Lithofacies Paleogeography Characteristics of Early Ordovician in the Eastern Part of North China Platform(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2015年第06期
- Page:
- 1-9
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Lithofacies Paleogeography Characteristics of Early Ordovician in the Eastern Part of North China Platform
- Author(s):
- LIN Yu-xiang; ZHAO Cheng-jin; ZHU Chuan-zhen; LUAN Wei-na; WU Yu-chen; LI Jia; LI Xiu-qin
- School of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
- Keywords:
- lithofacies paleogeography; sequence stratigraphy; Early Ordovician; North China Platform; petroleum prospecting; favorable area
- PACS:
- P531
- DOI:
- -
- Abstract:
- Based on sequence stratigraphy, the Lower Ordovician in the eastern part of North China Platform can be divided into two Ⅲ-type sequences, which belong to Xinchangian stage and Daobaowanian stage, respectively. During Early Ordovician, there are two types of sedimentary environments including shallow sea and coastal deposit environments with shallow sea water. The archicontinent marginal sedimentary transits to carbonate platform sedimentary from south to north, and the restricted platform and supratidal dolomitic flat develop. Due to the tectogenetic inconsistency of platform, the differential uplift and depression are magnified between the south and the north as well as a continuous regression, moreover, the subsidence-sedimentary center extends from the latitudinal direction to the longitudinal direction. There is comprehensive action of various tectonic stresses and predominant direction. Relative sea level inherits the decrease in the end of Cambrian, and the regression happens from NW to SE. Dolomitic flat and restricted platform expand eastward, thus open platform retreats northward and eastward. The sedimentary facies is divided into south part and north part, so that the partition of lithology is significant, and the limestone transits to dolomite from platform to tidal flat. Specially, the penecontemporaneous dolomite of dolomitic flat subfacies develops, and the dolomite from Liangjiashan Formation of Lower Ordovician can act as high-quality reservoir in Meso-Cenozoic basin.
Last Update: 2015-11-27