华南晚古生代硅质岩时空分布及再扩张残留海槽演化

根据硅质岩系的岩石组合和放射虫化石群的垂向变化，将华南泥盆系至中二叠统划分为５个构造层序，除早泥盆地的第１构造层序和晚石炭世的第４构造层序之外，其余每个构造层序对应出现一个放射虫生物群演替旋回，底部从无放射虫硅质泥岩带开始，向上变化为种属单调的中深海放射虫化石带，然后出现深海放射虫化石组合带，上部又出现了中深海放射虫化石组合带，这种演替旋回常常与海底火山喷发过程同步，代表残留海槽的一次再伸展扩张过

TIME_SPACE DISTRIBUTION OF LATE PALEOZOIC CHERTS AND EVOLUTION OF RESPREADING TRENCH IN SOUTH CHINA

The sedimentary successions from Devonian to Middle Permian can be dividied into 5 tectono_sequences according to the vertical association of chert and muddy chert and the radiolarian fauna succession cycle. Except that no radiolarian fossil is discovered in the first and fourth tectono_sequences, the radiolarian fauna succession cycle can be recognized in other tectono_sequences. The absent radiolarian muddy cherts occur at the lower part of tectono_sequences. Upward the bathyal and eupelagic types of radiolarian assemblage are found in turn while the bathyal type of radiolarian assemblage appears again at the top part. This radiolarian fauna succession cycle is usually coupled with the submarine basalt eruption, which may be the response to the respreading proccess of the relict trench. The southeastern relict trench developed from Devonian to Middle Permian underwent 3 respreading processes after the early filling stage of Early Devonian. The Dongwu tectonic event resulted in the close of the respreading relict trench and formation of the Hercynian orogen along southeastern Guangxi, southeastern Hunan, western Jiangxi, southeastern Anhui and western Zhejiang.