Splet11. nov. 2024 · They belong to the high-K calc-alkaline to shoshonitic S-type series on the base of geochemical data. Zircon Hf isotopic compositions of the Grobgneis metagranites show εHf(t) values of − 4.37 to − 0.6, with TDM2 model ages of 1.31–1.55 Ga, indicating that their protoliths were derived by the recycling of older continental crust. ... SpletShoshonites and latites contain clinopyroxene, plagioclase, rare olivine, and biotite phenocrysts, set in a groundmass made of abundant sanidine, Fe–Ti oxides, and glass. …

Recycling of sediment into the mantle source of K-rich mafic

SpletShoshonia is an extinct genus of prehistoric sarcopterygians, or lobe-finned fish.. See also. Paleontology portal; Fish portal; Sarcopterygii; List of sarcopterygians; List of prehistoric … Splet01. jan. 2014 · The shoshonitic series consists of pyroxene monzodiorite, monzonite, and quartz monzonite, which are commonly associated with skarn-type gold deposits. … siwash camp

Primitive shoshonites from Fiji: Geochemistry and source …

Spletshoshonitic has further expanded to include other K-rich rocks not obviously linked to a subduction environment, such as the plutonic appinite and vaugnerite (biotite-, hornblende-, plagiocase-bearing rocks, Le Maitre et al. 2002) series, and the minette, vogesite, kersantite and spessartite ‘calc-alkaline’ lam-prophyres (Rock 1987). SpletThe northern Mariana Arc and southern Volcano Arc, from 23°N to Iwo Jima, are erupting rocks of a shoshonitic series with phenocrysts of plagioclase, clinopyroxene, olivine, and biotite. These rocks are less saturated than those of the subalkaline provinces and are substantially enriched in Ba (400–900 ppm), Sr (600–1000 ppm), K 2 O (1–4 ... Spletcalc-alkaline series and of the shoshonitic series4 '18• The series defined above are based on the hypothesis of evolution in a chemically closed system of a deep magma … siwase coal