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Geochemistry of komatiites and basalts in Archean
27 07 2019 Archean komatiites form an important host rock for Ni Cu sulfide deposits in the world In this study we examined Archean komatiites and komatiitic basalts from four areas in the Vedlozero Segozero greenstone belt and two areas in the Tikshozero greenstone belt Russian Karelia to constrain their Ni Cu sulfide mineralization potential using chalcophile element geochemistry The platinum
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Formation of Spinifex Texture in Komatiites an
Spinifex textured komatiite flows are generally subdivided into three major units as illustrated in Fig 1 A thin 1–10 cm olivine porphyritic upper chilled margin A 1 is underlain by a ∼5–50 cm thick A 2 layer that consists of fine skeletal and dendritic randomly oriented olivine crystals embedded in a glassy matrix Then follows a layer of coarse grained platy spinifex A 3 that
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Crushed Rock is an abandoned quarry in Mpape Abuja the capital of Nigeria The quarry was opened in 1977 just a year after the decision to relocate Nigeria s capital to Abuja from Lagos During the 1980s the quarry provided much of the stone for the construction of the new city
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Komatiites and Ni Cu PGE deposits
23 10 2019 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
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AP 42 Section 11 19 2 Crushed Stone Processing and
11 19 2 Crushed Stone Processing and Pulverized Mineral Processing 11 19 2 1 Process Description 24 25 Crushed Stone Processing Major rock types processed by the crushed stone industry include limestone granite dolomite traprock sandstone quartz and quartzite Minor types include calcareous marl marble shell and slate
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Origin of Paleoproterozoic Komatiites at Jeesiörova
Similarly the whole rock Re concentrations are high mostly above 0 5 ppb relative to komatiites from elsewhere e g Gangopadhyay Walker 2003 Gangopadhyay et al 2005 The whole rock samples mostly plot above a chondritic reference isochron and display a large variation in their respective calculated initial γ Os values
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jsjgeology
Komatiites are very rare igneous rocks They are one variety of extrusive ultramafic igneous rock although a komatiite in Canada has been interpreted to be an intrusive sill They are named after the Komati River in South Africa the type locality Komatiite is an exceedingly rare type of lava No volcano on Earth erupts this material today
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Textures in komatiites and variolitic basalts
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 restricted to the Archean varioles are cm scale leucocratic globular structures abundant in
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Re Os systematics of komatiites and komatiitic basalts at
01 11 2005 Whole rock samples were crushed into mm sized pieces using a ceramic jaw محطم Whole rock komatiites and komatiitic basalts with 187 Re 188 Os >1 generally plot below the 2 7 Ga chondritic reference isochron suggesting either post crystallization Re gain and/or Os loss
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Geology Word of the Week K is for Komatiite
15 01 2011 Komatiites are ultramafic volcanic rocks An ultramafic rock is a rock that has very low silicon SiO2 sodium NaO and potassium K2O and very high and iron FeO and magnesium MgO content generally greater than 18 weight percent MgO
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The origin of spinifex texture in komatiites
25 02 1999 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
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5 A common igneous rock in greenstones is komatiite a
5 A common igneous rock in greenstones is komatiite a Komatiites are rocks with greater than 18 weight percent magnesium oxide and a well developed spinifex texture of inter locking bladed or acicular pointed crystals of olivine or pyroxene 2
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Hydrogen rich hydrothermal environments in the Hadean
predominant ultramafic rock in the early Archean ocean floor Takai et al 2006 Regarding the genesis of komatiite there was a controversy as to whether koma tiites were derived from wet or dry mantle Arndt et al 1998 Grove and Parman 2004 since komatiites
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Komatiite
Komatiites are ultramafic mantle derived volcanic rocks They have low SiO 2 low K 2 O low Al 2 O 3 and high to extremely high MgO Komatiites were named for their type locality along the Komati River in South Africa True komatiites are very rare and essentially restricted to rocks of Archaean age and most are greater than two billion years old restricted in distribution to the Archaean
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mining gold quartz rock in komatiites محطم for sale
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Washington Rock s crushed rock is some of the best in the area as it is very hard which makes it durable It locks together to make a firm and unyielding driving surface The compaction efforts are less than similar gravel because it is 100 fractured It s superior to most other products in the area
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2020 Crushed Stone Calculator 3/4 inch rock
20 01 2021 Calculating Crushed Stone by Weight How to Calculate Crushed Stone To get to the total volume of crushed stone that you will need measure the width length and depth of your project A good rule of thumb for the depth of crushed stone projects is to calculate a minimum of 2 4 inches
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Hydrogen rich hydrothermal environments in the Hadean
21 12 2015 Serpentinization of Al depleted and Al undepleted komatiites and olivine for comparison was experimentally characterized under high temperature and high pressure conditions of 300 C and 500 bar to evaluate the H2 generation potential in komatiite hosted hydrothermal systems in the early Earth From the results the steady state H2 concentrations of fluids were estimated to be
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Komatiite
Komatiite k oʊ ˈ m ɑː t i ˌ aɪ t 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 type locality along the Komati River in South Africa and frequently displays spinifex texture composed
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ALEX STREKEISEN Komatiites
In the official IUGS recommendations a komatiite is defined as a high Mg volcanic rock with 52 > SiO 2 > 30 MgO > 18 NaO 2 K 2 O 2 and TiO 2 1 Le Bas 2000 Le Maitre et al 2002 Kerr and Arndt 2001 have also emphasized that komatiites should display characteristic textural features such as spinifex bladed and acicular olivine and/or pyroxene crystals in fine grained matrix
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Helium in the Archean komatiites revisited significantly
15 03 2002 Helium in the Archean komatiites revisited coarsely crushed whole rock samples were dried in an oven at 110 C for at least 1 h The samples were then loaded into the sample محطم or the furnace attached to the gas purification line and noble gas mass spectrometer VG5400
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Helium in the Archaean komatiites revisited significantly
Abstract In order to provide constraints on 3 He 4 He ratios in the Archaean mantle source we have analysed helium isotopic compositions in 2 7Ga old Archaean komatiites from the Abitibi green stone belt Ontario Canada Two spinifex textured komatiites yielded significantly high 3 He 4 He ratios of about 30Ra where Ra denotes the atmospheric 3 He 4 He ratio in fractions released by
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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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Helium in the Archean komatiites revisited significantly
15 03 2002 For helium isotope analyses coarsely crushed 1 17–1 70 mm bulk rock samples have been prepared Although it is desirable to separate the unaltered mafic minerals olivine or pyroxene it appears extremely difficult to separate a sufficient amount ∼1 g of fresh olivine with a grain size suitable for the vacuum crushing gas extraction ∼1 mm
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