 | | Journal (article/letter/editorial) | | sulfides and Pt–Fe alloys in the Freetown Layered Complex, Sierra Leone John F. W. Bowles 1 & Saioa Suárez...and weathered rocks and saprolite from Horizon B of the Freetown Layered Complex contain platinum-group...disordered Cu–(±Pd)-bearing Pt–Fe alloys. The saprolite hosts scarce, smaller (1–3 μm) ordered PtFe and...the saprolite has transported Pt and Pd (and probably Au) in solution down slope into saprolite over...deeper saprolite than in the corestones suggesting some retention of Pd in the deeper saprolite. Platinum |  | | Journal (article/letter/editorial) | | C14–22 n-Alkanes in Soil from the Freetown Layered Intrusion, Sierra Leone: Products of Pt Catalytic Breakdown...(PGE)-bearing horizon within the Freetown Layered Intrusion, Sierra Leone, contains anomalous concentrations...is unlikely as the n-alkanes are stable. In the Freetown soil, the catalytic properties of the PGE (Pt...humic acid; Freetown intrusion; Sierra Leone 1. Introduction The Freetown Peninsula, Sierra Leone consists...consists of a thick (7 km) sequence of layered gabbroic rocks. Platinum-group minerals (PGM) have been located |  | | Journal (article/letter/editorial) | | platinum-group minerals of the Freetown Layered Complex, Sierra Leone. 1 John F.W. Bowles1, Saioa Suárez2...rivers and river terraces near York, Freetown Peninsula, Sierra Leone have been examined for their platinum-group...mineralogy of fresh rocks, weathered rocks and the saprolite, with the alluvial suite shows strongly contrasting...primary and placer PGM support the proposal that the Freetown nuggets developed as a result of breakdown of...Keywords: Platinum-group minerals • Freetown Intrusion, Sierra Leone • Alluvial • Nuggets Introduction |  | Augé, Thierry, Gloaguen, Éric, Chevillard, Matthieu, Bailly, Laurent (2018) Mineralogy, geochemistry and emplacement of the Conakry Igneous Complex, Guinea: implications for the Ni–Cu–PGE 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 “massive...composite Ni-Fe-Cu sulfides. Most PGM grains form complex associations resulting either from exsolution or |  | | Journal (article/letter/editorial) | | isoferroplatinum nugget from the Freetown Layered Complex, Sierra Leone. John F.W. Bowles1, Saioa Suárez2...isoferroplatinum nuggets from the Freetown Peninsula, Sierra Leone, are aligned with their shape determined...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...Keywords: Platinum-group minerals,Freetown Intrusion, Sierra Leone,Alluvial,Inclusions,Neoform. Background |  | Rivera, Javier, Reich, Martin, Schoenberg, Ronny, González-Jiménez, José María, Barra, Fernando, Aiglsperger, Thomas, Proenza, Joaquín A., Carretier, Sebastien (2018) Platinum-group element and gold enrichment in soils monitored by chromium stable isotopes during weathering of ultramafic rocks. Chemical Geology, 499. 84-99 doi:10.1016/j.chemgeo.2018.09.008 | Journal (article/letter/editorial) | | and 29 ppb in a limonitic soil horizon and clay saprolite, respectively. Most soil samples have slightly...processes operating at the cold and humid La Cabaña area are capable of increasing the total PGE and Au contents... of certain soil horizons. Such processes are complex and multivariate but are primarily modulated by...on Cr isotope fractionation. Such processes are complex and may involve several cycles of partial oxidation...2. GEOLOGICAL AND CLIMATIC SETTING The La Cabaña area is located 60 km north-west of the city of Temuco |  | | Journal (article/letter/editorial) | | AUSTRALIAN JOURNAL OF EARTH SCIENCES ELEMENTS Layered intrusions: From petrological paradigms to precious...Bushveld and Rum layered intrusions—Edmond A. Mathez and Rosamond J. Kinzler Layered mafic-ultramafic...Leybourne 297 CHEMIE DER ERDE A unique ore-placer area of the Amur region with high-Hg gold— A.V. Melnikov...constrains magmatic-hydrothermal evolution in complex evolved granite systems: The classic Erzgebirge...Jilongshan Au-Cu deposit and the Baiguoshu prospecting area in SE Hubei Province: A guide for mineral exploration—Bakaramoko |  | | Journal (article/letter/editorial) | | School of Earth and Environment, The University of Western Australia, M004, Crawley, 8 b 9 2050, Republic...Johannesburg, PBag 3, WITS, an 10 11 c 12 Western Australia, Crawley, WA 6009, Australia; Email:...School of Earth and Environment, The University of Western 17 Australia, M004, Crawley, WA 6009, Australia;...and Paleoproterozoic rocks that crop out over an area of approximately 76 4.5 million km2. The craton...domain in the south. In both 78 shields the western portion consists of Archean rocks that are separated |  | | Journal (article/letter/editorial) | | occurrences. They included representatives of layered intrusions, Alaskan-Uralian-(Aldan)-type and alkaline...mafic-ultramafic or gabbroic complexes, or the mafic units of layered intrusions. The “field of complicated substitutions”...characteristic of gabbroic source-rocks (e.g., Coldwell Complex), resulting in a markedly different trend for the...Merensky Reef; Bushveld Layered Complex; South Africa Kapalagulu Layered Intrusion; western Tanzania Tulameen...Tulameen Alaskan-type Complex; British Columbia; Canada Coldwell Alkaline Complex; Ontario; Canada Gal’moenan |  | | Journal (article/letter/editorial) | | (2.55 Ga). The palaeosol is thick, mature and complex, forming carapaces on palaeohills. From base to...thin sericitized zone, which was originally a saprolite. The present in- vestigation revealed that on...ultramafics the same weathering event produced a more complex profile, which is informative about the climate...Geological setting The stratigraphy of the investigated area (Fig. 1 ) is idealized in Fig. 2. The Archaean basement...was deposited on the Archaean basement. In this area, the sequence starts with the Chuniespoort Group: |  | Economou-Eliopoulos, Maria, Laskou, Magdalena, Eliopoulos, Demetrios, Megremi, Ifigeneia, Kalatha, Sofia, Eliopoulos, George (2021) Origin of Critical Metals in Fe–Ni Laterites from the Balkan Peninsula: Opportunities and Environmental Risk. Minerals, 11 (9) 1009 doi:10.3390/min11091009 | Journal (article/letter/editorial) | | described in the Philippines (Taganito/Adlay), in Western Australia (The Murrin Murrin deposit), in New Caledonia...Greece and by extension the Anatolides zone of western Turkey [20,22]. Major deposits show a complete...Parhari deposit of bauxite laterite is located in an area where mafic rocks (diabases) are the dominant rock...lying on serpentinized peridotites, at the Parchari area, in a distance of less than 1 km north of the Profitis...rocks (diabases) are also present in the Parchari area. Minerals 2021, 11, 1009 9 of 31 Figure 5. Selected |  | | Book | | Elemental Geochemistry of the Xiadong Alaskan-Type Complex in the Southern Central Asian Orogenic Belt Reprinted...Ophiolite-Related Placer of the River Bolshoy Khailyk, Western Sayans, Russia Reprinted from: Minerals 2018, 8...Study from the Bolshoy Khailyk Placer Deposit, Western Sayans, Russia Reprinted from: Minerals 2019, 9...Oxidized Ores into Placers: Case Studies Bushveld Complex, South Africa, and Great Dyke, Zimbabwe Reprinted...mineralogy, ore genesis, geochemistry and petrology of layered intrusions and ultramafic-mafic complexes, and involve |  | | Book | | (~65 Ma) Deccan Traps cover 0.5 million km2 of western and central India today (with small outcrops in...oceanic plateaus such as the Ontong Java in the western Pacific, may also be millions of square kilometers...several flows of Deccan basalt. Rajmachi area near Khandala, Western Ghats, India. Such amphitheatrical valleys...vegetation cover, and the resultant landscape. The Western Ghats of India receive large amounts of rainfall...Typical landscape in the high areas in central-western Disko, West Greenland. A thick, monotonous-looking |  | | Journal (article/letter/editorial) | | diffuse reflectance spectroscopy 63(19/20): 3193 layered double hydroxide 63(19/20):3193 nickel 63(19/20):3193...rivers 63(7/8):967 salt enhancement 63(22):3715 saprolite 63(23/24):3939 sedimentary recycling 63(23/24):4037...63(3/4):325 precipitation 63(11/12):1767 reactive surface area 63(16):2337 SANES 63(19/20):3205 sorption 63(3/4):325...63(2):217 organic acids 63(10):1549 reactive surface area 63(10):1549 sorption and growth morphology 63(10):...63(11/12):1635 kinetics 63(11/12):1635 reactive surface area 63(11/12):1635 Goethite adsorption 63(19/20):3003 |  | | Book | | Deposits in Layered Intrusions 57-73 R.G. Cawthorn 4. PGE Deposits in the Marginal Series of Layered Intrusions...Barnes 309-341 CASE HISTORIES 15. Fedorov-Pana layered mafic intrusion, (Kola Peninsula, Russia): approaches...369-390 18. Discovery of the J-M Reef, Stillwater Complex, Montana: the role of soil and silt platinum and...ELEMENT DEPOSITS IN LAYERED INTRUSIONS R. G. Cawthorn INTRODUCTION BUSHVELD COMPLEX UG2 Chromitite Merensky...Merensky Reef STILLWATER COMPLEX GREAT DYKE MUNNI MUNNI INTRUSION SKAERGAARD INTRUSION CONTRASTS AND COMPARISONS |
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