Results 11 to 20 of about 296 (107)

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Geochemistry, Geophysics, Geosystems
Sedimentary carbonates are known to be carried into the deep mantle by subducted slabs, and studies on mantle‐derived magmas have attempted to trace the recycled carbonate in their mantle source.
Bowen Wei, Zhaochong Zhang, Zhiguo Cheng, Qiuhong Xie, M. Santosh, Weiliang Kong, Bingxiang Liu, Marc K. Reichow, Yingjie Li   +8 more
doaj   +7 more sources

Geochemical studies and economic perspective of light rare earth element (LREE) enriched carbonatite from Khaderpet, Eastern Dharwar Craton

Discover Geoscience
An account of petrographic features, geochemical character, enriched light rare earth elements (LREEs), and stable isotope (C–O) concentrations in carbonatite occurring in association with lamprophyre clan rock (LCR) from Khaderpet is presented here. The
Pothuri Ramesh Chandra Phani, Prabir Sengupta   +1 more
doaj   +2 more sources

Hydrogen Concentrations and He Isotopes in Olivine From Ultramafic Lamprophyres Provide New Constraints on a Wet Tarim Plume and Earth's Deep Water Cycle

Journal of Geophysical Research - Solid Earth, 2022
Water enters Earth's mantle via subduction of hydrated oceanic slab and largely returns to the ocean‐atmosphere system through arc volcanism. However, the extent to which H2O is transferred into the deep mantle is poorly constrained.
Changhong Wang, Zhao-Chong Zhang, A. Giuliani, S. Demouchy, C. Thoraval, L. Krmíček, Hongze Bo, Wan-Feng Zhang, X. Xia   +8 more
semanticscholar   +2 more sources

An Aillikite Dyke From Sutherland, Scotland [PDF]

, 2014
A 0.2 to 1m thick ESE-WNW aillikite dyke cuts Moine psammites a few km east of the Moine Thrust, in Glen Golly, Sutherland. While such rocks are known in Greenland, Labrador and Finland (where they are associated with diamond and/or REE carbonatite ...
Hughes, J., Upton, B.J.G., Ntaflos, T., Ellam, R., Faithfull, J.   +4 more
core   +7 more sources

IMPLICATIONS OF MAJOR ELEMENT COMPOSITION FOR THE MANTLE SOURCES OF KIMBERLITE, AILLIKITE, OLIVINE LAMPROIITE, AND MEIMECHITE

International Kimberlite Conference Extended Abstracts: 2003, 2003
D. Francis
semanticscholar   +3 more sources

Southwestern Africa on the burner: Pleistocene carbonatite volcanism linked to deep mantle upwelling in Angola

, 2017
The origin of intraplate carbonatitic to alkaline volcanism in Africa is controversial. A tectonic control, i.e., decompression melting associated with far-field stress, is suggested by correlation with lithospheric sutures, repeated magmatic cycles in ...
A. Giuliani, M. Campeny, Vadim Kamenetsky, J. Afonso, R. Maas, J. Melgarejo, B. Kohn, E. Matchan, J. Mangas, A. O. Gonçalves, J. Manuel   +10 more
semanticscholar   +3 more sources

Genesis of Ultramafic Lamprophyres and Carbonatites at Aillik Bay, Labrador: a Consequence of Incipient Lithospheric Thinning beneath the North Atlantic Craton [PDF]

, 2006
Numerous dykes of ultramafic lamprophyre (aillikite, mela-aillikite, damtjernite) and subordinate dolomite-bearing carbonatite with U-Pb perovskite emplacement ages of similar to 590-555 Ma occur in the vicinity of Aillik Bay, coastal Labrador.
S. Tappe, S. Foley, G. Jenner, L. Heaman, B. Kjarsgaard, R. Romer, A. Stracke, N. Joyce, J. Hoefs   +8 more
semanticscholar   +2 more sources

Mapping the Structure and Metasomatic Enrichment of the Lithospheric Mantle Beneath the Kimberley Craton, Western Australia

Geochemistry, Geophysics, Geosystems, Volume 24, Issue 9, September 2023., 2023
Abstract The lithology, geochemistry, and architecture of the continental lithospheric mantle (CLM) underlying the Kimberley Craton of north‐western Australia has been constrained using pressure‐temperature estimates and mineral compositions for >5,000 newly analyzed and published garnet and chrome (Cr) diopside mantle xenocrysts from 25 kimberlites ...
Z. J. Sudholz, A. L. Jaques, G. M. Yaxley, W. R. Taylor, K. Czarnota, M. W. Haynes, L. Frewer, R. R. Ramsay, P. J. Downes, S. A. Cooper   +9 more
wiley   +1 more source

Geodynamic and Isotopic Constraints on the Genesis of Kimberlites, Lamproites and Related Magmas From the Finnish Segment of the Karelian Craton

Geochemistry, Geophysics, Geosystems, Volume 23, Issue 8, August 2022., 2022
Abstract Despite the scientific and economic significance of kimberlites and related magmas, their origin is unclear. Here, we address this issue using whole‐rock and perovskite‐derived Sr‐Nd‐Hf isotopes for the three occurrences of kimberlite, lamproites and ultramafic lamprophyres (UMLs) in Finland.
Hayden Dalton, Andrea Giuliani, Janet Hergt, David Phillips, Hugh O’Brien, Maxim D. Ballmer, Roland Maas, Jon Woodhead   +7 more
wiley   +1 more source

U–Pb (ID-TIMS) Age of Garnet from Aillikites of the Kola Alkali Province

Doklady Earth Sciences, 2023
Abstract The U–Pb (ID-TIMS) geochronological studies of garnet from aillikites of the Kandalaksha dike swarm (Kola alkali province) were carried out. The estimated U–Pb age of garnet (374 ± 3 Ma) coincides with the major stage (373–377 Ma) of alkali magmatism in the Kola Province (LIP).
M. V. Stifeeva, E. B. Salnikova, A. A. Nosova, A. B. Kotov, A. A. Voznyak, D. A. Dimitrova   +5 more
openaire   +1 more source