2020-2021年克柳切夫斯科伊火山顶、侧翼喷发条件与岩浆来源:同位素(Sr-Nd-Pb-O)-地球化学数据

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
R. I. Cherkashin, O. V. Bergal-Kuvikas, A. V. Chugaev, Yu. O. Larionova, I. N. Bindeman, A. L. Khomchanovsky, E. Yu. Plutakhina
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A comparative petrographic analysis was carried out and the chemical composition of the <i>Ol</i>, <i>Cpx</i>, and <i>Pl</i> phenocrysts in these lavas was analyzed. The lavas of both eruptions are alumina andesitic basalts of normal alkalinity. Variations of major oxides in the lavas of the summit eruption and G.S. Gorshkov vent are SiO<sub>2</sub> 53.1–53.2 wt % and 51.6–53.2 wt %, MgO 5.6 wt % and 5.5–6.0 wt %; respectively. Temperature and pressure estimates showed that plagioclase crystallization occurred at 1210–1118°С and 12.3–3.6 kbar in lavas of the summit eruption and at 1203–1119°С and 9.0–3.3 kbar in lavas of the flank vent. The contents of major elements, similar conditions of plagioclase generations and compositional variations of <i>Ol</i>, <i>Cpx</i>, and <i>Pl</i> phenocrysts in the lavas of both eruptions indicate a genetic relationship of the magmas that fed the summit and flank eruptions. 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引用次数: 1

摘要

2021年,克柳切夫斯科伊火山(堪察加半岛)发生了一次独特的事件。经过30多年的峰顶喷发,形成了一个侧面喷口。它是以苏联科学院通讯委员G.S.戈尔什科夫的名字命名的。此次火山喷发是在2020-2021年山顶火山口活动结束后立即开始的,喷发地点位于火山西北部海拔2850米的地方,此前没有观测到侧火山作用的表现。本文介绍了2020-2021年克柳切夫斯科伊火山峰顶和侧翼喷发熔岩的地球化学和同位素Sr-Nd-Pb-O数据。进行了对比岩相分析,分析了这些熔岩中Ol、Cpx和Pl斑晶的化学组成。两次喷发的熔岩均为碱性正常的氧化铝安山岩玄武岩。峰顶喷发和G.S. Gorshkov火山口熔岩中主要氧化物的变化为SiO2 53.1 ~ 53.2%和51.6 ~ 53.2%,MgO 5.6%和5.5 ~ 6.0 wt %;分别。温度和压力估算表明,斜长石结晶发生在峰顶喷发熔岩1210 ~ 1118°С和12.3 ~ 3.6 kbar,侧翼喷口熔岩1203 ~ 1119°С和9.0 ~ 3.3 kbar。两次火山喷发熔岩中主要元素含量、斜长石生成条件的相似性以及Ol、Cpx和Pl斑晶的组成变化表明,两次火山喷发岩浆的成因关系与顶、侧喷发岩浆有关。2016年和2020-2021年克柳切夫斯科伊火山顶喷发熔岩,以及之前几次克柳切夫斯科伊火山顶喷发熔岩具有持续的Sr-Nd-Pb同位素特征:87Sr/86Sr = 0.703625-0.703626, 143Nd/144Nd = 0.513085-0.513102, 206Pb/204Pb = 18.3148-18.3179。最后一次峰顶和侧面喷发熔岩的207Pb/204Pb(15.5022 ~ 15.5107)和208Pb/204Pb(37.9597 ~ 38.0143)同位素比值明显高于以往喷发的所有克柳切夫斯科伊熔岩,表明地壳水平岩浆演化更为复杂。火山喷发熔岩的δ18O值为6.49 ~ 7.39‰(SMOW),与克柳切夫斯科伊火山资料一致。与上次高峰喷发熔岩相比,高什科夫火山喷发熔岩在MgO值不变的情况下富含Ba、Zr、Sr等不相容元素,表明其岩浆演化路径不同。G.S. Gorshkov火山口熔岩87Sr/86Sr比值(0.703673 ~ 0.703743)的急剧升高,是克柳切夫斯科伊火山熔岩中未曾观测到的,说明火山西北部初始熔体的地壳同化作用强烈。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Conditions and Magmas Sources of the Summit and Flank Eruptions of Klyuchevskoy Volcano in 2020–2021: Isotope (Sr–Nd–Pb–O)-geochemical data

Conditions and Magmas Sources of the Summit and Flank Eruptions of Klyuchevskoy Volcano in 2020–2021: Isotope (Sr–Nd–Pb–O)-geochemical data

In 2021, a unique event occurred on Klyuchevskoy volcano (Kamchatka). After over 30-year prevalence of summit eruptions, a flank vent was formed. It was named after the Corresponding Member of the USSR Academy of Sciences G.S. Gorshkov. The eruption began immediately after the end of the summit crater activation in 2020–2021 at an altitude of 2850 m in the northwestern part of the volcano, where manifestations of flank volcanism were not observed earlier. This paper presents geochemical and isotopic Sr–Nd–Pb–O data on lavas of the summit and flank eruptions of Klyuchevskoy volcano in 2020–2021. A comparative petrographic analysis was carried out and the chemical composition of the Ol, Cpx, and Pl phenocrysts in these lavas was analyzed. The lavas of both eruptions are alumina andesitic basalts of normal alkalinity. Variations of major oxides in the lavas of the summit eruption and G.S. Gorshkov vent are SiO2 53.1–53.2 wt % and 51.6–53.2 wt %, MgO 5.6 wt % and 5.5–6.0 wt %; respectively. Temperature and pressure estimates showed that plagioclase crystallization occurred at 1210–1118°С and 12.3–3.6 kbar in lavas of the summit eruption and at 1203–1119°С and 9.0–3.3 kbar in lavas of the flank vent. The contents of major elements, similar conditions of plagioclase generations and compositional variations of Ol, Cpx, and Pl phenocrysts in the lavas of both eruptions indicate a genetic relationship of the magmas that fed the summit and flank eruptions. The lavas of the 2016 and 2020–2021 summit eruptions, as well as the lavas of the previous summit eruptions of Klyuchevskoy volcano are characterized by the persistent Sr–Nd–Pb isotopic characteristics: 87Sr/86Sr = 0.703625–0.703626, 143Nd/144Nd = 0.513085–0.513102, 206Pb/204Pb = 18.3148–18.3179. Isotopic ratios 207Pb/204Pb (15.5022–15.5107) and 208Pb/204Pb (37.9597–38.0143) are significantly higher for the lavas of the last summit and flank eruptions than for all Klyuchevskoy lavas of the past eruptions, which indicates more complex magma evolution at crustal levels. The values of δ18O = 6.49–7.39‰ (SMOW)-in the lavas of the considered eruptions are consistent with previously published data on Klyuchevskoy volcano. The lavas of the Gorshkov vent are enriched with Ba, Zr, Sr and other incompatible elements at constant MgO values in comparison with the lavas of the last summit eruptions, which points to the different evolutionary paths of their magmas. Sharply increased values of the 87Sr/86Sr ratio (0.703673–0.703743) in the lavas of the G.S. Gorshkov vent, which were not previously observed in the lavas of Klyuchevskoy volcano, testify to the intense crustal assimilation of initial melts in the northwestern part of the volcano.

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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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