komatiite


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komatiite

[kō′mäd·ē‚īt]
(petrology)
A mantle-derived igneous rock with a high content of magnesium, particularly magnesium oxide.
References in periodicals archive ?
That produced a type of rock called komatiite, which are "basically superhot versions of Hawaiian-style lava flows," study leader and Virginia Tech professor Esteban Gazel said.
The Aztec Dome has a very similar regional magnetic signature to that seen at the Kambalda Dom where significant komatiite hosted nickel deposits have been discovered and mined over many years.
Komatute units can be tens or even hundreds of metres thick and can be traced continuously for up to 20 km, indicating that komatiite eruptions were major events during the Precambrian.
In much greater quantities, basaltic lava or komatiite could flow the required distances, but the volumes needed would completely overflow and bury the channels we observe.
The 132 North deposit is one of a number of small komatiite (ultramafic)-hosted nickel sulfide deposits in the Widgiemooltha district (McQueen.
And one of the first important fruits of their labors is a report in the June 13 NATURE on the melting of natural rocks to form komatiite, a very hot, magnesium-rich lava that erupted on the earth 2.
Pentlandite is the ore found at Redstone and Hart known to be associated with extrusive komatiite flows which form nickel bearing "pods" under certain physical and chemical conditions.
They are prospective for Archean komatiite related nickel sulphide deposits, Proterozoic circum-cratonic intrusive related nickel deposits, volcanogenic massive sulphide (VMS) copper-zinc deposits and lode gold-style deposits.
The project is also considered prospective for both intrusion-related (Ni-Cu-PGE) and komatiite flow-related Ni-sulphide mineralisation.
This tells us that the deep source where the komatiite came from, down near the boundary between the Earth's core and mantle, was gradually gaining platinum over time," he said.
1997, Komatiite flooding of a rifted Archean rhyolitic arc complex: Geochemical signature and tectonic significance of the Stoughton-Roquemaure Group, Abitibi greenstone belt, Canada: Journal of Geology, v.
Gold deposits documented within this segment of the Malartic mining camp are dominated by the association of porphyry-type gold mineralization hosted in either altered volcanic komatiite and basalt rocks of the Piche Group along the Cadillac-Larder Lake Fault Zone or altered sedimentary rocks of the Pontiac Group to the south.