High Ba Sr Granite

Highlights we investigate two miocene plutons in western tibetan plateau.

High ba sr granite.

View academics in high ba sr granite on academia edu. The overall range of compositions is therefore extreme with mgo from 11 6 to 0 1 wt sio2 from 47. Ach uaine hybrid appinites represent a rare example of lamprophyric magmas that were demonstrably exactly contemporaneous with felsic differentiates preserved within a suite of minor hypabyssal. This indicates that strain partitioning and high ba sr magmatism across the scottish highlands was an immediate response to attempted subduction of avalonia beneath laurentia during the scandian collision.

Mixed caledonian appinite magmas. 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. Geochemistry of the serra das melancias pluton in the serra da aldeia suite. They are shoshonitic with very high ba up to 9100 ppm and sr up to 3100 ppm concentrations.

A variety of high ba sr granites and syenites is intruded into the caledonian terrane of the northern highlands of scotland. The continental slab break off was the mechanism associated with their origin. In this contribution. It consists of three granitoid facies tonalite granodiorite granite that are locally associated with large enclaves of coeval mafic appinite.

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. 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. The rogart pluton is a typical example of high ba sr granitic magmatism emplaced in northern scotland towards the end of the caledonian orogeny. Implications for lamprophyre fractionation and high ba sr granite genesis fowler m.

They were derived by partial melting of a slab melt hybridized lithospheric mantle. A classic post collisional high ba sr granite in the riacho do pontal fold belt ne brazil june 2016 brazilian journal. Volumetrically rather small the plutons display a considerable range. The strong positive europium anomaly eu eu 2 22 underline the role of the plagioclase accumulation in the formation of the granitoids.

In this case the orkney granite complex dates transcurrent faulting to 432 429 ma coeval with the 431 429 ma moine thrust.