Magnetopolarity Zone and Geological Age of the Nenjiang Formation at the CCSD-SK-1 Drill Core in the Songliao Basin
详细信息
- 责任者：Meng Qi’an (Exploration and Development Research Institute ; Daqing Oilfield Company ; Daqing 163712 ; China) ; Huang Qinghua
- 刊名：Journal of Stratigraphy
- 出版年：2013
- 卷期：37(2)
- 关键词：嫩江组 ; Nenjiang Formation ; 磁性地层学 ; magnetostratigraphy ; 松辽平原 ; Songliao Plain
- 页码：p.139-143
- 图表：illus., 2 tables, 16 refs.
- 分类号：1200
- issnNo：ISSN0253-4959
- isbnNo：CN32-1187/P
摘要
The Chinese Continental Scientific Drilling Project completed two drill cores (CCSD-SK-1-North and CCSD-SK-1-South) that penetrated the Cretaceous System of the Songliao Basin and recovered 888.18 m core material of the Nenjiang Formation. To establish the magnetostratigraphy of the Nenjiang Formation, 1 550 samples were collected and analyzed through stepwise thermal and/or alternating field demagnetization of the natural remanent magnetization (NRM). Based on a comprehensive analysis of the chronostratigraphic distribution of planktonic foraminifers, bentonite U-Pb zircon ages and the magnetostratigraphy, the normal magnetopolarity zone of the first member to the lower part of the second member of the Nenjiang Formation can be correlated with the upper of the Cretaceous Normal Superchron (CNS, C34n) in the geomagnetic polarity timescale. The reverse magnetopolarity zone, from the middle part of the second member to the fifth member of the Nenjiang Formation can be correlated with chron C33r. Thus, the Nenjiang Formation is of middle Santonian to early Campanian in age.