沉积与特提斯地质2025，Vol.45Issue(1)：112-119,8.DOI:10.19826/j.cnki.1009-3850.2023.08010
松科3井下白垩统登娄库组米兰科维奇旋回识别及其古气候意义
Milankovitch cycle identification of Denglouku Formation in Songliao Basin and its paleoclimate significance
摘要
Abstract
Under the promotion of the Cretaceous continental scientific drilling project,the Songliao Basin has become one of the hotspots for the Cretaceous terrestrial paleoclimate research.Among these studies,the consistency and differences between the paleoclimate change of the Songliao Basin and coeval global climate change are currently the focus of attention.In this paper,the cores of the Denglouku Formation obtained from the continental scientific drilling of Well Songke-3 in the Songliao Basin were selected.The chemical weathering index Rb/Sr ratio was obtained through XRF scanning,and the time series analysis method was applied to study the cyclostratigraphy.The analysis results show that:(1)The variation in the chemical weathering index Rb/Sr ratio,as shown in the XRF scanning curve,indicates the process of the climate from humid to arid during the deposition of the Denglouku Formation.(2)The optimal deposition rate of the Denglouku Formation is about 14.43 cm/ka,which can be combined with the wavelength of the depth domain to identify the Milankovitch cycles preserved in the Denglouku Formation,including precession(20-19 ka),obliquity(45-39 ka),short eccentricity(130-100 ka),and long eccentricity(450-390 ka)signals of the climate cycle.(3)With the application of power decomposition analysis(PDA),it is shown that eccentricity and precession signals are dominant,while the obliquity signal is very weak in the Early Cretaceous Denglouku Formation.This is consistent with the global climate change record.关键词
松辽盆地/登娄库组/米兰科维奇旋回/古气候Key words
Songliao Basin/Denglouku Formation/Milankovitch cycle/paleoclimate分类
天文与地球科学引用本文复制引用
罗力铭,余蔓琳,李琦,吴舟凡,黄永建..松科3井下白垩统登娄库组米兰科维奇旋回识别及其古气候意义[J].沉积与特提斯地质,2025,45(1):112-119,8.基金项目
国家自然科学基金(42272134,41972112) （42272134,41972112）
