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·Rare examples of Phanerozoic komatiites are found in the Song Da zone NW Vietnam These komatiites were erupted through continental crust and may belong to the SE extension of the Permo Triassic Emeishan volcanic province located in SW China They provide a good opportunity to study the source characteristics of starting plume magmas in a continental
·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
·The freshest Archean komatiites those from the Zvishavane area in Zimbabwe are only slightly more altered than the Gorgona rocks but most other known examples of Precambrian komatiites are less well preserved It must be accepted that all komatiites are altered to a greater or lesser extent and any investigation of their geochemistry has to
·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 Hypothesis 2 The mantle source of the Ruth Well komatiites evolved with long term chondritic Re/Os Hypothesis 3
·142 Komatiito Komatiíto uma rocha ígnea vulcânica ou extrusiva composta principalmente por olivina e piroxênio por isso ultramá maioria dos komatiitos observados hoje datam do arqueano ou seja foram formados há 2 5 3 8 bilhões de anos
·We report the discovery of upper Paleozoic komatiites from a location near Mashhad in NE Iran Like Archean komatiites they erupted as differentiated lava flows with olivine spinifex−textured upper portions and olivine cumulate lower portions They are associated with komatiitic basalts and undifferentiated ultramafic units and are intercalated with clastic and
·In order to provide constraints on 3 He/ 4 He ratios in the Archean mantle source we have analyzed helium isotopic compositions in 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
Komatiitic rocks from Gorgona Island Colombia in contrast to their Archaean counterparts occur as rather structureless flows In addition textural and mineralogical features indicate that the Gorgona komatiites may have crystallized from superheated liquids Komatiitic rocks have MgO contents which range from 24 to 11 wt % and plot on well defined olivine Fo90 control lines
Timing and MgO content of komatiites through Earth history a Frequency of komatiites in greenstone belts as a function of age Komatiites are thought to track the temperature of the mantle and more specifically that part of the mantle from which mantle plumes rise Arndt et al 2008 An important feature of the graph is that it shows an abrupt rather than a gradual
·Komatiites are particularly useful for determining absolute and relative abundances of the highly siderophile elements HSE including Os Ir Ru Pt Pd and Re in their mantle sources and crushed in an alumina faced jaw crusher A 100 g aliquot of crushed sample was ground in an alumina shatter box and re ground in an alumina faced disk
L enfoncement de komatiites par sagduction dans la croute peut conduire à sa fusion et sa contamination par un magma de TTG Tonalite Trondhjmite Granodiorite Ce magmatisme très spcifique produit des granitoïdes calco alcalins très riche en magnsium prsentant souvent des phnocristaux de feldspath potassique appel
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
·Komatiites are ultramafic volcanic rocks containing more than 18 per cent MgO ref 1 that erupted mainly in the Archaean era more than gigayears ago Although such compositions occur in
·Barberton type komatiites are moderately high degree melts from a particularly hot and deep source; Munro type komatiites are very high degree melts of a slightly cooler source Kimberlites result from low degree melting also at great depth of sources rich in incompatible elements and CO 2 H 2 O They become further enriched through
·The 2·7 Ga komatiites from the Alexo locality in the Abitibi greenstone belt are located close to those from Pyke Hill; they are aluminum undepleted type komatiites in that they have Gd/Yb and Al 2 O 3 /TiO 2 indicative of derivation from high degree melts of a primitive mantle source Arndt et al 2008; Puchtel et al 2009 A database has been compiled
·Komatiites are highly magnesian lavas which contain evidence of extensive serpentinization and magnetite Fe2 Fe3 2O4 production close to the Archaean seafloor H2 production in komatiitic
·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
·is the single biggest factor in controlling mineralisation styles in komatiites On the other hand evidence of crustal contamination does not necessarily provide information of the prospectivity of komatiites to host Ni Cu PGE mineralisation despite being a good proxy for the style of komatiite emplacement and the nature of country rocks
·komatiites and high Archaean mantle temperatures and evoke a hydrous reservoir in the deep mantle early in Earth s history We investigated samples of billion year old komatiites from two
Komatiites Komatiites are fascinating volcanic rocks They are among the most ancient lavas of the Earth following the Ga pillow basalts at Isua and they represent some of the oldest ultramafic magmatic rocks preserved in the Earth s crust at Ga This fact linked to their particular features high magnesium content high melting
·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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·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
