The focus will be on iron deposits and various types of deposits containing Fe oxides and Cu sulphides in different proportions which generally have some characteristics in common with the IOCG style In particular ore fluid characteristics magmatic versus non magmatic and new geochronological data are used to link the ore forming processes
Based on a critical assessment of the literature a new integrated model for the Carajas Neoarchean IOCG deposits The model considers the hydrothermal alteration footprint and the rock textures the geometry of the mineralization and the ore assemblage and
Ore forming fluids in IOCG deposits are not merely NaCl H 2 O systems leading to hardly determine their salinity via microthermometry fluid inclusions LA ICP MS trace element analysis has the advantages of in situ real time high spatial resolution and high fidelity The micro analysis of a single fluid inclusion can obtain more accurate
1 Introduction The research on the origin and evolution of crustal fluids involved with ore deposits is crucial for improving the knowledge of metasomatic and ore forming processes in different geological terrains Heinrich and Candela 2014 Iron oxide copper‑gold IOCG deposits are important global reservoirs of base and precious metals such as Cu and
Evolution of the Igarap Bahia Cu Au deposit Carajás Province Brazil Early syngenetic chalcopyrite overprinted by IOCG mineralization Ore Geology Reviews IF Pub Date 2019 07 02 DOI /
Iron oxide copper gold IOCG deposits are major sources of Cu contain abundant Fe oxides and may contain Au Ag Co rare earth elements REEs U and other metals as economically important byproducts in some deposits They form by hydrothermal processes but the source of the metals and ore fluid s is still debated
مطحنة ساموراي الجديدة لطحن التوابل و البهارات و خلافة بتكة زرار تصميم عصري إنسيابي يناسب الذوق العام خزان بغطاء تبقي شايفة اللي جواها
Type 1 CDR process is possibly induced by the changing fluid composition and/or decreasing temperature during progressive alteration and ore formation whereas type 2 CDR process can be interpreted as post ore replacement due to a new pulse of magmatic
Textural evidences show that the apatite grains have been precipitated during the potassic alteration of the D 2 event Ga which is considered a regional IOCG related high temperature event Cathodoluminescence textures reveal that all the apatite occurrences have been chemically modified by the late stage metasomatic and ore forming fluids during the
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Sources of Ore Fluid Components Patrick Williams et al 3 and mineralisation Mark et al 2006; Monteiro et al 2008 Carbonates are commonly abundant and where present in magnetite