Neoproterozoic high-K granites produced by melting of newly formed mafic crust in the Huangling region, South China

The Huangling igneous complex in the central Yangtze Block, South China, consists of the 850-Ma tonalite and trondhjemite which were intruded by the 826 ± 13 Ma high-K granite. The granites are composed of plagioclase (30–60%), alkali feldspar (10–30%), quartz (20–30%), biotite (<10%) and hornblende (<5%). Both hornblende and biotite have high Ti and low Al contents, indicating high liquidus temperature. The granites have high SiO2 (63.1–73.3...