Results 31 to 40 of about 418,217 (192)

The incrementally zoned Miocene Ayagaures ignimbrite (Gran Canaria, Canary Islands) [PDF]

, 2010
The 20–25 m thick trachyphonolitic Ayagaures ignimbrite cooling unit [(AY); 11.8 Ma] exposed over 250 km2 (onshore volume ca. 4.5 km3 DRE) is the uppermost and most voluminous cooling unit of the Middle Fataga Formation (MFF), part of the Fataga Group ...
Hans-Ulrich Schmincke, Schmincke, Hans-Ulrich, Jutzeler, Martin, Martin Jutzeler, Sumita, Mari, Mari Sumita   +5 more
core   +1 more source

Mush microphysics and the reactivation of crystal‐rich magma reservoirs [PDF]

Journal of Geophysical Research: Solid Earth, 2014
AbstractReactivation and eruption of upper crustal crystal‐rich magma reservoirs (“crystal mushes”) following recharge has recently been invoked in numerous volcanic systems worldwide. Over the last few years, several models have been proposed for the reactivation of such mushes prior to or during eruptions.
Parmigiani, Andrea, Huber, Christian, Bachmann, Olivier   +2 more
openaire   +2 more sources

Composition and Petrology of a Mush-Bearing Magma Reservoir beneath Tenerife [PDF]

Journal of Petrology, 2022
Abstract Deciphering the dynamics of sub-volcanic magmatic processes requires a detailed understanding of the compositional and textural relationships between melt and crystals. To examine these relationships, we investigated material from one of the largest caldera-forming explosive eruptions on the ocean island of Tenerife, the 312 ...
Horn, EL, Taylor, RN, Gernon, TM, Stock, MJ, Farley, EMR   +4 more
openaire   +3 more sources

Magma Chamber Detected Beneath an Arc Volcano With Full‐Waveform Inversion of Active‐Source Seismic Data

Geochemistry, Geophysics, Geosystems, 2022
Arc volcanoes are underlain by complex systems of molten‐rock reservoirs ranging from melt‐poor mush zones to melt‐rich magma chambers. Petrological and satellite data indicate that eruptible magma chambers form in the topmost few kilometres of the crust.
K. Chrapkiewicz, M. Paulatto, B. A. Heath, E. E. E. Hooft, P. Nomikou, C. B. Papazachos, F. Schmid, D. R. Toomey, M. R. Warner, J. V. Morgan   +9 more
doaj   +1 more source

Rates of magma transfer in the crust: Insights into magma reservoir recharge and pluton growth [PDF]

Geology, 2015
Plutons have long been viewed as crystallized remnants of large magma reservoirs, a concept now challenged by high-precision geochronological data coupled with thermal models. Similarly, the classical view of silicic eruptions fed by long-lived magma reservoirs that slowly differentiate between mafic recharges is being questioned by petrological and ...
Menand, Thierry, Annen, Catherine, de Saint Blanquat, Michel   +2 more
openaire   +3 more sources

Two Distinct Magma Storage Regions at Ambrym Volcano Detected by Satellite Geodesy

Geophysical Research Letters, 2023
The flux of eruptible magma into a magmatic plumbing system influences eruption size and timing. If magma transfer is possible between two hydraulically‐connected magma lenses, system destabilization can tap a larger magma volume than stored in any one ...
T. Shreve, Y. Zhan, H. Le Mével, D. Roman, Y. Moussallam   +4 more
doaj   +1 more source

On depressurization of volcanic magma reservoirs by passive degassing [PDF]

Journal of Geophysical Research: Solid Earth, 2014
AbstractMany active volcanoes around the world alternate episodes of unrest and mildly explosive eruptions with quiescent periods dominated by abundant but passive gas emissions. These are the so‐called persistently degassing volcanoes, and well‐known examples are Mayon (Philippines) and Etna (Italy).
Newhall, Chris, Taisne, Benoit, Girona, Társilo, Costa, Fidel   +3 more
openaire   +2 more sources

Massive carbon storage in convergent margins initiated by subduction of limestone

Nature Communications, 2021
Experiments and buoyancy calculations reveal that subduction of limestone results in massive carbon storage in arc lithosphere, forming an important carbon reservoir in convergent margins.
Chunfei Chen, Michael W. Förster, Stephen F. Foley, Yongsheng Liu   +3 more
doaj   +1 more source

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Seismic imaging and petrology explain highly explosive eruptions of Merapi Volcano, Indonesia

Scientific Reports, 2018
Our seismic tomographic images characterize, for the first time, spatial and volumetric details of the subvertical magma plumbing system of Merapi Volcano. We present P- and S-wave arrival time data, which were collected in a dense seismic network, known
S. Widiyantoro, M. Ramdhan, J.-P. Métaxian, P. R. Cummins, C. Martel, S. Erdmann, A. D. Nugraha, A. Budi-Santoso, A. Laurin, A. A. Fahmi   +9 more
doaj   +1 more source