Pauzhetka Caldera (South Kamchatka): Еxploring Temporal Evolution and Origin of Voluminous Silicic Magmatism

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2022-09-06 DOI:10.1134/S0869591122050022
V. O. Davydova, I. N. Bindeman, M. D. Shchekleina, S. N. Rychagov
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引用次数: 2

Abstract

The Pauzhetka Caldera (27 × 18 km) was formed in the South Kamchatka during the Golygin Ignimbrite eruption (420–440 ka), the largest known eruption in the region in the past 1 Myr. The eruption was preceded by the 3 Ma-old mafic and intermediate volcanism. After the caldera-forming eruption, a variety of products, from basalt to rhyolite, were ejected within the caldera. For understanding the origin of voluminous silicic magmatism in thin mafic South Kamchatka crust, we used geochemical and isotope data. Our research has characterized the major and trace element composition of Golygin ignimbrite, intra-caldera hydrothermally altered deposits, pre-caldera (Mt. Orlinoe Krylo, Mt. Klyuchevskaya) and post-caldera (Kambalny Ridge, Chernye Skaly) eruptive centers. The Sr–Nd isotope composition of the Golygin ignimbrite and some eruptive post-caldera products was investigated. The isotope variations indicate that parental magmas for all rocks of the Pauzhetka area were obtained from a weakly evolved source derived through fluid-assisted melting of a subducted slab. Geochemical data support that the formation of most magmas of the Pauzhetka caldera was mainly controlled by fractional crystallization in the lower to middle crust. MELTS-modelling agrees with geochemical data. The fractional crystallization of Kambalny basalt with 2 wt % H2O at 6 kbar provides the best fit to the observed composition of the Golygin dacite.

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南堪察加保哲特卡火山口:Еxploring大体积硅质岩浆作用的时间演化与成因
保哲特卡火山口(27 × 18公里)是在南堪察加半岛的Golygin Ignimbrite火山喷发(420-440 ka)期间形成的,这是该地区过去1世纪以来已知的最大火山喷发。喷发前为3 Ma-old的基性和中期火山作用。形成破火山口后,从玄武岩到流纹岩等各种产物在破火山口内喷射出来。为了了解南堪察加薄基性地壳中大量硅质岩浆活动的成因,我们利用地球化学和同位素资料进行了研究。我们研究了Golygin火成岩、破火山口内热液蚀变矿床、破火山口前(Mt. Orlinoe Krylo, Mt. Klyuchevskaya)和破火山口后(Mt. Kambalny Ridge, Chernye Skaly)喷发中心的主量和微量元素组成特征。研究了戈利金火成岩和部分火山口后喷发产物的Sr-Nd同位素组成。同位素变化表明,Pauzhetka地区所有岩石的母岩浆均来自一个弱演化源,该源是由俯冲板块的流体辅助熔融形成的。地球化学资料支持保哲特卡火山口大部分岩浆的形成主要受中下地壳分异结晶控制。melts模型与地球化学数据一致。在6 kbar条件下,用2 wt % H2O对Kambalny玄武岩进行分馏结晶,与观察到的Golygin英安岩组成最吻合。
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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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