摘要
陕西榆林侏罗系可划分4个层序。通过大断面写真、钻孔断面分析发现，层序－2（延安组）是3种类型小层序的重复叠覆，可归并为9个体系域，与海相地层有较大差异。系统分析其层序地层学特征，对于恢复古盆地水动力循环系统、沉积过程及矿产预测有重要意义。
The Jurassic system in Yulin, Shaanxi, is divided into four sequences in this paper. Profiles and boreholes indicate that the sequence 2 (Yanan Formation). displaved three types of small succession with recurrent oversteps, which may be ascribed to 9 system regimes. It is very different from marine facies. Systematic analysis of the stratigraphic succession features is significant for reconstruction of hydrodynamic circulation system, sedimentary process and prognostication of mineral resources in paleo-basin.
出处
《陕西地质》
1996年第A01期27-41,共15页
Geology of Shaanxi
关键词
陕西榆林
小层序
枯水体系域
湖泊扩张体系域
丰水体系域
湖泊萎缩体系域
Yuling in Shaanxi
Small-scale sequence
Low-water system
Lake and river expansion system
Water-rich system
Lacustrine depletion system
