Late Pleistocene Mafic Magmatism and Its Relation to Large Caldera-Forming Eruptions on Iturup Island: An Example of Klumba Volcano, Kuril Islands

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
T. Yu. Timina, S. Z. Smirnov, D. V. Kuzmin, A. A. Kotov, A. V. Rybin, V. A. Danilovsky, A. E. Izokh
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Abstract

Klumba basaltic andesite volcano is the only postcaldera volcano in the eruptive center of one of the most powerful explosive eruptions that occurred at the end of the Late Pleistocene in the Great Kuril Arc (GKA) and formed a thick sequence of dacitic pumice tuffs on the Vetrovoy Isthmus on Iturup Island. A detailed study of the mineralogy of the basaltic andesites of Klumba volcano and olivine-hosted fluid and melt inclusions showed that the feeding magma evolved within the arc crust at depths between 15.5 and 7 km and was related to Mg-rich (up to 9.8 wt % MgO), low-K and low-Al basaltic andesite melts that initially contained about 5–6 wt % H2O. Olivine and Cr–Al spinel were the first to crystallize in the magma and later were joined by plagioclase and pyroxenes. The phenocrysts crystallized at temperatures of about ~1000–1200°C. The melt was saturated with CO2 fluid with minor amounts of SO2. Pleistocene basaltic andesitic magmatism in the central part of Iturup Island was predominantly intrusive and resulted in the formation of a large transcrustal magmatic system (TCMS), which could include the dacitic chamber that fed the explosive eruption of the Vetrovoy Isthmus. The plumbing system of Klumba volcano is considered to be a part of this TCMS, which was intermittently recharged by variously differentiated basaltic andesite magmas. It is assumed that such systems may have developed on the scale of the whole island. The duration of the processes and the amount of intruded magma may have been sufficient to cause partial melting in the upper parts of the island-arc crust and to form magma reservoirs of powerful explosive caldera-forming eruptions.

Abstract Image

伊图鲁普岛晚更新世基性岩浆活动及其与大破火山口喷发的关系——以千岛群岛Klumba火山为例
Klumba玄武岩安山岩火山是发生在晚更新世末期大千岛弧(GKA)最强大的爆发之一的喷发中心唯一的火山口后火山,并在Iturup岛的Vetrovoy地峡形成了厚厚的英质浮石凝灰岩序列。对Klumba火山玄武岩安山岩的矿物学和含橄榄石的流体和熔体包裹体的详细研究表明,补给岩浆在弧壳深度15.5 ~ 7 km之间演化,与富镁(高达9.8 wt % MgO)、低钾和低铝玄武岩安山岩熔体有关,最初含有约5 ~ 6 wt % H2O。橄榄石和铬铝尖晶石首先在岩浆中结晶,然后斜长石和辉石加入。在约1000 ~ 1200℃的温度下,该现象结晶。熔体被含有少量SO2的CO2流体饱和。伊图鲁普岛中部的更新世玄武岩安山岩岩浆活动以侵入性岩浆活动为主,形成了一个大型跨地壳岩浆系统(TCMS),其中可能包括为Vetrovoy地峡的爆发提供岩浆的英质岩浆室。Klumba火山的管道系统被认为是这个tms的一部分,它被不同分异的玄武岩安山岩岩浆间歇性地补充。据推测,这样的系统可能已经在整个岛屿的规模上发展起来。这些过程的持续时间和侵入岩浆的数量可能足以导致岛弧地壳上部的部分熔融,并形成强大的爆炸性火山口形成火山喷发的岩浆库。
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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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