Sandstones of the Itmurundy accretionary complex, central Kazakhstan, as archives of arc magmatism and subduction erosion: Evidence from U-Pb zircon ages, geochemistry and Hf-Nd isotopes

•The Itmurundy accretionary complex hosts two groups of immature greywacke sandstones.•Group 1 sandstones were derived from juvenile arc igneous rocks and deposited in fore-arc basin/trench.•Group 2 sandstones were derived from mixed arc igneous rocks and deposited in back-arc basin.•Sandstones of both groups formed by erosion of an Ordovician intra-oceanic arc.