Results 51 to 60 of about 858 (191)

Vanadium Isotopic Compositions of the High‐3He/4He Baffin Island Lavas

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract The isotopic composition of vanadium (V) in hotspot lavas provides new insight into the source of deep mantle heterogeneities. We measured V isotopic compositions in Paleogene Baffin Island lavas, which erupted above the Iceland plume head, to constrain the mantle plume source. These lavas have V isotopic compositions that are lighter (−0.96 ± 
Jonas Kaare‐Rasmussen, Forrest Horton, Maureen Auro, Andy W. Heard, Sune G. Nielsen   +4 more
wiley   +1 more source

Origin of Picrite Blocks Near Wells [PDF]

Geological Magazine, 1958
Pieces of picrite found in 1904 in a field at Ebbor Rocks, near Wells, Somerset, western England, probably came from the Menheniot quarries which were the source of ballast used in the area. Comparison of thin sections supports this conclusion.
openaire   +1 more source

Late Cretaceous-Early Paleogene volcanic rocks of Eastern Kamchatka (сomposition and isotopic-geochemical heterogeneity)

Вестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле
New and previously published isotope-geochemical material on the Upper Cretaceous-Lower Paleogene volcanic complexes of the Ozernovsky-Valaginsky segment of the Achaivayam-Valaginsky paleoarc are presented. It is found that composition of rocks composing
N.V. Tsukanov, P.I. Fedorov, D.V. Kovalenko   +2 more
doaj   +1 more source

Hotspot magmatism and volcanic hazard at Cape Verde through the lens of shipborne surveying and dredging

Geology Today, Volume 42, Issue 4, Page 174-182, July/August 2026.
The Cape Verde archipelago is a long‐lived volcanic ocean island chain formed by a mantle plume in the Atlantic Ocean. The archipelago is characterized by ten subaerial islands with complex age relationships, abundant submarine volcanism and variable volcanic hazards.
Brian Oller, Hunter R. Edwards, Yash Srivastava, Abigail K. Barker, Alex Kovalick, Giovanni Lima, Cornelia Nilsson, Marine Paquet, Easton Satin‐Shaw, Isaias Teixeira, M. Jeff Buxton, Noah DesRosiers, Mason Schettig, James M.D. Day   +13 more
wiley   +1 more source

Melt Diversity and Magmatic Evolution in the Dali Picrites, Emeishan Large Igneous Province

, 2018
Picrites are potentially near-primary melts that offer rare insights into the earliest stages of magmatic evolution. However, without detailed investigation of magmatic processes, robust records of early melt evolution and mantle melting behavior cannot ...
Ren, Zhong-Yuan, Zhong‐Yuan Ren, Zhang, Le, Wang, Yu, Ya‐Dong Wu, Wang, Christina Yan, Monica R. Handler, Wu, Ya-Dong, Le Zhang, Yi‐Gang Xu, Qian, Sheng-Ping, Christina Yan Wang, Xu, Yi-Gang, Sheng‐Ping Qian, Lin‐Li Chen, Chen, Lin-Li, Handler, Monica R., Yu Wang   +17 more
core   +1 more source

The Distribution of Olivine Compositions in Icelandic Basalts and Picrites [PDF]

Journal of Petrology, 2012
A number of recent studies have used the compositional relationship between magmatic crystals and their carrier liquids to understand processes within volcanic plumbing systems. Here, an extensive compilation of electron microprobe data for Icelandic olivine and glass compositions is used to examine the distribution of the forsterite content of olivine
Thomson, Andrew R, Maclennan, John
openaire   +2 more sources

Geochemical investigation of impactites from the Boltysh impact structure and possible relationship to early Danian sediments from the Umbria–Marche Basin, Italy

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1309-1332, July 2026.
Abstract Within the Danian Scaglia Rossa Formation appears a regionally correlatable horizon cutting across multiple sections and outcrops within the Umbria–Marche Basin of NE Italy, where it is intercalated with uniform pelagic carbonate successions. This horizon is called “ALE layer” and has tentatively been interpreted as a fine‐grained volcanic ash.
Toni Schulz, Sophia Wernitznig, Christian Koeberl, Bérengère Mougel, Alessandro Montanari, Frédéric Moynier   +5 more
wiley   +1 more source

On the source regions for mare picrite glasses [PDF]

Journal of Geophysical Research: Planets, 2000
Models for the crystallization of the magma ocean, phase equilibria constraints, and geochemical criteria constrain the mare basalt source region to lie deep within the Moon and within olivine‐orthopyroxene cumulate layers of the magma ocean. The Mg* compositions of the mare basalt source region, the ferroan anorthosite crust and the mg‐suite ...
openaire   +1 more source

Deep Origin and Shallow Launch for the Etna 122 B.C. Mafic Plinian Eruption

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract Basaltic Plinian eruptions challenge our understanding of explosive volcanism. The 122 B.C. Plinian eruption of Etna ranks among the most powerful mafic explosive events known. Here, we combine volatile barometry of 122 B.C. from olivine‐hosted melt and fluid inclusions with comparative data from the sub‐Plinian Fall Stratified eruption at ...
M. Gavrilenko, E. Gazel, K. Dayton, A. Barth, T. Plank, E. G. Huggins, B. Houghton   +6 more
wiley   +1 more source

Deep mantle plume osmium isotope signature from West Greenland Tertiary picrites

, 2000
Picrites from Nuussuaq Peninsula and Qeqertarssuaq (Disko) Island, West Greenland, preserve trace element and isotopic signatures reflecting the composition of the Icelandic plume head. Os isotope ratios are low (187Os/188Os(i)=0.1272–0.1371) in terms of
Hawkesworth, Chris, Schaefer, Bruce F., Hawkesworth, Chris J., Parkinson, I J, Parkinson, Ian, Schaefer, B F, Parkinson, Ian J., Ian J Parkinson, Bruce F Schaefer, Chris J Hawkesworth   +9 more
core   +3 more sources