 | | Book | | phrases as <Kazakhstan,Ā» etc., appeared in the Russian papers. In non-Russian...territory of the former Soviet Union, the Urals, Kazakhstan, and Central Asia, where many new minerals were...of Ct,ervonograd, Lvov-Volyn coal basin, Lvov district, W Ukraine. This mineral fills small cavities...aeschynite-(Ce) occurs with feldspar, micas. nepheline, magnetite, zircon, and pyrochlore in an alkaline pegmatite...tungsten deposit, Betpakdala Desert, Central Kazakhstan (earlier the Solnechnoye was known as the Western |  | | Journal (article/letter/editorial) | | Early Paleoproterozoic Monchegorsk Layered MaficāUltramafic Complex, Kola Peninsula E. V. Sharkov and A....comprises two independent large layered maficāultramafic intrusions: the Monchegorsk pluton and the Main...Early Paleoproterozoic Monchegorsk layered maficāultramafic complex situated in the northeast ern Baltic...km2. These are the Monchegorsk Nibearing maficāultramafic pluton (Monchepluton) and the Main Range mafic...Early Paleoproterozoic (2.5ā2.4 Ga) layered maficāultramafic intrusions with NiāCuāPGE min eralization localized |  | | Journal (article/letter/editorial) | | intrusions of different age: the Monchegorsk pluton of ultramafic and mafic rocks and the predominantly gabbroid...features and probably be parts of a single large intrusion (the Monchegorsk intru sion), in which the Monchegorsk...1978; Mitrofanov, 1995; Daly et al., 2006). From north to south, these blocks are (1) the Murmansk block...its probable analogues: (a) mafic rocks, (b) ultramafic rocks; (2) Paleoproterozoic volcanoāsedimentary...(4) units of rhyth mic alternating mafic and ultramafic cumulates, including dunites; (5) predominantly |  | | Report (issue) | | Ultrabasic Group . Field Relations Petrography of Dunite Mineralogy of Chromite Deposits Mineralogy of Late... Geological Map of the Hangha Chromite Mining District, reduced from 1 : 2,500 Field Survey " Surface...Chromiferous Dunite Lens " 14 Subsurface Geology of the Amba Chromiferous Dunite Lens . ,, 15 Cross-section...Cross-section of the Amba Lens at Co-ordinate Line 225 North ,, 17 Surface Geology of the North and South Bendu...I. Banded Chromiferous Dunite from Amba Pit, Hangha Chromite Mining District, Sierra Leone. 2. Detail |  | | Journal (article/letter/editorial) | | mode of occurrence of chromite and Cr-bearing, magnetite-rich spinel is within massive FeāNi sulphides...grains in olivine orthocumulate, Mt Keith Western Ultramafic Complex, back-scattered electron image; (b) skeletal...chromite enclosing small olivine grains, Six Mile dunite body, reflected light; (d) lobate chromite, showing...rimmed by magnetite (black) interstitial to partially serpentinized olivine grains, Mt Clifford dunite body;...log units above or below the quartzāfayaliteāmagnetite (QFM) buffer. Dashed lines are extrapolated curves |  | Duuring, Paul, Bleeker, Wouter, Beresford, Steve W., Hayward, Nicholas (2010) Towards a volcanicāstructural balance: relative importance of volcanism, folding, and remobilisation of nickel sulphides at the Perseverance NiāCuā(PGE) deposit, Western Australia. Mineralium Deposita, 45 (3) 281-311 doi:10.1007/s00126-009-0274-y | Journal (article/letter/editorial) | | along the western margin of the Perseverance Ultramafic Complex (PUC). The PUC comprises a basal nickel...overlain by a thicker, nickel sulphide-poor, dunite lens. Hanging wall rocks include rhyodacite that is...partitioning of strain along the margins of the competent dunite. A mylonite developed in the more ductile footwall...stress domains along the fringes of the elongated dunite lens. Strata-bound massive and disseminated nickel...rocks to the thick, olivine adcumulate-textured dunite lens (Barnes et al. 1988a; Fig. 2). These researchers |  | Derbyshire, E.J., O'Driscoll, B., Lenaz, D., Zanetti, A., Gertisser, R. (2019) Chromitite petrogenesis in the mantle section of the Ballantrae Ophiolite Complex (Scotland) Lithos, 344. 51-67 doi:10.1016/j.lithos.2019.06.013 | Journal (article/letter/editorial) | | harzburgite typically hosts veins and sheets of ED dunite, pyroxenite and chromitite (>60 vol.% Cr-spinel)...populations of chromitites in the Kempirsai ophiolite (Kazakhstan), one with high Cr# [Cr/(Cr+Al)] Cr-spinel and...Valley Fault and unconformably overlain to the north by younger Llanvirn Barr and Caradoc-Ashgill Ardmillian...invoking folding of the lava sequence, serpentinite intrusion and an anticlinal structure for the PT complex...comprises variably serpentinised harzburgite and dunite which crop out in two broad NE-SW trending belts |  | | Journal (article/letter/editorial) | | units containing high proportions of adcumulate dunite. Cumulate flow units have been mapped in detail...within the dunite lenses. In the stratigraphically equivalent Kathleen East area adcumulate dunite grades...where the Perseverance ultramafic complex consists of a thick central dunite lens flanked on one side by...indicate an extrusive origin for the adcumulate dunite bodies. The Waiter Williams Formation, in the west-central...consists of a central sheet-like body of adcumulate dunite, underlain and overlain by olivine orthocumulates |  | | Journal (article/letter/editorial) | | spatially associated with a lenticular body of ultramafic rocks which shows a concentric zonation in metamorphic...enstatite assemblages occur at the margin of the ultramafic lens, giving way to olivine + anthophyllite, olivine...pre-metamorphic marginal alteration of the ultramafic lens. Metamorphic fluids were essentially binary...Metamorphic mineral assemblages in the lenticular ultramafic body at the Agnew mine show an overall zonation...is stable in the Agnew area, and in rocks as far north as the Six Mile deposit. Binns and Groves (1976) |  | Rosengren, N. M., Grguric, B. A., Beresford, S. W., Fiorentini, M. L., Cas, R. A. F. (2007) Internal stratigraphic architecture of the komatiitic dunite-hosted MKD5 disseminated nickel sulfide deposit, Mount Keith Domain, Agnew-Wiluna Greenstone Belt, Western Australia. Mineralium Deposita, 42 (8) 821-845 doi:10.1007/s00126-007-0139-1 | Journal (article/letter/editorial) | | Internal stratigraphic architecture of the komatiitic dunite-hosted MKD5 disseminated nickel sulfide deposit...deposit is hosted by the Mount Keith Ultramafic Complex (MKUC), a dunite body of komatiitic affinity located...internal units that range from extreme adcumulate dunite to relatively fractionated pyroxenitic and gabbroic...is interpreted to represent a later pulse of ultramafic magma, emplaced stratigraphically above the main...despite apparent geometrical differences between lens and sheet komatiitic dunites, a broad facies architecture |  | | Journal (article/letter/editorial) | | et al., 1990). The Pindos ocean extends further north in Albania and Yugoslavia. Ophiolites in Yugoslavia...ophiolite belt consisting mainly of harzburgite-dunite exhibits economically significant chromite potential...363-381 all chromite ores are found within dunite bodies or dunite envelopes in harzburgite, there is not...not a systematic relation between size of the dunite body and that of the ore body. The sizes of the ore...deposits of W. Chalkidiki peninsula occur in altered dunite and mostly are of schlieren type, though occurrences |  | | Report (issue) | | on a suite of rock samples from the Josephine ultramafic complex in northern California in an attempt...measurements of samples indicate that chromite, dunite and harzburgite can be mutally separated by using...exclusively in dunite lenses in a country rock made up almost entirely of harzburgite. The dunite and harzburgite...remaining interstitial material is derived from dunite, and is largely serpentine minerals. The chromite...increased amount of tectonization in its enveloping dunite lens. The consequence, therefore, of the tectonic |  | FarkaÅ”, Juraj, ChrastnĆ½, Vladislav, NovĆ”k, Martin, Äadkova, Eva, PaÅ”ava, Jan, Chakrabarti, Ramananda, Jacobsen, Stein B., Ackerman, LukĆ”Å”, Bullen, Thomas D. (2013) Chromium isotope variations (Ī“53/52Cr) in mantle-derived sources and their weathering products: Implications for environmental studies and the evolution of Ī“53/52Cr in the Earthās mantle over geologic time. Geochimica et Cosmochimica Acta, 123. 74-92 doi:10.1016/j.gca.2013.08.016 | Journal (article/letter/editorial) | | such as peridotites (lherzolite, harzburgites, dunite), pyroxenites and their alteration/metamorphic...0.082 Ā± 0.058& (2SD), (samples from Bushweld Intrusion, South Africa; and Great Dyke, Zimbabwe, cf. Schoenberg...the Alpine orogen (podiform chromite in residual dunite and harzburgites)2 Bosnia Mid-oceanic ridge settings...peridotite/serpentine)1214 Macedonia MORB (?) chromite in dunite rocks3,14 Cyprus Russia Russia M-Neoproter. (1758ā584...orogen (chromite in dunite lens in Ordovician (470 harzburgites)4 Ma) N/A N/A Kazakhstan Fore-arc of the |  | | Journal (article/letter/editorial) | | Manuscript Metallogeny of the peridotite-hosted magnetite ores of the Nain ophiolite, Central Iran: implications...Mackizadeh, Metallogeny of the peridotite-hosted magnetite ores of the Nain ophiolite, Central Iran: implications...pertain. Metallogeny of the peridotite-hosted magnetite ores of the Nain ophiolite, Central Iran: implications...address: alireza.eslami@modares.ac.ir Abstract Magnetite bodies of the Late Cretaceous Nain ophiolite mĆ©lange...consist of m-scale lenses and pods of massive magnetite rocks exposed along a semi-brittle shear zone |  | | Journal (article/letter/editorial) | | Fe-rich tholeiiticbasalts, gabbros, komatiitic ** ultramafic rocks and some basalts which appear chemically...sulfide mineralization occurs mainly within the dunite pods as large (in excess of 70"106 tonnes) low...magnesian liquid, it is postulated that the source region of the mantle must have been melted twice, once...vicinity of Kalgoorlie in the Eastern Goldfields region of Western Australia have been well documented...mineralization is associated with sequences of ultramafic flows (komatiites*), c o m m o n l y occurring |  | JimĆ©nezāFranco, Abigail, GonzĆ”lezāJimĆ©nez, JosĆ© M., RoquĆ©, Josep, Proenza, JoaquĆn A., Gervilla, Fernando, Nieto, Fernando (2020) Nanoscale constraints on the in situ transformation of RuāOsāIr sulfides to alloys at low temperature. Ore Geology Reviews, 124. 103640pp. doi:10.1016/j.oregeorev.2020.103640 | Journal (article/letter/editorial) | | reaction with reducing fluids was also documented in ultramafic massifs affected by regional metamorphism within...et al., 2017) and concentricallyāzoned maficāultramafic complexes (Malitch et al., 2011; Okrugin, 2011)...sequence, of decreasing fS2 in the mantle source region, which would promote the breakdown of PGEābearing...of Monte Bueno from the Sagua de TĆ”namo mining district in eastern Cuba (Fig. 1; Proenza et al., 1999;...2011). The Sagua de TĆ”namo area is a small mining district (~3 km long), located in the easternmost part |  | | Report (volume) | | metallurgy would be inevitable (Thayer, 1973). Ultramafic rocks of the alpine peridotite type are common...northwestern California because of the presence in this region of a few unmined or partially mined podiform chromite...studies, the physical properties of a suite of ultramafic rocks and chromites were determined in the laboratory...Photograph showing cumulate textures in chromitiferous dunite._ 11 3. Rose diagram of steep faults cutting the...layers in harzburgite ____________________ 17 6. Dunite with discontinuous zone of orthopyroxenite in harzburgite |  | | Journal (article/letter/editorial) | | upper mantle depleted harzburgite and cumulative dunite from crustal sections of the Neyriz ophiolite,...ophiolite complex is mainly composed of tectonized ultramafic rocks. The mantle section is composed of a nearly...It becomes highly depleted and interlayered with dunite upward into the mantleācrust transition zone (Fig...section, comprising a thick massive serpentinized dunite, occurs immediately on the mantleācrust transition...(including depleted harzburgite and subordinate dunite) and grades progressively into wehrlite (Fig. 2c) |  | | Report (issue) | | ___ ___ 4 3-5. Photographs of: 3. Chromitiferous dunite showing ehromite-net and occluded-silicate textures...______________________________ 7 5. Orthopyroxenite layers and dunite layers in harzburgite __________________________________...Photographs of: 7. Chromite foliation in dunite at high angle to dunite-harzburgite contact _________________________...texture in dunite __________________________________________ 11 9. Flattened rods of ehromite in dunite at an...an angle to dunite-harzburgite contact _____________________ 11 10-12. Sketches illustrating: 10. Isoclinal |  | Barnes, S. J., Godel, B. M., Locmelis, M., Fiorentini, M. L., Ryan, C. G. (2011) Extremely Ni-rich FeāNi sulfide assemblages in komatiitic dunite at Betheno, Western Australia: results from synchrotron X-ray fluorescence mapping. Australian Journal of Earth Sciences, 58 (7) 691-709 doi:10.1080/08120099.2011.586048 | Journal (article/letter/editorial) | | Ni-rich FeāNi sulļ¬de assemblages in komatiitic dunite at Betheno, Western Australia: results from synchrotron...Australia. 2 Fresh unserpentinised komatiitic dunite at Betheno (Western Australia) contains a distinctive...and particularly where such ores are hosted by ultramafic rocks (Eckstrand 1975; Donaldson 1981; Frost...in interpreting FeāNiāS assemblages in altered ultramafic rocks lies in not knowing the composition of...liquid. This is particularly true in the komatiitic dunite-hosted disseminated deposits of the east Yilgarn |  | | Journal (article/letter/editorial) | | sulfidesis extensive,and massiveviolarite-pyrite-magnetite zonesare developedin weatheringprofiles. Polyphasedeformationand...sulfides,with developmentof pyrite-, violarite-,and magnetite-richores. Nickel valuesand Ni/Cu ratiosvary for... Perth, Western Australia 6000, Australia near North Ironcap, and the first major intersection * Pre...granular dunites,to remobilized veins in both host dunite and footwall countryrocks.Massivesulfidesare uncommonin...SouthernCross-Forrestaniagreenstonebelt extendsin a north-southdirectionover a length of of the earlierdeformationtextures |  | | Journal (article/letter/editorial) | | the Komatiite-Hosted Six Mile Well and Goliath North Deposits and Implications for the Architecture of...contained Ni) and Goliath North (~0.6 Mt contained Ni) dunite lenses. These dunite lenses form part of the...the same komatiitic ultramafic unit that hosts the giant Mount Keith MKD5 deposit (>2.6 Mt contained Ni)...Ni) to the north, but the morphology and internal stratigraphy of the host unit differs significantly...Three-dimensional modeling of the Yakabindie region reveals that each dunite lens is located at the intersection between |  | | Journal (article/letter/editorial) | | peridotitcs throughout the lithosphere of the axial region. The ultramafics studied have mineral compositions...ridges [10-12], and on near-bottom observation of ultramafic and gabbroic axial outcrops [3,5,7,8]. Petrological...leading to the formation of a gabbroic or an ultramafic seafloor. Work on gabbros from the Southwest...in the axial valley inner floor, 16 miles to the north of the western intersection of the valley with the...Bathymetric map of the Mid-Atlantic Ridge axis north of the 15Ā°20'N fracture zone [20]. Dredge 8 (diamond) |  | | Journal (article/letter/editorial) | | disseminated FeāNi sulphides within komatiitic dunite bodies (Lesher and Keays 2002; Barnes 2006; Grguric...contains three ultramafic horizons from stratigraphic bottom to top: (1) the Mount Keith Ultramafic unit (MKU)...(MKU), (2) the Cliffs Ultramafic unit (CLU), and (3) the Monument Ultramafic AUSTRALIA 200km STUDY AREA...wall dacites (Fig. 2). unit (MU). The three ultramafic belts are separated by a variably deformed sequence...volcanological architecture of the Mount Keith Ultramafic Complex is interpreted as a subhorizontal, subvolcanic |  | Xiong, Fahui, Yang, Jingsui, Robinson, Paul T., Xu, Xiangzhen, Liu, Zhao, Li, Yuan, Li, Jinyang, Chen, Songyong (2015) Origin of podiform chromitite, a new model based on the Luobusa ophiolite, Tibet. Gondwana Research, 27 (2) 525-542 doi:10.1016/j.gr.2014.04.008 | Journal (article/letter/editorial) | | olivine and magnesiochromite compositions from the dunite envelope to the massive ore, indicating meltrock...podiform chromitites and associated lenticular dunite bodies represent small magma chambers in which...a new CE P understanding of the formation of dunite bodies in ophiolites (Kelemen et al., 1992). Because...(5) What is the origin and significance of the dunite veins and envelopes associated with many podiform...orebodies as well as 5 ACCEPTED MANUSCRIPT numerous dunite lenses and veins. For this study, we have analysed |
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