Information om | Engelska ordet IGNIMBRITES

Exempel på hur man kan använda IGNIMBRITES i en mening

• The Kohor pumices and two sets of ignimbrites cover the flanks of Emi Koussi, which steepen as they approach the summit.
• The eastern Snake River Plain is almost entirely underlain by basalt erupted from large shield volcanos on top of rhyolitic ash-flow tuff and ignimbrites.
• This is a system of large calderas and associated ignimbrites, which have been the sources of supereruptions between 10 and 1 million years ago.
• The western plain began to form around 11–12 Ma (million years ago) with the eruption of rhyolite lavas and ignimbrites.
• Crisci G, de Fino M, La Volpe L & Rapisardi L (1983) Pleistocene ignimbrites of Monte Vulture (Basilicata, Southern Italy).
• The terrain of Mount Hasan is formed by phreatomagmatic breccias, ignimbrites, lahar deposits, lava domes, lava flows and pyroclastic flow deposits.
• massive amygdaloidal lavas lacking pillow structures, presence of high-temperature, subaerial ignimbrites, and palaeosols found within it.
• Volcanic centres include calderas and associated large ignimbrites, lava domes and stratovolcanoes; among the better-researched volcanoes are Galan, Nevados de Payachata, Ollague, Purico Complex, San Pedro–San Pablo, La Pacana, Tata Sabaya and Tumisa.
• Each ignimbrite has usually a uniform composition but there is some variation between individual ignimbrites; for example older rocks contain amphibole and younger rocks instead sanidine.
• Generally, formations with good hydrodynamic properties include areas with lava flows, basaltic pyroclasts and/or pumice, while solidified ignimbrites, conditioned by high temperatures and paleosols, such as ash, have produced impermeable conditions.
• The first phase of activity involved the formation of calderas and stratovolcanoes; later during the ice ages lava flows and ignimbrites were emplaced.
• The Aucanquilcha complex is much smaller volumetrically than the APVC ignimbrites, but the duration of activity and the location indicate that Aucanquilcha is a subcomponent of the APVC complex.
• Extrusive products include rhyolitic ignimbrites along with basalt, andesite, and rhyolite lava flows.
• In Etendeka, the quartz latite units are interpreted to be rheomorphic ignimbrites, which are emplaced by explosive eruptions of high-temperature ash-flows.
• Pyroclastic material, given sufficient time to consolidate or 'weld' into hard rock, produce assemblages variously classified as ignimbrites, variously brecciated or agglomerated, along with various types of tuffs and volcanic ash, and are mostly of felsic composition.
• The special, conical rocks and rock groups of the Bükkalja had been prepared from the ground surface composed of mostly ash-flow tuffs and ignimbrites with rhyolitic ingredients, by the key factors of landscape formation in the ice-age, namely: downcutting and lateral erosion, attrition, weathering, rinsing effects of wind and precipitation, and frost erosion.
• Columnar jointing can occur in cooling lava flows and ashflow tuffs (ignimbrites), as well as in some shallow intrusions.
• These cliffs expose hundreds of feet of Miocene and Oligocene lava flows and ignimbrites, which include Steens basalt and various andesite, trachyandesite, and tuff flows.
• The mountain is built of basaltic and hawaiitic lavas, succeeded by trachytes, and then by large volumes of trachytic and rhyolitic ignimbrites with a thickness of up to 1,000 m.
• Volcanism in the backarc of the Central Andes is represented by several types of volcanoes, including several monogenetic volcanoes, stratovolcanoes such as Cerro Tuzgle, Tunupa and Uturunku and large ignimbrites like Altiplano-Puna volcanic complex, Galán, Los Frailes volcanic field and Morococala.

Förberedelsen av sidan tog: 590,65 ms.