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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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The hydrated komatiites undergo metamorphic devolatilization through a series of dehydration reactions, some of which take place at temperatures beyond the greenschist- to amphibolite-facies transition (e.g., chlorite breakdown at ~800 °C; Hartnady et al., 2022).
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A broad range of primitive lavas. Mafic-ultramafic tholeiitic lavas such as basalts, picrites, and komatiites represent the deepest and hottest magmas that erupted on Earth.Three main families of komatiites are distinguished depending on their chemical composition; nicknames have been given to them according to locality of the main outcrops (): Al-depleted komatiites …
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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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Whole rock samples were crushed using a steel jaw crusher and small chips (3–15 mm) were then separated and washed in an ultrasonic cleaner for 10 min. Clean chips were then dried and milled using agate or mild steel mills. ... Komatiites appear further to the east, and these komatiites have been intruded by granitoids, which are in turn ...
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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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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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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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Komatiites and komatiitic basalts in the Abitibi greenstone belt exhibit pronounced spatial and temporal variations in major and trace element geochemistry that provide important constraints on their petrogenesis and tectonic setting. ... …
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Following the early description of komatiites from Barberton Mountainland, South Africa (Viljoen and Viljoen, 1969), these rocks were reported from different parts of the world including the greenstone belts of Canada, Africa, India and Australia.Komatiites are more common in the Archean greenstone belts and rapidly diminish in abundance by the late …
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sbm sbm mining gold quartz rock in komati... Find file Blame History Permalink sbm · 34e52685
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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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Komatiites are primarily extrusive volcanic rocks with high MgO contents (>18 %) that formed mainly during the Precambrian, especially during the Archean Era, and are …
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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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Textures of komatiites from the Alexo area. a A scanned thin section of a random olivine spinifex-textured lava (sample M662). Olivine crystals (in white) are randomly oriented and lie in a fine-grained matrix.b Polished slab of coarse platy olivine spinifex textured lava, sample Ax105. Large complex dendritic grains of olivine (black, serpentinized) enclose a cell within …
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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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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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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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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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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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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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Komatiites in the Luxi terrane have lower TiO 2 and HREE compared to others (Fig. 5, Fig. 11, Fig. 12), possibly due to higher degrees of partial melting or a more refractory mantle source, or possibly both (Polat et al., 2006). With the exception of the Barberton ADK, the depletion of komatiites' source can be seen in the steeper slopes of ...
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The komatiites that belong to the Gorgona Islands complex have been described as young komatiites (98.7 ± 7.7 to 64.4 ± 5 Ma) whose spinifex texture is composed of spicules made of olivine forsterite-type and pyroxene with high calcium content and low aluminum values.
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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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MORPHOLOGY AND COMPOSITION OF CHROMITE IN KOMATIITES FROM THE BELINGWE GREENSTONE BELT, ZIMBABWE MEI.FU ZHOU AND ROBERT KERRICH Department of Geological Sciences, IJniversity of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0 ABSTRACT Chromite grains in nearly fresh Archean komatiites from the late Archean …
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komatiites are stratigraphically equivalent to those exposed in the Alexo area and in Munro Township, and are part of the spatially extensive ( 180 km 12 km) Kidd-Munro volcanic ... ceramic jaw crusher. The freshest pieces were cleaned with Milli-Q water in an ultrasonic bath for ½ h and were subsequently dried in an
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Archaean komatiite flows have, most commonly, a basal olivine cumulate zone overlain by spinifex and containing a chill zone (commonly brecciated) both top and bottom. …
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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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shown, however, that these komatiites, like those in most other areas, erupted as lava flows. Further com-ments on the wet komatiite hypothesis have been given by Arndt et al. (1998) and Arndt (2003).
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