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- W2374313108 abstract "Some Archean high-Mg diorites suite originally were recognized and termed sanukitoids by Shirey and Hanson (1984),which are similar to those of high-Mg andesites found in the Setonchi Miocene (11～15 Ma) volcanic belt in Japan. The sanukitoids are composed of diorite-monzodiorites-granodiorite and diffenrt from those of TTG suite (trondhjemite-tonalite-granodiorite). Sanukitoids have the following chemical characteristies: Mg numbers0.60, Ni and Cr are both100 ppm, Sr and Ba both typically 500 ppm, and light rare earth elements are strongly enriehed(100 chondritic values) with no Eu anomaly. High-Mg andesite is rare in the Archaean, but the intrusive equivalent, high-Mg diorite or sanukitoid, forms a minor but widespread component of most late Archaean terrains. The source region for sanukitoid parent magmas is thought to be the melting of the metasomatized mantle wedge, followed by extensive fractional crystallization in the crust. TTG and the sanukitoid suite may be continuous with each other, and both the products of slab melting, either directly (TTG) or indirectly (sanukitoid). Sannkitoids appear to concentrate in the Late Archaean, suggesting that subduction may have become an important process only after～3.0 Ga." @default.
- W2374313108 created "2016-06-24" @default.
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- W2374313108 date "2004-01-01" @default.
- W2374313108 modified "2023-09-25" @default.
- W2374313108 title "Sanukite of late Archaean and early Earth evolution." @default.
- W2374313108 hasPublicationYear "2004" @default.
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