Results 51 to 60 of about 191 (177)

PGM in chromitites of Kraka massifs (the Southern Urals): diversity and origin

Georesursy
The paper provides results of study of platinum group minerals (PGMs) from 18 ore occurrences and deposits of the Kraka massifs, most of these located in ultramafic rocks of the upper mantle section (15), and several occurrences in a crust-mantle ...
D. E. Saveliev
doaj   +1 more source

Petrological Evolution of the Upper Mantle Beneath the Southern Sanandaj-Sirjan Zone: Evidence from Kuhshah Peridotite Massif, Southeast Iran [PDF]

Journal of Sciences, Islamic Republic of Iran, 2014
The Kuhshah ultramafic complex is located in the south-east of Sanandaj-Sirjan metamorphic zone, near the probable remnants of Neotethys plate in Iran. It consists of highly depleted harzburgites, dunites, chromitite bands and altered gabbros.
H. Ahmadipour
doaj  

Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland

Geosciences, 2018
Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss.
Juan Miguel Guotana, Tomoaki Morishita, Ryoko Yamaguchi, Ikuya Nishio, Akihiro Tamura, Kenichiro Tani, Yumiko Harigane, Kristoffer Szilas, D. Graham Pearson   +8 more
doaj   +1 more source

Mineral chemistry and chromite mineralization in the Qaranaz-Alamkandi area, west Zanjan

Journal of Economic Geology, 2021
Introduction Malek Ghasemi and Karimzadeh Somarin (2005) reported that Chromite deposits in Iran occur in Paleozoic and Mesozoic ophiolite complexes in association with serpentinite and serpentinized peridotites and dunites (Ghazi et al., 2004; Shafaii ...
Parham Ahrabian Fard, Ghasem Nabatian, Mir Ali Asghar Mokhtari , Maryam Honarmand , Hossein Kouhestani   +4 more
doaj   +1 more source

RocMLMs: Predicting Rock Properties Through Machine Learning Models

Journal of Geophysical Research: Machine Learning and Computation, Volume 1, Issue 4, December 2024.
Abstract Mineral phase transformations significantly alter the bulk density and elastic properties of mantle rocks and consequently have profound effects on mantle dynamics and seismic wave propagation. These changes in the physical properties of mantle rocks result from evolution in the equilibrium mineralogical composition, which can be predicted by ...
Buchanan Kerswell, Nestor G. Cerpa, Andréa Tommasi, Marguerite Godard, José Alberto Padrón‐Navarta   +4 more
wiley   +1 more source

Tibetan chromitites: Excavating the slab graveyard

Geology, 2015
Podiform chromitites enclosed in depleted harzburgites of the Luobusa massif (southeastern Tibet) contain diamond and a highly reduced trace-mineral association. Exsolution of diopside and coesite from chromite suggests inversion from the Ca-ferrite structure in the upper part of the mantle transition zone (>400 km).
McGowan, Nicole, Griffin, William, González Jiménez, José, Belousova, Elena, Afonso, Juan Carlos, Shi, Rendeng, McCammon, Catherine, Pearson, Norman, O'Reilly, Suzanne Y.   +8 more
openaire   +4 more sources

Integration of ground geophysical methods to characterize near‐surface aquifer zones within an active mine

Near Surface Geophysics, Volume 22, Issue 5, Page 521-538, October 2024.
Abstract Understanding near‐surface groundwater storage, flow patterns, surface and groundwater interactions in mining areas can assist in making mining more efficient and profitable. This is especially important in opencast mines affected by water inflows that may negatively affect production and increase mining costs. We map and characterize the near‐
Sikelela Gomo, Ndamulelo Mutshafa, Jureya Dildar, Musa S. D. Manzi, Julie E. Bourdeau, Bojan Brodic, Ian James, Gordon R. J. Cooper, Raymond J. Durrheim   +8 more
wiley   +1 more source

Chromitites of the Akkarginskiy massif (the Southern Urals)

Вестник Пермского университета. Геология, 2018
We consider the geological features of ultramafic rock and chrome ore deposits. It is shown that all studied deposits are podiform in morphology that is typical for the ophiolite ultramafic rocks. Morphological and chemical features of the accessory and oreforming spinels are described.
D. E. Saveliev, I. I. Musabirov
openaire   +3 more sources

Genesis of podiform chromitites – a review of models

NEWS of the Ural State Mining University, 2020
Relevance of the work. Research aimed at identification of genesis of chromium ores in alpine-type hyperbasites has been conducted by scientists (geologists, petrologists and geochemists) around the world for more than a century. Nevertheless, the issue of their origin remains debatable to this day.
Pavel Borisovich SHIRYAEV, Nadezhda Vladimirovna VAKHRUSHEVA   +1 more
openaire   +1 more source

Seismic imaging of the complex geological structures in the southwestern edge of the Western limb, Bushveld Complex through focusing pre‐stack depth migration of legacy 2D seismic data

Geophysical Prospecting, Volume 72, Issue 7, Page 2504-2519, September 2024.
Abstract We reprocessed a 50‐km long legacy 2D reflection seismic profile acquired in 1986, under a project funded by the National Geophysics Program to improve the delineation of complex geological structures that host the platinum‐bearing horizons (known as the UG2 reef; a chromitite horizon) on the south‐eastern edge of the Western limb of the ...
Mpofana Sihoyiya, Felix Hloušek, Musa S. D. Manzi, Moyagabo K. Rapetsoa, Stefan Buske, David Khoza   +5 more
wiley   +1 more source