部湖光岩玛珥湖~60-50ka火山地层
DOI：
10.1016/j.quascirev.2022.107389
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发表时间：
2022
影响因子：
4
通讯作者：
Jiaqi Liu
中科院分区：
文献类型：
--
作者：
Chunqing Sun;Gill Plunkett;Luo Wang;Jens Mingram;Jingtai Han;Guoqiang Chu;Jiaqi Liu
火山喷发形成的盖层可以为大区域的古环境研究提供有价值的等时标志层。东亚和东南亚是地球上一半以上空中火山的所在地，这些火山的冰盖提供了大量广泛分布的标志层。然而，由于只建立了有限的(隐蔽的)盖层层序，该地区的完整的盖层格架还不够精细。在这项研究中，我们从中国南部湖光岩玛尔湖的一个湖相沉积物中发现了一个涵盖东亚约60-50ka的隐翅虫序列。发现了4个隐盖岩层，其中一个与日本Sambe火山的~53.8ka Unnan喷发(SUN)有关。这一Tephra为连接日本中部至中国南部的古环境记录提供了一个关键的等时标志层，说明了该地区在MIS3早期的一致环境变迁。其他三个冰盖无法与已知的喷发联系在一起，但玻璃地球化学成分表明，它们可能来自日本或周边地区，这意味着它们也可能广泛分布在东亚各地。重要的是，它们中的两个是信息管理系统3的开始，因此有可能被用来建立东亚地区管理信息系统3开始的同步性，克服目前阻碍该地区早期信息管理系统3年代确定的挑战。
Tephra layers from explosive eruptions can provide valuable isochronous marker horizons for paleoenvironmental studies across large regions. East Asia and Southeast Asia are host to more than half of the Earth’s subaerial volcanoes, and tephras from these volcanoes offer significant numbers of widely distributed marker layers. However, the integrated tephrostratigraphic framework of this region is less refined because only limited (crypto-) tephra sequences have been established. In this study, we present a cryptotephra sequence covering the period ~60–50 ka in East Asia from a lacustrine sediment from Huguangyan Maar Lake, southern China. Four cryptotephra layers were identified, one of which can be correlated with the ~53.8 ka Unnan eruption (SUn) of Sambe volcano, Japan. This tephra provides a critical isochronous marker horizon for linking paleoenvironmental records from central Japan to southern China, illustrating a consistent environmental shift during early MIS 3 across this region. The three other tephras cannot be correlated with known eruptions, but glass geochemical compositions suggest that they may be from Japan or surrounding areas, implying that they too may be widely distributed around East Asia. Importantly, two of them feature at the start of MIS 3, and thus can be potentially be used to establish the synchroneity of the onset of MIS 3 around East Asia, overcoming challenges that presently hinder the dating of early MIS 3 in this region.