摘要
在前人大量地层、古生物、沉积相研究资料的基础上,开展了层序地层研究。层序地层研究的理论基础,以 Exxon 公司 P.R.Vail 教授等学者创建的理论为依据。对分布于广西及领省的泥盆系开展了广泛深入的调查研究,研究的对象以露头层序地层为目标。文章首先简要的介绍了地层系统及沉积相古地理概况。广西泥盆系的沉积类型多样。
Taking the Lujing section of Hengxian county for a representative example,this paper makes a research on distribution of sequence stratigraphy and their change regularity and on the sea-level change from all sides.The time bound is from Lower Devonian Lochkovian Stage to the top of Famennian Stage.As to Devonian System in Guangxi,Besides Qinzhou Trough,the widespread areas are located on the depositional environment of the shore intertidal zone and the subtidal zone from Lochkovian Stage to Eifelian Stage,to the south of Liuzhou the upper part of Lower Emsian Stage was evolved into the carbonate platform,whereas to the north of Liuzhou at the beginning of Givetian Stage,there existed the carbonate platform environmem.20 sequences were recognized in Guangxi,from which 1-3 Lochkovian Stage,1 Pragian Stage,1-5 Emsian Stage,2 Eifelian Stage,3 Givetian Stage,2.5 Frasnian Stage and 3.5 Famennian Stage.As a result of the gradually invasion of sea water from the south to the north and the west,the number of sequences of Lochkovian Stage and Emsian Stage is different and upward onlap of coasts many times took place.It is seen that sequences of the 1-type are Lochkovian SB(1),Emsian SB(7),SB(8)Eifelian SB(10),Givetian SB(12)and Famennian SB(16)and SB(17),whereas the others are of the Ⅱ-type.According to preliminary analysis of foreign and Chinese correlation of the sea-level change,it is considered that the sea-level change is not perfectly of global identical property,but it has specific character.It may be considered that the development and evolvement of sequences are controlled by binate factors of the sea-level change and tectonic movement.It is not only the major controlling factor of the sea-level change.
出处
《广西地质》
1996年第1期55-70,共16页
Guangxi Geology
关键词
广西
泥盆纪
层序地层
海平面变化
Devonian System
sequence stratigraphy
sea-levle change
