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XIII International Geochemical Exploration Symposium JP/O MM International Geochemical XIII Exploration Symposium JP/O MM Brazilian Geochemical f%Q MM Congress Rio de Janeiro, Brazil October 1-6,1989 Este Volume, como as demais publicações do XIQ IGES e do D CBGii. teve a sua edição coordenada pelo Serviço de Edições Técnicas - SETEC, da Companhia de Pesquisa de a Recursos Minerais - CPRM, com o apoio do Departamento Nacional da Produção Mineral - DNPM A sua impressão foi possível graças ao apoio dos Patrocinadores desse evento. ORGANIZING COMMITTEE General Chairman Administrative Coordinator John M.A. Forman (I.N.B.) Giuseppina Giaquinto de Araújo (CPRM) Co-Chairmen Commercial Exhibit Coordinator Hermes Augusto Verner Inda (CPRM) Oscar Fuller (CPRM) Carlos Oitf Berbert (DNPM) Registration Coordinator Executive Secretary Raymundo J.P. Brim (CPRM) Dorival C. Brum (PETROMISA) Treassurer Technical Coordinators XIIIIGES Rita RedaelK (ENGERIO/C VRD) PaulM.Taufen(WMC) JohnMaddock(UFF) Gregory Moseley (UNANGEM) Facilities Coordinator Technical Coordinator II CBGq Sambasiva R. Patchineelam (UFF) Célia Maria Tinoco (CPRM) Workshop Coordinator Social Program Coordinator Vânia N.A. Mello (CPRM) Carmen LJ». Silveira (PUC) Field Trips Coordinators P.R. Amorim S. Lima (CVRD) Production Editor Dagoberto Drummond (CONSULTANT) Jurema F. da Silva (CPRM) o A publicação deste volume foi patrocinada pela Companhia de Pes­ quisa de Recursos Minerais - CPRM e pelo Departamento Nacional da Produção Mineral - DNPM. O projeto gráfico e a coordenação editorial foi de responsabilidade do Serviço de Edições Técnicas - SETEC, da CPRM Copa: Bernardo Kraus e Fernando Quintino Projeto Gráfico: Jurema Ferreira da Silva, Maria Augusta M. e Silva e Irinéa Barbosa da Silva International Geochemical Exploration, 1:, Rio de Janeiro, 1989. Abstracts. Rio de Janeiro, Sociedade Brasileira de Geoqufmica/ CPRM/DNPM, 1989. 234p. Evento realizado durante o 2? Congresso Brasileiro de Geoqufmica de 1 a 6 de out. 1989. 1. Geoqufmica - Congresso. I. Congresso Brasileiro de Geoqufmica. II. Tftulo CDD 555.093 Foreword Hie Rio'89 Organizing Committee welcomes you to Rio de Janeiro and to the x>mbroed II Brazilian Geochemical Congress and XIII International Geochcmical Ex- pi nation Symposium. This is the first time an international geotohemical symposium has b^n I jld ••> -atin or South America and represents and ideal opportunity for geoscien- tits (rem Brazil and from around the world to compart experiences and exchang; ideas. ' pplied geochemical techniques play a crucial role in effective exploration in Brazilian geologic and weathering environments, and the emphasis placed on geochemrcai expfcra- '.:• <a is reflected by the attendance of over 400 geoscientits at the first Brazilian Geochemi- i. J Congress held 2 years ago. The abstracts contained in this volume comprise contributions from 240 authors representing 34 countries and summarize the "formal" presentations for Rio'89. The abstracts provide a useful means for individual delegates to identify other geosáentitts wit'< sha> wd interests with whom discussion and exchange of ideas can prove rewarding at the "informal" meetings at lunches, coffee breaks, etc during the event. The Organization Committee would like to thank the authors for their contributions to Rio'89 and encourages delegates to take full advantage of this opportunity to meet with dieir geochnmical colleagues. R10'19 Organizing Committee Content XIII INTERNATIONAL GEOCHEMICAL EXPLORATION SYMPOSIUM - XIIIIGES Technical Session Geochernkal Exploration forPrecious Metals and Strategic Metals A Multi-dement and multi-media Approach to Geochemical Exploration for Gold in Eastern Nova Scotia, Canada. 5 Antimony and Arsenic as Pathfinders to Precious Metals Associated with Metasedúnentary-Hosted Mineralization at Morro do Bule, Quadrilátero Ferrffero, Minas Gerais, Brazil. 6 Arsenic, Antimony, Bismuth, Selenium and Tellurium as Pathfinder Elements to Granite-hosted Veintype and Disseminated Gold Mineralization at Cerrito do Pires, Rio Grande do Sul, Brazil. 7 Behaviour of Gold and Other Heavy Minerals in Drainage Sediments Some Implications for Exploration Geochemical Surveys. 8 Deposition and Supcrgcnc Enrichment of the Gold King-Davis Epithermal Precious Metal Lode, Süverton Caldera, San Juan Volcanic Field, Southwestern Colorada, USA. 8 Genesis of Plati.. jm Mineralization at the Gibcllini Mn-V-Ni Deposit, Eureka County, Nevada. 10 Geochemical Exploration in the Central Asian Mountains 10 Geochemical Orientation Survey of Gold-Copper Mineralization at Fhu Thong Í aeng and Phu Tbam Phra, Northeast Thailand. 11 Geochemical Prospecting for Vanadium and Chrome in the Iramaia Sheet, Bahia State, Brazil 12 Geochemical Signatures of Gold Mineralization in Surficial Materials, Earsten Nova Scotia, Canada 14 Gold- HumicSubstance Interactions 15 Lead Isotopes in Exploration for Precious Metal Mineralization Associated with Paleoz \c Volcanic and Sub-volcanic Sequences in Eastern Australia. 16 Magmatic Oxidation as an Indicator of Gold mineralization, Case Study: Kirkland Lake, Ontario 17 Platinum-group Elements in Ophiolite Complexes 17 Potential Use of Lead Isotopes in Explore*ion for Archean Greenstone Deposits in the Red Lake Area, North-Western Omario, Canada 18 Beco—limacc and Follow-up Exploration for Gold ia Ceatral Kalimantan, Indonesia 19 Seasonal Variation m Transport of Goid and Magnetite a Harris Creek: InM^icaricas for Exploration. 19 Some Aspects of Geocheaical Exploration m a New Precious Metal Prospect m Sardinia, Italy. 21 Supergciic Geochemistry and Crystal Morphology of GoIdinaSemiarid WeadKringEaviroomeaLAppbatkwtoGoldEiploratkn. 22 The Behaviour of Platinum Group Elements in the Smficial Environment in Canada. 25 LaUriU Exploration Geochemistry Adsorption of Colloidal Gold Onto Colloidal Iron Oxides. 29 Control of the Distribution of Mn, Co, Zn, Cr, Zr, Ti and Ree During the Evolution of Lateritk Weathering Covers Above Ultramafic Rock Cornplexcs 30 Copper Beliaviour in Lateritk Weathering of Cupriferous ore Deposits in BraziL 32 Geochemkal Evolution of Laterites from two Areas of the Semi-arid Region in Bahia, State, BraziL 33 Geocfaemical Features of the Sn, Zr, Nb and Ree Bearing Lateritic Profile from "Serra do Madeira"-Pitinga (AM) 34 Gold Distribution and Mobility in the Carajás Region, BraziL 37 Ni-richChy Minerals in Lateritic Profile at Niquelândia, Goiás, BraziL 38 Proterozok Lateritic Profiles: Weathering Heritages and Diagenctk ReequUibration. 39 Study of Supergenic Behaviour of Nickel and Some Practical Consequences. 40 Supergene Dissolution and Dispersion of Gold Particles in Lateritic Profiles and Equatorial Rain Forest Conditions 42 The Development of Platinum-Group Elements in Laterites. 42 Weathering and its Effect Upon Geochemical Dispersion at the Porymetalhc Wagga Tang Deposit, New South Wales, Australia 43 Technical Session Lithogeochemistry Distribution of Fluorine in Granitic Rocks Associated with Fluorine Mineralization in Korea and its Potential as a Pathfinder Element in Lithogeochemistry. 43 Fluid Inclusion Studies as Tools in Mineral Exploration of Tin and Tungsten Deposits Associated with the Hercynian Granites of Western Spain 48 Geocnemical Characteristics of the Q7ofite-Tm-Bearmg Granites from the Piling» Mine, Northwestern Brazil - A Review. 49 GeocaemisUyofEkineatsofÜieIronFamUy(Fe>Mii,Ti,Cr>Ni,V) in the Jurassic Deposits of the Afghano-Tadjik Depression. 52 Gwchenusüy of PrecamrxianGrankoidsm Relation to Mineralization S3 Rare-metal Accumulations - Products of Geochemical and Geotectonic Specialization. S3 Reconnaissance and Detailed Lithogeochemical Exploration for Precious Metal Mmcrali7ation Dugway Mining District, Utah, USA. 54 Rock Chemistry, Fluids Indusino and Remote Sensing Studies as Exploration Took for ore Deposits m Gramtk Bathohus of Calabria, Southern Italy. 55 Rock Geochemistry of an Iron ore Field in the Divrigi Region, Central Anatolia, Turkey. A New Exploration Model for Iron ores in Turkey. 56 The 2 Ga. Peralurmnous Magmatism of the Jacobina - Contendas Mirante Belt (Bahia-Brazil): Geochemistry and MetaDogenic Potential. 57 The Itu, Graciosa -** ° -rra do Carambef Granitoids (States of São Paulo and Paraná, Brazil): I Jthochemkal and Zircon Typology Data. 57 Technical Session Geochemistry of Carbonatites and Rare Earth Metals Geocfaemical and Mineralogical Features of a Re-enp**«t v™* Within the Goudini Carbonarite Complex, Transvaal, out jk nil lc— 61 Geodieinical Exploration on the MaicuniAUuliiK-Uto^ 62 Geologic, Petrografic and Petrochemical Aspects of Angolan Carbonatites 64 High-technology Metals in Alkaline and Carbonatitic Rocks in Greenland: Recognition and Exploration. 66 Rare Metals Element (Ree) Accumulations in the Curitiba Basin (Brazil) 66 The Main Geocbemical Features Carbonatites. 68 The Use of Rare Element Geodiemistry to Discriminate the Latente Derivation in the Gunipi Region (Eastern Amazonia) 69 Technical Session Analytical Techniques - New Developments in Exploration Geochemistry A Combination of Chemical, Physico-chemical and DXRD Methods for the Recognition of Metal-bearing Phases Associated with Iron Oxides/Hydroxides in Latentes 73 Determination of Rare Earth Elements in Geological Samples by Isotope Dilution Mass Spectrometry. 73 Determination of Unam» at the PPT Level by Time-Resolved Laser-Induced SpectFoOooronetry: Applications in the Environment and k» Geological Survey. 74 Novel Pioccdnies for Decomposing Selected Refractory ores from Ghana. 75 Progress in Design and Application of EDXRF-field Laboratories. 75 Sequential
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