Results 41 to 50 of about 3,348 (162)

Induced polarization of volcanic rocks. Part 7. Kimberlites

, 2023
International audienceIn the field, kimberlites are characterized by high electrical conductivities (about 0.1 S m-1) compared to most igneous rocks. The reason for these high conductivities has not been fully elucidated to date.
Abramov, V, Titov, K, Revil, André, Emelianov, V   +3 more
core   +1 more source

Hf isotope systematics of Kimberlites and their megacrysts: new constraints on their source regions

, 2004
Kimberlites from Southern Africa, along with their low-Cr mega-crysts, have unusual Hf–Nd isotopic characteristics. Group I and Transitional kimberlites define arrays trending oblique to, and well below, the Nd–Hf isotope ‘mantle array’, defined by ...
D. R. Bell, C. B. Smith, S. R. Noble, Carlson, R.W, Pearson, D.G, P. D. Kempton, D. G. Pearson, Bell, D.R, Smith, C.B, Kempton, P.D, R. W. Carlson, Nowell, G.M, G. M. Nowell, Noble, S.R   +13 more
core   +1 more source

Preliminary report on exploration for diamondiferous kimberlites, Colorado – Wyoming

, 1979
Preliminary report on exploration for diamondiferous kimberlites, Colorado ...
W.D. Hausel (10069834), T.L. Woodzick (10075042), M.E. McCallum (10073338)   +2 more
core   +1 more source

Investigating Layered Cratonic Lithosphere in the Fennoscandian Shield

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract Cold, thick, and chemically depleted lithosphere with high seismic velocity and low attenuation characterizes continental cratons. However, discrepancies between xenolith‐based thermal constraints and those inferred from surface‐wave seismic models, together with the widespread observation of mid‐lithosphere discontinuities, challenge the ...
Yiran Huang, Colleen A. Dalton, Karen M. Fischer   +2 more
wiley   +1 more source

Elemental and isotopic geochemistry of kimberlites from the Lac de Gras field, northwest territories, Canada. [PDF]

, 2004
Detailed major/trace element and high-precision Hf-Nd-Sr isotope data has been acquired for 86 samples of kimberlites from the recently discovered Lac de Gras kimberlite field in the Northwest Territories, Canada, plus 23 samples from other Canadian ...
Dowall, David Phillip
core   +4 more sources

Application of IR Fourier microscopy for investigation of kimberlite indicator minerals to search for diamond deposits using heavy-mineral concentrate method

Руды и металлы
Possibilities of the infrared microscopy technique as applied to the express diagnostics of diamond crystals and of grains of most of its satellite minerals, extracted from heavy mineral concentrate (HMC) samples, are considered. An original technique of
Khachatryan G. K., Anashkina N. E.
doaj   +1 more source

Linking Tectonics and Cratonic Vertical Motions: Deep‐Time Thermochronology Reveals >1,000 Myr of Low‐Temperature Conditions in Southeastern Finland

Tectonics, Volume 45, Issue 9, September 2026.
Abstract The Fennoscandian Shield potentially hosts the longest continuous habitable conditions for Earth's deep biosphere. Billion‐year equilibrium freeboard conditions of cratons and the longevity of deep biosphere microbial communities are directly related through the thermal histories of rocks that host these communities.
Josh Isaacs, William Guenthner, Henrik Drake, C. Brenhin Keller, Kalin T. McDannell   +4 more
wiley   +1 more source

AP, 2004. Petrogenesis of Proterozoic lamproites and kimberlites from Cuddapah Basin and Dharwar Craton, southern India

, 2004
Proterozoic mafic potassic and ultrapotassic igneous rocks emplaced in the Cuddapah Basin and Dharwar Craton of the southern Indian shield are among the earliest recorded on Earth.
Gibson, S. A., Chalapathi Rao, N. V., Pyle, D. M., Dickin, A. P.   +3 more
core   +3 more sources

Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots

Communications Earth & Environment, 2022
Reactions of depleted, reduced peridotite with oxidised volatile-rich melts can explain several contentious rock assemblages sampled by kimberlites from the metasomatised zone at the base of the lithosphere, according to high pressure laboratory ...
Zsanett Pintér, Stephen F. Foley, Gregory M. Yaxley   +2 more
doaj   +1 more source

Corundum Discovered by SuperCam and the Perseverance Rover at Jezero Crater, Mars

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Mars is primarily composed of mafic mineral assemblages and their alteration products, but small, scattered rocks strewn across the landscape offer clues to greater petrological diversity. While traversing the Jezero crater rim, the Perseverance rover encountered several plagioclase‐rich light‐toned float rocks.
A. M. Ollila, O. Beyssac, A. Fau, O. Forni, E. Clavé, P. Beck, C. C. Bedford, V. Payre, E. Dehouck, S. A. Connell, J. A. Manrique, P. Pilleri, O. Gasnault, G. M. Martinez, A. Udry, S. Bernard, P. Gasda, T. Acosta‐Maeda, R. B. Anderson, T. S. J. Gabriel, F. Calef, J. F. Bell III, J. Maki, S. Schröder, C. Quantin‐Nataf, J. R. Johnson, B. Chide, K. Rammelkamp, F. Poulet, C. Royer, M. Rock, N. L. Lanza, S. K. Sharma, G. Lopez‐Reyes, T. Fouchet, J. Comellas, A. Zastrow, E. Cloutis, R. C. Wiens, A. Cousin, S. Maurice, S. Clegg, P. Bernardi, T. Nelson   +43 more
wiley   +1 more source