Results 31 to 40 of about 2,249 (210)
Frontiers in Earth Science, 2018 Textural and chemical differences in coeval rhyolitic effusive and explosive eruptions are commonly observed, and numerical models predict different timescales for the eruption of crystal-rich mushes versus crystal-poor magmas. We compare quartz zonation
Susanne Seitz +6 more
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Geological Magazine, 1967 With reference to recognition by P. C. Aw of the Temangan dike as an ignimbrite (see this Bibliography Vol. 31, No. 8, 10 E67-07201), it is pointed out that rocks mapped as quartz porphyry in other Malayan localities are probably also ignimbrites. The fissure in which the Temangan dike is located is considered part of a major structural element which ...
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Correlation of ignimbrites using characteristic remanent magnetization and anisotropy of magnetic susceptibility, Central Andes, Bolivia [PDF]
, 2013 Large ignimbrite flare-ups provide records of profound crustal modification during batholith formation at depth. The locations of source calderas and volumes and ages of the eruptions must be determined to develop models for the tectonomagmatic processes
Ort, Michael H. +4 more
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VolcanicaPyroclastic density currents are complex mixtures of rock, ash and gas and represent significant hazards at many active volcanoes worldwide. Ignimbrites are the deposits of pyroclastic density currents and can be used to record the eruption dynamics and ...
David Brown +3 more
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Permafrost and Periglacial Processes, EarlyView.ABSTRACT The existence of permafrost was explored at tropical latitude on Nevado Coropuna (southern Peruvian Andes) using a combination of ground‐penetrating radar (GPR) and vertical electrical sounding (VES) in order to strengthen the mutual validation of data processing and interpretation.
Velnia Chacca +6 more
wiley +1 more source
VolcanicaThe nature of rifting episodes and their associated volcanism mark key stratigraphic events in the evolution of volcano-sedimentary basins. Following the final assemblage of Pangea, the European region was subject to rifting and magmatism during crustal ...
Jack Whattam +4 more
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Caldera collapse and tectonics along the Main Ethiopian Rift: reviewing possible relationships
Comptes Rendus. Géoscience, 2021 The Main Ethiopian Rift (MER) represents an area where volcanism and tectonics interact to create closely linked volcano-tectonic features. This linkage is paramount in the axial portion of the rift, where magmatic segments localize several large ...
Maestrelli, Daniele +4 more
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Geostandards and Geoanalytical Research, EarlyView.Key Points 7 μm spot‐diameter LA‐MC‐ICP‐MS analyses yield accurate zircon U‐Pb ages. 1013 Ω amplifier resistors improve low‐signal Pb measurements. Saturn correction protocols minimise down‐hole fractionation effects. We present a systematic evaluation of high spatial‐resolution zircon U‐Pb dating using a Thermo Scientific Neoma multi‐collector ICP‐MS ...
Cristiano Lana, John D. Clemens
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Nature, 1961 A FIELD and laboratory study of the Ordovician ignimbrites of North Wales that has been in progress since 19531–3 has revealed certain limitations in Marshall's original hypothesis4 regarding the origin of this interesting category of rocks. These limitations have been apparent to workers elsewhere5–8.
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Petrology of Badenian ignimbrites, Gutai Mts. (Eastern Carpathians)
, 2012 Gutâi Mts., part of inner Carpathians volcanic arc, consist of products of felsic and intermediate volcanism. The previously known “Badenian Rhyodacitic Formation”, expression of the felsic explosive volcanism, is composed of a well-defined basal unit of
Fülöp, Alexandrina, Kovacs, Marinel
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