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THE DISCOVERY AND CHARACTERISTICS OF THE GEGONGZHEN FORMATION OF VOLCANICS IN THE SOUTH ANHUI

WU Jia-fu;SUN Cheng-yun ;CHU Jin-hai;GENG Xiao-guang;XIE Jian-cheng (Academy of geological Survey of Anhui Province, Hefei 230001, China)  
After three sheets of 1: 50000 geological mapping in Guangang we found stratified and stratitoid meta - rhyolitic breccia lava in the Gegongzhen Formation, which are thought to be epimetamorphic intermediate - acid volcanics. The rhyolite - dominated vol- canics of this kind are resulted from the shallowly - sourced magma in the partially compressed uplifting continental crust thickening tectonic environment in the late Proterozoic.
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