Results 51 to 60 of about 6,814 (200)

Olivine in the Udachnaya-East kimberlite (Yakutia, Russia): types, compositions and origins [PDF]

, 2007
Olivine is the principal mineral of kimberlite magmas, and is the main contributor to the ultramafic composition of kimberlite rocks. Olivine is partly or completely altered in common kimberlites, and thus unavailable for studies of origin and evolution ...
Demouchy, S, Faure, K, Golovin, AV, Kamenetsky, MB, Kamenetsky, VS, Kuzmin, DV, Sharygin, VV, Sobolev, AV   +7 more
core   +3 more sources

Conditions of localization and criteria for kimberlites exploration (on the example of Igyatta diamondiferous region, Western Yakutia)

Известия высших учебных заведений: Геология и разведка, 2019
The main source of mined diamonds in Russia is the Yakutia diamond-bearing province (YAP). To date, all open areas within the prospective Vilyuy-Markha deep fault zone (VMZ) of the YAP, which is a mineragenetic and which hosted diamond deposits of Mir ...
M. V. Maltsev, A. V. Tolstov, I. I. Berezhnev   +2 more
doaj   +1 more source

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

Komatiites, kimberlites, and boninites [PDF]

Journal of Geophysical Research: Solid Earth, 2003
When the mantle melts, it produces ultramafic magma if the site of melting is unusually deep, the degree of melting is unusually high, or the source is refractory. For such melting to happen, the source must be unusually hot or very rich in volatiles. Differing conditions produce a spectrum of ultramafic magma types.
openaire   +3 more sources

DISTRIBUTION OF TRACE ELEMENTS IN PEROVSKITE FROM SKARNS AND CALCITE VEINS OF THE CHERNAYA RECHKA AND NAZYAM RIDGES (SOUTH URALS) [PDF]

Минералогия, 2017
Trace element distribution and crystal morphology of perovskite from garnet-vesuvianite skarn of the Akhmatovskaya mine and chlorite-perovskite-calcite veins of the Perovskitovaya mine (South Urals) were studied using LA-ICP-MS.
S.Yu. Stepanov, L.N. Sharpenok, R.S. Palamarchuk, A.I. Glazov   +3 more
doaj  

Combustion and Pyrolysis EA‐IRMS Techniques to Determine the δ2H of Diamonds

Rapid Communications in Mass Spectrometry, Volume 40, Issue 10, 30 May 2026.
ABSTRACT Rationale Diamonds are generally considered to be metasomatic minerals originating from the Earth's mantle. They formed through the interaction of carbon‐bearing fluids or melts with the surrounding deep lithology. Most knowledge about the formation of diamonds comes from studying their mineral inclusions or stable isotopes.
François Fourel, Christophe Lécuyer, Emilie Thomassot, Etienne Deloule, Charles Ojeimi   +4 more
wiley   +1 more source

Specific features of clay minerals in ancient crusts of weathering of various rocks in diamondiferous regions

Мінеральні ресурси України, 2019
Results of complex research of different age ancient weathering crusts in various rocks (terrigenous-carbonate rocks of Lower Paleozoic, dolerites, tuffs and tufogene formations, kimberlites) within the main diamondiferous regions of the Siberian ...
M. M. Zinchuk
doaj   +1 more source

Global Comparison of Aqueous Geochemistry and Dissolved H2/CH4 in Continental Low Temperature Serpentinization–Influenced Environments

Hydrological Processes, Volume 40, Issue 3, March 2026.
Conceptual diagram of hydrological and geochemical processes within the Santa Elena Ophiolite, Costa Rica. It highlights watershed cross‐sections, soil genesis, hyperalkaline Type II waters (pH > 11.6) with calcite crust and trapped H2/CH4 gases, seepage into surface waters, storm‐impacted stream profiles, weathered vs.
Alexandra May, Ricardo Sánchez‐Murillo, Matthew O. Schrenk, Esteban Gazel, J. Maarten de Moor, Christian Birkel, Xiaoqiang Li, Danelle Carr, María Marta Chavarría   +8 more
wiley   +1 more source

Lithospheric Delamination Below the North American Midcontinent Ceased Subsidence in Cratonic Basins

AGU Advances, Volume 7, Issue 1, February 2026.
Abstract Cratonic lithospheres carry a long history of tectonic modifications that result in heterogeneous structures, as revealed by an increasing number of geophysical observations. The existence of cratonic basins indicates protracted periods of tectonic modification, causing subsidence within global continental interiors.
Xiaotao Yang, Lihang Peng, Andrea Stevens Goddard, Lijun Liu   +3 more
wiley   +1 more source

ガーナ, ビルム・ダイヤモンド産地のアクァティア地域に分布する沖積層の重鉱物分析 [PDF]

, 2005
Heavy mineral analysis was carried out on Pliocene to Recent alluvial sediments from the Birim diamondiferous field od Ghana. The main objective of the study was to examine the mineral composition of heavy fractions in order to identify : (1) the heavy ...
Bruce, Banoeng-yakubo, Daniel, Asiedu, Samuel, Dampare, Shibata, Tsugio   +3 more
core   +1 more source