中国石油大学学报（自然科学版）2012，Vol.36Issue(1)：27-32,6.DOI:10.3969/j.issn.1673-5005.2012.01.005
珠江口盆地中中新世韩江组天文调谐地质年代表
Astronomical time scale of middle Miocene Hanjiang formation in Pearl River Mouth Basin, South China Sea
摘要
Abstract
Cyclostratigraphic analysis was undertaken with several different spectral analysis methods on the Hanjiang formation of Langhian age (middle Miocene) in the Pearl River Mouth Basin of South China Sea, which consists of deltaic silici-clastic and neritic shelf carbonate rhythmic alternations. Within biochronological constraint, a high-resolution astronomical time scale was constructed through astronomical tuning of the natural gamma-ray well-logging record to the 65 °N insolation curve and obliquity curve, which are from the most recent astronomically calculated variation of the earth's orbit. The results show that the Hanjiang formation cycles are controlled by variation of the earth's orbital period. The astronomically tuned time scale can be used to calculate astronomical ages for geological events and bioevents recognized throughout the period, and the results are only slightly different from earlier estimates in South China Sea. The astronomical time scale resolves the sedimentation history for the Langhian stage (middle Miocene) with a variation that strongly resembles that of the earth's orbital eccentricity. The main factor controlling the variability of the sedimentation rate in the Hanjiang formation may be related to the 405 ka long period eccentricity.关键词
旋回地层学/珠江口盆地/中中新世/Langhian阶/韩江组/米兰科维奇旋回/沉积速率Key words
cyclostratigraphy/ Pearl River Mouth Basin/ middle Miocene/ Langhian stage/ Hanjiang formation/ Milanko-vitch cycles/ sedimentation rate分类
天文与地球科学引用本文复制引用
田世峰,陈中强,查明..珠江口盆地中中新世韩江组天文调谐地质年代表[J].中国石油大学学报（自然科学版）,2012,36(1):27-32,6.基金项目
Australian Research Council discovery grant(DP0770938 to ZQC) （DP0770938 to ZQC）
