Komatiites Crusher
Sulfur isotopes in Archaean crustal reservoirs constrain the …
Assimilation and prolonged suspension of crust-derived sulfide liquid in komatiites are essential to form Ni-rich mineralisation. Evaluating the spatial relationship between komatiite-hosted Ni mineralisation and crustal S sources may thus provide insights into mechanisms of transport, metal enrichment and deposition of assimilated sulfide liquid. This study applied …
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Komatiite-associated Ni–Cu–PGE deposits (by C. M. Lesher …
Komatiite - July 2008. Introduction. There are two main types of ore deposits associated with komatiites: primary magmatic sulfide deposits, mined chiefly for their nickel content with minor by-product Cu and PGEs, and secondary laterite deposits enriched in nickel and cobalt, developed over thick olivine cumulate units, the latter known thus far only in the Yilgarn Craton …
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Review komatiites: from Earth's geological settings to …
Komatiites are not exclusively related to the early Earth, as they may resemble some geological features of other planetary bodies of the Solar System, particularly on Io, and could help us to understand some extraterrestrial volcanisms. Such a prospect opens the idea that komatiites might be more common in the Solar System and also that the ...
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The discovery and petrogenetic significance of komatiites
The discovery of komatiites is important as it gives a window into early Earth processes. The high MgO content (>30 wt%) indicates high liquidus temperatures (c. 1600 …
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Mantle heterogeneity and crust-mantle interaction in the …
1. Introduction. Komatiites are high magnesian, low alkali, predominantly Archean ultramafic extrusive rocks, and are important in understanding the lower mantle processes in early Earth (Arndt et al., 2008; Dostal, 2008; Furnes et al., 2013; Hanski et al., 2001; Le Bas, 2000; Viljoen and Viljoen, 1969).Quenched from very high temperature melts, these rocks provide …
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A brief history of komatiite studies and a discussion of …
Background information – description of the field characteristics, mineralogy and geochemistry of komatiites. 1. A brief history of komatiite studies and a discussion of komatiite nomenclature. …
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(PDF) Pt–Re–Os and Sm–Nd isotope and HSE and REE
For instance, mantle sources of the 2.7 Ga komatiites from the Pyke Hill area in Canada and 2.9 Ga komatiites from the Volotsk area in Fennoscandia had initial e143Nd = +2.9 ± 0.2 and +2.7 ± 0.2, respectively (Puchtel et al., 2004a, 2007), and were derived from sources strongly depleted in light rare earth elements (LREE) and other highly ...
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Komatiites reveal a hydrous Archaean deep-mantle reservoir
This points to a plume origin for komatiites, and high Archaean mantle temperatures — implying the presence of a hydrated mantle reservoir deep in the mantle early …
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(PDF) Komatiites
Komatiites are conventionally considered to be derived from high temperature melts that have eruption temperatures of about 1600°C and are produced by high degrees of anhydrous melting of mantle ...
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Major-Element Series and Types of Komatiites
Some important petrographic and chemical features of peridotitic komatiites (PK) and basaltic komatiites (BK) are reviewed. New chemical data (major elements and Zr, Nb, Rb, Sr, Y, Ba.
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Komatiite
The komatiites of Gorgona Island off the coast of Colombia are the sole well-documented examples of Phanerozoic komatiite. The older, 3.5 Ga old komatiites have different chemical compositions from younger komatiites, being characterized by high CaO/Al 2 O 3 and low Al 2 O 3 /TiO 2.
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Komatiite | PPT
3. o Mostly of komatiite are Archean age o distributed in the Archaean shield areas. o Also a few are Proterozoic and Phanerozoic. o In all ages komatiites are highly magnesium. o Mostly a volcanic rock; occasionally intrusive. o Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal …
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Secular mantle oxidation across the Archean-Proterozoic …
Komatiites in the SDZ experienced greenschist facies metamorphism and relatively minor aqueous alteration, with ∼75% of their olivine phenocrysts preserved ... were cut into slabs, abraded on the cut surfaces using SiC sandpaper to remove saw marks, crushed in an alumina jaw crusher, and finely ground using an alumina shatterbox and alumina ...
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Komatiites reveal a hydrous Archaean deep-mantle …
komatiites and high Archaean mantle temperatures, and evoke a hydrous reservoir in the deep mantle early in Earth's history. We investigated samples of 2.7-billion-year-old komatiites from two
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Physical Volcanology of Komatiites and Ni-Cu-(PGE) …
Although only locally exposed, glacially sculpted exposures of only weakly metamorphosed and mildly deformed komatiites of mineralized and unmineralized komatiites in the Abitibi greenstone belt are among the best in the world, characterized by excellent textural preservation and, in some cases, excellent mineralogical preservation.
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Review komatiites: from Earth's geological settings to …
Williams et al. (2000b) have calculated lava liquid viscosity as a function of lava temperature and composition for several lavas. After comparison, they have found that lunar mare lavas have much lower viscosities (2.3 Pa s at 1,200°C) than modern, terrestrial tholeiitic basalts (53.8 Pa s at …
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Helium in the Archean komatiites revisited: significantly high …
In order to provide constraints on 3 He/ 4 He ratios in the Archean mantle source, we have analyzed helium isotopic compositions in 2.7 Ga old Archean komatiites from the Abitibi green stone belt, Ontario, Canada. Two spinifex-textured komatiites yielded significantly high 3 He/ 4 He ratios of about 30 Ra (where Ra denotes the atmospheric 3 He/ 4 He ratio) in …
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Types of Crushers Explained: Everything You Need to Know
A short-head cone crusher has a short crushing chamber and it is designed for the production of finer output sizes, generally between 6 mm and 25 mm. A fine cone crusher, also known as a tertiary cone crusher, is used for the production of They are manufactured to produce very fine output sizes, mostly below 6 mm.
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Insights into early Earth from Barberton komatiites: Evidence …
The remaining parts of the slabs were polished on all sides using SiC sandpaper to remove saw marks, washed in de-ionized water, dried, and crushed in an alumina-faced jaw …
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Arndt, N., Lesher, C. M. & Barnes, S. J. 2008.
Komatiites are igneous rocks mainly of Archaean age. Their ultramafic origin is controversial and has been attributed to either high degrees of dry melting of peridotite in deep …
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Late-Paleoarchean Ultra-Depleted Commondale Komatiites: Earth…
Komatiites provide insight into Archaean mantle sources and surface processes that were not present in later stages of Earth's evolution. ... The samples were cleaned in an ultrasonic bath with deionized water and crushed in a pure carbon-steel jaw-crusher. The samples (starting weight 200 g) were initially jaw-crushed and following a coarse ...
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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 …
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Komatiites, kimberlites, and boninites
Comparison of key major elements in rocks that crystallized from ultramafic or highly mafic magmas. Figure 1c, MgO versus SiO 2, shows the wide range of SiO 2 in these rocks, from high values in boninites and some komatiites to low values in kimberlites, and Figure 1d shows the range in FeO contents (FeO = total Fe). In Figure 1a, the plotted data are …
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(PDF) On the Classification of Komatiites
The position of komatiites in general classification of igneous rocks is discussed. It is concluded that all previous classifications based on the single petrochemical parameter could not properly ...
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Geochemistry (Chapter 5)
Komatiites are extinct. The last eruption we know of took place on Gorgona Island some 90 Ma ago, and although sightings are regularly claimed in the literature and even more …
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Late-Paleoarchean Ultra-Depleted Commondale Komatiites: …
Komatiites are defined as high-Mg lavas (MgO >18%) and are associated with rocks that contain olivine spinifex (Arndt et al., 2008). ... The samples were cleaned in an …
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Review komatiites: from Earth's geological settings to
Abstract Komatiites are fascinating volcanic rocks. They are among the most ancient lavas of the Earth following the 3.8 Ga pillow basalts at Isua and they represent some of the oldest ultramafic magmatic rocks preserved in the Earth's crust at 3.5 Ga. This fact, linked to their particular features (high magnesium con-
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Komatiite
Komatiite ( ) is a type of ultramafic mantle-derived volcanic rock defined as having crystallised from a lava of at least 18 wt% MgO. Komatiites have low silicon, potassium and aluminium, and high to extremely high magnesium content. Komatiite was named for its …
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Highly siderophile element systematics of the early …
Ruth Well komatiites were derived from deep mantle melting in the majorite stability field, which resulted in depletions in Al and heavy REE. This source was also depleted in highly incompatible lithophile trace elements. 2.2. Hypothesis 2. The mantle source of the Ruth Well komatiites evolved with long-term chondritic Re/Os. 2.3. Hypothesis 3
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