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21 Result(s)
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Valentin R. Troll
Mineralogy
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Article
Open AccessWater in clinopyroxene from the 2021 Geldingadalir eruption of the Fagradalsfjall Fires, SW-Iceland
Water content plays a significant role in magma genesis, ascent rate, and, ultimately, in the style and intensity of volcanic eruptions, due to its control on the density, viscosity and melting behaviour of si...
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Book Series
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Book
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Chapter
Merapi: Evolving Knowledge and Future Challenges
Despite the significant progress in our understanding of Merapi and its activity, as demonstrated by the contributions in this book, fundamental scientific questions about the volcano have remained unanswered ...
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Chapter
The Magma Plumbing System of Merapi: The Petrological Perspective
Merapi volcano in Central Java is one of the most active volcanoes in the Sunda arc and poses a continuous threat to the local population. Basaltic-andesites from Merapi carry a voluminous crystal cargo and va...
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Chapter
The Scientific Discovery of Merapi: From Ancient Javanese Sources to the 21st Century
Merapi is Indonesia’s most active volcano and one of the most iconic volcanoes worldwide. Renowned for its almost continuous eruptive activity and its magnificent summit dome as well as the frequent occurrence...
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Chapter
Magma-Carbonate Interaction at Merapi Volcano, Indonesia
Merapi volcano, Indonesia, is a highly active arc volcano built upon a crustal succession that includes thick carbonate sequences. Calc-silicate (skarn) xenoliths are frequently found in Merapi’s erupted produ...
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Article
Whole-rock oxygen isotope ratios as a proxy for the strength and stiffness of hydrothermally altered volcanic rocks
Hydrothermal alteration is considered to increase the likelihood of dome or flank collapse by compromising stability. Understanding how such alteration influences rock properties, and providing independent met...
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Article
Open AccessPetrogenesis of the Loch Bà ring-dyke and Centre 3 granites, Isle of Mull, Scotland
The Loch Bà ring-dyke and the associated Centre 3 granites represent the main events of the final phase of activity at the Palaeogene Mull igneous complex. The Loch Bà ring-dyke is one of the best exposed ring...
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Article
In situ LA–ICP–MS trace element analyses of magnetite: genetic implications for the Zhonggu orefield, Ningwu volcanic basin, Anhui Province, China
The Zhonggu orefield is located within the southern Ningwu volcanic basin and is one of the largest iron ore districts within the Middle–Lower Yangtze River Metallogenic Belt (MLYRMB) of eastern China. The are...
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Article
Amphibole megacrysts as a probe into the deep plumbing system of Merapi volcano, Central Java, Indonesia
Amphibole has been discussed to potentially represent an important phase during early chemical evolution of arc magmas, but is not commonly observed in eruptive arc rocks. Here, we present an in-depth study of...
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Article
The magma plumbing system for the 1971 Teneguía eruption on La Palma, Canary Islands
The 1971 Teneguía eruption is the most recent volcanic event of the Cumbre Vieja rift zone on La Palma. The eruption produced basanite lavas that host xenoliths, which we investigate to provide insight into th...
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Article
Textural history of recent basaltic-andesites and plutonic inclusions from Merapi volcano
Mt. Merapi in Central Java is one of the most active stratovolcanoes on Earth and is underlain by a multistage plumbing system. Crystal size distribution analyses (CSD) were carried out on recent Merapi basalt...
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Article
The structure and morphology of the Basse Terre Island, Lesser Antilles volcanic arc
Basse Terre Island is made up of a cluster of composite volcanoes that are part of the Lesser Antilles volcanic arc. The morphology of these volcanoes and the onshore continuation of the grabens and strike–sli...
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Article
Magma plumbing beneath Anak Krakatau volcano, Indonesia: evidence for multiple magma storage regions
Understanding magma plumbing is essential for predicting the behaviour of explosive volcanoes. We investigate magma plumbing at the highly active Anak Krakatau volcano (Indonesia), situated on the rim of the 1...
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Article
Analogue models of caldera collapse in strike-slip tectonic regimes
Regional-scale faulting, particularly in strike-slip tectonic regimes, is a relatively poorly constrained factor in the formation of caldera volcanoes. To examine interactions between structures associated wit...
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Article
Large-scale failures on domes and stratocones situated on caldera ring faults: sand-box modeling of natural examples from Kamchatka, Russia
Edifices of stratocones and domes are often situated eccentrically above shallow silicic magma reservoirs. Evacuation of such reservoirs forms collapse calderas commonly surrounded by remnants of one or severa...
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Article
Pre-eruptive magma mixing in ash-flow deposits of the Tertiary Rum Igneous Centre, Scotland
The Northern Marginal Zone of the Rum Igneous Centre is a remnant of an early caldera and its infill. It is composed of intra-caldera breccias and various small-volume pyroclastic deposits, overlain by promine...
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Article
The REE-Ti mineral chevkinite in comenditic magmas from Gran Canaria, Spain: a SYXRF-probe study
The REE-Ti silicate chevkinite has been recognised previously in Miocene ignimbrites from Gran Canaria, and in correlative offshore syn-ignimbrite turbidites. We have estimated the partition coefficients of RE...
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Article
Formation of caldera periphery faults: an experimental study
Changing stresses in multi-stage caldera volcanoes were simulated in scaled analogue experiments aiming to reconstruct the mechanism(s) associated with caldera formation and the corresponding zones of structur...
