沉积与特提斯地质2012，Vol.32Issue(1)：44-49,6.
藏北雁石坪夏里组高频岩相旋回的驱动机制研究
The driving mechanism of the high-frequency lithofacies cycles in the Middle Jurassic Xiali Formation in the Yanshiping area, northern Xizang
摘要
Abstract
The Walsh spectral analysis employs the discontinuous square waves or Walsh function instead of the continuous sine and cosine waves of the Fourier analysis. Because the Walsh function is discontinuous itself, the Walsh spectral analysis is widely used in detecting the periods in stratigraphic cycles. A succession of high-frequency lithofacies cycles composed of sandstone and mudstone occur in the Middle Jurassic Xiali Formation in the Yanshiping area, northern Xizang. According to the analysis of lithology and tinctures using the Walsh power spectra and filtering, the significant peak periods on both lithology and dinctorial spectra are in a very good correspondence with the Milankovtch cycles. The sea-level periodic changes are interpreted as the driving mechanism of the high-frequency lithofacies cycles in the Xiali Formation. The sedimentary duration of the whole Xiali Formation is about 3.689 Ma, with a sedimentary rate of about 0.111 m/ka.关键词
夏里组/Walsh频谱分析/米兰科维奇旋回/高频岩相旋回Key words
Xiali Formation/ Walsh spectral analysis/ Milankovitch cycles/ high-frequency lithofacies cycles分类
天文与地球科学引用本文复制引用
文军,伊海生,邱余波,吴池华,龚大兴..藏北雁石坪夏里组高频岩相旋回的驱动机制研究[J].沉积与特提斯地质,2012,32(1):44-49,6.基金项目
国家自然科学基金项目:青藏高原北部东昆仑山新生代构造隆升的沉积碎屑记录(40972084) （40972084）
