 | | Journal (article/letter/editorial) | | Deposits of the Bacuri Mafic-Ultramafic Layered Complex, Guyana Shield, Amapá State, Brazil CARLOS ALBERTO...Brasileiras Reunidas, Av. de Ligação 3000, Nova Lima, MG, 34000-000, Brazil AND CESAR FONSECA FERREIRA FILHO...70910-900, Brazil Abstract The chromite deposits of the Bacuri mafic-ultramafic layered complex consist...largest reserves of chromite in Brazil. The complex is a major stratiform complex overprinted by ductile deformation...terranes of the Guyana Shield. The Bacuri mafic-ultramafic complex consists of a lower mafic zone (>500 |  | | 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) | | Pará, Brazil Laboratório de Geologia Isotópica-Pará-Iso, IG-UFPA, 66075-110, Belém, Pará, Brazil a r...Shield, northeast Amazonian Craton, in the north of Brazil, is part of a widespread orogenic belt developed...reworked during the Transamazonian orogeny, named Amapá Block. It consists mainly of a high-grade metamorphic...metamorphic granulitic-migmatitic-gneiss complex, of Meso- to Neoarchean age and Rhyacian granitoids and supracrustal...during the formation of rocks that today make up the Amapá Block. Hf-TCDM model ages, ranging from 2.99 Ga |  | | 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 |  | | 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...bodies in the Rio Jacaré intrusion of northeastern Brazil. The intrusion hosting these magnetite bodies consists...Companhia Baiana de Pesquisa Mineral, Salvador, Brazil) † Corresponding author: e-mail, Prichard@cardiff...south-central part of Bahia state in northeastern Brazil (Fig. 1) and lies within the São Francisco craton |  | | 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 |  | | Journal (article/letter/editorial) | | mineralization may either be the product of a complex polyphase mineralizing process, reflecting a combination...accessory minerals are apatite, cancrinite, calcite, titanite and melanite–garnet. It is the plutonic analogue...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...intrusions of Archaean age such as the Bushveld Complex, South Africa. Stratiform Cr deposits account for | | | Journal (article/letter/editorial) | | mineralization may either be the product of a complex polyphase mineralizing process, reflecting a combination...accessory minerals are apatite, cancrinite, calcite, titanite and melanite–garnet. It is the plutonic analogue...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...intrusions of Archaean age such as the Bushveld Complex, South Africa. Stratiform Cr deposits account for |
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