Results 11 to 20 of about 3,013 (217)

Ultramafic Carbonated Melt‐ and Auto‐Metasomatism in Mantle Eclogites: Compositional Effects and Geophysical Consequences

Geochemistry, Geophysics, Geosystems, 2020
The mineralogy, chemical composition, and physical properties of cratonic mantle eclogites with oceanic crustal protoliths can be modified by secondary processes involving interaction with fluids and melts, generated in various slab lithologies upon ...
Sonja Aulbach, Malcolm Massuyeau, Joshua M. Garber, Axel Gerdes, Larry M. Heaman, K.S. Viljoen   +5 more
doaj   +2 more sources

Mantle melting versus mantle metasomatism – “The chicken or the egg” dilemma [PDF]

Chemical Geology, 2017
AbstractMost eclogitic mantle xenoliths brought to the surface exhibit a certain degree of enrichment with incompatible elements, usually attributed to the effect of mantle metasomatism by a putative metasomatic fluid. The metasomatic overprint is represented mainly by enrichments in Na, K, Ba, Ti and LREE and the original source of this fluid remains ...
Kiseeva, Ekaterina S., Kamenetsky, Vadim S, Yaxley, Greg, Shee, Simon R.   +3 more
core   +7 more sources

The role of continental subduction in mantle metasomatism and carbon recycling revealed by melt inclusions in UHP eclogites. [PDF]

Sci Adv, 2023
Subduction is the main process that recycles surface material into the mantle. Fluids and melts derived by dehydration and partial melting reactions of subducted continental crust, a major reservoir of volatiles (i.e., H2O and CO2) and incompatible ...
Borghini A, Nicoli G, Ferrero S, O'Brien PJ, Laurent O, Remusat L, Borghini G, Milani S.   +7 more
europepmc   +2 more sources

Quantitative mapping of the oxidative effects of mantle metasomatism

Geology, 2013
The oxidation state of Fe in garnets in a garnet peridotite xenolith from the Wesselton kimberlite (South Africa) was quantitatively mapped using X-ray absorption near edge structure (XANES) spectroscopy. Maps of Fe3+/ΣFe were produced by recording the fluorescence intensity at discrete energies rather than recording the full spectrum at each point ...
Berry, Andrew John, Yaxley, Gregory, Hanger, Brendan, Woodland, Alan, de Jonge, Martin, Howard, Daryl, Paterson, David, Kamenetsky, Vadim S   +7 more
openaire   +3 more sources

COH-fluid induced metasomatism of peridotites in the forearc mantle [PDF]

, 2022
Devolatilization of subducting lithologies liberates COH-fluids. These may become partially sequestered in peridotites in the slab and the overlying forearc mantle, affecting the cycling of volatiles and fluid mobile elements in subduction zones. Here we
Sieber, Melanie Jutta, Sieber, Melanie J., Yaxley, Greg (Prof.), Yaxley, Gregory M., Hermann, Jörg, Yaxley, Greg, Sieber, Melanie Jutta (Dr.)   +6 more
core   +1 more source

Oceanic Slab Melting and Mantle Metasomatism [PDF]

Science Progress, 2001
Modern plate tectonic brings down oceanic crust along subduction zones where it either dehydrates or melts. Those hydrous fluids or melts migrate into the overlying mantle wedge trigerring its melting which produces arc magmas and thus additional continental crust. Nowadays, melting seems to be restricted to cases of young (<50 Ma) subducted plates.
Scaillet, Bruno, Prouteau, Gaëlle
openaire   +3 more sources

Petrographical and Mineralogical Characteristics of Bengge Alkaline Igneous Complex in Zhongdian, Western Yunnan and Its Geological Significance

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, Jinxi Zou, Qingqiang Liu, Chunzhang Wu, Xianfan Liu, Jianghong Deng, Kefa Ren   +6 more
doaj   +1 more source

Origin of Fe‐Ca‐Metasomatism in Exhumed Mantle Rocks at the MARK Area (23°N, ODP Leg 153) and Implications on the Formation of Ultramafic‐Hosted Seafloor Massive Sulfide Deposits

Geochemistry, Geophysics, Geosystems, 2023
At Mid‐Ocean Ridges, hot, reduced, acidic, and metal‐rich fluids are responsible for the formation of ultramafic‐hosted seafloor massive sulfide deposits (UM‐SMSs), where mantle exhumation efficiently operates.
R. Coltat, M. Andreani, C. G. C. Patten, M. Godard, B. Debret, J. Escartin   +5 more
doaj   +1 more source

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

Geological 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

Martian magmatism from plume metasomatized mantle [PDF]

Nature Communications, 2018
AbstractDirect analysis of the composition of Mars is possible through delivery of meteorites to Earth. Martian meteorites include ∼165 to 2400 Ma shergottites, originating from depleted to enriched mantle sources, and ∼1340 Ma nakhlites and chassignites, formed by low degree partial melting of a depleted mantle source.
Day, James, Tait, Kimberly, Udry, Arya, Moynier, Frédéric, Liu, Yang, Neal, Clive   +5 more
openaire   +5 more sources