 | | 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 |  | | Journal (article/letter/editorial) | | The lowtemperature serpentine-group mineral lizardite is dominant and high-temperature antigorite is...Transmitted-light image of Cr-spinel, with pseudomorphic lizardite (Liz) forming the bulk of the serpentinite groundmass...fractures within grains. The black material is lizardite. The embayed nature of the grain suggests a primary...that the dominant serpentine-group mineral is lizardite, with minor chrysotile (Saumur et al., 2010)....around the Cr-spinel (Cr-spl) which overprints lizardite (Liz) and is intergrown with magnetite (Mag) (Sample |  | Derbyshire, E.J., O'Driscoll, B., Lenaz, D., Gertisser, R., Kronz, A. (2013) Compositionally heterogeneous podiform chromitite in the Shetland Ophiolite Complex (Scotland): Implications for chromitite petrogenesis and late-stage alteration in the upper mantle portion of a supra-subduction zone ophiolite. Lithos, 162. 279-300 doi:10.1016/j.lithos.2012.11.013 | Journal (article/letter/editorial) | | silicate mineral assemblages with serpentine (lizardite with minor chrysotile and antigorite). Magmatic...silicate mineral assemblages, predominantly to lizardite. The second was a prograde oxidation event, the...antigorite component, with lesser amounts of lizardite and chrysotile. A combination of whole rock powder...Hagdale and Harold's Grave dunites are dominated by lizardite, with subsidiary antigorite and chrysotile. 4...observed, in which discontinuous rims of intergrown lizardite and chlorite (termed ‘septechlorite' as per Mellini |  | 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) | | scale assemblage of Cr-magnetite, chlorite and lizardite. In addition, Merlini et al. (2009) have also...based on studies of podiform chromitites from Bulgaria, suggested that the alteration of chromite occurs...variable degree of serpentinization of olivine to lizardite with accessory (<1 % volume) Cr-spinel grains...antigorite is predominant over chrysotile and lizardite. Chrysotile is present as thin veinlets. No traces... The olivine is been replaced by serpentine (lizardite) forming a mesh texture. f Accessory Crspinel |  | | Journal (article/letter/editorial) | | has a composition equivalent to chrysotile and lizardite (Fig. 5a), although minor antigorite presence...Compositional fields for antigorite, chrysotile and lizardite are from Singh and Singh (2013). (c) Compositional...of Cr-rich magnetite with silicates (chlorite/lizardite as deduced by TEM analysis), which can account...plausibly at T’s below 300 °C where chrysotile and lizardite are the stable serpentine polymorphs (e.g. Schwartz...chromite alteration: example from Costurino, SE Bulgaria. In: Revista de la sociedad espaňola de mineralogia |  | | Journal (article/letter/editorial) | | of chlorite and Cr-spinel are observed in the lizardite mesh-textures (Figure 2a, b). The original orthopyroxene...of orthopyroxene and olivine are observed with lizardite–chrysotile mesh in the least metamorphosed serpentinite;...metamorphosed serpentinite is composed essentially of lizardite with subordinate amounts of antigorite, Cr-spinel...interstitial serpentine matrix consists of mesh-textured lizardite Geol. J. (2012) DOI: 10.1002/gj A. K. SINGH... the analyzed serpentine minerals are mainly lizardite and chrysotile with subordinate antigorite. The |  | Romero, Rurik, González-Jiménez, José M., Barra, Fernando, Leisen, Mathieu, Garrido, Leonardo N., Talavera, Cristina, Gain, Sarah E. M., Griffin, William L., O’Reilly, Suzanne Y., Reich, Martin, Morata, Diego (2018) Timing the tectonic mingling of ultramafic rocks and metasediments in the southern section of the coastal accretionary complex of central Chile. International Geology Review, 60 (16) 2031-2045 doi:10.1080/00206814.2017.1402377 | Journal (article/letter/editorial) | | isolated blocks of lizardite-rich metadunites (<60% of olivine replaced by lizardite) embedded in a matrix...al. 2001; González-Jiménez et al. 2016). Both lizardite-bearing metadunites and antigorite serpentinites...with predominant antigorite over chrysotile and lizardite, and Cr-spinels as disseminated anhedral grains...which promoted the replacement of olivine by lizardite ± magnetite. On the other hand, schistose and...the metamorphosed ultramafic massif of Dobromirtsi (Bulgaria): Gondwana Research, v. 27, p. 555–574. |  | Colás, Vanessa, González-Jiménez, José María, Camprubí, Antoni, Proenza, Joaquín A., Griffin, William L., Fanlo, Isabel, O’Reilly, Suzanne Y., Gervilla, Fernando, González-Partida, Eduardo (2019) A reappraisal of the metamorphic history of the Tehuitzingo chromitite, Puebla state, Mexico. International Geology Review, 61 (14) 1706-1727 doi:10.1080/00206814.2018.1542633 | Journal (article/letter/editorial) | | characterized by the replacement of primary olivine to lizardite/chrysotile, and pyroxene to bastite. During the...event led to the retrogression of antigorite to lizardite/chrysotile between 250 and 350 ºC, at ~ 2 kbar...e. laminar crystals of antigorite replaced by lizardite with interpenetrative texture, chrysotile filling...reaction because the hydration of antigorite to lizardite and/or chrysotile adds SiO2 in the serpentinite...chrysotile, Gth: goethite, Hem: hematite, Lz: lizardite, Mfr: magnesioferrite, Mt: magnetite, Ol: olivine |  | | Journal (article/letter/editorial) | | antigorite (Text-fig. 3a, b) with lesser amounts of lizardite. Antigorite occurs as platy aggregates with characteristic...characteristic plumose texture. Lizardite is rare and occurs as elongated crystals forming a bundle-like...Survey of Egypt, 9, 125–135. Evans, B.W. 2010. Lizardite versus antigorite serpentinite: magnetite, hydrogen...chromite ores from the Dobromirtsi ultramafic Massif, Rhodope Mountains (SE Bulgaria). Geologica Acta, 7 |  | | Journal (article/letter/editorial) | | serpentinization, which produced the pseudomorphic lizardite-chrysotile serpentinites, was followed by less...characterized by harzburgitic mantle section, lizardite serpentinization, few cataclastic shear zones...depleted does not occur during low-temperature, lizardite serpentinization (Gonzaléz-Jiménez et al., 2009)...chromite ores from the dobromirtsi ultramafic massif, rhodope mountains (SE Bulgaria). Geol. Acta 7, 413–429 |  | 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...metamorphosed ophiolite complex located in SE Bulgaria. The results are discussed in terms of a two-stage...Eastern Rhodopes crystalline massif, in south Bulgaria (Kolcheva et al. 2000; Haydoutov et al. 2004; |  | Hodel, F., Trindade, R.I.F., Macouin, M., Meira, V.T., Dantas, E.L., Paixão, M.A.P., Rospabé, M., Castro, M.P., Queiroga, G.N., Alkmim, A.R., Lana, C.C. (2019) A Neoproterozoic hyper-extended margin associated with Rodinia's demise and Gondwana's build-up: The Araguaia Belt, central Brazil. Gondwana Research, 66. 43-62 doi:10.1016/j.gr.2018.08.010 | Journal (article/letter/editorial) | | characterized PT by a typical pseudomorphic lizardite/chrysotile mesh texture (Fig. 3a, b, c, d). Most...texture with wider and parallel pseudo-columnar lizardite mesh rims resulting from an oriented NU fracturing...cores are composed of a chrysotile/lizardite PT E assemblage. Lizardite forms the mesh rims and is locally...chrysotile veins commonly cross-cut the mesh textured lizardite/chrysotile assemblage and antigorite veins (Fig...4. Two-step serpentinization MA The typical lizardite/chrysotile pseudomorphic texture of the Araguaia |  | Hodel, F., Macouin, M., Triantafyllou, A., Carlut, J., Berger, J., Rousse, S., Ennih, N., Trindade, R.I.F. (2017) Unusual massive magnetite veins and highly altered Cr-spinels as relics of a Cl-rich acidic hydrothermal event in Neoproterozoic serpentinites (Bou Azzer ophiolite, Anti-Atlas, Morocco) Precambrian Research, 300. 151-167 doi:10.1016/j.precamres.2017.08.005 | Journal (article/letter/editorial) | | the Aït Ahmane serpentinites precursor. Typical lizardite/chrysotile pseudomorphic texture in fresh serpentinites...investigated samples are fully serpentinized. Lizardite is the most abundant serpentine polymorph according...across the mesh and at the intergrains of two lizardite grains formed after olivine crystals. Antigorite...retrograde replacement of a primary antigorite by lizardite. Chlorite, carbonates (calcite and stichtite)...texture of unaltered serpentinites as well as the lizardite/chrysotile assemblages suggest an oceanic-like |  | González-Jiménez, José M., Barra, Fernando, Garrido, Leonardo N.F., Reich, Martin, Satsukawa, Takako, Romero, Rurik, Salazar, Eduardo, Colás, Vanessa, Orellana, Felipe, Rabbia, Osvaldo, Plissart, Gaëlle, Morata, Diego (2016) A secondary precious and base metal mineralization in chromitites linked to the development of a Paleozoic accretionary complex in Central Chile. Ore Geology Reviews, 78. 14-40 doi:10.1016/j.oregeorev.2016.02.017 | Journal (article/letter/editorial) | | partly serpentinized peridotites (i.e., olivine–lizardite dunites). Thermodynamic calculations using the...mm) replaced by pseudomorphic (mesh texture) lizardite, with minor amounts of pyroxene and Cr-spinel...serpentinization processes). Overall, both the olivine–lizardite dunites and antigorite (± talc) serpentinite show...that there are differences between the olivine–lizardite dunites (only in the Centinela Bajo Norte body)...heazlewoodite (Ni3S2) were identified in the olivine– lizardite dunites. In contrast, the relatively high contents |  | González-Jiménez, José María, Barra, Fernando, Walker, Richard J., Reich, Martin, Gervilla, Fernando (2014) Geodynamic implications of ophiolitic chromitites in the La Cabaña ultramafic bodies, Central Chile. International Geology Review, 56 (12) 1466-1483 doi:10.1080/00206814.2014.947334 | Journal (article/letter/editorial) | | mm) replaced by pseudomorphic (mesh texture) lizardite, with minor amounts of primary pyroxenes. The...Eastern Desert, Egypt (Ahmed et al. 2006); Dobromirtsi, Bulgaria (González-Jiménez et al. 2013b); Kraubath...Golyamo Kamenyane serpentinite, Eastern Rhodopes, SE Bulgaria: A two-stage process: Contributions to Mineralogy...in the metamorphosed Ultramafic Massif of Dobromirtsi (Bulgaria): Gondwana Research. doi:10.1016/j.gr.2013 |  | | Journal (article/letter/editorial) | | serpentine mineral, which, however, has low amounts of lizardite and chrysotile, indicating that the present serpentinites...antigorite with small amounts of chrysotile and lizardite. Antigorite mostly occurs as interpenetrating...prograde reaction product is antigorite, while lizardite is a characteristic product of a retrograde reaction...antigorite, with lower amount of chrysotile and lizardite, which indicates that serpentinites formed under...chromite ores from the Dobromirtsi ultramafic Massif, Rhodope Mountains (SE Bulgaria): Geologica Acta, v |  | Lay, Angela, Graham, Ian, Cohen, David, Privat, Karen, González-Jiménez, Jose Maria, Belousova, Elena, Barnes, Sarah-Jane (2017) Ophiolitic Chromitites of Timor Leste: Their Composition, Platinum Group Element Geochemistry, Mineralogy, and Evolution. The Canadian Mineralogist, 55 (5) 875-908 doi:10.3749/canmin.1500032 | Journal (article/letter/editorial) | | divided into West Timor (part of the Nusa Tenggara Province of Indonesia) and Timor Leste/East Timor (an independent...and various serpentine-group minerals (e.g., lizardite, clinochrysotile or orthochrysotile; determined...or well-developed mesh textures of chrysotile-lizardite after olivine (Figs. 4A and 6A, B). The fresh...are composed of chrysotile veinlets surrounding lizardite, with traces of enstatite, magnesite, Mg-rich...diopside or augite), talc, and spinel, while lizardite, chrysotile, magnetite, and bastite formed during |  | González-Jiménez, J.M., Proenza, J.A., Gervilla, F., Melgarejo, J.C., Blanco-Moreno, J.A., Ruiz-Sánchez, R., Griffin, W.L. (2011) High-Cr and high-Al chromitites from the Sagua de Tánamo district, Mayarí-Cristal ophiolitic massif (eastern Cuba): Constraints on their origin from mineralogy and geochemistry of chromian spinel and platinum-group elements. Lithos, 125 (1) 101-121 doi:10.1016/j.lithos.2011.01.016 | Journal (article/letter/editorial) | | are up to 3 m thick. Olivine is transformed to lizardite but minor antigorite is also present. The dunite...ubiquitous amphibole. Olivine is transformed to a lizardite-magnetite assemblage displaying mesh textures...in Mexico (Zaccarini et al., 2005) and Dobromirtsi in Bulgaria (González-Jiménez et al., 2010). Such variations...ophiolite chromitites from the Dobromirtsi massif, Rhodope Mountais (SE Bulgaria). Resources Geology 60 (4) |  | | Journal (article/letter/editorial) | | represented mainly by antigorite and less commonly by lizardite and chrysotile. Antigorite flakes are found as...most common prograde reaction product, while lizardite is the most common of retrograde product. Our...predominance of antigorite over chrysotile and lizardite suggests that the serpentinites record -p temperatures...Planetary Sciences5, 397–447. Evans, B.W., 2010. Lizardite versus antigorite serpentinite: magnetite, hydrogen...chromite ores from the Dobromirtsi ultramafic Massif, Rhodope Mountains (SE Bulgaria). Geologica Acta 7, |  | 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) | | dunite and wehrlites is composed of 1) chrysotile+lizardite ± relict orthopyroxene ± relict olivine ± opaque...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 |  | Abdel-Karim, Abdel-Aal M., Ali, Shehata, Helmy, Hassan M., El-Shafei, Shymaa A. (2016) A fore-arc setting of the Gerf ophiolite, Eastern Desert, Egypt: Evidence from mineral chemistry and geochemistry of ultramafites. Lithos, 263. 52-65 doi:10.1016/j.lithos.2016.05.023 | Journal (article/letter/editorial) | | consists principally of antigorite, chrysotile and lizardite with subordinate amounts of calcite, and opaques...Science 29, MA 515–533. Evans, B.W., 2010. Lizardite versus antigorite serpentinite: magnetite, hydrogen...chromite ores from the Dobromirtsi ultramafic Massif, Rhodope Mountains (SE Bulgaria). Geologica Acta 7, |  | González-Jiménez, José M., Camprubí, Antoni, Colás, Vanessa, Griffin, William L., Proenza, Joaquín A., O'Reilly, Suzanne Y., Centeno-García, Elena, García-Casco, Antonio, Belousova, Elena, Talavera, Cristina, Farré-de-Pablo, Júlia, Satsukawa, Takako (2017) The recycling of chromitites in ophiolites from southwestern North America. Lithos, 294. 53-72 doi:10.1016/j.lithos.2017.09.020 | Journal (article/letter/editorial) | | of harzburgite made up of olivine replaced by lizardite, and lesser amounts pyroxene transformed to bastite...dunites consist chiefly of olivine replaced by lizardite and chrysotile, with accessory chromite (< 5%...dunites; they consist of olivine partly replaced by lizardite, pyroxenes and magnetite after chromite. In contrast...the metamorphosed Ultramafic Massif of Dobromirtsi (Bulgaria). Gondwana Res. 27, 555–574. MA González-Jiménez...chromitites from the eastern Rhodope ultramafic complex, Bulgaria. Mineralogy and Petrology 44, 73–87. CE Ulmer |  | | Journal (article/letter/editorial) | | olivine. The second stage is the serpentinization (lizardite and chrysotile) of the olivine rich chromitite...temperatures above 300 °C will transform most lizardite/chrysotile into the high-temperature polymorph...Golyamo Kamenyane serpentinite, Eastern Rhodopes, SE Bulgaria: a two-stage process. Contrib. Mineral. Petrol...chromite ores from the Dobromirtsi Ultramafic Massif, Rhodope Mountains (SE Bulgaria). Geol. Acta 7, 413–429 |  | | Journal (article/letter/editorial) | | Cr-spinel, in a groundmass composed predominantly of lizardite (Figs. 3a, 3b). The Cr-spinel forms subhedral-anhedral...chromite ores from the Dobromirtsi Ultramafic Massif, Rhodope Mountains (SE Bulgaria). Geologica Acta, 7 |  | | Journal (article/letter/editorial) | | antigorite with lesser amounts of chrysotile, lizardite, magnesite, talc, chlorite, brucite, and magnetite...chromite ores from the Dobromirtsi Ultramafic Massif, Rhodope Mountains (SE Bulgaria). Geologica Acta, 7...Cürek-Divriği in Sivas province and at Güvenç, Karakuz Hekimhan in Malatya province, Central East Turkey |
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