Astrochronology of the Middle Jurassic Buqu Formation (Tibet, China) and its implications for the Bathonian time scale
作者： Leli Cheng , Jian Wang , Youli Wan , Xiugen Fu , Liangxuanzi Zhong
DOI: 10.1016/J.PALAEO.2017.08.018
关键词: Paleontology 、 Cyclostratigraphy 、 Structural basin 、 Stage (stratigraphy) 、 Astrochronology 、 Lower limit 、 Geology 、 Series (stratigraphy) 、 Scale (ratio)
摘要: Abstract The Buqu Formation in Qiangtang Basin China was formed during the Bathonian Stage of Middle Jurassic. subject this study is formation at Well QZ11 a depth from 34 to 591 m, located Southern Depression Basin. optimal accumulation rate result ASM analysis used as “target” tune GR (gamma ray) and DLR (double lateral resistivity) series QZ11. Power spectra tuned demonstrate existence prominent astronomical periods within Then ~ 100 kyr bandpass filtered curve establish floating time scale for Formation, maximum minimum sedimentation rates without considering factor compaction were 150 m/Myr 395 m/Myr, respectively. Using scale, lower limit duration estimated be approximately 2.09 Myr. This can serve reference temporal chronological calibrations Stage.
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