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 as a 'picritic rock'.
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 magmatic rocks preserved in the Earth’s crust at 3.5 Ga.
Komatiites reveal a hydrous Archaean deep-mantle reservoir
2016年3月30日 · Archaean komatiites are shown to originate in hot mantle plumes that entrained hydrous material from deep in the mantle. Komatiites are a rare type of volcanic rock, formed uniquely during the...
(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 of how mantle melting...
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 oldest ultramafic magmatic rocks preserved in the Earth’s crust at 3.5 Ga.
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 >18 wt% MgO. Komatiites are in places associated with spinifex textures (elongated bladed and plumose olivine crystals).
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 contents of most other elements.
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).
KomatiitesPetrology, Volcanology, Metamorphism, and …
2006年1月1日 · 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 extreme eruption temperatures.
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 crystals of olivine ...