Results 41 to 50 of about 1,332 (160)

Plume–lithosphere interactions and LIP-triggered climate crises constrained by the origin of Karoo lamproites [PDF]

, 2023
We identified a ca. 180 Ma diamondiferous lamproite event in Zambia, establishing a link between ultrapotassic volcanism and the early Jurassic Karoo flood basalt province of sub-Saharan Africa.
Glodny, Johannes, Ngwenya, Ntando S., Romer, Rolf L., Schmitt, Axel K., Stracke, Andreas, Tappe, Sebastian   +5 more
core   +1 more source

Reconciling Seismic and Thermo‐Chemical Models of Cratonic Lithosphere

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract Most published global and regional shear‐wave (VS ${V}_{\mathrm{S}}$) velocity models of cratons include a VS ${V}_{\mathrm{S}}$ increase with depth below the Moho, with a maximum at 100–150 km depth. This feature has long been debated, as it appears to require either (implausible) temperature decreases with depth, or substantial, layered ...
Sefira Davison, Sergei Lebedev, Yihe Xu, Sally Gibson, Chiara Civiero, Javier Fullea   +5 more
wiley   +1 more source

Southern Urals lamproites: the problems of terminology, age, and geodynamic interpretation

Литосфера, 2017
We have studied mineral and chemical composition of lamproites from Kalymbaevsky Complex the Middle Trias. These lamproites were developed in Magnitogorsk and Eastern-Urals megazones of the Southern Urals.
S. V. Pribavkin
doaj   +2 more sources

Petrogenesis of lavas from Detroit Seamount: Geochemical differences between Emperor Chain and Hawaiian volcanoes [PDF]

, 2005
The Hawaiian Ridge and Emperor Seamount Chain define a hot spot track that provides an 80 Myr record of Hawaiian magmatism. Detroit Seamount (∼76 to 81 Ma) is one of the oldest Emperor Seamounts.
Abouchami, Adam, Albarede, Bach, Barrett, Basaltic Volcanism Study Project, Bass, Blichert-Toft, Blundy, Blundy, Caplan-Auerbach, Carmichael, Castillo, Castillo, Castillo, Castillo, Castillo, Chen, Clague, Class, Cottrell, Dalrymple, Duncan, Eisele, F. A. Frey, Fekiacova, Foley, Foley, Fornari, Frey, Frey, Frey, Frey, Frey, Frey, Galer, Garcia, Garcia, Garcia, Green, Haase, Hanan, Hart, Hickey-Vargas, Hofmann, Hofmann, Hofmann, Hofmann, Huang, Huang, Irving, Janney, Keller, Keller, Kempton, Kinman, Kinzler, Kirkpatrick, Langmuir, Lanphere, Lassiter, Lassiter, Lassiter, LaTourrette, Li, Lipman, Longerich, Longhi, Lonsdale, Lonsdale, M. Regelous, Macdonald, Mammerickx, Mengel, Moore, Mueller, Niu, Niu, Niu, Norman, Parsons, Putirka, Rea, Regelous, Regelous, Rhodes, Rhodes, Ribe, Roden, Roden, S. Huang, Schmidt, Schmitz, Sharp, Sinton, Sisson, Sleep, Sobolev, Staudigel, Stein, Stille, Stolper, Sturm, Sun, T. Thordarson, Tarduno, Tatsumoto, Thompson, van Westrenen, Villemant, Walter, Wendt, White, Wilson, Yang, Yang   +115 more
core   +1 more source

A Lithospheric Drip Triggered Green and Colorado River Integration

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 2, February 2026.
Abstract The integration of the Green and Colorado Rivers shifted the continental drainage divide of North America, marking a key event in the hydrological and biogeographical evolution of the continent. Sedimentological and stratigraphic evidence shows that for integration to occur, the Green River likely cut through the Uinta Mountains between 8 and ...
Adam G. G. Smith, Matthew Fox, Scott R. Miller, Matthew C. Morriss, Leif S. Anderson   +4 more
wiley   +1 more source

Some notes on the IUGS classification of lamprophyric rocks

Mineralogia
The lamprophyric rocks are uncommon volatile-rich melanocratic porphyritic rocks which contain only mafic phenocrysts. The felsic minerals are confined in the groundmass. They occur as dikes, sills and diatremes.
Kamvisis Ioannis, Phani Pothuri Ramesh Chandra   +1 more
doaj   +1 more source

Platinum-group element contents of Karelian kimberlites: implications for the PGE budget of the sub-continental lithospheric mantle [PDF]

, 2017
We present high-precision isotope dilution data for Os, Ir, Ru, Pt, Pd and Re in Group I and Group II kimberlites from the Karelian craton, as well as 2 samples of the Premier Group I kimberlite pipe from the Kaapvaal craton. The samples have, on average,
Barnes, Sarah-Jane, Maier, W.D., O'Brien, H., Peltonen, P.   +3 more
core   +2 more sources

Raising the Roof of the World: Intra‐Crustal Asian Mantle Supports the Himalayan‐Tibetan Orogen

Tectonics, Volume 44, Issue 9, September 2025.
Abstract The Himalayan‐Tibetan orogen formed via the ongoing collision of India and Asia. Its colossal elevations stem from buoyant crustal roots that doubled in thickness during continental collision, widely believed to result from Indian crust under‐thrusting its Asian counterpart and Asian crustal thickening. However, a single crustal layer of up to
P. Sternai, S. Pilia, S. Ghelichkhan, P. Bouilhol, A. Menant, D. R. Davies, L. Ostorero, B. Vaes, R. Esposito, E. Garzanti, S. Cloetingh, T. Gerya   +11 more
wiley   +1 more source

A FIRST REPORT ON THE ROLE OF TRACE ELEMENT PEDOGEOCHEMISTRY IN DIAMOND EXPLORATION- AN EXAMPLE FROM LATTAVARAM KIMBERLITE CLUSTER, SOUTHERN INDIA

Geochimica Brasiliensis, 2018
Trends in a concentration of selected trace elements in residual soils on four known diamondiferous kimberlite pipes (3, 4, 8 and 9) occurring at Lattavaram within the Wajrakarur Kimberlite Field (WKF) is attempted for the first time.
Rameshchandra Phani Pothuri
doaj   +1 more source

Pb and Hf isotope evidence for mantle enrichment processes and melt interactions in the lower crust and lithospheric mantle in Miocene orogenic volcanic rocks from Monte Arcuentu (Sardinia, Italy) [PDF]

, 2018
Miocene (ca. 18 Ma) subduction-related basalts and basaltic andesites from Monte Arcuentu, southern Sardinia, Italy, show a remarkable correlation between 87Sr/86Sr (from ~0.705 to ~0.711) over a small range of SiO2 (~51–58 wt%) that contrasts with most ...
Downes, Hilary, Kempton, P.D., Lustrino, M.   +2 more
core   +2 more sources