SUBDIVISION AND CORRELATION OF THE DEVONIAN CLASTIC STRATA AFTER THE KWANGSIAN OROGENY IN SOUTH CHINA
The first sediments received in the Devonian in South China were clastic rocks after the Kwangsian Orogeny(Caledonian).The clastic rocks are very thick and contain few fossils,which caused difficulties in stratigraphic division and correlation.Based on the biostratigraphic and lithostratigraphic data from 117 sections in South China,the subdivision and correlation of these Devonian clastic strata were performed.Three types of the Devonian clastic strata were recognized in the contact type with the underlying strata,namely,angular unconformity,parallel unconformity,and the mixed type(or Longmenshan type seen in the Early Devonian only).The revision of the subdivision and correlation of the Devonian clastic strata after Kwangsian Orogeny were summarized based on the biostratigraphic data of the fossil plant flora,spore and fish assemblages,in consideration of marine animal fossils from the overlying strata.The comprehensive analysis in geochronology,paleontology,lithology,and palaeogeography of the Devonian strata after the Kwangsian Orogeny in South China,reflected a trend of sedimentary process from southwest to northeast,indicating a transitional process from land to shallow sea.During the Devonian,changes in sedimentary environment are consistent in general,but the initiation of deposition and subsequent sedimentary processes in various regions are different and distinctive.
South ChinaKwangsian OrogenyDevonianclastic stratasubdivision and correlationgeneral sedimentary process
万方数据
维普
