Results 51 to 60 of about 124,258 (296)

El volcanismo jurásico superior de la Formación Río Damas-Tordillo (33°-35,5°S): antecedentes su sobre petrogénesis, cronología, proveniencia e implicancias tectónicas [PDF]

, 2014
Los depósitos continentales y volcánicos de la Formación Rio Damas-Tordillo, Jurásico Superior, representan un período restringido de sedimentación continental dentro del registro mayormente marino de la Cuenca Neuquina.
Calderón, Sergio, Charrier González, Reynaldo, Ducea, Mihai Nicolae, Hoffman, Derek, Mescua, Jose Francisco, Oliveros, Verónica, Rossel, Pablo, Tapia, Felipe   +7 more
core   +2 more sources

Modeling Wavelength Dependent Mid‐Infrared (5.5–25 μm) Optical Constants of Silicate Glasses: A Genetic Algorithm Approach

Earth and Space Science, 2023
Wavelength‐dependent mid‐infrared (400–1,800 cm−1; 5.56–25 μm) optical constants (real and imaginary indices of refraction; n and k) are determined using reflectance spectra at a spectral sampling of 4 cm−1 for several silicate glasses of varying SiO2 wt%
I. Varatharajan, E. Sklute, T. D. Glotch, M. D. Dyar   +3 more
doaj   +1 more source

Intensive Wildfire Associated With Volcanism Promoted the Vegetation Changeover in Southwest China During the Permian−Triassic Transition

Frontiers in Earth Science, 2021
Palaeo-wildfire, which had an important impact on the end Permian terrestrial ecosystems, became more intense in the latest Permian globally, evidenced by extensive occurrence of fossil charcoals.
Yao-feng Cai, Yao-feng Cai, Hua Zhang, Zhuo Feng, Shu-zhong Shen   +4 more
doaj   +1 more source

Chapter 1.4 Antarctic volcanism: active volcanism overview

Geological Society, London, Memoirs, 2021
Abstract In the last two centuries, demographic expansion and extensive urbanization of volcanic areas have increased the exposure of our society to volcanic hazards. Antarctica is no exception. During the last decades, the permanent settlement and seasonal presence of scientists, technicians, tourists and logistical personnel close to active
openaire   +2 more sources

Komatiitic explosive volcanism and its tectonic setting in Finland, the Fennoscandian (Baltic) Shield [PDF]

Bulletin of the Geological Society of Finland, 1990
The variously explosive komatiitic volcanism in Finland was virtually confined to the Archaean continental segment, where it occurred in the Lapland and Kuhmo‒ Suomussalmi greenstone belts between 3.0 Ga and 2.5 Ga, in the continental borderland at 1.97 ...
M. Saverikko
doaj   +1 more source

An Effusive Lunar Dome Near Fracastorius Crater: Spectral and Morphometric Properties

Remote Sensing, 2022
We examine a dome within the boundary between Fracastorius crater and Mare Nectaris. The dome has a noticeable vent structure and appears to be perpendicular to wrinkle ridges in the southern Mare Nectaris basin.
Caitlin Ahrens, Raffaello Lena
doaj   +1 more source

Impact of volcanism on the sedimentary record of the Neuquén rift basin, Argentina: towards a cause and effect model [PDF]

, 2018
The analysis of volcano-sedimentary infill in sedimentary basins constitutes a challenge for basin analysis and hydrocarbon exploration worldwide. In order to understand the contribution of volcanism to the sedimentary record in rift basins, we study the
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core   +1 more source

Thallium isotopes reveal protracted anoxia during the Toarcian (Early Jurassic) associated with volcanism, carbon burial, and mass extinction

Proceedings of the National Academy of Sciences of the United States of America, 2018
Significance Declining oxygen contents in today’s oceans highlight the need to better understand ancient, natural marine deoxygenation and associated extinctions.
T. Them, Benjamin C Gill, A. Caruthers, A. Gerhardt, D. Gröcke, T. Lyons, S. Marroquín, S. Nielsen, J. Trabucho Alexandre, J. Owens   +9 more
semanticscholar   +1 more source

The geology and geochronology of Al Wahbah maar crater, Harrat Kishb, Saudi Arabia [PDF]

, 2014
Al Wahbah is a large (∼2.2 km diameter, ∼250 m deep) maar crater in the Harrat Kishb volcanic field in western Saudi Arabia. It cuts Proterozoic basement rocks and two Quaternary basanite lava flows, and is rimmed with an eroded tuff ring of debris from ...
Abdel Wahab, Antar, Abul Maaty, Mostafa A., Awad, Hesham, Kafafy, Aziz, Stuart, Finlay M.   +4 more
core   +1 more source

Does large igneous province volcanism always perturb the mercury cycle? Comparing the records of Oceanic Anoxic Event 2 and the end-Cretaceous to other Mesozoic events

American Journal of Science, 2018
Mercury (Hg) is increasingly being used as a sedimentary tracer of Large Igneous Province (LIP) volcanism, and supports hypotheses of a coincidence between the formation of several LIPs and episodes of mass extinction and major environmental perturbation.
L. Percival, H. Jenkyns, T. Mather, A. Dickson, S. Batenburg, M. Ruhl, S. Hesselbo, R. Barclay, I. Jarvis, S. Robinson, Lineke Woelders   +10 more
semanticscholar   +1 more source