Patagonian Cenozoic Magmatic Activity

2018 ◽  
pp. 31-67 ◽  
Author(s):  
Emilia Aguilera ◽  
Elizabeth Mazzoni ◽  
Jorge Rabassa
Keyword(s):  
Magmatic Activity

INFLUENCE OF PULSED MAGMATIC ACTIVITY, LATENT HEAT, AND PARTIAL MELTING ON THE STRENGTH OF THE CONTINENTAL CRUST

2020 ◽  
Author(s):  
Aleksi Rantanen ◽  
◽  
David Whipp ◽  
Jussi S. Heinonen ◽  
Lars Kaislaniemi ◽  
...  
Keyword(s):  
Partial Melting ◽  
Continental Crust ◽  
Latent Heat ◽  
Magmatic Activity

scholarly journals Evidence of active magmatic rifting at the Ma’Alalta volcanic field (Afar, Ethiopia)

2021 ◽  
Vol 83 (6) ◽  
Author(s):  
Gianmaria Tortelli ◽  
Anna Gioncada ◽  
Carolina Pagli ◽  
Mauro Rosi ◽  
Laura De Dosso ◽  
...  
Keyword(s):  
Seismic Data ◽  
Volcanic Field ◽  
Lava Flows ◽  
Magmatic Activity ◽  
Magma Storage ◽  
Plumbing System ◽  
Mafic Lava ◽  
Cinder Cones ◽  
Mafic Rocks ◽  
Seismic Networks

AbstractDuring continental rifting, strain and magmatism are believed to localize to narrow magmatic segments, while the rift margin is progressively abandoned. We integrate volcanological, geochemical, petrological and seismic data from the Ma’Alalta volcanic field (MVF) near the western margin of Afar, to show that the MVF is an active magmatic segment. Magmatism in MVF initiated with lava flows and large-volume, caldera-forming ignimbrites from a central edifice. However, the most recent magmatic activity shifted towards mafic lava fields, cinder cones and obsidian-rich silicic domes erupted from vents aligned NNW-SSE, defining a ~ 35-km-long magmatic segment. Along the same area, a NNW-SSE alignment of earthquakes was recorded by two local seismic networks (2005–2009 and 2011–2013). The geochemistry of the mafic rocks is similar to those of nearby axial volcanoes. Inferred magma storage depth from mineral geobarometry shows that a shallow, silicic chamber existed at ~ 5-km depth below the stratovolcano, while a stacked plumbing system with at least three magma storage levels between 9 and 24 km depth fed the recent basalts. We interpret the wide set of observations from the MVF as evidence that the area is an active magmatic segment, showing that localised axial extension can be heavily offset towards the rift margin.

The causes of continental arc flare ups and drivers of episodic magmatic activity in Cordilleran orogenic systems

Lithos ◽  
2021 ◽  
pp. 106307
Author(s):  
James B. Chapman ◽  
Jessie E. Shields ◽  
Mihai N. Ducea ◽  
Scott R. Paterson ◽  
Snir Attia ◽  
...  
Keyword(s):  
Magmatic Activity ◽  
Continental Arc

Magmatic activity during the breakup of Greenland-Eurasia and fluid-flow in Stappen High, SW Barents Sea

2016 ◽  
Vol 76 ◽  
pp. 397-411 ◽  
Author(s):  
K.O. Omosanya ◽  
S.E. Johansen ◽  
P. Abrahamson
Keyword(s):  
Fluid Flow ◽  
Barents Sea ◽  
Magmatic Activity

Potassium–Argon Ages of Igneous Rocks from the Area near Hedley, Southern British Columbia

1972 ◽  
Vol 9 (12) ◽  
pp. 1632-1639 ◽  
Author(s):  
J. C. Roddick ◽  
E. Farrar ◽  
E. L. Procyshyn
Keyword(s):  
British Columbia ◽  
Igneous Rocks ◽  
Magmatic Activity ◽  
Radiometric Ages

K–Ar ages are reported for 19 samples collected from the Hedley, Okanagan, and Similkameen Complexes located in the vicinity of Hedley, British Columbia. Although the zoned nature of amphiboles collected from the Hedley Complex makes interpretation of their radiometric ages difficult, it is suggested that the Hedley Complex was intruded at least 165 m.y. ago and was a part of the same magmatic activity that gave rise to both the Okanagan and Similkameen batholithic complexes. These latter complexes yield ages ranging from 141 m.y. to 184 m.y.

Volcano dynamics vs tectonics on Mars: evidence from Pavonis Mons

2021 ◽  
Author(s):  
Riccardo Pozzobon ◽  
Diana Orlandi ◽  
Carolina Pagli ◽  
Francesco Mazzarini
Keyword(s):  
Structural Features ◽  
Magma Source ◽  
Magmatic Activity ◽  
Normal Faulting ◽  
Azimuthal Distribution ◽  
Structural Mapping ◽  
Volcanic Province ◽  
Magmatic Source ◽  
Rocky Planets ◽  
Topographic Distribution

<p>Volcanic activity is widespread within the inner Solar system and it can be commonly observed on rocky planets.<br>In this work, we analyse the structures of Pavonis Mons, which is one of the three large volcanoes in the Tharsis volcanic province of Mars, by performing structural mapping, azimuth, and topographic distribution of linear features on the flanks of Pavonis, such as grabens and pit chains. We tested whether their formation is to be ascribed to the internal volcano dynamics and magmatic activity or the tectonics related to the Tharsis volcanic province activity.<br>Through the length size distribution and fractal clustering analyses of the structural features, we found that large grabens are vertically confined in the upper mechanical layers of the brittle crust whereas pit chains penetrate the whole crust up to the magmatic source, indicating that they can be considered the main feeders of Pavonis Mons. We inverted the topography with dykes and faults models to test whether grabens at the surface are the expression of intrusions at depth and we suggest that thin dykes inducing normal faulting is the most likely mechanism. Furthermore, two azimuthal distribution of the grabens are identified: concentric grabens occur on the volcano summit while linear grabens at its base show NE-SW trend as the Tharsis Montes volcanoes alignment. The analyses show that faults related to large grabens are confined in a mechanical layering in the upper layers of the brittle crust, whereas deeper structures such as pit chains are most likely associated to magma injection/dykes and therefore, connected to the subcrustal magma source at a depth of ~80–100 km.<br>Therefore, based on our results, we infer that Pavonis Mons recorded active rifting at the initial stages of development with the formation of the large linear graben and faults at its base followed by a phase of volcano growth and concentric magma intrusions when volcano and magma chamber dynamics prevailed</p>

Monitoring the magmatic activity and volatile fluxes of an actively degassing submarine caldera in southern Japan

2021 ◽  
Author(s):  
Ma. Teresa Escobar Nakajima ◽  
Naoto Takahata ◽  
Kotaro Shirai ◽  
Takanori Kagoshima ◽  
Kentaro Tanaka ◽  
...  
Keyword(s):  
Magmatic Activity ◽  
Southern Japan
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