Cryptotephra preserved in Lake Suigetsu (SG14 core) reveals the eruption timing and distribution of ash fall from Japanese volcanoes during the late-glacial to early Holocene
Cryptotephra preserved in Lake Suigetsu (SG14 core) reveals the eruption timing and distribution of ash fall from Japanese volcanoes during the late-glacial to early Holocene
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DOI：
10.1016/j.quascirev.2023.108376
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发表时间：
2024-01
影响因子：
4
通讯作者：
P. Albert;D. McLean;Hannah M. Buckland;Takehiko Suzuki;Gwydion Jones;R. Staff;Sophie Vineberg;I. Kitaba;Keitaro Yamada;Hiroshi Moriwaki;Daisuke Ishimura;K. Ikehara;Christina J. Manning;Takeshi Nakagawa;Victoria C. Smith
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作者：
P. Albert;D. McLean;Hannah M. Buckland;Takehiko Suzuki;Gwydion Jones;R. Staff;Sophie Vineberg;I. Kitaba;Keitaro Yamada;Hiroshi Moriwaki;Daisuke Ishimura;K. Ikehara;Christina J. Manning;Takeshi Nakagawa;Victoria C. Smith
为古气候研究提取的长沉积序列通常保存了火山爆发时落下的火山灰，并越来越多地用于阐明过去事件的时间和规模。本研究调查了日本绥越湖（SG14岩心）每年层压和14c测年的沉积物中保存的不可见的tephra（隐tephra）层。本文报道的隐毯层研究集中在晚冰期到全新世早期的沉积物上，这些沉积物沉积在两个可见的隐毯层之间，Ulleungdo (U)-Oki （10.2 ka）和Sambe ' Sakate (19.6 ka)，因此跨越了一个突变气候变化的间隔，使得任何新发现的隐毯层都是宝贵的年代地层标志。利用火山玻璃的主要和微量元素组成，用隐式玻璃来确定与年代地层相关的喷发单元的物源。在这段时间间隔内确定了五个新的隐隐层。三个隐层来自九州火山（SG14-1337和SG14-1554 [Sakurajima]和SG14-1806[雾岛]），所有这些都为日本南部在最后终止期间的考古（绳纹）文化转变提供了重要的时间限制。另一个隐球菌（SG14-1579）被分配到新岛的活动中，提供了第一个已知的远端发生和喷发的年龄。SG14-1798隐层精确年代为16619±74 IntCal20年BP (2σ)，与Asama （As）火山有关，更准确地说，与As- yku火山喷发后期有关。这一发现极大地扩展了浅间火山这次多阶段喷发所产生的火山灰的分布，这次喷发影响了12万平方公里的地区。精确确定喷发的时间和as - yku火山灰的分布是非常重要的，因为它提供了一个很好的时间和气候地层标志，适用于评估末次冰期结束期间过去气候变化对环境响应的空间变异性。
Long sedimentary successions extracted for palaeoclimate research regularly preserve volcanic ash (tephra) fall from explosive eruptions and are increasingly used to elucidate the timing and scale of past events. This study investigates the non-visible tephra (cryptotephra) layers preserved in the annually laminated and intensively14C dated sediments of Lake Suigetsu (SG14 core), Japan. The cryptotephra investigations reported here focus on the Late-glacial to early Holocene sediments that were deposited between two visible tephra layers, the Ulleungdo (U)-Oki (10.2 ka) and the Sambe ‘Sakate’ (19.6 ka), and consequently span an interval of abrupt climate change making any newly identified cryptotephra layers invaluable chrono-stratigraphic markers. Using major and trace element volcanic glass compositions the cryptotephra are used to assign provenance to chrono-stratigraphically relevant eruption units. Five new cryptotephra layers are identified within this time interval. Three cryptotephra layers are from Kyushu volcanoes (SG14-1337 and SG14-1554 [Sakurajima]; and SG14-1806 [Kirishima]), all of which offer important chronological constraints on archaeological (Jomon) cultural transitions in southern Japan during the last termination. Another cryptotephra (SG14-1579), is assigned to activity on Niijima Island providing the first known distal occurrence and age of the eruption. Finally, the SG14-1798 cryptotephra precisely dated at 16,619 ± 74 IntCal20 yrs BP (2σ) is linked to Asama (As) volcano and more precisely the later phases of the As-YKU eruption. This discovery greatly expands the distribution of ash fall from this multi-phased eruption at Asama volcano, which affected an area in the region of 120,000 km2. Refining the timing of the eruption and the distribution of As-YKU ash fall is important as it offers an excellent chrono- and climato-stratigraphic marker suitable for assessing spatial variability in environmental response to past climate change during the termination of the last glacial.