Late Oligocene Sedimentary Hiatus in Deep Sea Area of South China Sea, Result of Calcareous Nannofossils from ODP Site 1148

作     者：Su Xin Key Laboratory of Lithospheric and Lithoprobing Technology, China University of Geosciences, Ministry of Education, Beijing 100083, China State Pilot Laboratory of Coast & Island Development, Nanjing University, Nanjing 210093, China 

作者机构：Key Laboratory of Lithospheric and Lithoprobing TechnologyChina University of Geosciences Ministry of Education Beijing 100083 China State Pilot Laboratory of Coast & Island Development Nanjing University Nanjing 210093 China 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2004年第15卷第1期

页      面：69-74页

核心收录：

学科分类：070704[理学-海洋地质] 0709[理学-地质学] 07[理学] 0707[理学-海洋科学] 

基　　金：ThispaperissupportedbytheNationalNaturalScienceFoundationofChina(No .49732 0 60 ) 

主　　题：sedimentary hiatus calcareous nannofossils Late Oligocene ODP Site 1148 South China Sea. 

摘      要：In order to determine the age of the sedimentary hiatus and its geological significance, a study of the calcareous nannofossil biostratigraphy was carried out. Detailed stratigraphical data of the Late Oligocene-Early Miocene diagnostic species thus obtained. The nannofossil zonation of this interval was subdivided and the Oligocene-Miocene boundary was further determined. Several last Late Oligocene events were recognized, indicating a long-term sedimentary hiatus in the uppermost Upper Oligocene. The time span of the hiatus was estimated for about 2.2 Ma, at least from 23.9 to 26.1 Ma. The lithological and geophysical data from Site 1148 indicate some abrupt sedimentary changes that occurred below and above the hiatus. This hiatus at Site 1148 was probably related to the tectonic change, a major ridge jump during the seafloor spreading in the Late Oligocene South China Sea.