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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 ...
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 ...
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 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 ...
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.
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.
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 with Walker's (1973 ...
To address these gaps in knowledge, a comprehensive study was completed of a central intrusive complex near the base of the eroded Summer Coon stratovolcano in Colorado (USA; Fig. 1). I investigated the geometry and distribution of CIC intrusions and their host rock using detailed geologic mapping and a ground-based magnetic survey.
Focusing mainly on their morphology, or that of their associated edifices, calderas on Earth can be classified into three major categories: Basalt shield, stratovolcano, and ash-flow calderas. Basalt shield calderas sit atop large, broad shields, such as Mauna Loa in Hawaii (Fig. 31) or Fernandina in the Galapagos. The summit calderas are ...
Erciyes stratovolcano, culminating at 3917 m, is located in the Cappadocian region of central Anatolia. During its evolution, this Quaternary volcano produced pyroclastic deposits and lava flows. The great majority of these products are calc-alkaline in character and they constitute Kocdag and Erciyes sequences by repeated activities.