Discovery and Its Tectonic Significance of the Proterozoic Miaowan Ophiolites in the Southern Huangling Anticline,
Studies of strongly deformed and metamorphosed mafic-ultramafic rocks from the Proterozoic Miaowan Formation in the high-grade metamorphic Kongling Group in the southern Huangling anticline show that the mafic rocks are composed of layered fine-grained amphibolites, metagabbro rockbodies and dykes and diabase dykes, while the ultramafic rocks are mainly composed of serpentinized dunite and harzburgite, cropping out as tectonite slices and blocks within amphibolites. All these features indicate that the mafic-ultramafic rocks from the Proterozoic Miaowan Formation within Kongling Group in the southern part of Huangling anticline, are a structurally dismembered ophiolite resting above an ophiolitic mélange, sitting on top of the Proterozoic shelf sequence on the Yangtze Craton.