Mid-Miocene explosive super-eruptions from the Yellowstone hotspot track: the rhyolitic ignimbrite record in south central Snake River Plain, Idaho, USA

consist of the annual reportof operations, geological and economic maps illustrating the resources and classification of the lands, and reports upon general and economic geology and paleontology.

Effusive eruption

Lava field

Dense-rock equivalent

Volcanology

Vulcanian eruption

10.3133/b79

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Citations (12)

Preliminary Note on Volcanic Eruptions in the Goropu Mountains, Southeastern Papua, during the Period December, 1943, to August, 1944

The Journal of Geology (1946)

George Baker

The phenomena and effects of new volcanic vents of the explosive type in the Goropu Mountains, Owen Stanley Ranges, Papua, are described on a basis of reports made by local observers. Petrological examination of lapilli from the vents indicates that an andesitic volcano has broken through ultrabasic rocks forming part of the Owen Stanley Ranges.

Lapilli

Ultramafic rock

10.1086/625315

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Citations (25)

SANTA BARBARA BASIN SEDIMENT RECORD OF VOLCANIC WINTERS TRIGGERED BY TWO YELLOWSTONE SUPERVOLCANO ERUPTIONS AT 639 KA

Abstracts with programs - Geological Society of America (2017)

James P. Kennett Richard J. Behl Walter E. Dean Christopher C. Sorlien Craig Nicholson

Volcanology

10.1130/abs/2017am-306169

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Late Pleistocene rhyolitic explosive volcanism at Los Azufres Volcanic Field, central Mexico

Geological Society of America eBooks (2012)

José Luis Arce José Luis Macías E. Rangel Paul W. Layer Víctor Hugo Garduño‐Monroy

Abstract Los Azufres Volcanic Field hosts the second most important geothermal field of Mexico, with a production of 188 MW of electricity. Based on fieldwork and new geochronological data (14C and 40Ar/39Ar) we define that activity at Los Azufres Volcanic Field started some 1.5 Ma with the emission of basaltic to rhyolitic lavas, and pyroclastic material. The late Pleistocene explosive activity in the southwest sector (Guangoche volcano area) of Los Azufres occurred in a narrow period of time between >31 and <26 ka. The pyroclastic stratigraphy of the S, SW, and W sectors is represented by diverse deposits of dacitic and rhyolitic composition, including a debris avalanche deposit related to a sector collapse of San Andrés volcano, several pyroclastic sequences associated with plateau forming lavas, and Guangoche volcano. Guangoche volcano was the focus of late Pleistocene eruptive activity with two Plin-ian and one subplinian events that deposited pumice-rich falls and pyroclastic flows and surges. These deposits are informally named the White Pumice (29 ka), which originated from a 23-km-high eruptive column and the ejection of 1.7 km3 of tephra that covered an area of at least 223 km2 with a mass discharge rate of 9 × 107 kg/s; the Ochre Pumice fall (<26 ka), deposited from a 16-km-high eruptive column involving 1.3 km3 of tephra at a mass discharge rate of 1.9 × 107 kg/s; and the Multilayered fallout (<<26 ka) that resulted from an 11-km-high eruptive column with 1 km3 of tephra at a mass discharge rate of 4.6 × 106 kg/s. The complete late Pleistocene stratigraphy suggests that explosive events at Los Azufres Volcanic Field have been intense. They are the subject of ongoing investigations to better understand this kind of large magnitude eruptions.

10.1130/2012.0025(04)

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Citations (16)

Intravent peperites in an eroded phreatomagmatic volcano of the Western Snake River Plain Volcanic Field Idaho (USA) and their implication for field-wide eruptive environment reconstruction

Károly Németh Craig White

Phreatomagmatic eruption

Source

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Emplacement of Holocene silicic lava flows and domes at Newberry, South Sister, and Medicine Lake volcanoes, California and Oregon

Scientific investigations report (2017)

Jonathan Fink Steven W. Anderson

First posted July 19, 2017 For additional information, contact: Volcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 This field guide for the International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI) Scientific Assembly 2017 focuses on Holocene glassy silicic lava flows and domes on three volcanoes in the Cascade Range in Oregon and California: Newberry, South Sister, and Medicine Lake volcanoes. Although obsidian-rich lava flows have been of interest to geologists, archaeologists, pumice miners, and rock hounds for more than a century, many of their emplacement characteristics had not been scientifically observed until two very recent eruptions in Chile. Even with the new observations, several eruptive processes discussed in this field trip guide can only be inferred from their final products. This makes for lively debates at outcrops, just as there have been in the literature for the past 30 years.Of the three volcanoes discussed in this field guide, one (South Sister) lies along the main axis defined by major peaks of the Cascade Range, whereas the other two lie in extensional tectonic settings east of the axis. These two tectonic environments influence volcano morphology and the magmatic and volcanic processes that form silicic lava flows and domes. The geomorphic and textural features of glass-rich extrusions provide many clues about their emplacement and the magma bodies that fed them.The scope of this field guide does not include a full geologic history or comprehensive explanation of hazards associated with a particular volcano or volcanic field. The geochemistry, petrology, tectonics, and eruption history of Newberry, South Sister, and Medicine Lake volcanic centers have been extensively studied and are discussed on other field excursions. Instead, we seek to explore the structural, textural, and geochemical evolution of well-preserved individual lava flows—the goal is to understand the geologic processes, rather than the development, of a specific volcano.

Silicic

Volcanology

Shield volcano

Stratovolcano

10.3133/sir20175022i

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Citations (12)

RECONSTRUCTING THE SUBAQUEOUS PHREATOMAGMATIC ERUPTION AT THE 71 GULCH VOLCANO, WESTERN SNAKE RIVER PLAIN, IDAHO

Abstracts with programs - Geological Society of America (2018)

Kadie Bennis Alison Graettinger

Phreatomagmatic eruption

Phreatic eruption