Results 31 to 40 of about 2,520 (206)

Late Cretaceous Construction of the Mantle Lithosphere Beneath the Central California Coast Revealed by Crystal Knob Xenoliths

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, J. B. Saleeby, M. N. Ducea, P. Luffi, P. D. Asimow   +4 more
doaj   +1 more source

On the age of white anorthosite of the Novomirgorod massif of the Korsun-Novomirgorod pluton (the Ukrainian Shield)

Геофизический журнал, 2014
Xenolites of white anorthosites have been found in anorthosites of the main phase of the Novom-irgorod massif of the Korsun-Novomirgorod pluton (the Ukrainian Shield, the Ingul megablock).
E. E. Shestopalova, L.M. Stepanyuk, T. I. Dovbush, A. V. Kovtun   +3 more
doaj   +1 more source

Mantle and Crustal Xenoliths in a Tephriphonolite From La Palma (Canary Islands): Implications for Phonolite Formation at Oceanic Island Volcanoes

Frontiers in Earth Science, 2022
The occurrence of mantle-derived peridotite xenoliths in phonolitic melts is a rare phenomenon, and is commonly ascribed to a mantle origin of the phonolite.
Andreas Klügel, Elmar Albers, Thor H. Hansteen   +2 more
doaj   +1 more source

Evolution of the volcanic plumbing systemof Alicudi (Aeolian Islands - Italy): evidence from fluid and melt inclusionsin quartz xenoliths

Annals of Geophysics, 2004
Quartz-rich xenoliths in lavas (basalts to andesites; 90-30 ka) from Alicudi contain abundant melt and fluid inclusions. Two generations of CO2-rich fluid inclusions are present in quartz-rich xenolith grains: early (Type I) inclusions related to partial
A. Peccerillo, V. Zanon, M. L. Frezzotti, R. Bonelli   +3 more
doaj   +1 more source

Kyanite-bearing eclogite xenoliths from the Udachnaya kimberlite, Siberian craton, Russia [PDF]

BSGF - Earth Sciences Bulletin, 2017
Xenoliths brought up by kimberlite magmas are rare samples of otherwise inaccessible lithospheric mantle. Eclogite xenoliths are found in most cratons and commonly show a range of mineral and chemical compositions that can be used to better understand ...
Radu Ioana-Bogdana, Moine Bertrand, Ionov Dmitri, Korsakov Andrey, Golovin Alexander, Mikhailenko Denis, Cottin Jean-Yves   +6 more
doaj   +1 more source

Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruption: Observations from Thríhnúkagígur Volcano, Iceland

Volcanica, 2022
Thríhnúkagígur Volcano, Iceland, is a composite spatter cone and lava field characteristic of basaltic fissure eruptions. Lava drainback at the end of the eruption left ~60 m of evacuated conduit, and a 4 × 104 m3 cave formed by the erosion of ...
Michael R Hudak, Maureen D Feineman, Peter C LaFemina, Halldór Geirsson, Samuele Agostini   +4 more
doaj   +1 more source

Lower crustal zircons reveal Neogene metamorphism beneaththe Pannonian Basin (Hungary)

Open Geosciences, 2015
Neogene alkaline intraplate volcanic depositsin the Pannonian Basin (Hungary) contain many lowercrustal granulite-facies xenoliths. U-Pb ages have been determinedfor zircons separated from a metasedimentaryxenolith, using LA-ICPMS and SHRIMP techniques ...
Downes Hilary, Carter Andrew, Armstrong Richard, Dobosi Gabor, Embey-Isztin Antal   +4 more
doaj   +1 more source

NanoSIMS mapping and LA-ICP-MS chemical and U-Th-Pb data in monazite from a xenolith enclosed in andesite (Central Slovakia Volcanic Field) [PDF]

, 2021
In this study, we use NanoSIMS element and isotope ratio mapping and LA-ICP-MS trace element measurements to elucidate the origins of monazites from a restitic xenolith enclosed in a 13.5±0.3Ma andesitic lava (Slovakia).
Bosse, V., Paquette, J., Didier, A., Viala, M., Bouloton, J., Devidal, J., Duhamel, R., Mostefaoui, S.   +7 more
core  

Heterogeneous Exhumation Mechanisms in Neoproterozoic Collisional Metamorphism: P–T Constraints From Pelotas and Punta del Este Terranes, Southern Brazil and Uruguay

Geological Journal, EarlyView.
Petrography, thermobarometry, and pseudosection modelling reveal peak metamorphic conditions of 3–7.5 kbar and 520°C–800°C in Tonian‐Cryogenian orthogneisses of the Dom Feliciano Belt. Metamorphic field gradients of 27°C/km–39°C/km and variable exhumation mechanisms support correlation of these units as remnants of a Himalayan‐type Piratini Orogeny ...
Thaiane Niederauer‐Santos, Carla Cristine Porcher, Daniel Triboli Vieira, Edinei Koester, Diego Jaldín, Karina Luengo, Luisa Caon   +6 more
wiley   +1 more source

A XENOLITH-BASED LITHOSPHERIC TRANSECT OF THE SLAVE CRATON, N.W.T., CANADA [PDF]

, 2012
During the last decade, the Canadian Slave craton has emerged as an important global diamond resource. Recent work on the sub-continental lithospheric mantle (SCLM) beneath this craton has yielded tantalising suggestions about its structure and ...
MATHER, KATHLEEN,ANN
core