Generation of late Mesozoic felsic volcanic rocks in the Hailar Basin, northeastern China in response to overprinting of multiple tectonic regimes.

ABSTRACT: We performed zircon U-Pb age dating and geochemical analyses of late Mesozoic felsic volcanic rocks in the Hailar Basin, NE China, with the aim of eclucidating their emplacement ages, origin and geodynamic significance. The volcanic rocks consist of dacites, rhyolites and rhyolitic tuffs. Laser ablation-inductively coupled plasma-mass spectrometry zircon U-Pb dating results suggest that the rocks were erupted during the Late Jurassic-Early Cretaceous (161-117 Ma). They belong to the high-K calc-alkaline series and can be divided into two groups. Group I rocks are metaluminous to weakly peraluminous, contain low concentrations of heavy rare earth elements (HREEs) and high field strength elements (HFSEs), and have low zircon saturation temperatures (average 786 °C), all of which indicate an

SUBMITTER: Ji Z 

PROVIDER: S-EPMC6825236 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature