 | González-Jiménez, José María, Locmelis, Marek, Belousova, Elena, Griffin, William L., Gervilla, Fernando, Kerestedjian, Thomas N., O'Reilly, Suzanne Y., Pearson, Norman J., Sergeeva, Ivanina (2015) Genesis and tectonic implications of podiform chromitites in the metamorphosed ultramafic massif of Dobromirtsi (Bulgaria) Gondwana Research, 27 (2) 555-574 doi:10.1016/j.gr.2013.09.020 | Journal (article/letter/editorial) | | in the metamorphosed ultramafic massif of Dobromirtsi (Bulgaria) José María González-Jiménez a,⁎, Marek...of Sciences, 24 Georgi Bonchev Str., 1113 Sofia, Bulgaria b a r t i c l e i n f o Article history: Received...chromitites occur in the meta-dunite horizon of the Dobromirtsi ultramafic massif, in the Central Rhodope metamorphic...metamorphic core complex (southern Bulgaria). Although these were deformed and metamorphosed together with...suggest that the ultramafic protolith of the Dobromirtsi ophiolite was derived from an original Archean |  | | Journal (article/letter/editorial) | | Ophiolite Chromitites from the Dobromirtsi Massif, Rhodope Mountains (Bulgaria) José María González-Jiménez...Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria and 3Departament de Cristal·lografia, Mineralogia...Abstract The Dobromirtsi Ultramafic Massif, located in the Rhodope Mountains (SE Bulgaria), is a portion...other ophiolite chromitites, those found in Dobromirtsi carry abundant platinum-group minerals (PGM)...(PGE) concentrations and PGM mineralogy in the Dobromirtsi chromitites were studied to a limited extent |  | González-Jiménez, JoséM., Gervilla, Fernando, Proenza, Joaquín A., Kerestedjian, Thomas, Augé, Thierry, Bailly, Laurent (2009) Zoning of laurite (RuS2)erlichmanite (OsS2): implications for the origin of PGM in ophiolite chromitites. European Journal of Mineralogy, 21 (2) 419-432 doi:10.1127/0935-1221/2009/0021-1921 | Journal (article/letter/editorial) | | Sciences, 24 Georgi Bonchev Str., 1113 Sofia, Bulgaria 4 BRGM (Bureau de recherches géologiques et minières)...Cuba) and in the Dobromirtsi metamorphosed ultramafic (ophiolitic) massif (SE Bulgaria) with regard to...magma mixing, Mayarı́.Baracoa Ophiolite Belt, Dobromirtsi Ultramafic Massif. 1. Introduction The platinum-group...chromitites of the Dobromirtsi Ultramafic (ophiolite) Massif in the Rhodope Mountains (SE Bulgaria) is a good...chromitite occurrences from the Dobromirtsi Ultramafic Massif in SE Bulgaria (Tarkian et al., 1991; Kerestedjian |  | | Journal (article/letter/editorial) | | concentrations of PGEs have been documented in chromite ± magnetite ± sulfide ± arsenide ores associated with komatiites...the chromite deposits of the Dobromirtsi Massif (southern PT Bulgaria). The final example was chosen...chromite deposits of the CE Dobromirtsi Ultramafic Massif (southern Bulgaria): primary origin and effects...Tertiary Rhodope Metamorphic Core Complex in southern Bulgaria and northern Greece contains numerous slivers...slivers of metamorphosed ophiolite complexes. The Dobromirtsi Ultramafic Massif is the largest of these ophiolitic |  | González-Jiménez, José María, Gervilla, Fernando, Proenza, Joaquín A., Augé, Thierry, Kerestedjian, Thomas (2009) Distribution of platinum-group minerals in ophiolitic chromitites. Applied Earth Science, 118 (3) 101-110 doi:10.1179/174327509x12550990457924 | Journal (article/letter/editorial) | | Sciences, 24 Georgi Bonchev Str., 1113 Sofia, Bulgaria 2 *Corresponding author, email jmgonzj@ugr.es...Tehuitzingo, Mexico; Ray-Iz, Rusia; and Dobromirtsi, Bulgaria), Mesozoic ophiolitic complexes (chromitites...Scotland Austria Austria Russia Australia Canada Bulgaria Cyprus Greece Greece Greece Oman Turkey Cuba...Min. Metall. B) Thetford Mines(*) 2009 VOL Dobromirtsi(*) Troodos(*) Othrys(*) Vourinos(**) Pindos(**)...from chromitites of the Dobromirtsi Ultramafic Massif (southeastern Bulgaria). C and D from chromitites |  | Colás, Vanessa, González-Jiménez, José M., Griffin, William L., Fanlo, Isabel, Gervilla, Fernando, O'Reilly, Suzanne Y., Pearson, Norman J., Kerestedjian, Thomas, Proenza, Joaquín A. (2014) Fingerprints of metamorphism in chromite: New insights from minor and trace elements. Chemical Geology, 389. 137-152 doi:10.1016/j.chemgeo.2014.10.001 | Journal (article/letter/editorial) | | of Sciences, 24 Georgi Bonchev Str., 1113 Sofia, Bulgaria f Departament de Cristal lografia, Mineralogia...2012; Grieco and Merlini, 2012). Occasionally magnetite rims surround the cores and/or the ferrian chromite...produced by the reaction of pristine cores with magnetite rims during prograde metamorphism of serpentinised...the Rhodope Metamorphic Core Complex in southern Bulgaria. The chromitites and their host ultramafic rocks...Rhodope Metamorphic Core Complex, of southern Bulgaria and northern Greece (Table 2 and Fig. 1). The |  | González-Jiménez, José María, Griffin, William L., Gervilla, Fernando, Proenza, Joaquín A., O'Reilly, Suzanne Y., Pearson, Norman J. (2014) Chromitites in ophiolites: How, where, when, why? Part I. A review and new ideas on the origin and significance of platinum-group minerals. Lithos, 189. 127-139 doi:10.1016/j.lithos.2013.06.016 | Journal (article/letter/editorial) | | and 9 are from chromitites of the Dobromirtsi Ultramafic Massif, Bulgaria; 3–5 and 8 are from the chromitites...platinum-group alloys are associated with Ni–Fe alloys ± magnetite indicative of very reduced conditions (b−38 log...in Argentina (Proenza et al., 2008) or Dobromirtsi in Bulgaria (González-Jiménez et al., 2010). The higher...metamorphosed chromitites of the Dobromirtsi peridotite (Central Rhodope Complex, Bulgaria) laurites wholly enclosed...chromite rims of the metamorphosed chromitites of Dobromirtsi show a wider dispersion of 187Os/ 188 Os than |  | | Journal (article/letter/editorial) | | bulk of the serpentinite groundmass and minor magnetite (Mag) located at grain edges. (b) Backscattered-electron...grain have slightly higher Cr#. Note the bright magnetite in the cracks. (c) Backscattered-electron image...which are due to lower Mg#. Highly reflective magnetite overgrowths occur in fractures within grains....Cr-spinel with slightly higher Fe in the rim. Magnetite fills cracks and surrounds the upper right corner...preserved primary mineral. Fine-grained dusty magnetite forms less than 1 vol.% of samples and has nearendmember |  | Merinero, Raúl, Lunar, Rosario, Ortega, Lorena, Piña, Rubén, Monterrubio, Serafín, Gervilla, Fernando (2014) Zoned chromite records multiple metamorphic episodes in the Calzadilla de los Barros ultramafic bodies (SW Iberian peninsula) European Journal of Mineralogy, 26 (6) 757-770 doi:10.1127/ejm/2014/0026-2406 | Journal (article/letter/editorial) | | transformation to ferrian chromite and Cr-rich magnetite. However, some of them exhibit complex chemical...chlorite (clinochlore) and lesser amounts of magnetite, rutile, chalcedony and Cu-Ni-Fe sulphides (Merinero...Material). The composition is close to Cr-rich magnetite with traces of Al2O3 (, 0.50 wt.%) and MgO (,4...S3; Fig. 7a). The Cr2O3 content of the Cr-rich magnetite correlates negatively (p , 0.001, r2. 0.77) with...the outer rim is mostly non-porous with Cr-rich magnetite composition comparatively richer in Fe2O3 content |  | González-Jiménez, José M., Proenza, Joaquín A., Martini, Michelangelo, Camprubí, Antoni, Griffin, William L., O'Reilly, Suzanne Y., Pearson, Norman J. (2017) Deposits associated with ultramafic–mafic complexes in Mexico: the Loma Baya case. Ore Geology Reviews, 81. 1053-1065 doi:10.1016/j.oregeorev.2015.05.014 | Journal (article/letter/editorial) | | serpentine, talc, chromium clinochlore, and Cr-rich magnetite (Ortiz-Hernández, 1984; Ortiz-Hernández et al...the Golyamo Kamenyane serpentinite, in southern Bulgaria. The porous rim shows higher reflectivity under...more recently, from ophiolitic chromitites at Dobromirtsi in the Bulgarian Rhodopes (González-Jiménez et... 2005; GonzálezJiménez et al., 2012a), Dobromirtsi, Bulgaria (González-Jiménez et al., 2010), Tehuitzingo...chromite ores from the Dobromirtsi Ultramafic Massif, Rhodope Mountains (SE Bulgaria). Geol. Acta 4, 413–427 |  | | Journal (article/letter/editorial) | | pentlandite, pentlandite + heazlewoodite + magnetite, heazlewoodite + magnetite + platinum-group minerals (PGM)...through the interaction between chromite cores and magnetite rims (Bliss and MacLean, 1975; Barnes, 2000) or...low Fe3+/Fe2+ ratios, then was transformed to magnetite in a relatively oxidizing environment. However...decrease significantly (Fig. 3e). Locally, Cr-magnetite occurs between the chloritized matrix and the...pentlandite + heazlewoodite + magnetite, (3) heazlewoodite + magnetite + PGM, and (4) millerite ± heazlewoodite |  | González-Jiménez, José M., Reich, Martin, Camprubí, Antoni, Gervilla, Fernando, Griffin, William L., Colás, Vanessa, O’Reilly, Suzanne Y., Proenza, Joaquín A., Pearson, Norman J., Centeno-García, Elena (2015) Thermal metamorphism of mantle chromites and the stability of noble-metal nanoparticles. Contributions to Mineralogy and Petrology, 170 (2) doi:10.1007/s00410-015-1169-9 | Journal (article/letter/editorial) | | tremolite, talc, chromium clinochlore and Cr-rich magnetite (up to 15 wt% Cr2O3). Olivine occurs as small...hosts inclusions of serpentine and/or Cr-rich magnetite (Fig. 2a). Tremolite forms irregularly disseminated...in the vicinity of relatively large, Cr-rich magnetite grains (100– 300 µm) that are highly irregular...with corroded outlines and always fractured. Magnetite also occurs as minute (<50 µm), disseminated xenomorphic...Loma Baya. a Assemblage of serpentine + Cr-rich magnetite replaced by a larger porphyroblast of olivine |  | Gervilla, F., Asta, M. P., Fanlo, l., Grolimund, D., Ferreira-Sánchez, D., Samson, V. A., Hunziker, D., Colas, V., González-Jiménez, J. M., Kerestedjian, T. N., Sergeeva, I. (2019) Diffusion pathways of Fe2+ and Fe3+ during the formation of ferrian chromite: a µXANES study. Contributions to Mineralogy and Petrology, 174 (8) doi:10.1007/s00410-019-1605-3 | Journal (article/letter/editorial) | | rates of diffusion of F e3+ and F e2+ (a magnetite component with F e3+/Fetotal = 0.66) into the...Institute, 24 Georgi Bonchev Str, 1113 Sofía, Bulgaria 13 Vol.:(0123456789) 65 Page 2 of 16 has...composition that overlaps the whole chromite–magnetite series, corresponding to the general formula Fe2+(Cr...chromite rims are in turn frequently enveloped by magnetite which often is made up of subhedral crystals with...incomplete replacement of chromian spinel by magnetite. In this model, iron was supplied by serpentinizing |  | | Journal (article/letter/editorial) | | core, and (C) the youngest apatite-phlogopite-magnetite-rich clinopyroxenite of stockwork exposed in...clinopyroxenite-dunite complexes located within the Aldan Province, in the southeastern part of the Siberian Craton...melanocratic gabbro rim, and (C) an apatite-phlogopite-magnetite-rich clinopyroxenite stockwork exposed in the...and (2) apatite4 Journal Pre-proof phlogopite-magnetite-rich clinopyroxenites (zone C). We integrated...clinopyroxenites enriched -p in apatite, phlogopite, and magnetite, forming a stockwork-like zone C exposed in the |  | | Journal (article/letter/editorial) | | Discovery of the Solomon iron deposits, Hamersley Province, Western Australia—D. Kepert, D. N. Clarke, C...Creek and Robertson Range Projects, Hamersley Province, Western Australia—P. Darvall, R. McCarthy, and...mineralisation at E deposit (East), Area C, Hamersley Province, Western Australia— F.M. Bodycoat 49 A synopsis...of the channel iron deposits of the Hamersley Province, Western Australia—E.R. Ramanaidou and R.C. Morris...study of the mechanism of the replacement of magnetite by pyrite up to 300°C—Gujie Qian, Joël Brugger |  | | Journal (article/letter/editorial) | | (2) a later event transforms chromite into Cr-magnetite accompanied by chlorite formation. The most common...scale consisting of FeCr spinel at the bottom, magnetite in the middle and a hematite cap layer. In dry...Golyamo Kamenyane serpentinite, Eastern Rhodopes, SE Bulgaria: a two-stage process. – Contributions to Mineralogy...chromite ores from the Dobromirtsi ultramafic massif, Rhodope mountains (SE Bulgaria). – Geologica Acta 7:...the metamorphosed ultramafic massif of Dobromirtsi (Bulgaria). – Gondwana Research 27: 555 – 574. Goutier |  | Gervilla, F., Padrón-Navarta, J. A., Kerestedjian, T., Sergeeva, I., González-Jiménez, J. M., Fanlo, I. (2012) Formation of ferrian chromite in podiform chromitites from the Golyamo Kamenyane serpentinite, Eastern Rhodopes, SE Bulgaria: a two-stage process. Contributions to Mineralogy and Petrology, 164 (4) 643-657 doi:10.1007/s00410-012-0763-3 | Journal (article/letter/editorial) | | Golyamo Kamenyane serpentinite, Eastern Rhodopes, SE Bulgaria: a two-stage process F. Gervilla • J. A. Padrón-Navarta...of the Eastern Rhodope Metamorphic Complex, SE Bulgaria. It consists of metaharzburgite and metadunite...Institute, 24 Georgi Bonchev Str., 1113 Sofia, Bulgaria J. M. González-Jiménez ARC National Key Centre...ferrian chromite composition by the addition of magnetite to the porous ferrous chromite during a late oxidizing...metamorphism by reaction between chromite cores and magnetite rims, mainly at amphibolite-facies conditions |  | | Journal (article/letter/editorial) | | contents in chromian spinel included in magnetite from magnetite veins. The results published by El Ghorfi...(2007) in samples from serpentinite and small magnetite veins (b 20 cm) — “accompanying the Co-arsenide...any temporal or spatial relationship between magnetite veins and Co-arsenide mineralizations in the Bou...surrounded by ferrian chromite rims and, occasionally, magnetite outer rims, has been mainly interpreted in terms...by addition and diffusion of a magnetite component, either from magnetite rims (Barnes, 2000; Grieco and |  | | Journal (article/letter/editorial) | | chromite bodies in association with chromitite and magnetite (Figure 2). Chromite is often characterized by...texture of chromitite associated with sulphides and magnetite from the peripheral parts of podiform chromitite...Dobromirci, Jacovitsa, Broucevci and Goliamo–Kamenjane (Bulgaria) (Figure 1) are completely serpentinized, locally...isotopic compositions of magmatic PGM on the Dobromirtsi chromitites, a long-term history involving reworking...of graphite with sperrylite and sulphides in magnetite ore from the Skyros ophiolite complex has also |  | Colás, Vanessa, Padrón-Navarta, José Alberto, González-Jiménez, José María, Fanlo, Isabel, López Sánchez-Vizcaíno, Vicente, Gervilla, Fernado, Castroviejo, Ricardo (2017) The role of silica in the hydrous metamorphism of chromite. Ore Geology Reviews, 90. 274-286 doi:10.1016/j.oregeorev.2017.02.025 | Journal (article/letter/editorial) | | extremely higher Fe2O3 non-porous chromite and magnetite rims, and (iii) non-porous chromite grains. The...by non-porous chromite and an outermost rim of magnetite, with antigorite and chlorite inclusions (Fig...samples, while antigorite and irregular patches of magnetite are exclusively found in serpentinites (Fig. 3)...scattered in the silicate matrix and included in the magnetite patches, pores of partly altered chromite and...Fe3+/(Fe3++Fe2+) = 0.16-0.25) to nonporous and magnetite rims of zoned chromite grains (Cr# = 0.67-0.99 |  | Günay, Kurtuluş, Dönmez, Cahıt, Uysal, İbrahim, Yıldırım, Nail, Şahin, M. Bahadır, Yıldırım, Esra, Tablacı, Abdurrahman, Kang, Jisuk, Lee, Insung (2016) Chrome spinel geochemistry of ultramafic rocks from the Elekdağ metaophiolite (Northern Turkey): Implications for greenschist to mid-amphibolite facies metamorphism. Neues Jahrbuch für Mineralogie - Abhandlungen Journal of Mineralogy and Geochemistry, 193 (3) 215-230 doi:10.1127/njma/2016/0303 | Journal (article/letter/editorial) | | lower amphibolite facies chromite is replaced by magnetite. The last stage of chromite alteration of the...metaophiolite is represented by chromite destruction and magnetite formation with maximum FeOT, Fe2O3, FeOT/MgO,...petrographic zoning from Cr-spinels and give rise to Cr-magnetite and/or ferrian chromite with a uniform chemistry...along fractures in massive chromitites. C–D: Magnetite alteration in harzburgite (1– 2 – 3 show optically...and homogeneous forms of ferrian chromite and magnetite are found. second counting time. Synthetic and |  | | Journal (article/letter/editorial) | | (commonly olivine) or oxide minerals (chromite, magnetite or ilmenite in discrete oxide horizons such...of Fe-Ti oxide compositions by diluting the magnetite reduction role (as will be explained below), and...species, all runs started above the hematite– magnetite (HM) buffer by using oxidised iron in the starting...TiO2-free runs consisted of either pure hematite or magnetite, corresponding to final fO2 conditions higher...lower relative to the HM buffer, respectively. Magnetite usually occurs as octahedral crystals, but also |  | Barra, Fernando, Gervilla, Fernando, Hernández, Elkin, Reich, Martin, Padrón-Navarta, José Alberto, González-Jiménez, José Maria (2014) Alteration patterns of chromian spinels from La Cabaña peridotite, south-central Chile. Mineralogy and Petrology, 108 (6) 819-836 doi:10.1007/s00710-014-0335-5 | Journal (article/letter/editorial) | | chromite, and >0.5 in ferrian chromite and Cr-magnetite. Interpretation of the data obtained and Cr-spinel...fluid/rock and Cr-spinel/ silicate ratios, Cr-magnetite can also form over Fe2+-rich chromite and/or ferrian...reaction between primary chromite and secondary magnetite deposited over the chromite grains during prograde...responsible for the formation of an Fe-rich or Cr-magnetite rim in chromitites from Tuscany, Italy. These...actually a complex sub-micron scale assemblage of Cr-magnetite, chlorite and lizardite. In addition, Merlini |  | | Journal (article/letter/editorial) | | chromian spinel are rimmed by ferritchromite and Cr-magnetite. The development of alteration rims around chromian...the serpentinites, c – BSE image showing thin magnetite streaks and striations disposed along the cleavage...orthopyroxene, and d – BSE image showing fine magnetite clusters surrounding olivine crystals thophyllite...modally). They are mainly chromian spinels and magnetite as well as minor specks of pyrite. Chromian spinel...section, whilst in reflected light it is rimmed by magnetite with numerous interstices filled with serpentine |  | | Journal (article/letter/editorial) | | of high-Al and high-Cr chromitites from Greece, Bulgaria and the Kempirsai Massif (Urals) reveals a strong...expected to behave in a similar way in chromite and magnetite as they share similar ionic radii (Cr3+ , r =...analyses of chromite from chromitites of Greece, Bulgaria and Kempirsai (Urals). Vourinos Pindos Skyros...Rhodope Massif Skyros Urals Kempirsai Greece Bulgaria wt% Sky. 4 Sky. 5 Soufli 1 Soufli 2 Gomati...Kempirsai Greece Sky. 5 Soufli 1 Soufli 2 Bulgaria Gomati Broucevci Jacovitsa Pletena Goliamo |
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