| | Journal (article/letter/editorial) | intrusions in the Andriamena region, north-central Madagascar G.M. Bybee â, L.D. Ashwal, A.H. Wilson School...online 7 March 2010 Editor: R.W. Carlson Keywords: Madagascar platinum group elements ruthenium AlaskanâUralian...paragneisses in the Andriamena region of north-central Madagascar fall within the domain of a 900-km-long belt...arc is reported to extend from north-central Madagascar through the Seychelles into India. The ultramaïŹc...harzburgites, lherzolites and websterites of the Lavatrafo body show enrichment in the Pd-group PGEs with | | | Journal (article/letter/editorial) | in ultramafic complexes at western Andriamena, Madagascar I. McDonald* Small (,2 km diameter), ultramafic...intrusive complexes in the Andriamena region of Madagascar carry high concentrations of platinum-group elements...olivine. The discovery of these sperrylite (PtAs2), irarsite (IrAsS) and hollingworthite (RhAsS) inclusions...liquidâolivineâsulphide liquid into the dyke-like Lavatrafo intrusions. The high As content of the sulphide...Arsenides, Ultramafic complexes, Andriamena, Madagascar Introduction Geochemical exploration carried | | | Journal (article/letter/editorial) | at the Ranomena mine, Toamasina chromite district, Madagascar Giovanni Grieco â, Anna Merlini, Alberto...group elements Platinum group minerals Chromitite Madagascar a b s t r a c t This paper presents new data...mine in the North Toamasina chromite district of Eastern Madagascar. Such data can provide an insight on...the differences with other chromite deposits of Madagascar. Chromitite host rocks are harzburgite and pyroxenite...Elsevier B.V. All rights reserved. 1. Introduction Madagascar has never been a platinum-group-element (PGE) | | McDonald, I., Ohnenstetter, D., Ohnenstetter, M., Vaughan, D. J. (1999) Palladium oxides in ultramafic complexes near Lavatrafo, Western Andriamena,
Madagascar. Mineralogical Magazine, 63 (3) 345-352 doi:10.1180/002646199548565 | Journal (article/letter/editorial) | in ultramafic complexes near Lavatrafo, Western Andriamena, Madagascar ]L. MCDONALD 1" , D. OHNENSTETTER...intrusive complexes in the Andriamena region of Madagascar contain zones with disseminated chromite and...palladium, oxygen, hydrated oxides, Andriamena, Madagascar. Introduction GEOCHEMICALexploration carried...mafic intrusive complexes near Lavatrafo in the Andriamena region of Madagascar (Fig. 1) contain high concentrations...and drilling have shown that dunites within the Lavatrafo UM2 and UM3 ultramafic complexes defined by Salp6teur | | Uysal, Ibrahim, Zaccarini, Federica, Sadiklar, M. Burhan, Bernhardt, Heinz-JĂŒrgen, Bigi, Simona, Garuti, Giorgio (2009) Occurrence of rare Ru-Fe-Os-Ir-oxide and associated Platinum-group minerals (PGM) in the chromitite of MuÄla ophiolite, SW-Turkey. Neues Jahrbuch fĂŒr Mineralogie - Abhandlungen, 185 (3) 323-333 doi:10.1127/0077-7757/2009/0131 | Journal (article/letter/editorial) | (5), Ru-Fe-Os-Ir-oxides (4), Pt-Fe alloy (1) and irarsite, ideally IrAsS, (1), and form crystals of variable...Os-Ir: Os-Ir alloy, Pt-Fe: Pt-Fe alloy, Irar: Irarsite. 13.51 2.52 47.50 0.82 0.00 0.01 0.00 0.25 0...(20), Os-Ir-Ru alloy (12), Pt-Fe alloy (2) and irarsite (2) (Fig. 4b). Their size ranges between 20 and...Pd-oxides found in the ultramaïŹc complex of Lavatrafo (Madagascar) replaced a precursor Pd-bearing PGM and...concentrates of the Antanambao-Manampotsy area, Madagascar. â Comptes-rendus de lâAcadĂ©mie des Sciences | | | Journal (article/letter/editorial) | (PtAsS-RhAsS), hollingworthite-irarsite (RhAsS-IrAsS) and irarsite (IrAsS; Table 5; Fig. 8). The majority...Great Dyke (Coghill and Wilson 1993), Lavatrafo AC Complex, Madagascar (McDonald 2008) and Sudbury (Dare...IPGE-rich species (e.g., erlichmanite, laurite and irarsite; Table 5). This is consistent with podiform chromitites...the Muldersdrif Ultramafic Complex, Krugersdorp Districtâ. Trans. Geol. Soc. S. Afr. 81, 193â203 Anhaeusser...Surrounding Archaean Volcanic Rocks, Krugersdorp Districtâ. Transactions of the Geological Society of South | | Kozlu, Hatice, Prichard, Hazel, Melcher, Frank, Fisher, Peter, Brough, Christopher, Stueben, Doris (2014) Platinum group element (PGE) mineralisation and chromite geochemistry in the Berit ophiolite (Elbistan/KahramanmaraĆ), SE Turkey. Ore Geology Reviews, 60. 97-111 doi:10.1016/j.oregeorev.2013.12.011 | Journal (article/letter/editorial) | inclusions in chromite and some of the laurite and irarsite were investigated. Analytical details are given...made for laurite, members of the hollingworthiteâirarsiteâplatarsite solid solution series, PGE alloys,...investigated chromitites (Table 3, Fig. 6C). Palıtlı irarsite and erlichmanite. The PPGMs in Berit are PtâRh-bearing...sulpharsenides belonging to the platarsite/hollingworthite/irarsite solid solution series, PtâPd base metal alloys...052 0.152 0.075 0.174 0.035 wt.% Laurite Irarsite S Fe Ni As Ru Rh Os Ir Pt Total At. % S Fe Ni | | Mota-E-Silva, Jonas, Prichard, Hazel M., SuĂĄrez, Saioa, Ferreira Filho, Cesar F., Fisher, Peter C. (2016) Supergene Alteration of Platinum-Group Minerals and the Formation of Pd-Cu-O and Pd-I-O Compounds In the Limoeiro Ni-Cu-(PGE) Deposit, Brazil. The Canadian Mineralogist, 54 (3) 755-778 doi:10.3749/canmin.1500049 | Journal (article/letter/editorial) | (Mrk), sperrylite (Spy), hollingworthite (Hlw), irarsite (Irs), violarite (Vio), pyrite (Py), goethite...Within this group of PGM, sperrylite (PtAs2), irarsite [(Ir,Pt,Rh)AsS], and hollingworthite [(Rh,Ir,Co...lm2, hollingworthite ranges from 3 to 6 lm2, and irarsite from 6 to 110 lm2. They 763 PLATINUM-GROUP...merenskyite; Spy, sperrylite; Hlw, hollingworthite; Irs, irarsite. occur as euhedral relicts derived from the primary...still represented by voids in the host goethite. Irarsite is also affected by partial fragmentation (Fig | | | Journal (article/letter/editorial) | rutheniridosmine, platinum, laurite, hongshiite, irarsite, cuprorhodsite, iridsite, prassoite, hollingworthite...They are also found included in chromite and in irarsite (cf. Borg, 1997). (3) Lamellae grouped in boxworks...sulpharsenides were observed: laurite (Figs 2d, 4e), irarsite, iridsite, prassoite, erlichmannite and hollingworthite...cementing iridium and osmium lamellae, whereas irarsite is found as crusts around other PGM. Simple PGE-oxides...Country Ethiopia USA USA Colombia Madagascar N. Caledonia Madagascar N. Caledonia Ethiopia USA N. Caledonia | | | Journal (article/letter/editorial) | Bushveld Complex in South Africa, of the Sudbury district in Canada, and later Norilsk in Russia grand style...Bushveld Complex in South Africa, of the Sudbury district in Canada, and later Norilsk in Russia came into...Bushveld Complex in Southfrom Africa, of the Sudbury district in Canada, The 2054.4 [1â3]. ± 1.3-Ma-old [9]...hollingworthite [RhAsS], rarer platarsite [PtAsS], irarsite [IrAsS], and ruarsite [RuAsS]. Antimonides like...], 15% PGE-sulfarsenides (hollingworthite and irarsite), and 5% of other PGM. (Pt,Pd)-bismuthotellurides | | | Journal (article/letter/editorial) | Since the 1930s, plutons of the Monchegorsk ore district have been regarded as nickel-bearing. The first...Paleoproterozoic layered plutons of the Monchegorsk ore district were discovered in the late 1990s. As Corresponding...Keithconnite Telargpalite Sopcheite Zvyagintsevite Irarsite Hollingworthite Platarsite Hessite Pd-bearing...in Ultramafic Complexes near Lavatrafo, Western Andriamena, Madagascar,â Mineral. Mag. 63 (3), 345â352...34. Layered Intrusions of the Monchegorsk Ore District: Petrology, Ore Mineralization, Isotopes, and | | | Journal (article/letter/editorial) | pyrrhotite, chalcopyrite, stibiopalladinite, atokite, irarsite, michenerite, moncheite or AuâAgâCu alloy. An...shallow levels of an ultramafic intrusion in Madagascar (McDonald et al. 1999a). PdâOâH phases with a...PtâFe nuggets from alluvial deposits in eastern Madagascar. Can. Mineral. 30, 983-1004. ________ & ________...in ultramafic complexes near Lavatrafo, western Andriamena, Madagascar. Mineral. Mag. 63, 345-352. ________ | | SuĂĄrez, 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 NiâCu deposit, SW Spain. Mineralium Deposita, 45 (4) 331-350 doi:10.1007/s00126-009-0275-x | Journal (article/letter/editorial) | OsâIrâAsâS (possibly osarsite), IrâAsâS (possibly irarsite) and Ir-Pt-As phases are present (Ortega et al...also described by SalpĂ©teur et al. (1995) in Madagascar. All these authors concluded that Pd is more...mineralogy from ultramafic complexes at Andriamena, Madagascar. Appl Earth Sci (Trans Inst Min Metall) 117(1):1â10...in ultramafic complexes near Lavatrafo, western Andriamena, Madagascar. Mineral Mag 63(3):345â352 McDonald | | Naldrett, A. J., Wilson, Allan, Kinnaird, Judith, Yudovskaya, Marina, Chunnett, Gordon (2012) The origin of chromitites and related PGE mineralization in the Bushveld Complex: new mineralogical and petrological constraints. Mineralium Deposita, 47 (3) 209-232 doi:10.1007/s00126-011-0366-3 | Journal (article/letter/editorial) | (2008) has described PtAs2 (sperrylite), IrAsS (irarsite) and RhAsS (hollingworthite) inclusions in olivine...mafic/ultramafic intrusive complexes near Lavatrafo, Madagascar (Ohnenstetter et al. 1999). Whilst he concluded...in ultramafic complexes at Western Andriamena, Madagascar. Applied Earth Science (Trans Inst Min Metall | | | Book | OsâIrâRu alloys, and minor PdâTe, anduoite, and irarsite in dunite and chromitite of the Xiadong Alaskan-type...(FePt)1âx S, IrâRhâHeazlewoodite (NiIrRh)3 S2 Irarsite IrAsS, Osarsite OsAsS, Ruarsite RuAsS, Hollingworthite...decreasing amounts of OsâIr alloys, As-bearing phases (irarsite), and BM minerals containing detectable amounts...such as tulameenite, CuâPdâPt alloys, potarite, irarsite, geversite, tolovkite, unknown RhâTe (Table 2)... cuprorhodsite, unnamed Ir and Ni sulïŹde, and irarsite. (I) Bi-phase PGM composed of osmium and ruthenarsenide |
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