Results 91 to 100 of about 3,013 (217)

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: a review

, 2005
Igneous rocks of the Devonian Kola Alkaline Carbonatite Province (KACP) in NW Russia and eastern Finland can be classified into four groups: (a) primitive mantle-derived silica-undersaturated silicate magmas; (b) evolved alkaline and nepheline syenites; (
Balaganskaya, Elena, Demaiffe, Daniel, Beard, Andrew D., Demaiffe, D., Beard, Andrew, Downes, Hilary, Balaganskaya, E., Beard, Andy, Liferovich, R., Liferovich, Ruslan   +9 more
core   +1 more source

The development of magmatism along the Cameroon Volcanic Line: Evidence from teleseismic receiver functions

, 2012
[1] The Cameroon Volcanic Line (CVL) in West Africa is a chain of Cenozoic volcanism with no clear age progression. The reasons for its existence are unclear, and the nature of its magmatic plumbing system is poorly understood.
Bastow, I.D., Gallacher, R.J.
core   +1 more source

Metasomatism and fluid generation in mantle xenoliths

, 1987
The concept of metasomatism was developed in the study of crustal rocks, to describe a process of alteration that involves enrichment by new substances brought in from the outside by fluids, commonly considered to be dilute aqueous solutions or ...
Wyllie, P. J.
core  

Calcium isotopic signatures of carbonatite and silicate metasomatism, melt percolation and crustal recycling in the lithospheric mantle

, 2019
International audienceCa isotopes can be strongly fractionated at the Earth’s surface and thus may be tracers of subducted carbonates and other Ca-rich surface materials in mantle rocks, magmas and fluids.
Ionov, Dmitri A., Oleinikov, Oleg B., Anbar, Ariel D., Zheng, Wang, Huang, Fang, Golovin, Alexander, Zhang, Zhao-Feng, Kang, Jin-Ting, Golovin, Alexander, V, Ionov, Dmitri, Qi, Yu-Han   +10 more
core   +1 more source

Metasomatism and Melting of Cordilleran Lithosphere Resulting From Sediment Relamination During Shallow Subduction

Geochemistry, Geophysics, Geosystems
Mantle 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, D. L. Newell, J. W. Shervais   +2 more
doaj   +1 more source

Mantle metasomatism beneath the Siberian platform

, 1997
The composition and evolution of the upper mantle is recorded in deep-seated xenoliths, brought to the surface of the Earth by kimberlites. These xenoliths have experienced a wide variety of processes at varied temperatures and pressures during their ...
Sobolev, Vladimir
core  

Mid-Jurassic volcanism at Bokhara River and insights into metasomatism in the lithospheric mantle of the Thomson Orogen, eastern Australia

Eastern Australia is covered by extensive, thick regolith, which obfuscates much of its basement geology, making geological sampling difficult. The Bokhara River diatremes erupted through the Thomson Orogen in eastern Australia and are covered by ∼300 m ...
S. Foley (7681049), H. Dalton (18011970), A. Lanati (18011973), D. Phillips (2637844), J. Shea (18011967)   +4 more
core   +1 more source

Generation and Modification of the Mantle Wedge and Lithosphere beneath the West Bismarck Island Arc: Melting, Metasomatism and Thermal History of Peridotite Xenoliths from Ritter Island

, 2017
Peridotite xenoliths dredged from the seafloor northwest of Ritter Island in the West Bismarck Island Arc offer a rare insight into the petrogenetic processes operating in the upper mantle wedge of an active oceanic subduction zone.
Davidson, J.P., Dale, C W, Davidson, J P, R J Arculus, Tollan, P.M.E., Arculus, R.J., Arculus, R J, J Hermann, C W Dale, J P Davidson, Dale, C.W., Hermann, J., Hermann, Jörg, P M E Tollan, Tollan, Peter Michael Edward   +14 more
core   +1 more source

Water in Earth's mantle : Metasomatism and melting

This thesis investigates the role of water in generating some geochemical and geophysical features in the upper mantle that are thought to be related to melting and metasomatism. Dehydration melting of amphibole has been proposed as a possible mechanism causing the lithosphere-asthenosphere boundary.
openaire   +3 more sources

Ancient melt depletion overprinted by young carbonatitic metasomatism in the New Zealand lithospheric mantle

, 2014
Spinel facies dunite, harzburgite, lherzolite and wehrlite mantle xenoliths from a cluster of Miocene volcanoes in southern New Zealand record evidence for the complex evolution of the underlying mantle lithosphere.
Cooper, A.F., van der Meer, Quinten, Palin, J.M., Hodgkinson, A., Waight, Tod Earle, Scott, James M.   +5 more
core   +1 more source