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Zeitschriftenartikel zum Thema „Duniter“

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Veröffentlicht am 25. Mai 2024

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1

Bazylev, B. A., G. V. Ledneva, Ya V. Bychkova, N. N. Kononkova, T. G. Kuz’mina, and T. V. Romashova. "Estimation of the content and composition of trapped melt in dunite." Геохимия 64, no. 5 (2019): 471–85. http://dx.doi.org/10.31857/s0016-7525645471-485.

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A method was developed for the quantitative estimation of the content of trapped melt in various dunite types and the composition of this melt on the basis of the major- and trace-element characteristics of the dunites and compositions of their chrome spinels. Our approach is advantageous over the method based on clinopyroxene geochemistry and clinopyroxene–melt partition coefficients for the contents of the light REE and more incompatible elements in melt, comparable with it for the middle REE, and possibly less accurate for the heavy REE and Sr. The estimated mean contents of trapped melt in

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2

Malafosse, Maxime, Amandine Pascal, and Serge Amabile. "Commoning with blockchain. The Ğ1 libre currency/Duniter case." Systèmes d'information & management Volume 27, no. 2 (2022): 7–34. http://dx.doi.org/10.3917/sim.222.0007.

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3

Çina, A. "MINERALOGY OF CHROMITITE, BULQIZA ULTRAMAFIC MASSIF, ALBANIAN OPHIOLITIC COMPLEX." Bulletin of the Geological Society of Greece 43, no. 5 (2017): 2577. http://dx.doi.org/10.12681/bgsg.11665.

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Ultramafic massif of Bulqiza belongs to Eastern Jurassic Albanian ophiolite belt of IAT-BSV- type. This massif is the most important chromite-bearing ore. The mantle ultramafics have extremely refractory nature. This is due to the high partial fusion of upper mantle which is depleted in CaO and Al2 O3 . The chromitite is situated to different parts of ultramafic pile, from bottom Cpx harzburgites up to massive dunites and cumulate ultramafic but the mainly chromite potential belongs to mantle harzburgite –dunite level and to transition dunites partly. The chromite is chiefly of Cr-rich metallu

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4

Akizawa, Norikatsu, Asuka Yamaguchi, Kenichiro Tani, Akira Ishikawa, Ryo Fujita, and Sung Hi Choi. "Highly refractory dunite formation at Gibbs Island and Bruce Bank, and its role in the evolution of the circum-Antarctic continent." Canadian Mineralogist 59, no. 6 (2021): 1731–53. http://dx.doi.org/10.3749/canmin.2100030.

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ABSTRACT The continental margin is of profound importance as it records continental growth by accretion of orogenic magmas and following continental rifting. A high degree of mantle melting due to hydrous fluid input is expected to simultaneously stimulate continental growth and lower the intrinsic density of the mantle than more fertile mantle, which in turn isolates the continental lithosphere from the convective mantle. The mantle peridotites from Gibbs Island (South Shetland Islands) and Bruce Bank in the Drake Passage provide us an insight into the tectonic history in the circum-Antarctic

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5

Motov, Andrey, Yury Malakh, and Ilya Voropaev. "Nickel anomalies and gold-quartz mineralization in dunite-harzburgite massifs of the Pervomaisko-Verkhoturinskaya area, Central Urals." Ores and metals, no. 2 (August 16, 2021): 90–98. http://dx.doi.org/10.47765/0869-5997-2021-10012.

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Along with some gold-quartz deposits hosted by dunite-harzburgite massifs elsewhere in the Urals, elevated Ni concentrations were revealed within the ore field of the Anna gold-(sulfide)-quartz deposit localized in weathered oxidized dunites and harzburgites of the Pervomaisky complex (συO2p) in the Pervomaisko-Verkhoturie district of the Central Urals. The spatial association of Au and Ni concentrations in dunites-harzburgites may be attributed to a partial inheritance of Ni-controlling tectonic dislocations by those hosting gold mineralization. Therefore, the combination of halos of Ni and A

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6

Ishimaru, S., and S. Arai. "Possibility of titanium transportation within a mantle wedge: formation process of titanoclinohumite in Fujiwara dunite in Sanbagawa belt, Japan." Solid Earth Discussions 4, no. 1 (2012): 203–39. http://dx.doi.org/10.5194/sed-4-203-2012.

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Abstract. Titinoclinohumite-bearing dunites from Fujiwara, the Sanbagawa metamorphic belt of high-pressure type, Japan, were described to examine the possibility of Ti mobility during metasomatism within the mantle wedge. The Fujiwara dunite body and surrounding high-pressure Sanbagawa schists possibly form a subduction complex, and the dunites are a good analogue to the mantle wedge overlying the slab. The Fujiwara dunites are of deserpentinization origin; the deserpentinized olivine is high in Fo (up to 96) and low in NiO (0.2 to 0.3 wt %), and contains magnetite inclusions. Titanoclinohumit

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7

Stepanov, S. Yu, R. S. Palamarchuk, D. A. Khanin, D. A. Varlamov, and A. V. Antonov. "Character of the distribution and the form of finding platinum group elements in the chromitites of the Svetloborsky, Veresovoborsky and Kamenushensky clinopyroxenite-dunite intrusions (Middle Urals)." Moscow University Bulletin. Series 4. Geology, no. 5 (October 28, 2018): 60–69. http://dx.doi.org/10.33623/0579-9406-2018-5-60-69.

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The note describes the mineralogical and geochemical features of platinum-bearing vein-disseminated and massive chromitite from the dunites of the Svetloborsky, Veresovoborsky and Kamenushensky clinopyroxenite-dunite intrusions located in the Middle Urals. It was found that platinum in chromitites has an extremely uneven distribution and is concentrated in the form of Pt-Fe intermetallides. The texture-structural features of the chromitites studied, the distribution of platinum group elements and the composition of chromoshpinelides in them are similar to the detailed study of the chromitites

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8

Krasnobaev, A. A., P. M. Valizer, and A. L. Perchuk. "ORDOVICIAN AGE OF DUNITE-WEHRLITE-CLINOPYROXENITE BENDED COMPLEX OF NURALI MASSIF (SOUTHERN URALS, RUSSIA): SHRIMP U-PB ZIRCON DATING." Moscow University Bulletin. Series 4. Geology, no. 1 (February 28, 2018): 60–70. http://dx.doi.org/10.33623/0579-9406-2018-1-60-70.

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We present the data of geochemistry and geochronology of zircons from wehrlites and clinopyroxenites from dunite-wehrlite-clinopyroxenite bended complex of the base of crustal section of ophiolite Nurali massif. The U-Pb age of the bended complex is 450±4 Ma which is different from the previous data. Zircons from the studied rocks have complimentary REE patterns and similar U-Pb ages to lherzolites and dunites from mantle section of the Nurali massif.

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9

Kuzmin, I. A., R. S. Palamarchuk, V. M. Kalugin, A. V. Kozlov, and D. A. Varlamov. "Chromite-platinum mineralization of clinopyroxenite-dunite massif Zheltaya Sopka, North Ural." МИНЕРАЛОГИЯ (MINERALOGY), no. 3 (December 2020): 46–59. http://dx.doi.org/10.35597/2313-545x-2020-6-4-3.

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The paper presents the new data on platinum group minerals (PGM) and chromite from the Zheltaya Sopka massif, North Urals. Few chromite bodies along with specifc composition of chromite indicate weak ore-forming processes developed in this massif. Minakawaite (RhSb) and chengdeite (Ir3Fe) are found for the frst time in the Uralian Platinum Belt. The PGM assemblage of the Zheltaya Sopka massif is compared with that of the Iov, Yuda, and Sosnovsky dunite massifs of the northern part of the Uralian Platinum Belt. As a result, similar PGM assemblages with domi¬nant minerals of late assemblages are

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10

Yang, Sai-Hong, Ben-Xun Su, Xiao-Wen Huang, et al. "Platinum-Group Mineral Occurrences and Platinum-Group Elemental Geochemistry of the Xiadong Alaskan-Type Complex in the Southern Central Asian Orogenic Belt." Minerals 8, no. 11 (2018): 494. http://dx.doi.org/10.3390/min8110494.

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Alaskan-type complexes commonly contain primary platinum-group element (PGE) alloys and lack base-metal sulfides in their dunite and chromite-bearing rocks. They could therefore host PGE deposits with rare sulfide mineralization. A detailed scanning electron microscope investigation on dunites from the Xiadong Alaskan-type complex in the southern Central Asian Orogenic Belt revealed: various occurrences of platinum-group minerals (PGMs) that are dominated by inclusions in chromite grains containing abundant Ru, Os, S and a small amount of Pd and Te, indicating that they mainly formed prior to

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11

Cocomazzi, Grieco, Tartarotti, et al. "The Formation of Dunite Channels within Harzburgite in the Wadi Tayin Massif, Oman Ophiolite: Insights from Compositional Variability of Cr-Spinel and Olivine in Holes BA1B and BA3A, Oman Drilling Project." Minerals 10, no. 2 (2020): 167. http://dx.doi.org/10.3390/min10020167.

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Holes BA1B and BA3A were drilled into the Wadi Tayin Massif, southern ophiolite complex of Oman, a fragment of the Tethyan oceanic lithosphere obducted onto the Arabian continent. Within the sequence, we have studied a portion of the shallow mantle, composed mainly of strongly serpentinised harzburgite that embeds dunitic levels, the biggest being over 150 m thick. The formation of thick dunitic channels, already approached via published structural and mathematical models, is here investigated with a mineral chemistry approach. We focused on Cr-spinel, the only widespread phase preserved durin

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12

Ashchepkov, Igor, Nikolay Medvedev, Nikolay Vladykin, Alexander Ivanov, and Hilary Downes. "Thermobarometry and Geochemistry of Mantle Xenoliths from Zapolyarnaya Pipe, Upper Muna Field, Yakutia: Implications for Mantle Layering, Interaction with Plume Melts and Diamond Grade." Minerals 10, no. 9 (2020): 755. http://dx.doi.org/10.3390/min10090755.

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Minerals from mantle xenoliths in the Zapolyarnaya pipe in the Upper Muna field, Russia and from mineral separates from other large diamondiferous kimberlite pipes in this field (Deimos, Novinka and Komsomolskaya-Magnitnaya) were studied with EPMA and LA-ICP-MS. All pipes contain very high proportions of sub-calcic garnets. Zapolyarnaya contains mainly dunitic xenoliths with veinlets of garnets, phlogopites and Fe-rich pyroxenes similar in composition to those from sheared peridotites. PT estimates for the clinopyroxenes trace the convective inflection of the geotherm (40–45 mW·m−2) to 8 GPa,

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13

Lloyd, F. E., A. D. Edgar, D. M. Forsyth, and R. L. Barnett. "The paragenesis of upper-mantle xenoliths from the Quaternary volcanics south-east of Gees, West Eifel, Germany." Mineralogical Magazine 55, no. 378 (1991): 95–112. http://dx.doi.org/10.1180/minmag.1991.055.378.08.

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AbstractGroup I xenoliths, orthopyroxene-rich and orthopyroxene-free, contain Cr-spinel and clinopyroxene ± phlogopite, and occur together with Group II clinopyroxenites ± Ti-spinel ± phlogopite in K-mafic pyroclastics southeast of Gees. The petrography and clinopyroxene chemistry of orthopyroxene-rich (opx-rich sub-group) Group I xenoliths is consistent with an ‘original’ harzburgitic mantle that has been transformed to lherzolite by the addition of endiopside. In harzburgites, orthopyroxenes are reacting to diopside + olivine + alkali-silicate melt, and, by inference, the orthopyroxene-free

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14

Edwards, Stephen J. "Boninitic and tholeiitic dykes in the Lewis Hills mantle section of the Bay of Islands ophiolite: implications for magmatism adjacent to a fracture zone in a back-arc spreading environment." Canadian Journal of Earth Sciences 32, no. 12 (1995): 2128–46. http://dx.doi.org/10.1139/e95-166.

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A detailed, integrated field, petrographic, and geochemical study of the Springers Hill area of the Bay of Islands ophiolite exposed in the Lewis Hills was undertaken to explain the anomalously high abundance of veins and dykes of chromitite, orthopyroxenite, and clinopyroxenite, and their associated dunites, hosted by a refractory harzburgite–dunite mixture. A geodynamic situation is presented, which is constrained by previous studies requiring formation of the Springers Hill mantle section at a ridge–fracture zone intersection, and the whole of the Bay of Islands ophiolite within a back-arc

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15

Abbou-Kebir, Khadidja, Shoji Arai, Ahmed Hassan Ahmed, and Georges Ceuleneer. "Spinel-free and spinel-poor dunite veins crosscutting the Wadi Rajmi ophiolite chromitite (northern Oman ophiolite)." Bulletin de la Société Géologique de France 184, no. 3 (2013): 261–66. http://dx.doi.org/10.2113/gssgfbull.184.3.261.

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Abstract Peculiar dunitic veins almost or totally free of spinels crosscut a podiform chromitite ore body in the Wadi Rajmi, northern Oman ophiolite. They probably originated from a komatiitic melt which was oversaturated in Fo≤94 olivines and which evolved to precipitate simultaneously both chromian spinels, with Cr# ranging from 0.6 to 0.8, and Fo91-93 olivines. The absence or the low modal amounts of spinels are possibly governed by a Cr-undersaturation state of the involved melt which crystallized under relatively low cooling rates to generate the spinel-free and the spinel-poor dunites. A

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16

Chayka, Ivan F., Nikolay I. Baykov, Vadim S. Kamenetsky, et al. "Volcano–Plutonic Complex of the Tumrok Range (Eastern Kamchatka): An Example of the Ural-Alaskan Type Intrusion and Related Volcanic Series." Minerals 13, no. 1 (2023): 126. http://dx.doi.org/10.3390/min13010126.

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Zoned plutons, composed of dunites, pyroxenites, and gabbroic rocks, have been referred to as the Ural-Alaskan type complexes (UA-complexes) and occur in numerous paleo-arc settings worldwide. Many of these complexes are source rocks for economic placers of platinum-group metals. Thus, it is important to understand how UA-complexes form and the origin and behavior of platinum-group elements (PGEs). It is widely assumed that the UA-complexes result from differentiation of supra-subduction high-Ca high-Mg sub-alkaline magmas. However, there is a lack of direct evidence for the existence and diff

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17

Antonicelli, Marta, Riccardo Tribuzio, Tong Liu, and Fu-Yuan Wu. "Contaminating melt flow in magmatic peridotites from the lower continental crust (Rocca d'Argimonia sequence, Ivrea–Verbano Zone)." European Journal of Mineralogy 32, no. 6 (2020): 587–612. http://dx.doi.org/10.5194/ejm-32-587-2020.

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Abstract. The lower continental crust section of the Ivrea–Verbano Zone (Italian Alps) was intruded by a ∼ 8 km thick gabbroic–dioritic body (Ivrea Mafic Complex) in the Upper Carboniferous–Lower Permian, in conjunction with the post-collisional transtensional regime related to the Variscan orogeny. In the deepest levels of the Ivrea Mafic Complex, several peridotite–pyroxenite sequences considered of magmatic origin are exposed. We present here a petrological–geochemical investigation of the peridotites from the largest magmatic ultramafic sequence of the Ivrea Mafic Complex, locally called R

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18

Surin, T. N. "Late-devonian sakhara dunite-clinopiroxenite-gabbro complex (East Magnitogorsk zone, South Urals): petrological-mineralogical features and geodynamic setting." МИНЕРАЛОГИЯ (MINERALOGY) 7 (April 2021): 40–53. http://dx.doi.org/10.35597/2313-545x-2021-7-1-3.

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The relevance of the work is caused by necessary regional analysis of magmatic evolution of the East Magnitogorsk belt and refnement of ideas on geodynamics of the South Urals. The geology and petrochemical-mineralogical features of the Sakhara dunite-clinopyroxenite-gabbro complex in the South Urals are characterized in the paper. Its late Frasnian age is substantiated. The composition of olivine, clinopyroxene and chromite in rocks of the complex are determined. The restite nature of dunites is proved. It is shown that rocks of the complex are similar to those of the Urals platinum belt and

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Appel, C. C., P. W. U. Appel, and H. R. Rollinson. "Complex chromite textures reveal the history of an early Archaean layered ultramafic body in West Greenland." Mineralogical Magazine 66, no. 6 (2002): 1029–41. http://dx.doi.org/10.1180/0026461026660075.

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Abstract Massive chromitite, banded chromitite and disseminated chromite grains are found in a ˜3800 Ma layered ultrabasic body in West Greenland. The major part of the ultrabasite is dominated by dunite. In the upper exposed part, harzburgite and sheets of gabbro-anorthosite occur. Chromite grains in dunites, and in massive and banded chromitites are homogeneous, with increasing Fe contents upwards in the intrusion. In harzburgites chromites show unusual and very complex textural relationships, with two generations ofchromites one replacing the other, and both exhibiting exsolution textures.

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Mues-Schumacher, U., J. Keller, V. A. Kononova, and P. J. Suddaby. "Mineral chemistry and geochronology of the potassic alkaline ultramafic Inagli complex, Aldan Shield, eastern Siberia." Mineralogical Magazine 60, no. 402 (1996): 711–30. http://dx.doi.org/10.1180/minmag.1996.060.402.02.

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AbstractThe Inagli complex, one of several Mesozoic intrusive complexes of the Aldan Shield (Siberian Platform), exhibits a concentric structure comprising several alkaline ultramafic rock-types. A central dunite body is surrounded by olivine- and phlogopite-clinopyroxenites forming an inner rim. The outer rim consists of different shonkinitic and malignitic rocks. The K-Ar ages obtained for the whole complex vary around 132 Ma.The dunites and clinopyroxenites are characterized by cumulate textures. With increasing modal abundances of clinopyroxene and subordinate phlogopite, the rocks develop

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21

Bazylev, B. A., M. V. Portnyagin, D. P. Savelyev, G. V. Ledneva, and N. N. Kononkova. "Subduction and Oceanic Magmatism Records in Plutonic Rocks of the Kamchatsky Mys Ophiolite, Eastern Kamchatka." Петрология 31, no. 3 (2023): 300–320. http://dx.doi.org/10.31857/s0869590323030020.

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The paper presents petrographic, mineralogical, and geochemical data on dunites, pyroxenites, peridotites, and gabbroids of the Kamchatsky Mys ophiolite. These data were acquired to distinguish cogenetic assemblages of igneous rocks, gain an insight into their geodynamic settings, and test various criteria of genetic links between the different magmatic rocks of ophiolites. The ultramafic and mafic rocks are shown to belong to two series, which differ in the compositions of the primary minerals, bulk rocks, and estimated trapped melts. The rocks of these series are found out to have been produ

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Rashid, Muhammad Imran, Emad Benhelal, Faezeh Farhang, Michael Stockenhuber, and Eric M. Kennedy. "Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process." Minerals 10, no. 12 (2020): 1091. http://dx.doi.org/10.3390/min10121091.

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The aim of this study was to increase feedstock availability for mineral carbonation. Acid dissolution and carbonic acid dissolution approaches were used to achieve higher Mg extractions from peridotites. Acid dissolution studies of raw dunite, heat-activated dunite, heat-transformed dunite, and twin sister dunite have not been reported in the literature. Heat-activated dunite is more reactive as compared to heat-transformed dunite, raw dunite, and twin sister dunite. The fraction of magnesium extracted from heat-activated dunite was 57% as compared to 18% from heat-transformed dunite, 14% fro

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Serov, Pavel A., Tamara B. Bayanova, Ekaterina N. Steshenko, Evgeniy L. Kunakkuzin, and Elena S. Borisenko. "Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes." Minerals 10, no. 2 (2020): 186. http://dx.doi.org/10.3390/min10020186.

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The article presents new Sm–Nd and U–Pb geochronological data on rocks of the poorly studied Pados-Tundra Cr-bearing complex. It is part of the Notozero mafic–ultramafic complex (western Kola Peninsula) and occurs at the border of the Paleoproterozoic Lapland Granulite Belt and the Archean Belomorian composite terrain. The Pados-Tundra complex hosts two major zones, the Dunite and Orthopyroxenite Blocks. Dunites are associated with four levels of chromite mineralization. Isotope Sm–Nd studies of dunites, harzburgites, and orthopyroxenites from the central part of the complex have been carried

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Mochalov, A. G., N. V. Berdnikov, O. L. Galankina, P. K. Kepezhinskas, Liu Jinlong, and V. O. Krutikova. "MINERALOGY OF PLATINUM GROUP ELEMENTS IN EXPLOSIVE BRECCIAS OF THE POPERECHNOE DEPOSIT (MALYI KHINGAN, RUSSIA)." Tikhookeanskaya Geologiya 42, no. 2 (2023): 88–104. http://dx.doi.org/10.30911/0207-4028-2023-42-2-88-104.

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The results of detailed study of the platinum-group minerals (PGM) from explosive breccias of the Poperechnoe Fe-Mn deposit (the Lesser Khingan Range, Russian Far East) are presented. Native PGMs are dominated by isoferroplatinum; rutheniridosmine, native iridium, platinum, and osmium are less com-mon. Micron-sized segregations of laurite, bowieite, сuproiridsite, cuprorhodsite, hollingworthite, as well as new mineral phases of (Ir,Rh,Os)7 (S,As)13 , (Rh,Ir,Ru) 7(S,As) 13, and Pd 3(Sb,As) were recognized as micro-inclusions in isoferroplatinum and on the surface of its grains. It is shown that

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Bussolesi, Micol, Giovanni Grieco, and Evangelos Tzamos. "Olivine–Spinel Diffusivity Patterns in Chromitites and Dunites from the Finero Phlogopite-Peridotite (Ivrea-Verbano Zone, Southern Alps): Implications for the Thermal History of the Massif." Minerals 9, no. 2 (2019): 75. http://dx.doi.org/10.3390/min9020075.

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The study of Mg–Fe2+ subsolidus exchange between olivine and spinel is a powerful tool to unravel the thermal history of ultramafic rocks. We have implemented such a study using olivine–spinel diffusivity patterns in fresh mineralogical samples from the Finero mafic-ultramafic Complex in the Ivrea-Verbano zone of Northern Italy. Our analytical suite includes chromitites and dunites of the Phlogopite-Peridotite Unit from the core of the Complex. Primary and re-equilibrated olivine and spinel compositions were derived from diffusivity curves calculated by fitting data via an exponential function

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Barkov, Andrei Y., Vladimir N. Korolyuk, Larisa P. Barkova, and Robert F. Martin. "Double-Front Crystallization in the Chapesvara Ultramafic Subvolcanic Complex, Serpentinite Belt, Kola Peninsula, Russia." Minerals 10, no. 1 (2019): 14. http://dx.doi.org/10.3390/min10010014.

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Dunite–harzburgite–olivine-bearing orthopyroxenite successions in the subvolcanic Chapesvara-I and Chapesvara-II intrusions in the Serpentinite Belt, western Kola Peninsula, are notably magnesian. The mean Mg# value (whole-rock) is 86.6, and the olivine is Fo84−89. The upper contact facies (UCF) displays a lower Mg# (81.6). It consists of grains of Fo92 and abundant chromian spinel, implying rapid crystallization of an almost unfractionated melt. On average, the whole-rock Al2O3/TiO2 value is 22.45, close to 22.9 (UCF) and to the primitive mantle, ~22. The rise of primitive ultramafic magma pr

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Stepanov, Sergey, Roman Palamarchuk, Aleksandr Kozlov, Dmitry Khanin, Dmitry Varlamov, and Daria Kiseleva. "Platinum-Group Minerals of Pt-Placer Deposits Associated with the Svetloborsky Ural-Alaskan Type Massif, Middle Urals, Russia." Minerals 9, no. 2 (2019): 77. http://dx.doi.org/10.3390/min9020077.

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The alteration of platinum group minerals (PGM) of eluval, proximal, and distal placers associated with the Ural-Alaskan type clinopyroxenite-dunite massifs were studied. The Isovsko-Turinskaya placer system is unique regarding its size, and was chosen as research object as it is PGM-bearing for more than 70 km from its lode source, the Ural-Alaskan type Svetloborsky massif, Middle Urals. Lode chromite-platinum ore zones located in the Southern part of the dunite “core” of the Svetloborsky massif are considered as the PGM lode source. For the studies, PGM concentrates were prepared from the he

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Xiong, Fahui, Jingsui Yang, Hans-Peter Schertl, Zhao Liu, and Xiangzhen Xu. "Multistage origin of dunite in the Purang ophiolite, southern Tibet, documented by composition, exsolution and Li isotope characteristics of constituent minerals." European Journal of Mineralogy 32, no. 1 (2020): 187–207. http://dx.doi.org/10.5194/ejm-32-187-2020.

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Abstract. The Purang ophiolite, which crops out over an area of about 650 km2 in the western Yarlung–Zangbo suture zone, consists chiefly of mantle peridotite, pyroxenite and gabbro. The mantle peridotite is comprised mainly harzburgite and minor dunite. Locally, the latter contains small pods of chromitite. Pyroxenite and gabbro occur as veins of variable size within the peridotite; most of them strike northwest, parallel to the main structure of the ophiolite. Three types of dunite occur in the Purang ophiolite: dunite that envelopes podiform chromitite (1) and lenses of dunite with either C

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ALEKSEEV, Aleksandr Valer’evich, and Tat’yana Andreevna SHERENDO. "Composition, structure and magnetic properties of ore chrome spinels of the Klyuchevsky massif (Middle Urals)." NEWS of the Ural State Mining University 1, no. 1 (2020): 73–85. http://dx.doi.org/10.21440/2307-2091-2020-1-73-85.

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The overall objective was to create a geological and geophysical field test site for chromite mineralization and detailed works in order to determine and test the main search criteria for disseminated mineralization. To create a field test site, an area was selected in the southern part of the Klyuchevsky massif characterized by abundant development of disseminated mineralization in the banded dunite-clinopyroxenite complex and strong processes of superimposed metamorphism. This paper gives a piece of research on the composition of chrome spinel from disseminated ores that underwent metamorphi

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Bussolesi, Micol, Giovanni Grieco, Alessandro Cavallo, and Federica Zaccarini. "Different Tectonic Evolution of Fast Cooling Ophiolite Mantles Recorded by Olivine-Spinel Geothermometry: Case Studies from Iballe (Albania) and Nea Roda (Greece)." Minerals 12, no. 1 (2022): 64. http://dx.doi.org/10.3390/min12010064.

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Mg-Fe2+ diffusion patterns in olivine and chromite are useful tools for the study of the thermal history of ultramafic massifs. In the present contribution, we applied the exponential modeling of diffusion patterns to geothermometry and geospeedometry of chromitite ores from two different ophiolite contexts. The Iballe ophiolite (Northern Albania) hosts several chromitite pods within dunites. Primary and re-equilibrated Mg#, estimated by using an exponential function, provided re-equilibration and primary temperatures ranging between 677 and 996 °C for chromitites and between 527 and 806 °C fo

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Karaseva, E. S., A. Yu Kissin, and V. V. Murzin. "The Poldnevskoye deposit of demantoid (Middle Urals): Geology and mineralogy." LITHOSPHERE (Russia) 21, no. 5 (2021): 683–98. http://dx.doi.org/10.24930/1681-9004-2021-21-5-683-698.

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Research subject. The results of studying the geology and mineralogy of the Poldnevskoye deposit of demantoid are presented. Material and methods. The factual material was collected during feld research. Demantoid samples were pro vided by mine owners. Rock and vein minerals were studied in hand specimens, polished specimens and thin sections; the chemical composition was determined by X-ray ﬂuorescence spectroscopy, scanning electron microscopy, electron probe X-ray spectral microanalysis, inductively coupled plasma mass spectrometry with laser sampling (LA-ICP-MS).Results. The Korkodinsky ul

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Divya, K. "Strengthening of AR Glass Fibre Concrete by Using Dunite Powder." International Journal for Research in Applied Science and Engineering Technology 11, no. 5 (2023): 2022–25. http://dx.doi.org/10.22214/ijraset.2023.51942.

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Abstract: In the contemporary era. Concrete, the most significant and frequently used material, frequently needs to have a very high strength and acceptable workability. Research on glass fibre reinforced concrete led to the development of alkali resistant fibres with a high capacity for dispersion, increasing long-term durability. When dunite is utilised as a cement alternative rather of regular cement, concrete is discovered to become up to 40% stronger. Studies based on periodic cement rate data show that, on average, dunite powder is less expensive than cement. Future cement usage will be

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Grieco, Giovanni, Alessandro Cavallo, Pietro Marescotti, Laura Crispini, Evangelos Tzamos, and Micol Bussolesi. "The Formation of Magnesite Ores by Reactivation of Dunite Channels as a Key to Their Spatial Association to Chromite Ores in Ophiolites: An Example from Northern Evia, Greece." Minerals 13, no. 2 (2023): 159. http://dx.doi.org/10.3390/min13020159.

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Ophiolite magnesite deposits are among the main sources of magnesite, a raw material critical for the EU. The present work focuses on magnesite occurrences at Kymasi (Evia Island, Greece), in close spatial association with chromitite within the same peridotite massif, and on the relationship between ultramafic rocks and late magnesite veins. Chromitite lenses are hosted within dunite, in contact with a partially serpentinized peridotite cut by magnesite veins. Close to the veins, the peridotite shows evidence of carbonation (forming dolomitized peridotite) and brecciation (forming a serpentini

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Baragaño, Diego, Rubén Forján, Juan María Menéndez Aguado, et al. "Reuse of Dunite Mining Waste and Subproducts for the Stabilization of Metal(oid)s in Polluted Soils." Minerals 9, no. 8 (2019): 481. http://dx.doi.org/10.3390/min9080481.

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The circular economy seeks to minimize the use of raw materials and waste generation. In this context, here we addressed the use of dunite mining tailings and subproducts to stabilize metal(oid)s in polluted soils. We first characterized the dunite mining tailings and subproducts, and a paradigmatic polluted soil in depth to determine their chemical and mineralogical properties. Experimental trials using Brassica juncea L. were performed to evaluate the impact of the two materials on vegetation growth, edaphic properties and pollutant stabilization yields. To this end, the plants were grown ov

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Sahera, Sk. "Mechanical Properties AR Glass Fibre Concrete by Using Dunite Powder." International Journal for Research in Applied Science and Engineering Technology 11, no. 5 (2023): 2012–14. http://dx.doi.org/10.22214/ijraset.2023.51938.

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Abstract: In the modern world. The most significant and commonly utilised material, concrete, must frequently have a very high strength and appropriate workability.Alkali resistant fibres with a high capacity for dispersion were created as a consequence of research in glass fibre reinforced concrete, which increased long-term durability.Alkali resistant glass fibres have been used in the current experimental examination to explore the impact on compressive and split tensile strength on M30 grade of concrete.Concrete is found to become up to 40% stronger when dunite is used as a cement substitu

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Ishimaru, Satoko, Yuji Saikawa, Makoto Miura, Osman Parlak, and Shoji Arai. "Decoding of Mantle Processes in the Mersin Ophiolite, Turkey, of End-Member Arc Type: Location of the Boninite Magma Generation." Minerals 8, no. 10 (2018): 464. http://dx.doi.org/10.3390/min8100464.

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The Mersin ophiolite, Turkey, is of typical arc type based on geochemistry of crustal rocks without any signs of mid-ocean ridge (MOR) affinity. We examined its ultramafic rocks to reveal sub-arc mantle processes. Mantle peridotites, poor in clinopyroxene (<1.0 vol.%), show high Fo content of olivine (90–92) and Cr# [=Cr/(Cr + Al) atomic ratio] (=0.62–0.77) of chromian spinel. NiO content of olivine is occasionally high (up to 0.5 wt.%) in the harzburgite. Moho-transition zone (MTZ) dunite is also highly depleted, i.e., spinel is high Cr# (0.78–0.89), clinopyroxene is poor in HREE, and oliv

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Krasnobaev, A. A., and V. N. Anfilogov. "Zircons: Implication for dunite genesis." Doklady Earth Sciences 456, no. 1 (2014): 535–38. http://dx.doi.org/10.1134/s1028334x1405033x.

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Braun, Michael G., and Peter B. Kelemen. "Dunite distribution in the Oman Ophiolite: Implications for melt flux through porous dunite conduits." Geochemistry, Geophysics, Geosystems 3, no. 11 (2002): 1–21. http://dx.doi.org/10.1029/2001gc000289.

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Álvarez Agudelo, Jairo, and Raúl H. Muñoz Arango. "Distribución de cromo, níquel y cobalto en la saprolita y en los concentrados de sedimentos fluviales derivados de las dunitas de Medellín." Boletín Geológico 28, no. 3 (1987): 45–71. http://dx.doi.org/10.32685/0120-1425/bolgeol28.3.1987.308.

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En el cuerpo de dunitas de Medellín, se presentan varios depósitos podiformes de cromita. En una zona restringida de dicho cuerpo, alrededor de una ocurrencia de cromita, se hizo un estudio geoquímico sobre la distribución de Ni, Co y Cr en la saprolita y en los concentrados en batea procedentes de la ultramafita, con el fin de conocer la utilidad de estos elementos como indicadores de mineralizaciones. Los análisis fueron realizados por espectrografía semicuantitativa. El níquel y el cobalto en la saprolita son afectados notoriamente por la meteorización química siendo redistribuidos y lixivi

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Liu, Jianguo, Jian Wang, Keiko Hattori, and Zeli Wang. "Petrogenesis of Garnet Clinopyroxenite and Associated Dunite in Hujialin, Sulu Orogenic Belt, Eastern China." Minerals 12, no. 2 (2022): 162. http://dx.doi.org/10.3390/min12020162.

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The origin of ultramafic rocks, especially those in suture zones, has been a focus because they are not only important mantle sources of magma, but also provide substantial information on metamorphism and melt/fluid–peridotite interaction. Ultramafic rocks in Hujialin, in the central part of the Sulu orogen, include peridotite and pyroxenite. Although many papers on their origin and tectonic evolution have been published in the past few decades, these questions are still highly debated. Here, we present mineralogy, mineral composition, and bulk-rocks of these ultramafic rocks to evaluate their

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Simonov, V. A., A. V. Kotlyarov, V. V. Sharygin, and Yu R. Vasiliev. "Crystallization conditions of olivine in dunites the Guli massif, Siberian platform." МИНЕРАЛОГИЯ (MINERALOGY) 10, no. 1 (2024): 16–31. http://dx.doi.org/10.35597/2313-545x-2024-10-1-2.

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Crystallization conditions of olivine in dunites of the Guli massif (Siberian Platform) are established using petrological, geochemical, mineralogical and thermobarogeochemical methods. The formation of olivine and chromite from picrite-meimechite ultramafc magmas was followed by the fractionation of clinopyroxenes from basaltic systems with the formation of residual high-alkaline melts. The calculations in PETROLOG and COMAGMAT programs based on the compositions of inclusions and minerals, as well as using olivine-spinel geothermometer, showed that a magmatic system, which was responsible for

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Saveliev, D. E. "Morphological and Compositional Features of Chromian Spinel from Mantle Ultramafic Rocks of The Nurali Massif (South Urals)." МИНЕРАЛОГИЯ (MINERALOGY) 5 (December 27, 2019): 3–18. http://dx.doi.org/10.35597/2313-545x-2019-5-4-1.

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Accessory chromian spinels of lherzolites and dunites from a mantle section of the Nurali ophiolite massif are described in the paper. Lherzolites typically host anhedral chromian spinel grains associated with olivine, pyroxenes and plagioclase. The compositions of silicates and chromian spinels are typical of those from ophiolite mantle sections. Olivine and orthopyroxene are characterized by high Mg content (forsterite and enstatite); clinopyroxene is diopside. The compositions of chromian spinel on the Al–Cr–Fe+3 plot occur close to the Al–Cr side. The #Cr and #Mg values of chromian spinels

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Hu, Wen-Jun, Mei-Fu Zhou, Marina A. Yudovskaya, Ilya V. Vikentyev, John Malpas, and Peng-Fei Zhang. "Trace Elements in Chromite as Indicators of the Origin of the Giant Podiform Chromite Deposit at Kempirsai, Kazakhstan." Economic Geology 117, no. 7 (2022): 1629–55. http://dx.doi.org/10.5382/econgeo.4955.

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Abstract This study presents a complete trace element data set of chromite from the world’s largest podiform chromite deposit at Kempirsai, Kazakhstan, together with platinum group element (PGE) and Re-Os isotope compositions, to explore the potential of trace elements in the study of podiform chromite deposits. Chromite orebodies in the Karaagash area of the Kempirsai Main ore field are hosted by dunites in the mantle sequence of the ophiolite. Dunites slightly distal to the orebodies are composed of olivine (forsterite content = 91.5–93.4) and minor euhedral chromite with variable Cr# (0.73–

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Demetriou, Antri, and Ioannis Pashalidis. "Adsorption of hexavalent chromium on dunite." Water Science and Technology 63, no. 4 (2011): 818–24. http://dx.doi.org/10.2166/wst.2011.118.

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The paper presents and discusses the effect of various physicochemical parameters (e.g. pH, ionic strength, Cr(VI) initial concentration, amount of the adsorbent, temperature and contact time between metal ion and adsorbent) on the adsorption efficiency of Cr(VI) on dunite in aqueous solutions under atmospheric conditions. Evaluation of the experimental data shows that dunite presents increased affinity for Cr(VI) over a wide pH range and Cr(VI) concentration, and the experimental data are well fitted by the Kd adsorption model. The relative adsorption is pH dependent and decreases slightly (a

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Demetriou, Antri, Michaela Lysandrou, Antonios Charalambides, and Ioannis Pashalidis. "Acid mine drainage treatment with dunite." Desalination and Water Treatment 16, no. 1-3 (2010): 129–33. http://dx.doi.org/10.5004/dwt.2010.1049.

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Kislov, E. V. "Dunite of the Ioko-Dovyrensk massif." Refractories 36, no. 12 (1995): 399–404. http://dx.doi.org/10.1007/bf02227138.

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Agrawal, Amit Kumar, and Anurag Mehra. "Dunite carbonation in batch-tubular reactor." Environmental Science and Pollution Research 27, no. 25 (2020): 31439–45. http://dx.doi.org/10.1007/s11356-020-09426-4.

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Madeddu, Silvia, Michael Priestnall, Erik Godoy, et al. "Extraction of Mg(OH)2 from Mg silicate minerals with NaOH assisted with H2O: implications for CO2 capture from exhaust flue gas." Faraday Discussions 183 (2015): 369–87. http://dx.doi.org/10.1039/c5fd00047e.

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The utilisation of Mg(OH)<sub>2</sub> to capture exhaust CO<sub>2</sub> has been hindered by the limited availability of brucite, the Mg(OH)<sub>2</sub> mineral in natural deposits. Our previous study demonstrated that Mg(OH)<sub>2</sub> can be obtained from dunite, an ultramafic rock composed of Mg silicate minerals, in highly concentrated NaOH aqueous systems. However, the large quantity of NaOH consumed was considered an obstacle for the implementation of the technology. In the present study, Mg(OH)<sub>2</sub> was extracted from dunite reacted in solid systems with NaOH assisted with H<sub

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Dvornik, Gennadiy Petrovich. "Distribution platinum content in chromite and dunite type ores Nizhny Tagil massif (Middle Ural)." NEWS of the Ural State Mining University, no. 2 (June 15, 2023): 62–71. http://dx.doi.org/10.21440/2307-2091-2023-2-62-71.

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The relevance of the work is due to the importance industrial meaning native and placer platinum deposits in basic-hiperbasic complexes. Methods of research included separation industrial type of ores for valuation quality platinum ore chute, use probabilistic-statistic, geometric-statistic and geostatistic model for description amplitude and frequency changeability in distribution platinum content in ore Nizhny Tagil massif. Result research. In chromite ores Nizhny Tagil massif platinum content vary in wide limits by predominance among theirs rich and ordinary ores and extremely uneven distri

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Karklit, A. K., L. E. Kademina, and L. M. Myznikova. "Properties of dunites from the Inaglinsk deposits." Refractories 29, no. 3-4 (1988): 231–34. http://dx.doi.org/10.1007/bf01389565.

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