Results 31 to 40 of about 824 (171)
PETROLOGICAL AND GEOCHEMICAL STUDY OF CRUSTAL XENOLITHS FROM 1961 ERUPTION OF CALBUCO VOLCANO, CHILE (LATITUDE 41 20 S ) [PDF]
Journal of Sciences, Islamic Republic of Iran, 1992 Twenty four samples of xenoliths and country rocks from the 1961 lava flow of Calbuco volcano have been studied. Fourteen samples have been analyzed for major elements and P, Ni, Ba, Cr, V, Zr, Sc, Y, and Sr.
doaj
Geochemistry, Geophysics, GeosystemsMantle xenoliths recovered from the modern backarc region of the northern Altiplano Plateau record metasomatism by slab‐derived silicic melts, and a suite of Quaternary volcanics suggest that melting of accreted crustal material has persisted since ...
C. D. Hiett +2 more
doaj +1 more source
Sheared lherzolite xenoliths revisited [PDF]
Journal of Geophysical Research: Solid Earth, 2008 The microstructures of sheared lherzolite xenoliths from South African kimberlites are investigated using new microstructural analysis techniques and new rheological data. By applying electron backscatter diffraction (EBSD) methods and the M‐index technique for quantifying the strength of lattice preferred orientation (LPO), it is demonstrated that ...
Philip Skemer, Shun‐ichiro Karato
openaire +1 more source
Open Geosciences, 2017 We examined the petrography, petrology, and geochemistry of two types of gabbroic xenoliths (A- and B-type xenoliths) in olivine basalt and biotite rhyolite units among the dominantly rhyolitic rocks in Niijima volcano, northern Izu-Bonin volcanic arc ...
Arakawa Yoji +5 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2023 We present data for lithospheric mantle xenoliths sampled from two alkali basalts in south‐central Vietnam, Pleiku and Xuan Loc, including fertile spinel peridotites.
Kirby P. Hobbs +4 more
doaj +1 more source
Frontiers in Earth Science, 2021 The chemical and isotopic compositions of volcanic arc lavas often show evidence for involvement of a sedimentary component during magma genesis. Determining where this sedimentary component is added to arc magmas is of vital importance for constraining ...
J. R. Brown +5 more
doaj +1 more source
The partial heat – longest plateau technique: Testing TL dating of Middle and Upper Quaternary volcanic eruptions in the Eifel Area, Germany [PDF]
Eiszeitalter und Gegenwart, 2009 Middle and Upper Quaternary volcanic events are often difficult to date, in particular when minerals suitable for 40Ar/39Ar-dating are missing. Here, we present first tests of a newly developed technique to use the thermoluminescence (TL) of maar tephra ...
L. Zöller, H. Blanchard
doaj +1 more source
Journal of the Geological Survey of Brazil, 2022 We present new petrographic and chemical data together with calculated P-T equilibrium conditions of peridotite xenoliths enclosed in kimberlites from Rondônia, Northern Brazil (Cosmos-1 and Carolina-1) and Minas Gerais, Southeastern Brazil (Canastra-1)
Vidyã Vieira Almeida +4 more
doaj +1 more source
Geochemical signatures and melt inclusion evidence in peridotite xenoliths of Sinsanri, South Korea
Open GeosciencesJeju Island, located in South Korea, is a Cenozoic intraplate volcanic feature in the East Asian region. The Sinsanri area on Jeju Island is well-known for its rich presence of xenoliths, making it a key site for finding these geological features ...
Khant Naing Aung +4 more
doaj +1 more source
Carbonatite metasomatism overprinted by silicate melt metasomatism in the mantle beneath the West Eifel volcanic field [PDF]
European Journal of MineralogyThe texture and mineral compositions of mantle xenoliths from the West Eifel volcanic field (WEVF) reveal three distinct mantle events. The first, identified in LREE-depleted and isotopically depleted anhydrous (type Ib) xenoliths, resulted from partial ...
B. E. Bromley +3 more
doaj +1 more source