Stratovolcano - an overview | ScienceDirect Topics
1980年5月18日 · This stratovolcano is located on the North American continental plate above the subducting Juan de Fuca oceanic plate. A magnitude 5.1 earthquake on May 18, 1980, triggered a massive landslide (∼ 3 km 3 of debris) on the north flank leading to a sudden surge of magma, reducing the elevation of the mountain summit by ∼ 400 m to form a 1.6-km ...
Effusive and explosive eruptive history of the Ilopango caldera …
2022年1月1日 · Here we present 28 new 40 Ar/ 39 Ar ages and geochemical data from domes, lavas, dikes, and ignimbrites from the Ilopango caldera and the Antiguo Ilopango stratovolcano as well as from adjacent volcanic systems. Collectively, these new data are used to construct a revised eruptive sequence for the Ilopango caldera that spans almost three ...
The regular shape of stratovolcanoes: A DEM-based …
2010年6月20日 · To carry out a worldwide survey of stratovolcano morphologies we need a global elevation dataset which adequately represents the form of volcanoes. At the beginning of this century a quasi-global elevation dataset from the Shuttle Radar Topographic Mission (SRTM) was released ( Rabus et al., 2003 , Berry et al., 2007 , Farr et al., 2007 ).
Petroleum systems in a buried stratovolcano: Maturation, …
2022年7月1日 · In this study we examine how the emplacement and burial of a stratovolcano can impact the maturation, migration, entrapment and leakage of petroleum in sedimentary basins. We analyse the petroleum system associated with the buried Kora volcano in northern Taranaki Basin offshore northwestern New Zealand ( Fig. 1 ) using 2D basin modelling.
Magnetotelluric imaging of the shallow-seated magma reservoir …
2022年7月1日 · The Karadağ stratovolcano is a 2288 m high intra-plate volcanic structure located in the Konya-Niğde graben in the Anatolian platelet. It covers an area of 600 km 2 . It developed at four phreatic eruption stages separated by the intervening short-term stratigraphical gaps indicated by the formation of intervening soil horizons ( Koç, 1990 ...
Geochemistry of basalts from small eruptive centers near Villarrica ...
2016年7月15日 · Villarrica stratovolcano basalts (<53% SiO 2) have a larger proportion of phenocrysts (up to 20% of sample volume) than most of the SEC basalts (Caburgua, Cerro Redondo, Huelemolle, La Barda), which contain less than 6% phenocrysts. Except for SEC San Jorge, SEC samples are composed of a fine-grained plagioclase-rich intersertal groundmass.
Chalcophile element processing beneath a continental arc …
2019年9月15日 · Supplementary data for Cox et al.; Chalcophile element processing beneath a continental arc stratovolcano. Presented in this appendix are bivariate plots of major and chalcophile element contents versus MgO (Figs. C1–C4) and the results of modelling the effect of sulfide fractionation on Ag contents (Fig. C5).
The global chemical systematics of arc front stratovolcanoes ...
2015年7月15日 · A newly developed tool for compiling and screening data from the GEOROC database was used to generate a global dataset of whole rock chemical analyses from arc front stratovolcano samples. Data from 227 volcanoes within 31 volcanic arc segments were first averaged by volcano and then by arc to explore global systematics.
Classification of ignimbrites and their eruptions - ScienceDirect
2021年9月1日 · In this paper we propose an approach to classify ignimbrites, as we believe that the lack of a structured classification scheme has largely limited the development and the rigorous application of important descriptors of ignimbrites, such as their thickness decay patterns, areal extent and volume, in the way that the scientific community does for fallout deposits, starting …
Volcanostratigraphy and petrogenesis of the Nemrut …
2006年2月28日 · The Nemrut stratovolcano is the most interesting volcanic center in the region with its large collapse caldera and last known lava eruptions at 1441 A.D. (Oswalt, 1912). The volcano is located on the western shore of the Lake Van, the largest soda lake in the world, covering a surface area of 3573 km 2 .