摘要
以沉积相为基础，通过对汝阳群的层序地层研究，初步建立了该区中元古代地层格架，共划分了６个层序，并讨论了层序形成的主要控制因素。
ruyang Group was the clastic carbonate sediments deposited in a basin of the thermal contraction after the volcanic eruption(Xionger Group)in Late Mesoproterozoic. The group can be divided into 6 third-order sequences,which can be correlated with the sections of Xiatang,Changcun and Ruyang. But the Ⅱ Ⅴ sequences are absent in the Fuguang region due to the tectonic rising. The studies of the inner composition and the relevant sedimentary facies indicate that the group was formed in the continental marginal basin with ramp. The recognition of lowstand system tract characterized with incised valley fillings and condensed section could not be extensively applied to the study of sequence stratigraphy of this type of basins. While the recognition of paleo-weathering crust,rarinement surface and sedimentary facies hiatal surface,and the analysis of accumulation type and the determination of the sediments deposited in relatively starved trage are important ways to study the sequence stratigraphy of Ruyang Group. Based on the division of the depositional system tracts in the sequences,the Ruyang Group can be further divided into 12 units,which can be isochronously correlated with different sections through the detail determination of stacking types of parasequences,so as to improve the correlation of Ruyang Group.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1996年第3期272-276,共5页
Earth Science-Journal of China University of Geosciences
基金
国家科委及地矿部共同资助国家重大基础研究攀登项目
关键词
中元古代
汝阳群
层序地层
豫西地区
Ruyang Group,stratigraphic accumulation type,sequence boundary,relatively starved sediment,stratigraphic correlation,western Henan Province.
