Comment on 'Origin of TTG-like rocks from anatexis of ancient thickened crust: Geochemical evidence from Neoproterozoic granitoids in South China' [Lithos 113 (2009) 347-368]

摘要

Petrogenesis and tectonic regime of the widespread Neoproterozoic igneous suites in South China has been hotly debated for years. As a unique granitoid batholith emplaced into the Archean nucleus (the Kongling terrain) of the Yangtze craton, the Huangling intrusive complex (H1C) also has been engaged in a hot debate (Gao and Zhang, 1990; Ma et al., 2002; Li et al., 2003; Zhang et al., 2009). Two contrasting models for the HIC petrogenesis have been proposed. The first one is an arc-related model which inferred that the batholith was formed by ancient oceanic plate subduction beneath the Yangtze craton (Gao and Zhang, 1990; Ma et al., 2002), while the alternative model is an anatexis origin of the Precambrian high-grade basement through a mantle plume under-plating, which induced the breakup of the Rodinia supercontinent (Li et al., 2003). However, due to a tectonic setting distant from the contemporary continental margins during the period of Neoproterozoic, the slab subduction-related model for this intrusive complex, emplaced into the Archean nucleus of the Yangtze craton, seems apparently implausible (e.g. Li et al., 2003; Zhang et al., 2009).