Nicholas Arndt, C. Michael Lesher, Steve J. Barnes
Komatiites erupted billions of years ago as pulsating streams of white-hot lava. Their unusual chemical compositions and exceptionally high formation temperatures produced highly fluid lava that crystallized as spectacular layered flows. Investigation of the extreme conditions in which komatiites formed provides important evidence about the thermal and chemical evolution …
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Contrasting komatiite belts, associated Ni–Cu–(PGE) …
Ore-genesis models have traditionally emphasised the role of crustal assimilation as a key factor in nickel sulfide ore-forming processes in komatiites (Lesher & Arndt 1995; Lesher et al. 1999, 2001; Barnes et al. 2004).
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(PDF) Komatiites and nickel sulfide ores of the Black Swan …
The low sulfide content of the immediately overlying olivine cumulates is in contrast to the situation commonly thought to be typical of komatiites-hosted massive ores such as Alexo, (Barnes and Naldrett 1986; Naldrett 1973) and some of the Kambalda deposits (Cowden 1986), where massive ore is overlain by a thickness of matrix or net-textured ...
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Trace-element geochemistry and petrogenesis of barren and ore …
BARREN AND ORE-ASSOCIATED KOMATIITES Alteration Interpretations of the extent of contamination by crust and of depletion in chalcophile elements in komatiites are complicated by the effects of alteration (e.g., Donaldson 1981, McGoldrick & Keays 1981, Beswick 1982, Gruau et al. 1992, Arndt et al. 1989, Lesher & Arndt 1995, Lahaye et al. 1995 ...
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(PDF) Komatiites and nickel sulfide ores of the Black Swan …
Komatiites and nickel sulfide ores of the Black Swan area, Yilgarn Craton, Western Australia. ... ore-associated komatiites. Can Miner 39:673–696. 764. Li C, Naldrett AJ, Coats CJA, Johannessen ...
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Komatiites and Ni-Cu-PGE deposits | Geology for Investors
Komatiites (pronounced ko-ma-tee-ites) are an unusual and very ancient volcanic rock. They are interesting to geologists for their unique "spinifex" texture, their exceptional chemical composition and the high-temperature conditions of their formation. They are also host to a significant portion of world nickel production. Wi…See more on geologyforinvestors
Komatiite-hosted Ni–Cu–PGE deposits of the Kambalda …
These volcanic and stratigraphic variations define elongate prisms of distinctive komatiite flow sequences, and imply a strong volcanic control on ore localization (Gresham and Loftus-Hills, …
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TRACE-ELEMENT GEOCHEMISTRY AND PETROGENESIS OF BARREN AND ORE
Most komatiite-associated magmatic Ni–Cu–(PGE) sulfide deposits formed from sulfide-undersaturated magmas and are interpreted to have formed in dynamic lava channels or magma conduits by incorporation of crustal sulfur. They commonly exhibit geochemical and isotopic evidence of crustal contamination and chalcophile element depletion on the scale of …
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The role of komatiitic and picritic magmatism and S …
Komatiitic and picritic magmas are S-undersaturated because they are high temperature magmas produced by large degrees of partial melting of upper mantle sourc …
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(PDF) PGE Geochemistry in Komatiites and Basalts: Indicators of Ore
The results of this study confirm that the PGE geochemistry of komatiites and basalts is a powerful indicator of sulfide saturation and ore-forming processes, but that it must be interpreted within the context of physical volcanological and fluid dynamic processes. 1 INTRODUCTION AND PROBLEM IDENTIFICATION Identifying the spatial and genetic ...
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What are the most important ore deposits in Komatiites?
I want to know more about ore deposits in Komatiites. Share . Facebook. Twitter. LinkedIn. Reddit. Get help with your research. Join ResearchGate to ask questions, get input, and advance your work.
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(PDF) Komatiites and nickel sulfide ores of the …
The low sulfide content of the immediately overlying olivine cumulates is in contrast to the situation commonly thought to be typical of komatiites-hosted massive ores such as Alexo, (Barnes and Naldrett 1986; Naldrett 1973) and …
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The role of komatiitic and picritic magmatism and S …
Semantic Scholar extracted view of "The role of komatiitic and picritic magmatism and S-saturation in the formation of ore deposits" by R. Keays. ... Paleoproterozoic (2.05 Ga) komatiites are widespread in the Central Lapland Greenstone Belt (CLGB), northern Finland. Close association with sulfur (S)-rich country rocks and spatiotemporal …
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Geochemistry of komatiites in the Eastern Goldfields …
The combination of abundant thick cumulate-rich komatiite units and widespread crustal contamination in the EGS can be attributed to a predominance of rapid, high volume eruptions, …
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(PDF) And Ore-Associated Komatiites
Most komatiite-associated magmatic Ni–Cu–(PGE) sulfide deposits formed from sulfide-undersaturated magmas and are interpreted to have formed in dynamic lava channels or magma conduits by incorporation of crustal sulfur. They commonly exhibit
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(PDF) Re-Os systematics of komatiites and komatiitic basalts …
Chromite separates were obtained by crushing whole rock samples using a ceramic jaw crusher, followed by separation of the ferromagnetic (magnetite) fraction using a hand magnet. ... Keays R. R., Barnes S. J., and Hulbert L. (2001) Trace element geochemistry and petrogenesis of barren and ore-associated komatiites. Can Mineral. 39, 673– 696 ...
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Re-Os isotopic evidence for genesis of Archaean nickel …
the ore-forming komatiites were derived from the upper mantle without significant contamination by radiogenic crust either before eruption or during turbulent flow at the surface. Thus, ground ...
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TRACE-ELEMENT GEOCHEMISTRY AND PETROGENESIS …
BARREN AND ORE-ASSOCIATED KOMATIITES 675 O'Hara 1998, Lesher et al. 1999, Sproule et al., submitted). The high Mg contents of aphyric and random spin-ifex-textured komatiites (up to 30% MgO in many areas) and the high Fo content of relict igneous olivine (up to Fo94 in many areas) require derivation from a mantle source.
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Komatiite-Hosted Nickel-Copper Mineralization …
Detailed mapping at the trench-scale (Figure 5.2) reveals the complexity of interaction between the interlayered komatiites and sedimentary rocks. Peperitic, variolitic, and brecciated contact …
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TRACE-ELEMENT GEOCHEMISTRY AND PETROGENESIS OF BARREN AND ORE
The amounts of contamination and chalcophile element depletion produced during the ore-forming process depend on several factors: 1) the stratigraphic architecture of the system (e.g., thickness and physical accessibility of the contaminant), 2) the fluid dynamics and thermodynamics of the lava or magma, 3) the physical, chemical, and thermal ...
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(PDF) Petrology, geochemistry and petrogenesis of Al
Petrology, geochemistry and petrogenesis of Al-depleted komatiite from Badampahar-Gorumahisani Greenstone Belt of Eastern Iron Ore Group, Singhbhum Craton, India March 2017 Indian Journal of ...
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(PDF) Komatiites: their geochemistry and origins
Ti-enriched komatiites and post-Archaean komatiites were produced by smaller degrees of melting of variably enriched or depleted sources, with melting conditions comparable to those of modern ...
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Komatiites and Ni-Cu-PGE deposits | Geology for Investors
Type 1 deposits are sulfide-rich accumulations of "massive" ore, containing 75- of the sulfides and/or the "matrix" ore, containing 30-70% of olivine crystals with dispersed sulfides. Rich massive ore (fig. 2) is normally overlain with less rich matrix ore, which is itself is overlain with low-grade sulfide layers.
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Petrography and geochemistry of Mesoarchaean komatiites …
DOI: 10.1016/J.JAFREARSCI.2014.09.014 Corpus ID: 129330894; Petrography and geochemistry of Mesoarchaean komatiites from the eastern Iron Ore belt, Singhbhum craton, India, and its similarity with 'Barberton type komatiite'
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Komatiite from Eastern Iron Ore Group, Singhbhum Craton, …
In this paper, the field, petrographic and geochemical data of Patka komatiite belonging to the Badampahar Group of rocks in the Badampahar Gorumahisani Greenstone Belt of the eastern Iron Ore Group of the Singhbhum Craton are presented for the first time which is mapped to the south of Patka village, Jharkhand. It is showing a similar history of sedimentation and …
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