Results 41 to 50 of about 518 (163)

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

Evolution of the Source Mineralogy and Lithospheric Controls on Magmatism During the Northeast Atlantic Continental Breakup

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract The mid‐Norwegian Margin, part of the North Atlantic Igneous Province (NAIP), is a well‐studied volcanic rifted margin formed during the breakup between Greenland and Eurasia ∼56 Ma, with the largest accumulation of magmatic material hosted by the Vøring Margin section.
Emily H. Cunningham, Sarah Lambart, Pengyuan Guo, Sayantani Chatterjee, Christian Tegner, Autumn Hartley, Ashley M. Morris, Sverre Planke, Christian Berndt, Carlos A. Alvarez Zarikian, Peter Betlem, Henk Brinkhuis, Marialena Christopoulou, Eric C. Ferré, Irina Y. Filina, Joost Frieling, Dustin T. Harper, Morgan T. Jones, Jack Longman, John M. Millett, Geoffroy T. F. Mohn, Reed P. Scherer, Natalia Varela, Weimu Xu, Stacy L. Yager   +24 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

Lamproite-hosted diamond

, 1995
B A Kjarsgaard
openaire   +2 more sources

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

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

Age and origin of proterozoic kimberlites and lamproites from the Dharwar Craton, southern India [PDF]

, 2012
This is a study of kimberlite and lamproite intrusions located in southern India within the Eastern Dharwar craton (EDC). Bulk-rock major-element, trace-element, REE- and Nd- isotopic data support previous studies that have classified the ultramafic ...
Osborne, Ian
core   +1 more source

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

Diamondiferous lamproites of Ingashi field, Siberian craton

, 2021
Supplementary Fig. S4. Composition of clinopyroxene xenocrysts from dyke 4 lamproite on Cr2O3–Al2O3 diagram from (Ramsey and Tompkins 1994)
T. V. Donskaya (11059496), A. P. Sekerin (11059505), D. A. Yakovlev (8100167), I. S. Sharygin (11059490), S. I. Kostrovitsky (2845673), V. G. Malkovets (11059508), D. P. Gladkochub (11059493), I. G. Tretiakova (11059499), A. M. Dymshits (11059502)   +8 more
core   +1 more source

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

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract 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 shallow subduction in the Oligocene.
C. D. Hiett, D. L. Newell, J. W. Shervais   +2 more
wiley   +1 more source