地质学报（英文版）2007，Vol.81Issue(6)：996-1001,6.
Recognition of Milankovitch Cycles in the Natural Gamma-Ray Logging of Upper Cretaceous Terrestrial Strata in the Songliao Basin
Recognition of Milankovitch Cycles in the Natural Gamma-Ray Logging of Upper Cretaceous Terrestrial Strata in the Songliao Basin
摘要
Abstract
Spectrogram analysis of seven natural gamma-ray logging of Member 1 of the Qingshankou Formation (K2qn1) and Member 1 and 2 of the Nenjiang Formation (K2n1-2) of Late Cretaceous age in the Songliao Basin reveals sedimentary cyclicities controlled by Milankovitch climate periodicities.The recognition of Milankovitch cycles allows estimation of an average accumulation rate of ～7.55-8.62 cm/ka for the K2qn1 sections, and ～6.69-10.16 cm/ka for the K2n1-2 sections. Two marine transgression events occurred during the deposition of K2qn1 and K2n1-2 and their ages are at ～0.74-1.10 Ma and ～2.38-4.84 Ma, respectively. Identification of Milankovitch cycles from fine-grained deep lake sedimentary rocks in the Songliao Basin may provide great potential for high-resolution stratigraphic subdivisions and correlations.关键词
Songliao Basin, gamma-ray logging, Milankovitch cycles, marine transgression eventsKey words
Songliao Basin, gamma-ray logging, Milankovitch cycles, marine transgression events分类
天文与地球科学引用本文复制引用
..Recognition of Milankovitch Cycles in the Natural Gamma-Ray Logging of Upper Cretaceous Terrestrial Strata in the Songliao Basin[J].地质学报（英文版）,2007,81(6):996-1001,6.基金项目
This study was jointly supported by the National Key Basic Research Development Program of China (Grant 2006CB701406), Program for New Century Excellent Talents University (Grant NCET-04-0727), and Research Found of State Key Laboratory of Geological Processes and Mineral Resources (Grant GPMR200651). （Grant 2006CB701406）
