Komatiite - Wikipedia
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% magnesium oxide (MgO). [1] It is classified …
Komatiites reveal a hydrous Archaean deep-mantle reservoir
2016年3月30日 · Archaean komatiites (ultramafic lavas) result from melting under extreme conditions of the Earth’s mantle. Their chemical compositions evoke very high eruption …
Komatiites - ALEX STREKEISEN
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 …
Komatiite - an overview | ScienceDirect Topics
Komatiite is the signature rock type of Archean greenstone belts and is found across almost the entire age span of Archean crust. The different varieties of komatiite—Al-depleted, Al …
The discovery and petrogenetic significance of komatiites
2023年9月1日 · 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 …
Review komatiites: from Earth’s geological settings to planetary …
2007年2月15日 · 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 …
Komatiite | rock | Britannica
Komatiite, a magnesium-rich, high-temperature volcanic rock derived from very hot mantle (part of the Earth between the crust and the core), was extruded in abundance during the early …
(PDF) Komatiites: their geochemistry and origins - ResearchGate
2023年7月27日 · Komatiites are ultra-hot ultramafic lavas, largely restricted to the Archaean. They represent an extreme endmember of terrestrial magmatism and challenge our understanding …
Komatiite - SpringerLink
2021年3月11日 · Komatiite is a volcanic rock of ultramafic composition. It is distinguished from the more common basaltic magma by a higher content of MgO (>18%) and correlated low …
Archaean ultra-depleted komatiites formed by hydrous melting …
2003年6月19日 · Komatiites are ultramafic volcanic rocks containing more than 18 per cent MgO (ref. 1) that erupted mainly in the Archaean era (more than 2.5 gigayears ago).
Geological evidence for high H2 production from komatiites in the ...
2023年11月6日 · From the petrological investigation of 38 samples of komatiitic basalt to komatiite, we identify the unique serpentinization reaction responsible for H2 production from …
KomatiitesPetrology, Volcanology, Metamorphism, and …
Nickel sulfide deposits of the Yilgarn craton are almost exclusively associated with komatiites, a distinctive suite of ultramafic volcanic rocks characterized by very high MgO contents implying …
(PDF) Komatiites - ResearchGate
2008年3月1日 · Komatiites are ultramafic volcanic rocks that occur mainly in Archean and Paleoproterozoic greenstone belts. These olivine-rich rocks are assumed to have crystallized …
Komatiite - SpringerLink
Komatiite is a volcanic rock of ultramafic composition. It is distinguished from the more common basaltic magma by a higher content of MgO (>18%) and low contents of most other elements. …
Komatiite - Natural Atlas
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, …
The komatiite testimony to ancient mantle heterogeneity
2022年4月5日 · Komatiites are crystallized samples of high-temperature, high-MgO lavas that were common during the Archean, but became increasingly rarer in the Proterozoic and …
Komatiite - Encyclopedia.com
2018年5月8日 · komatiite An extrusive igneous rock of peridotite composition, dominated by essential magnesium olivine accompanied by lesser amounts of aluminous clinopyroxene and …
Komatiite: Mineral information, data and localities. - mindat.org
About Komatiite Hide. Name: Named for the locality: Komati River, Barberton, Transvaal, South Africa. A variety of ultramafic lavas that crystallize from high temperature magmas with 18% to …
Komatiite - SpringerLink
2020年12月13日 · Komatiite is a volcanic rock of ultramafic composition. It is distinguished from the more common basaltic magma by a higher content of MgO (>18 %) and low contents of …
The origin of spinifex texture in komatiites | Nature
1999年2月25日 · Komatiites are high-temperature, fluid, magnesium-rich lavas typically of Archaean age. A striking characteristic feature of such lavas is ‘spinifex’ texture—plate-like …