High Ba Sr Granite

They are shoshonitic with very high ba up to 9100 ppm and sr up to 3100 ppm concentrations.

High ba sr granite.

They were derived by partial melting of a slab melt hybridized lithospheric mantle. Implications for lamprophyre fractionation and high ba sr granite genesis fowler m. The continental slab break off was the mechanism associated with their origin. In this contribution.

View academics in high ba sr granite on academia edu. Quantitative major element trace element radiogenic and stable isotope modelling is consistent with early fractionation of clinopyroxene and biotite. The strong positive europium anomaly eu eu 2 22 underline the role of the plagioclase accumulation in the formation of the granitoids. The overall range of compositions is therefore extreme with mgo from 11 6 to 0 1 wt sio2 from 47.

The rogart pluton is a typical example of high ba sr granitic magmatism emplaced in northern scotland towards the end of the caledonian orogeny. Geochemistry of the serra das melancias pluton in the serra da aldeia suite. This is manifest in high ba sr and light ree abundances and incompatible element ratios in the derived magmas directly comparable with those of high ba sr granitoids and related rocks. Highlights we investigate two miocene plutons in western tibetan plateau.

These potassic high ba sr granites record important information on the growth and evolution of continental crust in the eastern block of the ncc particularly in the tsgt where typical greenstones crop out e g zhao et al 2001 polat et al 2006. Volumetrically rather small the plutons display a considerable range. A variety of high ba sr granites and syenites is intruded into the caledonian terrane of the northern highlands of scotland. It consists of three granitoid facies tonalite granodiorite granite that are locally associated with large enclaves of coeval mafic appinite.

In this case the orkney granite complex dates transcurrent faulting to 432 429 ma coeval with the 431 429 ma moine thrust. Several show an affinity to high ba sr granite yang et al 2008. Mixed caledonian appinite magmas. They show an association of granite and syenite.

The enrichment of ba 465 980ppm relative to sr 110 200ppm and the high k 2 o 1 85 6 33 suggest a pelitic parent.