Sanukitoids are intermediate to felsic igneous rocks which possess both modern crust characteristics (i.e., richness in K) and Archean TTG features (i.e., fractionated rare-earth element patterns). Most of them were emplaced between 2.7 and 2.3 Ga on Earth.
Sanukitoids, also called high-magnesium granodiorites, were first described by Shirey and Hanson (1984). They consist in a complete magmatic series, from diorite to granite, the most common facies consisting in monzodiorites and monzogranites. Typically they are rich in both K-feldspar phenocrysts and mafic minerals such as biotite and hornblende with sometimes subordinate amounts of clinopyroxene.
Sanukitoid can occur as plutons of all sizes, with a broad range of crustal emplacement levels and degrees of heterogeneity: sanukitoids in the Central Pilbara Craton, Western Australia (Smithies and Champion 1999), form small (<1 km), homogeneous stocks of shallow-emplaced...
KeywordsArchean-Proterozoic transition Continental crust Mantle metasomatism
References and Further Reading
- Martin H, Moyen J-F, Rapp R (2009) The sanukitoid series: magmatism at the Archaean-Proterozoic transition. Earth Environ Sci Trans R Soc Edinb 100:15–33Google Scholar
- Smithies RH, Champion DC (1999) High-Mg diorite from the Archaean Pilbara Craton; anorogenic magmas derived from a subduction-modified mantle. Geol Surv West Austr Annu Rev 1998–1999:45–59Google Scholar