Results 21 to 30 of about 112,950 (202)
The lithospheric mantle and lower crust–mantle relationships under Scotland: a xenolithic perspective [PDF]
Journal of the Geological Society, 2011 Abstract: In the British Isles the majority of volcanic rocks containing upper mantle and lower crustal xenoliths occur in Scotland. Most of the occurrences are of Carboniferous–Permian age. This paper presents new data on the mineral chemistry of spinel lherzolite xenoliths from the five principal Scottish tectonic terranes ...
B. G. J. UPTON +5 more
openaire +2 more sources
Geologica Carpathica, 2015 In this paper we present the petrography and geochemistry of a recently collected lherzolite-websterite xenolith series and of clinopyroxene xenocrysts, hosted in Upper Cretaceous–Paleogene basanites of Poiana Ruscă (Romania), whose xenoliths show ...
Nédli Zsuzsanna +2 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2021 Spatio‐temporal changes of upper mantle structure play a significant role in generating and maintaining surface topography. Although geophysical models of upper mantle structure have become increasingly refined, there is a paucity of geologic constraints
P. W. Ball +4 more
doaj +1 more source
Applied Sciences, 2021 The major and trace elements of Quaternary alkaline volcanic rocks on Jeju Island were analyzed to determine their origin and formation mechanism. The samples included tephrite, trachybasalts, basaltic trachyandesites, tephriphonolites, trachytes, and ...
Cheolhong Kim +4 more
doaj +1 more source
Cu‐Isotope Evidence for Subduction Modification of Lithospheric Mantle
Geochemistry, Geophysics, Geosystems, 2022 Ultramafic xenoliths from southeastern Arizona, USA, provide evidence for Cu‐isotope heterogeneity in the lithospheric mantle. We report new data on Type I (Cr‐, Mg‐rich) peridotites, but also the first Cu‐isotope data for Fe‐Ti‐Al‐rich Type II ...
Pamela D. Kempton +5 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2018 The Pleistocene (1.65 Ma) Crystal Knob volcanic neck in the California Coast Ranges is an olivine‐plagioclase phyric basalt containing dunite and spinel peridotite xenoliths.
D. P. Quinn +4 more
doaj +1 more source
Kuangchan zonghe liyong, 2022 Bengge alkaline igneous complex in Zhongdian, Western Yunnan has the variety of rock types, which is production after a complex magma—fluid process. The petrographical and mineralogical analysis of the host rock and its xenolith suggests that the igneous
Yupeng Huang +6 more
doaj +1 more source
Rare earth element characteristics of pyrope garnets from the Kaavi-Kuopio kimberlites - implications for mantle metasomatism [PDF]
Bulletin of the Geological Society of Finland, 2005 Peridotitic garnet xenocrysts from five kimberlite pipes in the Kaavi-Kuopio area of eastern Finland have been studied using major and trace element geochemistry to obtain information on the stratigraphy, compositional variability and evolutionary ...
M. Lehtonen
doaj +1 more source
AGU Advances, 2023 Mid‐lithosphere discontinuities are seismic interfaces likely located within the lithospheric mantle of stable cratons, which typically represent velocities decreasing with depth.
Tianze Liu, Emily J. Chin, Peter Shearer
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2023 We present constraints on the hydration state and rheology of the lithospheric mantle beneath the North Anatolian fault zone (NAFZ). Peridotite xenoliths from the Biyikali and Çorlu volcanic centers record deformational microstructures consistent with ...
A. D. Lusk +3 more
doaj +1 more source