Results 31 to 40 of about 14,415 (244)
On the location of plumes and lateral movement of thermochemical structures with high bulk modulus in the 3-D compressible mantle [PDF]
, 2011 The two large low shear velocity provinces (LLSVPs) at the base of the lower mantle are prominent features in all shear wave tomography models. Various lines of evidence suggest that the LLSVPs are thermochemical and are stable on the order of hundreds ...
Gurnis, Michael +3 more
core +1 more source
The transition zone as a host for recycled volatiles: Evidence from nitrogen and carbon isotopes in ultra-deep diamonds from Monastery and Jagersfontein (South Africa) [PDF]
, 2017 Sublithospheric (ultra-deep) diamonds provide a unique window into the deepest parts of Earth's mantle, which otherwise remain inaccessible. Here, we report the first combined C- and N-isotopic data for diamonds from the Monastery and Jagersfontein ...
Gurney, J.J. +6 more
core +1 more source
Геодинамика и тектонофизика, 2016 The paper presents the results of comprehensive study of the primary diamond deposit of the Nyurbinskaya pipe in the Yakutian diamondiferous province. It is established, that the pipe is confined to the fault junction of four directions and is composed ...
A. S. Gladkov +6 more
doaj +1 more source
Brazilian Journal of Geology, 2020 Oxygen fugacity (ƒO2) conditions were established for Três Ranchos IV (TR-IV, diamond-bearing) and Limeira I (LM-I, barren) kimberlite intrusions, in Alto Paranaíba Alkaline Province, to constrain a possible correlation between fO2 and diamond ...
Bruna Coldebella +4 more
doaj +1 more source
Styles of Alteration of Ti Oxides of the Kimberlite Groundmass: Implications on the Petrogenesis and Classification of Kimberlites and Similar Rocks [PDF]
, 2018 The sequence of replacement in groundmass perovskite and spinel from SK-1 and SK-2 kimberlites (Eastern Dharwar craton, India) has been established. Two types of perovskite occur in the studied Indian kimberlites.
Castillo Oliver, Montgarri +2 more
core +2 more sources
Известия высших учебных заведений: Геология и разведка, 2019 The new data on the composition of kimberlite indicator minerals (KIM) — pyropes and picroilmenites — of the first kimberlite body T-54-14, opened in 2015 in the Syuldyukar kimberlite field by the geologists of ALROSA PJSC, during the verification of the
T. S. Starkova +2 more
doaj +1 more source
Геодинамика и тектонофизика, 2015 The publication is devoted to the role of Mikhail M. Odintsov, Corresponding Member of the USSR Academy of Sciences, and his scientific school in solution of fundamental problems related to regularities of occurrence of endogenic mineral resources at ...
Konstantin N. Egorov
doaj +1 more source
The origin of kimberlite [PDF]
, 1980 A new diapiric model for kimberlite genesis takes into account recent interpretations of peridotite-CO_2-H_2O melting relationships. A minor thermal perturbation at depth might trigger release of reduced vapors with major components C-H-O.
Wyllie, Peter J.
core +1 more source
Геодинамика и тектонофизикаThe paper presents the results of studies of daughter olivine within secondary melt inclusions marking healed cracks in olivine macrocrysts from unserpentinized kimberlite from the Udachnaya-East pipe.
A. A. Tarasov, A. V. Golovin
doaj +1 more source
The lithospheric mantle and lower crust-mantle relationships under Scotland: a xenolithic perspective [PDF]
, 2011 In the British Isles the majority of volcanic rocks containing upper mantle and lower crustal xenoliths occur in Scotland. Most of the occurrences are of Carboniferous–Permian age.
Arai +17 more
core +1 more source