Magmatic Ore Deposits Magmatic ore deposits are those which are formed during crystallization of a magma, deep underground. The host rock for the mineralization can range from ultramafic to felsic. The deposit can consist of massive ores in some cases, a nd disseminations of rare minerals in others Chromite and platinum. Magmatic ore deposits are characterized by their close relationship with intermediate or deep seated intrusive igneous rocks. They themselves are igneous rocks whose composition happens to be of particular value to man. They constitute either the whole igneous mass or a part of it, or may form offset bodies
The Yankee Lode, a small but rich magmatic-hydrothermal vein deposit in eastern Australia, is part of a classic and well-described polymetallic province zoned around the large Mole Granite.. These deposits include for example gold, copper, diamonds, iron, oil, salt, coal and many more. Even the distribution of mineral deposits in Gondwana provides hints for the original configuration of the continents as for example the distribution of the Middle Cambrian orogenic gold provinces in the world
Magmatic deposits are syngenetic in that the ore minerals crystallize from the same liquid that produces the silicate minerals which form the bulk of the intrusive - they crystallize more or less simultaneously as the melt cools. An example is a vein. The first step in the formation of a vein is the fracturing or breaking of rock along a. The origin of these typically discordant ore deposits remains as enigmatic as the magmatic evolution of their host rocks. The deposits clearly have a magmatic origin, hosted by an age-constrained unique suite of rocks that likely are the consequence of a particular combination of tectonic circum-stances, rather than any a priori temporal control
Often ore deposits are classified after examples of their type, for instance Broken Hill type lead-zinc-silver deposits or Carlin-type gold deposits Magmatic ore deposit process with Indian Examples The classification of the type of ore environment sets these apart from other magmatic Ni-Cu-PGE ore deposits, which share many of the same genetic (formational) controls. Kambalda-type ore deposits are distinctive in that the deposition of an immiscible Fe-Ni-Cu sulfide melt occurs within a lava flow channel upon the palaeosurface sulfide required for giant magmatic ore deposits (see for example (7,8)). Sulfide saturation and the generation of economic sulfide mineralisation can also be achieved through other types of contamination. Silica contamination due to the assimilation of felsic country rocks can decrease the solubility of sulfur in a mafic magm
Formation of mineral deposits. Mineral deposits form because some medium serves as a concentrating and transporting agent for the ore minerals, and some process subsequently causes the transporting agent to precipitate, or deposit, the minerals. Examples of concentrating and transporting agents are groundwater, seawater, and magma; examples of precipitating processes are boiling (as in a hot. An ore deposit is one occurrence of a particular ore type. Most ore deposits are named according to their location (for example, the Witwatersrand, South Africa), or after a discoverer (e.g. the Kambalda nickel shoots are named after drillers), or after some whimsy, a historical figure, a prominent person, something from mythology (phoenix.
. A Perspective article analyses the distribution of some diamond, platinum-group element and. All of the major Chinese magmatic sulfide deposits appear to be associated with major thermal events, which are interpreted to occur in a variety of tectonic settings. For example, the Jinbaoshan, and Yangliuping deposits in the Yangtze Block are interpreted to have formed in a continental rift-related tectonic settings associated with mantl This monograph on Magmatic Ore Deposits has resulted from a Symposium held at Stanford University on November 12 and 13, 1966. All except three of the papers that were presented are published in this volume as well as some of the discussion and the summation of the symposium Ore deposits hosted in layered mafic intrusions, e.g., the Bushveld and Stillwater complexes, contain significant quantities of Ni, Cu, Cr, Au and the platinum group elements (PGE: Pt, Pd, Rh, Re, Ir, Ru) 99. The theme of IGCP 427 is Ore-Forming Processes in Dynamic Magmatic Systems. Although there is a vast literature on the general geology and composition of magmatic ore deposits, relatively little has been published on the mechanics of how the deposits form. Project 427 is designed to fill this gap
The majority of ore deposits of both iron and manganese are of sedimentary origin. At present, high-grade iron ore deposits formed by hydrothermal and supergene enrichment of Proterozoic banded iron formations constitute the most important source for iron ores, with only some magmatic and skarn-type iron ore deposits being mined Magmatic Sulphide Deposits provides an updated summary of the state of understanding of the most important Ni sulfide deposits. This book is an enormously expanded and updated version of his original textbook on the subject . provides a wealth of information to the reader in a form that is readily understood by one who is new to the subject In recent years, hydrothermal-magmatic systems in modern volcanism areas have been in focus of researches as ore-generating structures. It is assumed that there is relation between geothermal and epithermal ore deposits (Hedenquist et al., 1996). However, ore formation in the interior of modern hydrothermal-magmatic systems i these deposits show a relatively small range of negative ∆56Fe values (−0.29 to −0.04‰), consistent with high-temperature fractionations in magmatic systems, with the exception of one sample from the Dikoloti Ni-Cu-(PGE) deposit of the Selebi-Phikwe greenstone belt, which shows a more negative δ56Fe value of −0.61‰
Characteristics of high-sulfidation epithermal deposits, and their relation to magmatic fluid / A. Arribas, Jr. Magmatic contributions to low-sulfidation epithermal deposits / S.F. Simmons; Fluid chemistry and isotopic characteristics of seafloor hydrothermal systems and associated VMS deposits : potential for magmatic contributions / C.E.J. de. . Figure 2. Conceptual m odel for styles of magmatic arc epithermal Au -Ag and porphyry Au -Cu mineralizatio Magmatic ﬂuids immiscible with silicate melts: examples from inclusions in phenocrysts and glasses, and implications for magma evolution and metal transport VADIM S. KAMENETSKY AND MAYA B. KAMENETSKY ARC Centre of Excellence on Ore Deposits and School of Earth Sciences, University of Tasmania, Hobart, Tas., Australia ABSTRAC Bárbara Carolina Dressel, Alain Chauvet, Barbara Trzaskos, João Carlos Biondi, Olivier Bruguier, Patrick Monié, Sandro Notto Villanova, José Bazille Newton, The Passa Três lode gold deposit (Paraná State, Brazil): An example of structurally-controlled mineralisation formed during magmatic-hydrothermal transition and hosted within granite.
mixing, for example, the models of Barley et al. (1999) and Taylor et al. (2001) At Carajas, Lobato et al. (2005) have im-plicated magmatic fluids related to deep fault-magmatic systems as being responsible for the upgrading of BIF to hard high-grade hematite ore (see also Lobato et al., 2008) Classifications based on origin that were devised before 1900, except the outline by Vogt in 1893, implied that deep-seated deposits, other than magmatic segregations, were formed wholly or mainly by waters that had descended from the surface, and, after either short and direct or long and devious circulation, during which they dissolved metals and gangue material from country rocks, deposited. This contribution reviews a number of recent advances both from a technological method-development and scientific problem-solving perspective. The focus of this contribution is on multi-trace element analysis for mineral characterisation and petrogenetic interpretation of magmatic-hydrothermal ore deposits High-temperature, late-magmatic deposits, including pegmatite stage deposits, such mobilization of preexisting basement--a type example is the R6ssing deposit of Namibia different types of ore deposits, and the problems in- volved in their use, have been discussed in recent.
. An example is the Hamersley Basin in the Pilbara which hosts most of Australia's known iron ore deposits and resources Kong, Zhigang Wu, Yue Liang, Ting Zhang, Feng Meng, Xuyang Lu, Lin and Yang, G. 2018. Sources of ore-forming material for Pb-Zn deposits in the Sichuan-Yunnan-Guizhou triangle area: Multiple constraints from C-H-O-S-Pb-Sr isotopic compositions. Geological Journal, Vol. 53, Issue. , p. 159. De Souza. Porphyry ore deposits are closely related to sulfate-rich magmatic plutons in convergent margins (1, 2), but where the oxidized S is sourced from remains elusive. One possibility is that the sulfate comes from subducted slab, which, in turn, is derived from oxidized sediments or seawater ( 3 , 4 ) and examples of ore deposits associated with convergent margins Franco Pirajno The classiﬁcation presented is based on magmatic, magmatic-hydrothermal, sedimentary-hydrothermal, non-magmatic, and mechanical-residual processes. Ore deposit:sufﬁcient tonnage and grade to be exploited at a proﬁ Figure 8Compilation of high-precision datasets on several pre-, syn- and post-ore intrusions at magmatic-hydrothermal Cu-Au deposits. Data for Ok Tedi, Bajo de la Alumbrera and Koloula are from Large et al. (2018) Buret et al. (2016) and Tapster et al. (2016), respectively
. Ore Minerals. Image Credits: bonchan/shutterstock Ore Minerals. An ore is a natural occurrence of rock or sediment which contains enough minerals with economically important elements, typically metals, that can be extracted from the deposit economically The results obtained show that the main mass of polysulfide ore at the Talgan deposit was formed beneath the floor of a paleoocean. The ore-forming system was short-lived and its functioning did not give rise to the formation of zonal orebodies. Magmatic fluid played the leading role in mineral formation that porphyry ore deposits are preferentially found in places with thick-ened crust. For example, porphyry copper deposits are commonly seen in continental arcs and continental collision zones but rare in immature island arcs (1). This empirical relationship hints at a link between crustal thickening and high magmatic sulfate contents/S oxi Geological ore deposits are of many different types and occur in all geological environments. The main types of geological ore deposits of importance can be divided into: metallic deposits; non-metallic deposits; fossil fuel deposits; Finding ore deposits. Geologists are always searching for more ore deposits to meet constant demand
Mining of large deposits and prospecting for sepa-rate ore occurrences at deep levels has provided new data on the deep structure of ore-magmatic columns and variation in the mineralization types replacing each other with depth . For example, veinlet-disseminated ores of the porphyry type are localized at relativel magmatic system has on the likelihood of forming an ore deposit. We don't know what mechanisms serve to preferentially concentrate metals in the magmatic system and sometimes we don't even know which magmatic event the observed hydrothermal ores are related to. Answering these questions is fundamental for new geological models of ore formation Magmatic-hydrothermal breccias are very rtant the formation of man (and deposits. Mineralisationin casecan be expected to occur in a sub -vertical body which may be of considerableverticalextent.Lateral zonation of alteration mineralogy around the mineralised may be sufficientlydistinctive to be useful as a guide to ore. There may b
Some ore minerals (minerals of Cr, Ti, Ni, Pt) and apatite become separated during the process of the crystallization of magma and form Magmatic deposits in stratiform complexes. 45. Phreato Magmatic eruptions are volcanic eruptions resulting from interaction between magma and wate Magmatic Ore Deposits: A number of processes that occur during cooling and crystallization of magmatic bodies can lead to the separation and concentration of minerals. 1- Pegmatites 2- Layered intrusions 3- Kimberlites Examples of Magmatic ore deposits: 1- Chromite deposits 2- Nickel - Copper deposits 3- Platinum group metal (PGM) deposits • 1- chromium ore deposits Ores of chromium (Cr.
1 Sulfide-silicate textures in magmatic Ni-Cu-PGE sulfide ore 2 deposits. 1. Disseminated and net-textured ores. 3 (Revision 1) 4 Stephen J. Barnes1, James E. Mungall2, Margaux Le Vaillant1, Belinda Godel1, C. Michael 5 Lesher3, David Holwell4, Peter C. Lightfoot5, Nadya Krivolutskaya6, Bo Wei7 6 1CSIRO Mineral Resources, Perth, Australia; 2Dept of Earth Sciences, University of Toronto Magmatic Ore Deposits. Download full Magmatic Ore Deposits Book or read online anytime anywhere, Available in PDF, ePub and Kindle. Click Get Books and find your favorite books in the online library. Create free account to access unlimited books, fast download and ads free! We cannot guarantee that Magmatic Ore Deposits book is in the library Specific cobalt sulphides, such as linnaeite or carrollite, are generally restricted to remobilised vein deposits. The largest and most economically important magmatic sulphide deposits include: Norilsk, Russia (basal deposit) Merensky Reef, South Africa (stratabound deposits
31 Long-Victor nickel-sulfide deposit located in the world class Kambalda nickel camp in the 32 southern Kalgoorlie Terrane of Western Australia. Results demonstrate that precise multiple 33 sulfur isotope analyses from magmatic pentlandite, pyrrhotite and chalcopyrite can better 34 constrain genetic models related to ore-forming processes Process: Magmatic intrusions result in partitioning of elements and contamination of the melt by assimilation of the host rock. Gravitation segregation of Sulphur result in sulfide ore to form at the bottom of the melt. It is also possible to produce this type of ore through the meteorite impacts, rift/continental flood basalt-associated sills and dykes, volcanic flows and troctolite intrusions While sedimentary iron deposit is associated with sedimentary rocks and to their metamorphic equivalent in case the terrain is metamorphosed, the magmatic iron deposit is associated with basalt and metabasalt. It is also suggested that hydrothermal action can selectively leach out carbonate-silicate metasediments with supergene enrichment of Fe The origin of these typically discordant ore deposits remains as enigmatic as the magmatic evolution of their host rocks. The deposits clearly have a magmatic origin, hosted by an age-constrained unique suite of rocks that likely are the consequence of a particular combination of tectonic circumstances, rather than any a priori temporal control
The Conduits of Magmatic Ore Deposits Nicholas T. Arndt LGCA, UMR 5025 CNRS, BP 53 38400 Grenoble cedex France email@example.com Abstract The magmatic plumbing system plays a crucial role in the formation of ore deposits such as the Ni-Cu-PGE deposits of the Noril'sk-Talnakh region and the chromite-PGE deposits in the Bushveld Complex 1 magmatic ore deposit 2 hydrothermal ore deposit 3 sedimentary ore deposits 4 placer ore deposit 5 residual ore deposit. examples of sedimentary ore deposits. a evaporite deposit b iron formation. evaporite deposit - uniron formation der sedimentary ore deposits, usually occurs in a closed marine environment where evaporation is greater. deposits of El Laco, in northern Chile. Long considered a type-example of magmatic differentiation involving an immiscible oxide melt, the El Laco deposits have many enigmatic features. Amy Larson Rhodes and Naomi Oreskes provide the first detailed field, petrographic, and rare earth element study of the deposits, togethe Share your videos with friends, family, and the worl
Magmatic REE deposits often modified by magmatic-hydrothermal processes (metasomatism) as a result of high volatile contents of magmas resulting in redistributionand/or recrystallization. How are these igneous processes potentially important for ore deposits Lateritic nickel ore deposits, examples include Goro and Acoje, (Philippines) and Ravensthorpe, Western Australia Martite is a pseudomorphous hematite after magnetite. Magnetite is a common heavy mineral in sand. This rock is a metamorphosed sand deposit which seems to be very rich in heavy minerals magnetite (black) and garnet (red). Varanger Peninsula, Northern Norway
1 1 This is a pre-print of 2 Barnes S-J. and Ripley, E.M., 2016.Highly siderophile and strongly chalcophile elements in 3 magmatic ore deposits.In: HIGHLY SIDEROPHILE AND STRONGLY CHALCOPHILE 4 ELEMENTS IN HIGH TEMPERATURE GEOCHEMISTRY AND COSMOCHEMISTRY. 5 Editors J. Havey and J.M. Day Reviews in Mineralogy and Geochemistry 81: 725- 6 774 evidence of dominant magmatic-hydrothermal fluids and origin (Cline et al., 2005; Muntean et al., 2011). Furthermore, the IOCG group of ore deposits is linked for the first time in a fully developed intrusion related model, despite amounts of non-magmatic-external fluids involved in very specifi
ore deposits of the Tintic (Ag-Pb-Zn-Cu-Au) and Bingham deposits? Do they sequester a signiﬁcant portion of the (porphyry Cu-Au-Mo) districts, Utah. The ages, chemical and magmatic Cu, Pb, Zn, Ag, and Au, thereby restricting modal compositions, and ﬁeld relations of the maﬁc alkaline lava Magmatic systems host many types of ore deposits, including world-class deposits of copper and gold. Magmas are commonly an important source of metals and ore-forming fluids in these systems. In many magmatic-hydrothermal systems, low-density aqueous fluids, or vapours, are significant metal carriers rounded magmatic clasts and country rock (siltstone) with a magmatic matrix. Courtesy of Ed Bunker. Background paragraph There is abundant evidence from exploration and mining of porphyry ore deposits that large (>100s of meters) pipes, dikes and irregular bodies of breccia form at kilometers depth, spatially and temporall The latter process may yield zoned ore bodies consisting of Os, Ir, Ru, Rh, Fe, (Ni)-rich monosulphide solid solution (mss) cumulate ore and fractionated sulphide ore rich in Cu, Pt, and Pd. It is possible to model these processes and thereby to estimate the potential of a magmatic body to host economic Cu-Ni-PGE sulphide deposits Sedimentary deposits are formed through the erosion, transportation, and redeposition of minerals that can survive the rigors of transportation. The most common is silica, which forms a number of materials, including silica sand, sand and gravel, and flint. The precursor is igneous quartz (e.g., in granite), and then the sedimentary deposit may undergo metamorphism and recementing to produce.
magmatic iron-titanium oxide deposits, and other iron oxide-bearing hydrothermal deposits, such as many members magmatic wherein the key ore-forming fluid is an immiscible volatile-bearing iron oxide melt. A further possibility, not Phanerozoic examples are numerous and exhibit the same general characteristics as. 14 2. 2 Nickel-copper sulfide ore deposits are found at the base of mafic and ultramafic bodies. All their host rocks, except the Sudbury Igneous Complex, are thought to be mantle derived melts. The Sudbury Igneous Complex is thought to be the product of complete melting of continental crust. In the case of mantle-derived magmas, a high degree of partial melting of the mantle serves to enrich the. Hydrothermal vein deposits are formed when these hydrothermal solutions enter a country rock along cracks and fractures. It precipitates in the parent rock in a vein like structure. The hydrothermal solution in vein deposits can also soak through the country rock which for disseminated ore deposits.This is less concentrated but as formed with the vein together they form economical deposit