High Ba Sr Granite

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.

High ba sr granite.

Highlights we investigate two miocene plutons in western tibetan plateau. It consists of three granitoid facies tonalite granodiorite granite that are locally associated with large enclaves of coeval mafic appinite. Volumetrically rather small the plutons display a considerable range. A classic post collisional high ba sr granite in the riacho do pontal fold belt ne brazil june 2016 brazilian journal.

The strong positive europium anomaly eu eu 2 22 underline the role of the plagioclase accumulation in the formation of the granitoids. 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. In this case the orkney granite complex dates transcurrent faulting to 432 429 ma coeval with the 431 429 ma moine thrust.

Mixed caledonian appinite magmas. View academics in high ba sr granite on academia edu. The continental slab break off was the mechanism associated with their origin. They show an association of granite and syenite.

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. They were derived by partial melting of a slab melt hybridized lithospheric mantle. 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 overall range of compositions is therefore extreme with mgo from 11 6 to 0 1 wt sio2 from 47.

In this contribution. 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. 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. Implications for lamprophyre fractionation and high ba sr granite genesis fowler m.

The rogart pluton is a typical example of high ba sr granitic magmatism emplaced in northern scotland towards the end of the caledonian orogeny.