Results 11 to 20 of about 2,061 (160)
High-precision geochronology confirms voluminous magmatism before, during, and after Earth's most severe extinction. [PDF]
Sci Adv, 2015 The end-Permian mass extinction was the most severe in the Phanerozoic, extinguishing more than 90% of marine and 75% of terrestrial species in a maximum of 61 ± 48 ky.
Burgess SD, Bowring SA.
europepmc +3 more sources
Earth and Space ScienceThe Charity Shoal structure is a circular, ∼1.2‐km‐diameter, bedrock‐rimmed shoal in eastern Lake Ontario with a ∼20‐m‐deep central basin. The structure has been proposed as a possible Middle Ordovician impact crater or volcanic intrusion.
Mary H. Armour +3 more
doaj +2 more sources
Magmatic evolution of Panama Canal volcanic rocks: A record of arc processes and tectonic change. [PDF]
PLoS ONE, 2017 Volcanic rocks along the Panama Canal present a world-class opportunity to examine the relationship between arc magmatism, tectonic forcing, wet and dry magmas, and volcanic structures.
David W Farris +4 more
doaj +2 more sources
The Hornsby Quarry Geosite, NSW, Australia—A Geoheritage Treasure
Land, 2022 Quarrying for aggregate material at Hornsby in New South Wales (Australia) exposed a >100 m-deep cross-section of the volcanic neck of a Jurassic diatreme, which extruded through the Sydney Basin deposits.
Trudi A. Semeniuk
doaj +1 more source
Mineral chemistry from the Alfeu-I lamproite (Southern Brazil) and its contribution to understand the mantle heterogeneity under South American Plate during the Gondwana breakup [PDF]
Brazilian Journal of Geology, 2023 The Alfeu-I lamproite is one of the few alkaline rock occurrences in the South of Brazil that represents the alkaline event related to the South Atlantic opening and the enormous magmatic activity that formed the Paraná basalts.
Larissa Colombo Carniel +7 more
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Earth and Space Science, 2023 Maar‐diatreme volcanoes are small volcanic structures with a funnel‐shaped crater surrounded by a tephra‐ring. They are usually formed by the explosive phreatomagmatic eruptions when groundwater comes into the contact with magma.
Pavla Hrubcová +11 more
doaj +1 more source
Геодинамика и тектонофизика, 2022 Petrophysical, tectonophysical and paleomagnetic studies were done on the field of diamonds from the Komsomolskaya kimberlite pipe to interpret the observed gravimagnetic field. As a result of studying the structural-material complexes (SMC) of the field,
K. M. Konstantinov, A. S. Gladkov
doaj +1 more source
Physical experiments of land subsidence within a maar crater: insights for porosity variations and fracture localization [PDF]
Proceedings of the International Association of Hydrological Sciences, 2015 We present the results of a series of physical models aiming to reproduce rapid subsidence (at least 25 m in 30 years) observed in the sediments of a maar crater caused by extraction of groundwater in the interconnected adjacent aquifer.
M. Cerca +3 more
doaj +1 more source
Journal of Palaeogeography, 2021 As the second common type of volcanic vent on Earth, maar-diatreme volcanoes and their post-eruptive lacustrine sediments are a main focus of volcanology, palaeolimnology, palaeoclimatology and palaeontology.
Cong Chen +5 more
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Applied Sciences, 2021 We present the results of field and experimental studies to assess the influence on the formation of the radon field over the kimberlite pipes of the Arkhangelsk diamondiferous province.
Evgeny Yakovlev, Andrey Puchkov
doaj +1 more source