What is this layer?
Total MgO% content for ultramafic rocks, derived from the GSWA geochemistry database.
Legend
|
Legend |
Range (wt%) |
Classification |
Description |
Reference |
|---|---|---|---|---|
|
MgO wt% |
0–18% |
Manual |
Unlikely to be an ultramafic/komatiitic rock, unless these rocks have been altered and are depleted in MgO |
Arndt et al. (2008) Hill (2001) Huppert et al. (1984) |
|
18–32% |
Manual |
Komatiite; most typical chemistry of olivine spinifex-textured rocks |
Barnes (2006) |
|
|
>32% |
Manual |
Komatiite; more likely to be a cumulate-textured rock |
References
Arndt, NT, Lesher, CM and Barnes, SJ 2008, Komatiite: Cambridge University Press, Cambridge, UK, 467p.
Barnes, SJ (ed.) 2006, Nickel deposits of the Yilgarn Craton: Geology, geochemistry, and geophysics applied to exploration: Society of Economic Geologists, Special Publication 13, 210p.
Hill, RET 2001, Komatiite volcanology, volcanological setting and primary geochemical properties of komatiite-associated nickel deposits: Geochemistry: Exploration, Environment, Analysis, v. 1, p. 365–381.
Huppert, HE, Sparks, RSJ, Turner, JS and Arndt, NT 1984, Emplacement and cooling of komatiite lavas: Nature, v. 309, p. 19–22.