 | | Journal (article/letter/editorial) | | vysotskite and keithconnite from the Freetown Layered Complex, Sierra Leone J. F. W. Bowles Mineral Science...Pt-Fe nuggets of the Freetown Intrusion, Sierra Leone contain many included platinum-group minerals (PGM)...aus dem Freetown Komplex, Sierra Leone 76 J. F. W. Bowles Die Pt-Fe-Nuggets der Freetown-Intrusion...Freetown-Intrusion, Sierra Leone enthalten eine Vielzahl von Platingruppenmineralen (PGM) als EinschluĂsse. Hier handelt...Introduction The platinum-group minerals (PGM) of the Freetown Intrusion, Sierra Leone are known to occur |  | Chalokwu, Christopher I., Armitage, Allan E., Seney, Pamela J., Wurie, Chenoh A., Bersch, Michael (1995) Petrology of the Freetown Layered Complex, Sierra Leone: Part I. Stratigraphy and Mineral-Chemical Evidence for Multiple Magma Injection. International Geology Review, 37 (3) 230-253 doi:10.1080/00206819509465402 | Journal (article/letter/editorial) | | com/loi/tigr20 Petrology of the Freetown Layered Complex, Sierra Leone: Part I. Stratigraphy and Mineral-Chemical...Bersch (1995) Petrology of the Freetown Layered Complex, Sierra Leone: Part I. Stratigraphy and Mineral-Chemical...rights reserved. Petrology of the Freetown Layered Complex, Sierra Leone: Part I. Stratigraphy and Mineral-Chemical...Geological Surveys, Ministry of Mines, Freetown, Sierra Leone Downloaded by [University of California...35487 Abstract The Freetown layered complex, located on the western coast of Sierra Leone, is a rift-related |  | Bowles, J. F. W., Lyon, I. C., Saxton, J. M., Vaughan, D. J. (2000) The Origin of Platinum Group Minerals from the FreetownIntrusion, Sierra Leone, Inferred from Osmium Isotope Systematics. Economic Geology, 95 (3) 539-548 doi:10.2113/gsecongeo.95.3.539 | Journal (article/letter/editorial) | | 539â548 The Origin of Platinum Group Minerals from the Freetown Intrusion, Sierra Leone, Inferred from Osmium...Kingdom Abstract The origin of certain alluvial platinum-group mineral (PGM) grains is controversial, with...isotope ratios in PGM grains from the Freetown peninsula in Sierra Leone using an ion microprobe. Indirect...alluvial PGM grains that have been studied, the Freetown ones are distinguished by 187Os/188Os ratios that...two Os-Ru-Ir alloy inclusions within a single platinum-iron alloy host which have 187Os/188Os ratios |  | | Journal (article/letter/editorial) | | PGM grains associated with the Freetown Layered Complex, Sierra Leone, and their origin Keiko Hattori...Abstract. Osmium isotope ratios for two types of platinum group mineral (PGM) nuggets of eluvial (residual)...(residual) origin, associated with the Freetown Layered Gabbro Complex, were determined in-situ using an ion...systematic mineralogical and chemical changes of the Complex and extensive granulitization in the adjacent host...depositional environments. Introduction The origin of platinum nuggets is controversial. Proposed models for |  | AugĂŠ, Thierry, Gloaguen, Ăric, Chevillard, Matthieu, Bailly, Laurent (2018) Mineralogy, geochemistry and emplacement of the Conakry Igneous Complex, Guinea: implications for the NiâCuâPGE mineralization. Mineralogical Magazine, 82 (3) 593-624 doi:10.1180/mgm.2018.79 | Journal (article/letter/editorial) | | geochemistry, and emplacement of the Conakry Igneous Complex, Guinea: implications for the Ni-Cu-(PGE) mineralization...1180/mgm.2018.79. Abstract The Conakry Igneous Complex (CIC) is a mafic-ultramafic intrusion emplaced...contemporaneously with the opening of the Atlantic, forming a complex, 55 x 5 km dyke-like body within which three main...sulfides (BMS) are present in all units of the complex and earlier descriptions have mentioned a âmassive...âmassive sulfide layerâ with 2 to 4 g/t PGE. Platinum-group minerals (PGM) are almost everywhere included |  | Bowles, J. F. W., Prichard, H. M., Suarez, S., Fisher, P. C. (2013) THE FIRST REPORT OF PLATINUM-GROUP MINERALS IN MAGNETITE-BEARING GABBRO, FREETOWN LAYERED COMPLEX, SIERRA LEONE: OCCURRENCES AND GENESIS. The Canadian Mineralogist, 51 (3) 455-473 doi:10.3749/canmin.51.3.455 | Journal (article/letter/editorial) | | REPORT OF PLATINUM-GROUP MINERALS IN MAGNETITE-BEARING GABBRO, FREETOWN LAYERED COMPLEX, SIERRA LEONE: OCCURRENCES...University, Cardiff, Wales CF10 3AT Abstract Platinum-group minerals (PGM) have been located in magnetite-bearing...magnetite-bearing gabbroic rocks of the Freetown Layered Complex, Sierra Leone for the first time. The PGM occurrences...the associated silicate minerals and elevated platinum-group elements (PGE) and base metal assays. The...are currently known only from single outcrops. Platinum-group minerals are irregularly distributed through |  | | Journal (article/letter/editorial) | | of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone. 1 John F.W. Bowles1...terraces near York, Freetown Peninsula, Sierra Leone have been examined for their platinum-group mineral (PGM)...primary and placer PGM support the proposal that the Freetown nuggets developed as a result of breakdown of...bowles@manchester.ac.uk Keywords: Platinum-group minerals ⢠Freetown Intrusion, Sierra Leone ⢠Alluvial ⢠Nuggets...Introduction Alluvial PGM in the western hills of the Freetown Peninsula, Sierra Leone, W Africa were first found |  | | Journal (article/letter/editorial) | | sulfides and PtâFe alloys in the Freetown Layered Complex, Sierra Leone John F. W. Bowles 1 & Saioa SuĂĄrez...saprolite from Horizon B of the Freetown Layered Complex contain platinum-group minerals (PGM). The PGM...found in some of the disordered PtâFe alloys. Platinum- and Pd-bearing saprolites have retained the original...some retention of Pd in the deeper saprolite. Platinum and Pd are less concentrated in the upper saprolite...transport of PGE. Keywords Platinum-group minerals . Freetown intrusion . Sierra Leone . Weathering . Mobility |  | | Journal (article/letter/editorial) | | isoferroplatinum nugget from the Freetown Layered Complex, Sierra Leone. John F.W. Bowles1, Saioa SuĂĄrez2...Inclusions of platinum-group minerals (PGM) within alluvial isoferroplatinum nuggets from the Freetown Peninsula...Peninsula, Sierra Leone, are aligned with their shape determined by the structure of their host. The edges...features are observed in other nuggets from the same area. The inclusions contain laurite (RuS2), irarsite-hollingworthite...forest cover of the Freetown intrusion. The mineralogical assemblage in the layered gabbros of the intrusion |  | | Journal (article/letter/editorial) | | C14â22 n-Alkanes in Soil from the Freetown Layered Intrusion, Sierra Leone: Products of Pt Catalytic Breakdown...above a platinum-group element (PGE)-bearing horizon within the Freetown Layered Intrusion, Sierra Leone...is unlikely as the n-alkanes are stable. In the Freetown soil, the catalytic properties of the PGE (Pt...Keywords: n-alkanes; platinum; catalyst; soil; humic acid; Freetown intrusion; Sierra Leone 1. Introduction...Introduction The Freetown Peninsula, Sierra Leone consists of a thick (7 km) sequence of layered gabbroic rocks |  | | Journal (article/letter/editorial) | | inclusions within platinum-iron alloy placer grains from the Freetown layered complex; Sierra Leone J. L. C. Stewart...of formation of platinum-group element mineralisation. In particular, where platinum-group mineral (PGM)...of the USA and Canada, in Kalimantan, and in Sierra Leone, osmium isotopes have provided useful insights...associated with the Freetown igneous complex, Sierra Leone, is being investigated. The Freetown intrusion is...anorthosite, four of which are exposed on the Freetown Peninsula and the fifth seen only in a borehole |  | | Journal (article/letter/editorial) | | distinguished career. She collected and studied platinum-group minerals from every continent, except Antarctica...Industrial Research to support her work on recycling platinum from road dust. She was UK Representative and...landmark âGeo-Platinum 87â conference volume in 1988 that did so much to expand platinum-group element...element (PGE) research beyond the narrow confines of layered intrusions and turn it into the broad field of...Cardiff on topics ranging from PGE in ophiolites and layered intrusions, gossan formation and Au mineralization |  | Wilhelm, H. J., Zhang, H., Chen, F. L., Elsenbroek, J. H., Lombard, M., de Bruin, D. (1997) Geochemical exploration for platinum-group elements in the Bushveld Complex, South Africa. Mineralium Deposita, 32 (4) 349-361 doi:10.1007/s001260050101 | Journal (article/letter/editorial) | | Geochemical exploration for platinum-group elements in the Bushveld Complex, South Africa Received: 31...stream sediment and soil samples from the Bushveld Complex, South Africa have revealed enhanced precious metal...activities and the presence of hidden concentrations of platinum-group elements (PGEs) and gold. The economically...hosted by the Upper Critical Zone of the Rustenburg Layered Suite are revealed by a high PGE and Au content...follows the igneous layering of the Rustenburg Layered Suite and is oÂset by the Brits Graben. It is therefore |  | Cabral, Alexandre Raphael, Zack, Thomas, KĂśnig, Stephan, Eickmann, Benjamin, Kwitko-Ribeiro, Rogerio, TupinambĂĄ, Miguel, Lehmann, Bernd (2019) Distinguishing High- from Low-Temperature Platinum Nuggets Through Their Trace-Element Pattern. Economic Geology, 114 (2) 201-206 doi:10.5382/econgeo.2019.4627 | Journal (article/letter/editorial) | | LETTER DISTINGUISHING HIGH- FROM LOW-TEMPERATURE PLATINUM NUGGETS THROUGH THEIR TRACE-ELEMENT PATTERN Alexandre..., Germany Abstract High- and low-temperature platinum nuggets from two historical localities, ChocĂł...compared with respect to trace elements. Supergene platinum nuggets from CĂłrrego Bom Sucesso are enriched...have fractionated platinum group element patterns, in comparison with magmatic platinum nuggets from ChocĂł...There has been recurrent interest in the origin of platinum nuggets found in alluvial deposits and lateritic |  | Prichard, Hazel M., SuĂĄrez, 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) | | PLACER PLATINUM-GROUP MINERALS IN THE SHETLAND OPHIOLITE COMPLEX DERIVED FROM ANOMALOUSLY ENRICHED PODIFORM...saioa.suarez@ehu.es Abstract. Highly anomalous platinum-group element (PGE) concentrations in the podiform...ophiolite complex have been well documented previously. The focus of this study is alluvial platinum-group...ophiolite complex, Cliff, Harold's Grave, alluvial concentrates, platinum-group minerals, platinum-group...the entrance and exit of the first two ponds. This area is largely covered by vegetation; it has a 10 cm | | | Journal (article/letter/editorial) | | horizons from the Transdanubian Mountain Range (western Hungary): genetic implications S147 ALKIS KONTONIKAS-CHAROS...of the alluvial platinum-group minerals of the Freetown Layered Complex, Sierra Leone S223 O. V. KARIMOVA...hydrothermal alteration of carbonatite in the Fen Complex, Norway: mineralogy, geochemistry, and implications...P7B 5E1, Canada p. a. williams, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia...hydrothermal alteration of carbonatite in the Fen Complex, Norway: mineralogy, geochemistry, and implications |  | | Journal (article/letter/editorial) | | Os-isotope study of platinum-group minerals in chromitites in Alpine-type ultramafic intrusions and the...mechanical processes. KEYWOROS: osmium isotopes, platinum-group minerals, laurite, chromitites, Borneo,...Indonesia, Malaysia. Introduction Geology of the area THE 1870S/186Os ratios of crustal rocks are much...chromitites of an Alpine-type ultramafic-mafic complex and of PGM from the associated placers on Borneo...Cretaceous crystalline schists. The rocks in the area are highly deformed and segments of different lithologies | | | Journal (article/letter/editorial) | | (Sc), tantalum (Ta), tungsten (W), vanadium (V), platinum group metals (PGM) and the rare earth elements...minerals in Europeâ and contributed to Session 22: âPlatinum-group minerals and accessory minerals: development...hydrothermal alteration of carbonatite in the Fen Complex, Norway: mineralogy, geochemistry, and implications...(Marien et al., 2018). In the Fen carbonatite Complex up to 1.6 wt.% total REE occurs in hydrothermally...horizons from the Transdanubian Mountain Range (western Hungary): genetic implicationsâ. Uranium and REE |  | | Journal (article/letter/editorial) | | minerals Review The Fate of Platinum-Group Minerals in the Exogenic EnvironmentâFrom Sulfide Ores via...Oxidized Ores into Placers: Case Studies Bushveld Complex, South Africa, and Great Dyke, Zimbabwe Thomas...behavior of the platinum-group minerals (PGM) in the weathering cycle in the Bushveld Complex of South Africa...small The worldâs prime sources of platinum-group (PGE) are layered intrusions of Proterozoic crystallites...detrital/allogenic PGM and Archean age (e.g., Bushveld Complex, South Africa; the Great Dyke, Zimbabwe; the Stillwater |  | | Journal (article/letter/editorial) | | SIMON and ISTVĂN DUNKL: The hydrothermal Waterberg platinum deposit, Mookgophong (Naboomspruit), South Africa...RUSSELL GARWOOD, JAMES M. D. DAY and ROY WOGELIUS: Platinum-group element remobilization and concentration...the Cliff chromitites of the Shetland Ophiolite Complex, Scotland 471 HAZEL M. PRICHARD, SAIOA SUĂREZ...JOHN S. WATSON: Placer platinum-group minerals in the Shetland ophiolite complex derived from anomalously...Ophioliterelated associations of platinum-group minerals at Rudnaya, western Sayans and Miass, southern Urals |  | Zaccarini, Federica, Bindi, Luca, Pushkarev, Evgeny, Garuti, Giorgio, Bakker, Ronald J. (2016) Multi-Analytical Characterization of Minerals of the BowieiteâKashinite Series From the Svetly Bor Complex, Urals, Russia, and Comparison With Worldwide Occurrences. The Canadian Mineralogist, 54 (2) 461-473 doi:10.3749/canmin.1500021 | Journal (article/letter/editorial) | | BOWIEITEâ KASHINITE SERIES FROM THE SVETLY BOR COMPLEX, URALS, RUSSIA, AND COMPARISON WITH WORLDWIDE OCCURRENCES...distinctive Raman spectrum and may represent a new platinum-group mineral, although the small size (less than...Rh2S3) and kashinite (ideally Ir2S3), two rare platinum-group minerals (PGM), was postulated by Hansen...ultramaďŹc rocks associated with the Gusevogorskiy Complex in the Urals. Cabri et al. (1981) reported on the...the concentrically zoned maďŹc-ultramaďŹc Gaosital Complex in China. This Rh2S3 phase, however, was ofďŹcially |  | | Journal (article/letter/editorial) | | P7B 5E1, Canada p. a. williams, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia...for gold. Searching for and studying gold and platinum-group minerals provided Hazel with some of her...RUSSELL GARWOOD, JAMES M. D. DAY and ROY WOGELIUS: Platinum-group element remobilization and concentration...the Cliff chromitites of the Shetland Ophiolite Complex, Scotland 471 HAZEL M. PRICHARD, SAIOA SUĂREZ...JOHN S. WATSON: Placer platinum-group minerals in the Shetland ophiolite complex derived from anomalously |  | | Journal (article/letter/editorial) | | School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia School of...School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia a r t i...School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia. E-mail...Pan-African Orogeny, chromite, zinc and platinum in layered maďŹc intrusions were emplaced, for example...g., Mano River in Liberia or Koidu Pipe in Sierra Leone) and gold (e.g., Yatela in Mali) (Markwitz et |  | | Journal (article/letter/editorial) | | Arrhenius equation as a controlling factor of platinum-group mineral formation Athinoula L. Petrou a...complexes and Ural/Alaskan-type intrusions the platinum-group element minerals (PGM) occur as laurite...unclear. Literature data on grain size (r) of platinum-group minerals (PGM) and their formation temperature...activation energy for the formation of IPGM (Irâplatinum-group minerals) was estimated, for the ďŹrst time...Ltd. All rights reserved. 1. INTRODUCTION The platinum-group elements (Ru, Rh, Pd, Os, Ir, and Pt), which |  | | Journal (article/letter/editorial) | | A L O G Y OF THE FREETOWN L A Y E R E D BASIC IGNEOUS COMPLEX OF S I E R R A LEONE A.C. UMEJI Department...Geochemistry and mineralogy of the Freetown layered basic igneous complex of Sierra Leone. Chem. Geol., 39: 17--38...17--38. The northern part of the Freetown tholeiitic layered complex is mapped. This lowermost exposed part...Ni and Zn and enrichment in Sr upward in each layered unit. The abundances of trace elements which are...fractions. The investigation reveals that the layered units are replicas produced by pulses from one |
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