The Rb/Sr characters of granitiods and orthogneisses at the Dabie Mountains
大别造山带花岗岩类和正片麻岩的Rb／Sr分区

Based on the ratios of Rb/Sr and other characters of geochemistry, the Dabie Mountains could be divided into four belt. They are, from north to south, Northern belt of North Dabie (NNDB), Southern belt of North Dabie belt (SNDB), Sourth Dabie belt (SDB) and Yangtze belt (YZB). NNDB is composed mainly of grey gneisses, that have Rb/Sr ratios of 0.01～0.09 and mafic-ultramafic rocks. SNDB has a lot of acid intrusion, Rb/Sr ratio of 0.3～0.9 and trondhjemiyic gneisses, having Rb/Sr ratios of 0.11～0.40. SDB is characterized by the occurrence of UHP rock. Studies on the ratios of Rb/Sr indicated a value of 0.05～0.07. YZB is mainly composed of grey gneisses and gneissic granites, that have Rb/Sr ratios of 0.04～0.27.