 | | Journal (article/letter/editorial) | | COMPOSITION IN THE ALTERED AND DEFORMED BACURI COMPLEX, AMAPA, NORTHEASTERN BRAZIL HAZEL M. PRICHARD§ Department...Universidade Federal da Bahia, 40.170-290 Salvador, Bahia, Brazil PETER C. FISHER Department of Earth Sciences,...CF10 3YE, Wales, U.K. ABSTRACT In the Bacuri complex, Amapa, Brazil, there is good evidence for Pd mobility...compositions most typical of chromite from a stratiform complex of continental origin. Keywords: platinum-group...serpentinization, Bacuri complex, Amapa, Brazil. SOMMAIRE Le complexe igné de Bacuri, dans l’état d’Amapa |  | | Journal (article/letter/editorial) | | ultramafic rocks from the Bacuri, Niquelândia and Ipueira-Medrado layered complexes in Brazil were investigated...investigated. The Bacuri Complex (2?2 Ga) is a large layered intrusion of the Amazon Craton. Chromitite layers...layers of the Bacuri mafic-ultramafic complex are restricted to a 30–120 m-thick sequence of ultramafic cumulates...Niquelândia Complex (0?8 Ga) is a large layered intrusion in central Brazil. The Niquelândia Complex has a...note that chromitite seams in the Niquelândia Complex are mainly hosted by dunite. Different from chromitites |  | | Journal (article/letter/editorial) | | Ipueira-Medrado Sill, São Francisco Craton, Bahia State, Brazil JULIANA CHARÃO MARQUES† Instituto de Geociências...Caixa Postal 15001, CEP 91501-970, Porto Alegre-RS, Brazil AND CESAR FONSECA FERREIRA FILHO Instituto de...Universitário, Asa Norte, Brasília-DF, CEP 70910-900, Brazil Abstract The Ipueira-Medrado mafic-ultramafic...mafic-ultramafic sill hosts the largest chromite deposit in Brazil. The sill is a 7-kmlong and 300-m-thick elongated...representing the largest concentration of chromite in Brazil (Marinho et al., 1986). The ore in the Ipueira-Medrado |  | | Journal (article/letter/editorial) | | Rocks in the Rio Jacaré Intrusion, Northeastern Brazil J. H. S. SÁ, Centro de Pesquisa em Geofísica e...Universidade Federal da Bahia 40.170-290 Salvador, Bahia, Brazil S-J. BARNES, Sciences de la Terre, Université...northeastern Brazil. The intrusion hosting these magnetite bodies consists predominantly of pyroxenite and gabbro...Companhia Baiana de Pesquisa Mineral, Salvador, Brazil) † Corresponding author: e-mail, Prichard@cardiff...3-16 $6.00 established that some samples of pyroxenite and magnetitite from the Rio Jacaré intrusion |  | | Journal (article/letter/editorial) | | Complex multistage genesis for the Ni–Cu–PGE mineralisation in the southern region of the Platreef, Bushveld...Bushveld Complex, South Africa D. Hutchinson and Judith A. Kinnaird In the southern portion of the Platreef...Ni–Cu–Pt-group element (PGE) mineralisation results from a complex interplay of pre-, syn- and post-magmatic processes...to the footwall contact. More compositionally complex sulphides are associated with felsic melt phases...antimonides, bismuthides, bismutho-antimonides and complex bismuthotellurides. Pt-bearing phases mostly occur |  | Prichard, Hazel M., Mondal, Sisir K., Mukherjee, Ria, Fisher, Peter C., Giles, Nicolas (2018) Geochemistry and mineralogy of Pd in the magnetitite layer within the upper gabbro of the Mesoarchean Nuasahi Massif (Orissa, India) Mineralium Deposita, 53 (4) 547-564 doi:10.1007/s00126-017-0754-4 | Journal (article/letter/editorial) | | layer occurs at a high stratigraphic level in the complex and is nearly 4-km long and 5–12-m thick. The sections...Magnetitite . Chromitite . Sill-like layered igneous complex . Upper gabbro unit . Nuasahi Massif Introduction...ones include the Bushveld Complex (Barnes et al. 2004) and the Stella Complex (Maier et al. 2003) both...of South Africa, the Rio Jacaré Sill in Bahia, Brazil (Sá et al. 2005), the Skaergaard Intrusion in Greenland...g., Nielsen et al. 2015), the Rincón del Tigre Complex in Bolivia (Prendergast 2000), the Birch Lake and |  | | Journal (article/letter/editorial) | | Mafic-Ultramafic Complex: Further constraints for the PGE-mineralized magmatism in Carajás, Brazil Eduardo Teixeira...Mafic-Ultramafic Complex: Further constraints for the PGE-mineralized magmatism in Carajás, Brazil, LITHOS (2016)...Mafic-Ultramafic Complex: further constraints for the PGE-mineralized magmatism in Carajás, Brazil SC R IP...Universidade de Brasília, Brasília-DF, 70910-900, Brazil. email: etmansur@gmail.com 2 Instituto de Geociências...Universidade de Brasília, Brasília-DF, 70910-900, Brazil. email: cesarf@unb.br AC CE P TE D Corresponding |  | | Journal (article/letter/editorial) | | frequent wehrlite. The transitional cumulative complex is made up of rhythmic alternation of dunite, chromitite...olivine gabbro, pyroxenite, and anorthosite. The upper part of the cumulative complex is overlain by the...precipitation with thiourea; chloride forms and their complex compounds were obtained, with subsequent quantitative...Characteristics of rocks pertaining to the Restitic Complex and Rocks That Host Mineralizing Intrusive Rocks...Rocks Intrusive rocks of the restitic complex are represented by dunite, harzburgite, and clinopyroxenebearing |  | Prichard, Hazel M., Suárez, Saioa, Fisher, Peter C., Knight, Robert D., Watson, John S. (2018) Placer platinum-group minerals in the Shetland ophiolite complex derived from anomalously enriched podiform chromitites. Mineralogical Magazine, 82 (3) 491-514 doi:10.1180/minmag.2017.081.099 | Journal (article/letter/editorial) | | PLATINUM-GROUP MINERALS IN THE SHETLAND OPHIOLITE COMPLEX DERIVED FROM ANOMALOUSLY ENRICHED PODIFORM CHROMITITES...Harold's Grave localities in the Shetland ophiolite complex have been well documented previously. The focus...surficial conditions. Keywords: Shetland ophiolite complex, Cliff, Harold's Grave, alluvial concentrates,...harzburgite overlain by crustal dunite, wehrlite, pyroxenite and gabbro, with a few dykes intruded into the...in the overlying crustal dunite, wehrlite and pyroxenite sequence contain IPGM in discontinuous chromite |  | Suárez, Saioa, Prichard, Hazel M., Velasco, Francisco, Fisher, Peter C., McDonald, Iain (2010) Alteration of platinum-group minerals and dispersion of platinum-group elements during progressive weathering of the Aguablanca Ni–Cu deposit, SW Spain. Mineralium Deposita, 45 (4) 331-350 doi:10.1007/s00126-009-0275-x | Journal (article/letter/editorial) | | the northeastern part the Santa Olalla plutonic complex (Fig. 1). This is a small and highly heterogeneous...volcanoclastic and carbonate rocks (Bodonal-Cala Complex) overlying Late Precambrian metasedimentary rocks...hypersthene–hornfels aureole surrounding the plutonic complex (Casquet 1980; Velasco 1976). The deposit consists...showing the location of the Santa Olalla Pluton Complex and the Aguablanca mine (Agb). Modified from Casquet...The post-magmatic evolution of the deposit is complex and includes a pervasive and intense polyphase |  | Mota-e-Silva, J., Prichard, H. M., Filho, C. F. Ferreira, Fisher, P. C., McDonald, I. (2015) Platinum-group minerals in the Limoeiro Ni–Cu–(PGE) sulfide deposit, Brazil: the effect of magmatic and upper amphibolite to granulite metamorphic processes on PGM formation. Mineralium Deposita, 50 (8) 1007-1029 doi:10.1007/s00126-015-0585-0 | Journal (article/letter/editorial) | | minerals in the Limoeiro Ni–Cu–(PGE) sulfide deposit, Brazil: the effect of magmatic and upper amphibolite to...igneous tubular conduit system in northeastern Brazil. Representative ores from the deposit have been...13212-161, Brazil 2 Instituto de Geociências, Universidade de Brasilia, Brasília, DF 70900-970, Brazil 3 ...the Merensky Reef and Platreef in the Bushveld complex in the Republic of South Africa (Naldrett et al...Zimbabwe (Wilson et al. 2000), and the Stillwater complex in the USA (Godel and Barnes 2008). In contrast |  | | Journal (article/letter/editorial) | | into Pyrite in the Fazenda Mirabela Intrusion, Brazil Robert D. Knight,1,†,* Hazel M. Prichard,1,** and...Brasília-DF 70910-900, Brazil Abstract The Fazenda Mirabela intrusion in Brazil hosts two zones of mineralization...intrusion located in Bahia State, northeastern Brazil (Fig. 1), hosts the stratiform Santa Rita Ni-Cu...been omitted as the stratigraphy is slightly more complex. These plots demonstrate that S-poor dunite samples...remaining three are Rh dominant and are slightly more complex with the addition of Os (Rh-Ir-Pt-As-S, Rh-Pt-Os-As-S |  | Mondal, Sisir K., Khatun, Sarifa, Prichard, Hazel M., Satyanarayanan, M., Kumar, G.R. Ravindra (2019) Platinum-group element geochemistry of boninite-derived Mesoarchean chromitites and ultramafic-mafic cumulate rocks from the Sukinda Massif (Orissa, India) Ore Geology Reviews, 104. 722-744 doi:10.1016/j.oregeorev.2018.11.027 | Journal (article/letter/editorial) | | Sukinda Massif as part of an Archean ophiolitic complex. Acharyya (1993) suggested possibilities of the...craton; the Singhbhum Granite Complex is the largest batholithic complex (3.3 – 3.1 Ga; Mishra et al....and the Bacuri Complex in Amapa, Brazil (e.g., Prichard et al., 2017a). In the Kemi Complex in Finland...example in the chromitites in Campo Formosa and Bacuri and in a breccia zone and in the magnetitite bands...chromite deposits in India such as the Nuggihalli Complex (Western Dharwar craton) are also ‘conduit’ type |  | Barnes, Sarah-Jane, Prichard, Hazel M., Cox, Richard A., Fisher, Peter C., Godel, Belinda (2008) The location of the chalcophile and siderophile elements in platinum-group element ore deposits (a textural, microbeam and whole rock geochemical study): Implications for the formation of the deposits. Chemical Geology, 248 (3) 295-317 doi:10.1016/j.chemgeo.2007.08.004 | Journal (article/letter/editorial) | | of unmetamorphosed layered intrusions (Busveld Complex, South Africa and Great Dyke, Zimbabwe) ∼ 30 to...Zimbabwe, and the Merensky Reef of the Bushveld Complex, South Africa, primary igneous silicate minerals...sills, and hence the reef BMS could have a more complex crystallization history than the subvolcanic sills...present, these are both sulfarsenides. 3.4. Bushveld Complex, Merensky Reef We have performed a detailed study...study across the Merensky Reef of the Bushveld Complex at Rustenburg Mine (Godel et al., 2006; Godel et |  | | Journal (article/letter/editorial) | | mineralization may either be the product of a complex polyphase mineralizing process, reflecting a combination...from pyroclastic flows, fall or surges. D–E Pyroxenite Pyroxenite is an ultramafic igneous rock consisting...rising contents of Fe and Mg. Ultrabasic rocks (pyroxenite, peridotite, and dunites) average 2000 ppm Cr...gold-bearing quartz veins in the southern Para State, Brazil (Angelica et al., 1997). Chromium muscovite named...conglomerate-hosted U deposits of the Randtype at Jacobina, Brazil (pers. com. P. Laznicka). Chromium-bearing garnet | | | Journal (article/letter/editorial) | | mineralization may either be the product of a complex polyphase mineralizing process, reflecting a combination...from pyroclastic flows, fall or surges. D–E Pyroxenite Pyroxenite is an ultramafic igneous rock consisting...rising contents of Fe and Mg. Ultrabasic rocks (pyroxenite, peridotite, and dunites) average 2000 ppm Cr...gold-bearing quartz veins in the southern Para State, Brazil (Angelica et al., 1997). Chromium muscovite named...conglomerate-hosted U deposits of the Randtype at Jacobina, Brazil (pers. com. P. Laznicka). Chromium-bearing garnet |  | | Book | | elements (PGE). Using examples from the Bushveld complex of South Africa and other intrusions, this book...Deposits: Examples 2.4.1 The Bushveld Complex 2.4.2 The Stillwater Complex 2.4.3 Skaergaard Intrusion 10 10...1 Silicate Liquid Inclusions in the Stillwater Complex 7.2.2 Other Examples of Silicate Liquid Inclusions...Inclusions 7.3.1 Fluid Inclusions in the Stillwater Complex 7.3.2 Fluid Inclusions and Hydrosaline Melt Inclusions...Ultramafic Pegmatoids and Pipes of the Bushveld Complex 8.4 Bushveld Plutonic Diatreme 8.5 Existing Bushveld |  | | Book | | Basement to the Shetland Ophiolite-complex 4 The Shetland Ophiolite-complex and Skaw Granite Information...geology of the basement to the Shetland Ophiolite-complex 26 Structure of the Valla Field and Lamb Hoga blocks...Saxa Vord Block 34 Six The Shetland Ophiolite-complex Introduction 37 The ophiolite nappes 37 The imbricate...Shetland Ophiolite-complex: tectonics and origins 92 A model for the Shetland Ophiolite-complex 92 Nine Cenozoic...Diagrammatic section through the Shetland Ophiolite-complex parallel to the restored Lamb Hoga Fault 7 5 Idealised |
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