The Shimian ophiolite in the western Yangtze Block, SW China: Zircon SHRIMP U-Pb ages, geochemical and Hf-O isotopic characteristics, and tectonic implications

The Shimian mafic-ultramafic rocks in the western Yangtze Block is a structurally dismembered complex which is intruded by the Neoproterozoic granite and faulted against the Neoproterozoic Suxiong Group. In this study, we divide the Shimian mafic-ultramafic rocks into two suites including the Late Mesoproterozoic Shimian ophiolite and Early Neoproterozoic gabbros, based on differences in the field occurrence, age, and geochemical...