Results 31 to 40 of about 5,185 (202)
Nature, 1961 A FIELD and laboratory study of the Ordovician ignimbrites of North Wales that has been in progress since 19531–3 has revealed certain limitations in Marshall's original hypothesis4 regarding the origin of this interesting category of rocks. These limitations have been apparent to workers elsewhere5–8.
openaire +1 more source
Mekanisme erupsi ignimbrit Kaldera Maninjau, Sumatera Barat
Indonesian Journal on Geoscience, 2014 http://dx.doi.org/10.17014/ijog.vol2no1.20073Maninjau is a large collapsed caldera that was resulted from a large eruption of silicic pyroclastic material (220-250 km3), and was distributed to more than 75 km away from the source. Field observations have
Agung Pribadi +2 more
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Volcanological and Geochemical Features of the Products of Sabalan’s Last Eruption, NW Iran [PDF]
پترولوژی, 2019 Sabalan volcano is located in the northwest part of Iran and 25km south of Meshkinshahr in the west Alborz-Azerbaijan structural zone. The rocks forming the Sabalan and its eastern and northern slopes are covered with significant amounts of white-gray ...
Reza Fahim Guilany +3 more
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On the age of the Harsány ignimbrite, Bükkalja volcanic field, Northern Hungary — a discussion [PDF]
, 2009 Correlation of scattered ignimbrite occurrences is crucial in the context of stratigraphy and the volcanic history of an area. In 2007, two papers were published concerning the classification of the volcanic rocks of the Bükkalja volcanic field.
Réka Lukács +3 more
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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 +7 more
wiley +1 more source
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 +3 more
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Kesesuaian Lahan Untuk Tanaman Kopi di Area Sekitar Danau Toba
Majalah Geografi IndonesiaAbstrak Youngest Toba Tuff (YTT) merupakan material pembentuk tanah andosol yang dominan di Kaldera Toba. YTT memiliki karakteristik yang berbeda dengan tanah andosol hasil dari material gunungapi aktif.
Indra Agus Riyanto +4 more
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Composition and correlation criteria of the rhyolitic ignimbrites in the Monts Dore volcanic field (France) [PDF]
BSGF - Earth Sciences Bulletin, 2016 Rhyolitic pyroclastic deposits, mostly ignimbrites (ash-and-pumice flow deposits) from plinian eruptions belonging to the early activity (> 2.5 Ma) of the Plio-Quaternary Monts Dore volcanic field (Massif central, France) are documented in order to ...
Bourdier Jean-Louis +3 more
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Evolution of the magma system of Pantelleria (Italy) from 190 ka to present
Comptes Rendus. Géoscience, 2021 The eruptive history of Pantelleria has been marked by the eruption of nine peralkaline ignimbrites, with inter-ignimbrite episodes from small, local volcanic centres.
Jordan, Nina J. +3 more
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Managing and visualising geochemical data for tephra correlation with the IntChron Integration Tool
Journal of Quaternary Science, EarlyView.ABSTRACT There is now a wealth of glass‐shard geochemical data for volcanic ash (tephra) layers from a wide range of volcanoes and eruptions, providing invaluable datasets for tephrochronology. However, compilation of published data to assess tephra correlations leads to large files and requires careful management.
Victoria C. Smith +5 more
wiley +1 more source