Identification and correlation of visible tephras in the Lake Suigetsu SG06 sedimentary archive, Japan: chronostratigraphic markers for synchronising of east Asian/west Pacific palaeoclimatic records across the last 150 ka
Identification and correlation of visible tephras in the Lake Suigetsu SG06 sedimentary archive, Japan: chronostratigraphic markers for synchronising of east Asian/west Pacific palaeoclimatic records across the last 150 ka
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DOI：
10.1016/j.quascirev.2013.01.026
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发表时间：
2013-05
影响因子：
4
通讯作者：
V. Smith;R. Staff;S. Blockley;C. Ramsey;T. Nakagawa;D. Mark;K. Takemura;T. Danhara
中科院分区：
文献类型：
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作者：
V. Smith;R. Staff;S. Blockley;C. Ramsey;T. Nakagawa;D. Mark;K. Takemura;T. Danhara
日本中部本州岛的水月湖SG 06沉积档案提供了高分辨率的古环境记录，包括日本和韩国爆发火山活动的详细记录。在长达73 m的SG 06岩芯中记录了30个可见火山喷发点，其时间跨度为150 ka。本文利用水月湖SG 06记录中陆生植物化石的大量放射性碳测量（n > 600），对水月湖沉积物中的火山碎屑进行了描述和分析，并对它们的年龄模式进行了讨论。我们能够提供最近50 ka内火山喷发的火山岩的精确年龄。本文还介绍了日本一些最大喷发（K-Ah、AT、阿索-4、阿索-A、阿索-D和阿塔;在近端露头处取样）的玻璃成分数据。这些数据表明，主要元素玻璃化学对于许多可见的SG 06火山灰单位是独特的，并且允许一些层与日本和韩国的已知火山喷发相关联，即K-Ah（SG 06 -0967）、U-Oki（SG 06 -1288）、AT（SG 06 -2650）、阿索-4（SG 06 -4963/SG 06 -4979）、K-Tz（SG 06 -5181）、Aso-ABCD（SG 06 -5287）和Ata（SG 06 -5181）。获得了SG 06火山灰装置的以下年龄：3.966-4.064 cal. ka BP（95.4%的概率范围）为SG 06 -0588火山灰，10.242-10.329 cal. ka BP（95.4%概率范围），SG 06 -1965为19.487 ± 112 SG 062012 ka BP（2 σ），SG 06 -2504为28.425 ± 194 SG 062012 ka BP（2 σ），SG 06 -2534为28.848 ± 196 SG 062012 ka BP（2 σ），SG 06 -2601为29.765 ± 190 SG 062012 ka BP（2 σ），SG 06 - 2602为29.775 ± 191 SG 062012 ka BP（2 σ），SG 06 -3485为43.713 ± 156 SG 062012 ka BP（2 σ），SG 06 -3668为46.364 ± 202 SG 062012 ka BP（2 σ），SG 06 -3912为49.974 ± 337 SG 062012 ka BP（2 σ），SG 06 -3974为50.929 ± 378 SG 06 2012 ka BP（2 σ），日本两个最重要的火山灰标志物K-Ah的年龄有所改善（7.165-7.303 cal. ka BP，95.4%概率范围; SG 06 -0967）和AT火山灰（30.009 ± 189 SG 06 - 2012 ka BP，2 σ; SG 06 -2650）。
The Lake Suigetsu SG06 sedimentary archive from Honshu Island, central Japan, provides a high-resolution palaeoenvironmental record, including a detailed record of explosive volcanism from Japan and South Korea. Thirty visible tephra are recorded within the 73 m-long SG06 core, which spans the last ∼150 ka. Here we describe and characterise these tephras based on major element glass composition, which is useful for the identification and correlation of these tephras and the age models of the records in which they are found. Utilising the large number of radiocarbon measurements (n > 600) from terrestrial plant macrofossils in the Lake Suigetsu SG06 record, we are able to provide precise and accurate ages for the tephras from eruptions within the last 50 ka. Glass compositional data of some of the largest eruptions from Japan (K-Ah, AT, Aso-4, Aso-A, Aso-D, and Ata; sampled at proximal outcrops) are also presented. These data show that the major element glass chemistry is distinctive for many of the visible SG06 tephra units, and allows some of the layers to be correlated to known eruptions from volcanoes in Japan and South Korea, namely K-Ah (SG06-0967), U-Oki (SG06-1288), AT (SG06-2650), Aso-4 (SG06-4963/SG06-4979), K-Tz (SG06-5181), Aso-ABCD (SG06-5287) and Ata (SG06-5181). The following ages were obtained for the SG06 tephra units: 3.966–4.064 cal. ka BP (95.4% probability range) for the SG06-0588 tephra, 10.242–10.329 cal. ka BP (95.4% probability range) for SG06-1293, 19.487 ± 112 SG062012ka BP (2 σ) for SG06-1965, 28.425 ± 194 SG062012ka BP (2 σ) for SG06-2504, 28.848 ± 196 SG062012ka BP (2 σ) for SG06-2534, 29.765 ± 190 SG062012ka BP (2 σ) for SG06-2601, 29.775 ± 191 SG062012ka BP (2 σ) for SG06-2602, 43.713 ± 156 SG062012ka BP (2 σ) for SG06-3485, 46.364 ± 202 SG062012ka BP (2 σ) for SG06-3668, 49.974 ± 337 SG062012ka BP (2 σ) for SG06-3912, 50.929 ± 378 SG062012ka BP (2 σ) for SG06-3974, and improved ages for two of the most important tephra markers across Japan, the K-Ah (7.165–7.303 cal. ka BP at 95.4% probability range; SG06-0967) and AT tephra (30.009 ± 189 SG062012ka BP at 2 σ; SG06-2650).