摘要
在加里东不整合面之上的华南纪盆系中，可识别出２０个正层序和相对应的海平面变化旋回，其中下泥盆统９个，中泥盆弦５．５个，上泥盆统５．５个。它们可归并为４个正层序组，最大海泛面分别位于ｓｕｌｃａｔｕｓ带，ｐｅｒｂｏｎｕｓ带（Ｄ＾３１），中、上ｖａｒｃｕｓ带（Ｄ＾２２）和ｇｉｇａｓ带。
Twenty orthosequences and their corresponding sea-level change (SLC) cycles have been recognized in the Devonian overlying the Caledonian unconformity, of which 9, 5. 5, and 5. 5 occur in the Lower, Middle and Upper Devonian respectively. They can be grouped into 4 orthose-quence sets, in which the maximum flooding surfaces lie in the sulcata Zone (D21), perbonus Zone (D31) , Middle and Upper varcus Zone (D22) and gigas Zone (D13) respectively. Four instant paleo-geographic reconstructions of South China have been made in the Emsian and Givetian. Devonian sea-level change rhythms of South China can be divided into 3 categories: autorhythmic, worldwide and regional allorhythmic, and coupling-rhythmic types. They developed respectively in the Famennian, Pragian, Eifelian, Lochkovian, Emsian, Givetian, Frasnian and F/F(between the Famennian and Frasnian) event. The cause of the worldwide allorhythmic SLC of the Praghian and Eifelian under comparatively dry, warm and tranquil conditions may be due to the pulsating expanding and contracting of the oceanic basin volume or the earth volume pulsation, rather than common glaciation and plate tectonism. The coupling-rhythmic SLC related to the F/F event is a sensitive indicator of the interaction between terrestrial and extraterrestrial factors, and coordinated action among the earth-spheres.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1997年第3期212-226,共15页
Acta Geologica Sinica
基金
高等学校博士学科点专项科研基金(编号9549111)
国家科委基础研究重大项目(SSLC)
国家自然科学基金(编号49472086)
关键词
泥盆纪
海平面变化
变化节律
圈层耦合
sequence stratigraphy, sea-level change rhythm, coupling among the earth- spheres , instant paleogeographic reconstruction, Devonian, South China
