Results 31 to 40 of about 3,716 (202)

Digital geologic map, petrography and U-Pb geochronology of the Río Santiago Shear Zone, southernmost Sierra Madre Occidental, western Mexico

Terra Digitalis, 2022
The boundary between the Sierra Madre Occidental (SMO) and the Trans-Mexican Volcanic Belt (TMVB) is well exposed along the Santiago River, on the border of the states of Nayarit and Jalisco.
Juan Carlos Castillo Reynoso, Luca Ferrari, Argelia Silva Fragoso, Isidro Loza Aguirre   +3 more
doaj   +1 more source

"Hot and sticky" and "cold and damp" pyroclastic eruptions, and their relationship with topography: valley- and lake-filling ignimbrites, Ardnamurchan, NW Scotland

Volcanica
Pyroclastic 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, Ailsa Quirie, Peter Reynolds, Simon Drake   +3 more
doaj   +1 more source

Ignimbrites of the Roque Nublo group, Gran Canaria, Canary Islands

, 1997
Non-welded, lithic-rich ignimbrites, hereintermed the Roque Nublo ignimbrites, are the most distinctive deposits of the Pliocene Roque Nublo group, which forms the products of second magmatic cycle on Gran Canaria. They are very heterogeneous, with 35–55%
Mangas, J., Day, S., Marti, J., Pérez-Torrado, F. J.   +3 more
core   +1 more source

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., De Silva, Shanaka L., Jicha, Brian R., Jimenez C., Nestor, Singer, Bradley S.   +4 more
core   +1 more source

Biotite chemistry fingerprinting for Cenozoic ignimbrites and distal ash-fall correlation, southern Central Andean Volcanic Zone

Volcanica
Explosive eruptions can disperse ash over hundreds of kilometers, but correlating proximal ignimbrites with distal ash-fall deposits remains challenging when units have similar ages and field characteristics. We studied twelve ignimbrites in the southern
Francisco Hevia-Cruz, José Antonio Naranjo, Yuji Orihashi   +2 more
doaj   +1 more source

Capillary water absorption characteristics of some Cappadocian ignimbrites and the role of capillarity on their deterioration

, 2019
Cappadocia stands out as one of the most important regions in Turkey for its natural, historical, and cultural heritages. The region is under the influence of wetting and drying and freezing and thawing weathering processes, which are largely ...
Dinçer, İsmail, Bostancı, Meliha
core   +1 more source

Petrogenesis and Tectonic Setting of Late Mesozoic Felsic Magmatic Rocks in the Wangmushan Mining District, Northern Fujian, South China

Geological Journal, EarlyView.
The rhyolitic ignimbrite and K‐feldspar granite porphyry from the Wangmushan mining district, northern Fujian yield ages of 173.8 ± 0.8 and 102.6 ± 0.4 Ma, respectively. Geochemical data, zircon trace elements, whole‐rock Sr–Nd–Pb isotope data, and zircon Hf isotopic compositions indicate that the rhyolitic ignimbrite originated from partial remelting ...
Wei Shaogang, Hong Wentao, Xiao Fan, Jin Guodong, Shi Hongyang, Ma Zhiwang, Wu Chen, Xue Yujingyang   +7 more
wiley   +1 more source

Late Miocene ignimbrites at the southern Puna-northern Sierras Pampeanas border (~27°S): Stratigraphic correlation [PDF]

, 2015
New field observations and petrographic and geochemical data of pyroclastic deposits exposed along the Las Papas valley (border between southern Puna and northern Sierras Pampeanas, Argentina) and further north, lead us to propose a new stratigraphic ...
Barrios, Fabiola, Guzman, Silvina Raquel, Montero Lopez, Maria Carolina   +2 more
core   +1 more source

Farmers' Soil–Water Management Practices and Perspectives on Soil Salinization in Mirab Abaya District, Gamo Zone, Southern Ethiopia

Irrigation and Drainage, EarlyView.
ABSTRACT Soil salinization is a critical threat, impacting 20% of the world's irrigated lands and jeopardizing food security. In Ethiopia's Mirab Abaya district of the Gamo Zone, unsustainable irrigation methods exacerbate this issue. This paper examines local farmers' soil–water management systems and their awareness of salinization, aiming to educate
Oloba Jobe, Fanuel Laekemariam, Dereje Tsegaye, Demelash Wendemeneh   +3 more
wiley   +1 more source

episodic onset of explosive and silicic-dominated volcanism in a continental rift; insights from the Permian Oslo Rift, Norway

Volcanica
The 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, Ivar Midtkandal, Dougal Jerram, Sara Callegaro, Henrik Svensen   +4 more
doaj   +1 more source