(PDF) Application of lithogeochemistry in the assessment of nickel

Geochemical data from this study indicate that Paleoproterozoic komatiites in the Pulju Greenstone Belts and Archean komatiites in the Enontekiö area are prospective for nickel-sulphide ...

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Formation of Spinifex Texture in Komatiites: an Experimental Study

The formation of platy olivine spinifex, the texture that characterizes komatiite lavas, has long been enigmatic. A major problem is that the dendritic morphology of the olivine resembles that of crystals grown in laboratory experiments at high cooling rates (>50 C/h), but at the position where these textures form, up to several meters below the komatiite flow top, the …

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Ni-Cu-PGE Metallogenesis of Komatiitic Rocks in the Abitibi …

Komatiites in the Pacaud assemblage are Ti-depleted komatiites (TDK) with high AbO31TiOz (25-35) and low [Gd/Yb]c~ (-0.6) (CN: chondrite normalized using values from McDonough and Sun, 1995), suggesting a garnet-rich source or formation via dynamic melting similar to Gorgona komatiites (Arndt et al., 1997).

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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.

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Re-Os systematics of komatiites and komatiitic basalts at …

In this paper, we report Re-Os concentrations and isotopic compositions of whole rocks and chromite separates from a suite of ca. 2.7-Ga komatiites and komatiitic basalts in the …

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Platinum group element geochemistry of komatiites from the …

Platinum group element geochemistry of komatiites from the Alexo and Pyke Hill areas, Ontario, Canada 1. ... and crushed in an alumina-faced jaw crusher. A 100- to 150-g aliquot of crushed sample was ground in an alumina shatter box and finely reground in an alumina-faced disk mill, and was used for the geochemical studies. The rest of the ...

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Re Os ISOTOPIC STUDY OF KOMATIITIC VOLCANISM AND …

477 All whole-rock powders were prepared using a ceramic jaw crusher and an agate mill. Rhenium and Os concentrations and Os isotopic compositions were obtained on 0.1–0.5 g of rock powder using a low-blank Carius tube acid-digestion method, modified from that described in Shirey & Walker (1995), the details of which are described in Lambert ...

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Contrasting komatiite belts, associated Ni–Cu–(PGE) deposit …

komatiites and hence promoting ore genesis (Lesher et al. 2001). However, this study questions the role of crustal ... a ceramic-faced jaw crusher. A 100–150 g aliquot of crushed sample was ground in an agate mill and was used for geochemical studies. Figure 2 (a) Simplified geological map of the Mt Keith domain, showing the location of the ...

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The origin of spinifex texture in komatiites | Nature

Many komatiites, including the exceptionally fresh and well exposed flows at Pyke hill in Munro township, northeastern Ontario, erupted as subaqueous lava flows 1,4.The thermal effect of seawater ...

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Petrogenesis of the > 2.90 Ga komatiite in the Sujiagou region of …

Komatiites are known but knowledge about these rocks in the NCC is limited (Cheng et al., 1982). Komatiites in the eastern NCC were first reported from the Neoarchean Taishan Group in the Luxi terrane (Cheng et al., 1982). Although spinifex texture was not initially reported, subsequent studies have confirmed that komatiites in the Sujiagou ...

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Highly siderophile element systematics of the early Archean …

komatiites. In the Ruth Well komatiites, Os abundances are controlled solely by olivine fractionation. This is typical of early Archean komatiites due to higher temperatures of the mantle. The Os abundances are higher than the Schapenburg and are more similar to late Archean komatiites. II. Background The drill core samples were collected by Prof.

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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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The discovery and petrogenetic significance of komatiites

Komatiites were first discovered by Richard and Morris Viljoen in the Barberton greenstone belt of South Africa and proposed as a new class of ultramafic volcanic rock with …

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A new class of silica enriched, highly depleted komatiites in the

The precise tectonic setting of komatiites in the Archaean is a contentious subject. The prevalent model is that all komatiites were the result of varying, but usually high degrees of mantle partial melting under conditions of high temperature (Arndt and Nisbet, 1982) and most likely to have originated as plumes generated close to the core mantle boundary (Boehler et …

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Platinum group element geochemistry of komatiites from the …

Many komatiites are interpreted to have ascended through continental crust and to have flowed tens of km from their eruptive sites (Lesher et al., 1984; Arndt, 1986b; Hill et al., 1995; Lesher …

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Komatiite

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 …

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Textures in komatiites and variolitic basalts | Request PDF

Komatiites and variolitic basalts are widespread in Archean volcanic sequences. Spinifex is a spectacular bladed olivine or pyroxene texture that characterizes komatiite, a rock almost exclusively ...

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(PDF) Komatiites: their geochemistry and origins

Komatiites are ultra-hot ultramafic lavas, largely restricted to the Archaean. They represent an extreme endmember of terrestrial magmatism and challenge our understanding …

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Nickel isotope fractionation in komatiites and associated sulfides …

The case for Ni isotopes is more complex, and fractionations have been previously thought to be small and restricted to continental weathering (Cameron and Vance, 2014; Ratié et al., 2015) or biological processes such as methanogenesis (Cameron et al., 2009).While no significant Ni isotope fractionation has been reported due to fractional crystallization or partial …

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Komatiites and Ni-Cu-PGE deposits | Geology for Investors

Komatiites are exclusive ancient rock types which exhibit a unique spinifex texture. The Ni-Cu-PGE mineralisation generally occurs as massive sulfide ore at the floor of the komatiitic flow or as disseminated sulfides through olivine-rich layers. It is worth noting that the critical features whether the mineralisation will occur are the flow ...

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Chromite in Komatiites, II. Modification during Greenschist …

JOURNAL OF PETROLOGY VOLUME 41 NUMBER 3 PAGES 387–409 2000 Chromite in Komatiites, II. Modification during Greenschist to Mid-Amphibolite Facies Metamorphism STEPHEN J. BARNES CSIRO EXPLORATION ...

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(PDF) Komatiites

Komatiites are ultramafic volcanic rocks that occur mainly in Archean and Paleoproterozoic greenstone belts. These olivine-rich rocks are assumed to have crystallized from magmas that have about ...

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Contrasting komatiite belts, associated Ni–Cu–(PGE) deposit …

komatiites is metasomatic introduction or depletion of elements during metamorphic and/or hydrothermal fluid–rock interaction. In the Agnew–Wiluna greenstone belt, some portions of …

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Geochemistry of a komatiitic, boninitic, and tholeiitic basalt

Samples were crushed with a steel jaw crusher at the University of Western Australia to a size of 0.2–2 ... komatiites, tholeiitic basalts, and boninites. Komatiites have been subdivided into Al-undepleted (AUK, or Munro-type) and Al-depleted (ADK, or Barberton-type) varieties, and ADK into Al-depleted and Al-depleted–Ti-enriched subtypes ...

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Highly siderophile element systematics of the early Archean …

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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Review komatiites: from Earth's geological settings to

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 content, high melting temperatures, low dynamic …

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Petrogenesis and Geochemistry of Archean Komatiites

Abstract. Komatiites are products of decompression melting of mantle so hot that they are almost exclusively restricted to the Archean. The high degree of partial melting ( F) and pressure ( P) required for their generation facilitates comparison between the magma composition and its mantle source.To investigate compositional variations in Archean komatiites, a global …

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