West Kennet Granodiorites

"Seventy-seven pieces of very weathered pyroxene-bearing granodiorite corestone excavated from trenches 2, 3 and 9 within Structure 5 of West Kennet in 2019 and 2021 and varying from small pebbles to >500grms cobbles, have a total weight of 22kg. Detailed petrographical and geochemical analyses of typical samples show them to share an unusual (for Britain) and distinctive mineralogy and petrography and also suggest they are all from a single outcrop/subcrop. The essentially unaltered pyroxene-bearing granodiorite carries 'large' skeletal zircon crystals, which are a determinative characteristic. Petrological comparisons with similar British granodiorites show that its origin is to be found within the large, 60km 2 and lithologically highly diverse Cheviot Igneous Complex of Northumberland, more than 450km from West Kennet."

Exotic granodiorite lithics from Structure 5 at West Kennet, Avebury World Heritage Site, Wiltshire, UK. / Ixer, Rob; Bevins, Richard; Pearce, Nick et al. In: Wiltshire Archaeological and Natural History Magazine, 2025

 https://www.academia.edu/125773662/West_Kennet_Granodiorites