Written in EnglishRead online
|Statement||edited by D.L. Buchanan and M.J. Jones.|
|Contributions||Buchanan, D. L., Jones, M. J. 1938-, Institution of Mining and Metallurgy., International Geological Correlation Programme.|
Download Sulphide deposits in mafic and ultramafic rocks
Processes and Ore Deposits of Ultramafic-Mafic Magmas through Space and Time focuses on the fundamental processes that control the formation of ore deposits from ultramafic-mafic magmas, covering chromite, platinum-group element (PGE), Ni-sulfides and Ti-V-bearing magnetite.
The exploration, exploitation and use of these magmatic ores are important aspects of geology and. Magmatic sulfide deposits are sulfide mineral concentrations in mafic and ultramafic rocks derived from immiscible sulfide liquids. A number of schemes exist for subdividing these deposits.
Most are based on the tectonic setting and petrologic characteristics of the mafic and ultramafic rocks (Page and others, ; Naldrett, ), or on the.
Approximately 60 percent of the world’s nickel is produced from Fe-Ni-Cu sulfides found in association with mafic or ultramafic intrusions or flows (Naldrett, ).This includes the Fe-Ni-Cu sulfides found at the margins of the Sudbury Igneous Complex, Ontario, Canada. Most of the rest of Ni production comes from limonitic and saprolitic laterite deposits, which form by weathering of.
Sulfides may also occur as irregular grains in volcanic groundmass or in plutonic rocks. Sulfide liquids in mafic magmas have probably played a role in the formation of certain metal sulfide ore deposits, particularly those associated with layered mafic intrusions or komatiites. The Tulaergen sulfide deposits occur mainly in ultramafic rocks (plagioclase lherzolite and plagioclase olivine websterite), and mafic rocks (gabbro) of this intrusion contain rare sulfide Ni Cu mineralization (Qin et al.,Qin et al., ).Author: Zhen Kang, Ke-Zhang Qin, Ya-Jing Mao, Dong-Mei Tang, Zhuo-Sen Yao.
In summary, magmatic ore deposits associated with mafic-ultramafic rocks occur in a variety of geological settings. The metals of interest occur primarily as sulfide or oxide assemblages. Ni, Cu, and PGE deposits may occur either as sulfide-rich varieties occurring as disseminated, net-textured and massive mineralization, or as PGE-rich, low-sulfide by: 3.
It is common for some mafic-ultramafic intrusions associated with continental flood basalts to host large magmatic Ni-Cu-PGE sulfide ore deposits, such as those within the Permian Siberian large.
Cu-rich massive sulfide deposits associated with mafic–ultramafic rocks in the southern portion of the Main Urals Fault (MUF) are characterized by variable enrichments in Ni (up to wt.%), Co (up to 10 wt.%) and Au (up to 16 ppm in individual hand-specimens).Cited by: The sulfides in magmatic Ni-Cu deposits generally constitute a small volume of the host rock(s) and tend to be concentrated in the lower parts of the mafic and/or ultramafic bodies, often in physical depressions or areas marking changes in the geometry of the footwall topography.
Cu-rich massive sulfide deposits associated with mafic-ultramafic rocks in the southern portion of the Main Urals Fault (MUF) are characterized by variable enrichments in Ni (up to wt%), Co.
Ultramafic-Mafic Intrusions, Volcanic Rocks and PGE-Cu-Ni Sulfide Deposits of the Noril’sk Province, Polar Siberia. Field Trip Guidebook. 12th International Platinum Symposium Book July Ore deposits that are associated with mafic to ultramafic igneous rocks can generally be divided into those where the metals of interest are hosted in oxide minerals and those where the metals of interest are held as sulfides or are strongly associated with sulfides (e.g., PGE alloys, arsenides, bismuthinides).
The oxide ore bodies include stratiform, podiform, and breccia-related chromite, magnetite-rich. The formation of intrusive-hosted Ni sulfide deposits is normally explained by a model whereby (1) metal-rich magmas are generated in the mantle, (2) mantle-derived magma is contaminated during ascent with (sulfide-bearing) crust leading to the formation of an immiscible sulfide melt, (3) entrainment of the sulfide melt in the flowing magma, (4.
Relative va1ue of the contributions of Ni+Co, Cu and PGE to the mag- matic su1fide deposits listed in Table 1. 1 sulfide deposits are closely related to bodies of mafic or ultramafic rock, and the most convenient way in which to consider them is in terms of the type of magma responsible for the rocks with which they are associated.
The nickel sulfide deposits are hosted within the dismembered remnants of a package of deformed ultramafic rocks referred to as the Ntaka intrusion, one of three ultramafic bodies originally documented in the area. The country rocks of the Ntaka intrusion consist of felsic to mafic gneisses and amphibolites, which are interpreted to represent.
Franco Mancini, Heikki Papunen, "Metamorphism of Ni-Cu Sulfides in Mafic-Ultramafic Intrusions: The Svecofennian Sääksjärvi Complex, Southern Finland", Metamorphic and Metamorphogenic Ore Deposits, Frank M.
Vokes, Brian Marshall, Paul G. Spry. Get this from a library. Sulphide deposits in mafic and ultramafic rocks: proceedings of IGCP Projects Third Nickel Sulphide Field Conference: Perth, Western Australia, May, [D L Buchanan; Michael John Jones; International Geological Correlation Programme.
Project ; International Geological Correlation Programme. in magmatic rocks is associated mainly with sulfide (Sudbury, Noril’sk, etc.), sulfide–chromite (Bushveld and analogues) and chromite deposits (mafic-ultramafic.
Get this from a library. Sulphide deposits in mafic and ultramafic rocks: proceedings of IGCP and 91 Third Nickel Sulphide Field Conference, Perth, Western Australia, May [D L Buchanan; Michael John Jones;].
genetic relationships between mafic and ultramafic rocks in the TNB. Furthermore, although it is well established that a fundamental genetic relationship exists between ultramafic intrusions and Ni sulphide deposits in the TNB, it is not known whether any of the more mafic.
Stratabound deposits (fractional crystallisation in large gabbroic magma chambers causes deposition of discrete sulphide layers containing cobalt, nickel, copper and platinum-group minerals) Deposits in extrusive ultramafic rocks (Komatiite flows become sulphur saturated by differentiation and host rock assimilation.
Dense cobalt, nickel and. Volcanogenic massive sulfide ore deposits, also known as VMS ore deposits, are a type of metal sulfide ore deposit, mainly copper-zinc which are associated with and created by volcanic-associated hydrothermal events in submarine environments.
These deposits are also sometimes called volcanic-hosted massive sulfide (VHMS) deposits. The density generally is kg/m 3. Buy Processes and Ore Deposits of Ultramafic-Mafic Magmas through Space and Time (): NHBS - Sisir K Mondal, William L Griffin, Elsevier.
Get this from a library. Nickel sulphide deposits: associated with ultramafic rocks of the Abitibi Belt and economic potential of mafic-ultramafic intrusions. [Paul R Coad]. Further, LIPs are commonly related to a wide variety of metal deposits  including world-class deposits such as magmatic sulfide ore deposits associated with mafic and ultramafic.
The attainment of sulfide saturation of a magma and the separation of immiscible sulfide liquid, together with the presence of an appropriate physical environment for the collection and concentration of the metal-rich sulfide liquid, are key ingredients for the formation of magmatic Ni-Cu-(platinum group element [PGE]) deposits.
Experimental studies of the solubility of sulfur in mafic magmas Cited by: The sulfides in magmatic Ni-Cu deposits generally constitute a small volume of the host rock(s) and tend to be concentrated in the lower parts of the mafic and/or ultramafic bodies, often in physical depressions or areas marking changes in the geometry of the footwall topography.
Search within book. Front Matter. Pages I-XVII. PDF. Introduction. Anthony J. Naldrett Pages Komatiite-Related Deposits. Anthony J. Naldrett.
Pages Ore deposits associated with flood basalt volcanism. Anthony J. Naldrett. Pages Deposits of the Pechenga area, Russia Exploration Mafic/ultramafic rocks Nickel.
Kambalda type komatiitic nickel ore deposits are a class of magmatic iron-nickel-copper-platinum-group element ore deposit in which the physical processes of komatiite volcanology serve to deposit, concentrate and enrich a Fe-Ni-Cu-(PGE) sulfide melt within the lava flow environment of an erupting komatiite volcano.
Get this from a library. Sulphide deposits in mafic and ultramafic rocks: proceedings of IGCP projects third Nickel Sulphide Field Conference, Perth, Western Australia, May, [Dennis L Buchanan; International Geological Correlation Programme. ProjectThe Stillwater Complex, Montana: Geology and Guide.; International Geological Correlation Programme.
She studies mafic and ultramafic rocks and ore deposits asso-ciated with them; platinum-group element deposits, nickel-copper sulfide deposits, chromite, and Fe-Ti-V-oxide de-posits. She also works on developing analytical techniques for analyzing these rocks.
She has been a professor at the Uni-versité du Québec since Cited by: Ultramafic-mafic intrusions, volcanic rocks and PGE-Cu-Ni sulfide deposits of the Noril’sk Province, Polar Siberia.
Field trip guidebook. 12th International Platinum Symposium. Due to the variation of sulphide deposits, it is convenient to relate the magmatic sulphide deposits to the bodies of mafic or ultramafic rock in terms of the composition of the magma associated with these rocks.
It is then reasonable to investigate the geochemical and geophysical setting and the processes in which these deposits are formed. The peridotite and related mafic rocks that have intruded the crust of the earth and are in part exposed at the surface probably have been derived largely from the mantle.
Furthermore, most of the known nickel ore deposits are closely associated with mafic and ultramafic in trusive rocks, and the nickel in the ore bodies was probably derivedCited by: Often thick, magnesite-calcrete caprock, laterite and duricrust forms over ultramafic rocks in tropical and subtropical environments.
Particular floral assemblages associated with highly nickeliferous ultramafic rocks are indicative tools for mineral exploration. Weathered ultramafic rocks may form lateritic nickel ore deposits. 1. Relative va1ue of the contributions of Ni+Co, Cu and PGE to the mag matic su1fide deposits listed in Table 1.
1 sulfide deposits are closely related to bodies of mafic or ultramafic rock, and the most convenient way in which to consider them is in terms of the type of magma responsible for the rocks with which they are : Anthony Naldrett. It is also variably present in Besshi-type volcanogenic massive sulfide and siliciclastic sedimentary rock-hosted deposits in back arc and rift environments associated with mafic-ultramafic rocks.
Metasedimentary cobalt-copper-gold deposits (such as Blackbird, Idaho), iron oxide-copper-gold deposits, and the five-element vein deposits (suchCited by: 1.
Ultramafic (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% Mg O, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content).
The Earth's mantle is composed of ultramafic rocks. On the basis of their principal metal production, magmatic sulfide deposits in mafic rocks can be divided into two major types: those that are sulfide-rich, typically with 10 to 90 percent sulfide minerals, and have economic value primarily because of their Ni and Cu contents; and those that are sulfide-poor, typically with to 5 percent.
Sulphide breccia, which comprises % sulphide and contains cm sized, angular clasts of ultramafic and foliated country rock, also occurs along this contact. The massive sulphide/sulphide breccia varies in thickness from a few centimetres to several metres (maximum 12 m). Abstract.
Cu-rich massive sulfide deposits associated with mafic-ultramafic rocks in the southern portion of the Main Urals Fault (MUF) are characterized by variable enrichments in Ni (up to wt.%), Co (up to 10 wt.%) and Au (up to 16 ppm in individual hand-specimens).Cited by: Sulfide type nickel deposits are formed in essentially the same manner as platinum deposits.
Nickel is a chalcophile element which prefers sulfides, so an ultramafic or mafic rock which has a sulfide phase in the magma may form nickel sulfides.The main sulfide minerals are pentlandite which is nickel sulfide and chalcopyrite which is a copper ion sulfide.
Thirty six percent of global nickel production comes from sulfide deposits of this sort, the remaining 64% comes from nickel laterites which consist of weathered mafic rocks with much of the nickel coming from the crystal lattices of oxidized silicate minerals like olivine because.