Wrekin terrane

[1][2][4] On the other side of the terrane the Malvern complex is composed of diorite and tonalite plutons that have been altered by Proterozoic metamorphism (modifying the original igneous textures) by still exhibit calc-alkaline, magmatic arc geochemical signatures.

[1][4] The later phases of intrusion are noted within the Wrekin Range where the Uriconian rhyolite is cross cut with the Neoproterozoic Ercall Granophyre.

[1][5] The Uriconian sedimentary geology is mainly composed of bimodal (acidic, intermediate and basic) intra-plate volcanics with only minimal influence from subduction.

[6] The geochemistry notes that fractional crystallisation process within the magma chamber links the lavas with the tuffs and gives intra-plate as well as subduction geochemical signatures.

The Warren House Formation is composed of pillow basalts, intermediate lavas, altered rhyolites and welded and non-welded acid tuffs with evidence to suggest that they are linked via fractional crystallisation.

The geochemical signature from this sequence is contrasting to that of the rest of the Wrekin Terrane being of a volcanic arc formed on oceanic or on thin, immature continental crust.

[1][3] The supergroup consists of c.6000 m of sedimentary rocks with varying facies from basinal and distal turbidite to deltaic and fluviatile successions which exhibits a generally regressive sequence.

[7] The Wrekin terrane contains abundant evidence of Ediacara fauna which include the body fossil taxa Beltanelliformis brunsae and B. minutae.