Results 31 to 40 of about 9,905 (218)

Magnesium and Calcium Isotopic Geochemistry of Silica‐Undersaturated Alkaline Basalts: Applications for Tracing Recycled Carbon

open access: yesGeochemistry, Geophysics, Geosystems, 2022
Carbon plays important roles in the evolution of the atmosphere and biosphere, and geochemical differentiation in Earth's interior. Most subducted C is recycled to the deep mantle and returns to the surface by degassing from erupted basalts and ...
Yue Qi   +4 more
doaj   +1 more source

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region [PDF]

open access: yes, 2006
During Tertiary to Quaternary times, convergence between Eurasia and Africa resulted in a variety of collisional orogens and different styles of subduction in the Alpine-Mediterranean region.
Downes, Hilary   +2 more
core   +1 more source

Metasomatism in oceanic and continental lithospheric mantle: introduction [PDF]

open access: yesGeological Society, London, Special Publications, 2007
s CD. BODINIER, J.-L., MENZIES, M. A., SHIMIZU, N., FREY, F. A. & MCPHERSON, E. 2004. Silicate, hydrous and carbonate metasomatism at Lherz, France: contemporaneous derivatives of silicate melt–harzburgite reaction. Journal of Petrology, 45, 299–320. BONADIMAN, C., BECCALUVA, L., COLTORTI, M. & SIENA, F. 2005.
COLTORTI, Massimo, Gregoire M.
openaire   +2 more sources

LITHOSPHERIC MANTLE COMPOSITION AND STRUCTURE VARIATIONS UNDER THE SIBERIAN PLATFORM KIMBERLITE FIELDS OF DIFFERENT AGES

open access: yesГеодинамика и тектонофизика, 2022
We discuss herein the differences both in composition and structure of the lithospheric mantle of the Siberian Platform under kimberlite fields of different ages.
N. P. Pokhilenko   +4 more
doaj   +1 more source

Geochemical Consequences of Melt Percolation: The Upper Mantle as a Chromatographic Column [PDF]

open access: yes, 1987
As magmas rise toward the surface, they traverse regions of the mantle and crust with which they are not in equilibrium; to the extent that time and the intimacy of their physical contact permit, the melts and country rocks will interact chemically. We
Navon, Oded, Stolper, Edward
core   +1 more source

Patched removal of the mantle lithosphere under orogens: A systematic numerical study

open access: yesFrontiers in Earth Science, 2023
Delamination or convective thinning could cause large-scale and complete removal of the mantle lithosphere under orogens. However, geological and geophysical observations suggest that patched removal of the mantle lithosphere has occurred in some orogens,
Tian Lei   +6 more
doaj   +1 more source

Petrogenesis and Sr-Nd isotope Geochemistry of Neogene Igneous Rocks in the Goloumak Area, South of Kerman, Iran [PDF]

open access: yesJournal of Sciences, Islamic Republic of Iran, 2023
The study area is near Goloumak village, 30 km south of Kerman. These rock units consist of acidic rhyolite and dacite, as well as intermediate andesite, basalt, and trachy-andesite.
Farzaneh Arzhangnegad   +3 more
doaj   +1 more source

Archaean and Proterozoic diamond growth from contrasting styles of large-scale magmatism [PDF]

open access: yes, 2017
Precise dating of diamond growth is required to understand the interior workings of the early Earth and the deep carbon cycle. Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa.
Chinn, Ingrid L.   +5 more
core   +3 more sources

Gold, platinum and palladium enrichments in arcs: role of mantle wedge, arc crust and halogen-rich slab fluids [PDF]

open access: yesE3S Web of Conferences, 2019
Arc-related magmas are frequently enriched in Au, Pt and Pd in respect to MORB and OIB igneous suites. Magmatic arcs commonly host large-scale hydrothermal Au and Au-Cu and PGE mineralization related to young volcanic systems and zoned ultramafic ...
Kepezhinskas Pavel   +2 more
doaj   +1 more source

Global Patterns in Cratonic Mid‐Lithospheric Discontinuities From Sp Receiver Functions

open access: yesGeochemistry, Geophysics, Geosystems, 2021
The goal of this study is to constrain the origins of layering in the seismic velocity structure within the cratonic mantle lithosphere (i.e. mid‐lithospheric discontinuities [MLDs]).
Hannah E. Krueger   +2 more
doaj   +1 more source

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