DISINTEGRATION OF THE HUASHAN GROUP IN THE DAHONG MOUNTAIN AREA, NORTHERN HUBEI

Lithologic tectonic mapping indicates that the original "Huashan Group" should be disintegrated into three parts which are of different ages and were formed in different tectonic settings. The first one is the Huashan ophiolitic mélange composed mainly of basic volcanic rocks and emplaced tectonically into the Xiangguang fault northeast of Dahong Mountain. The second is the volcanic sedimentary series in the Gengji Banqiao area west of Dahong Mountain, which is a tectonic block of the Suixian Group in the South Qinling belt. The third is the newly defined Huashan Group, which consists mainly of conglomerates, sandstones, mudstones and slates deposited in the Late Proterozoic.