扬子西缘龙门山区泥盆纪沉积旋回与相序样式  

HIERACHIES AND PATTERNS OF DEPOSITIONAL CYCLES AND LITHOFACIES SEQUENCE IN DEVONIAN IN LONGMENSHAN AREA, WESTERN YANGTZE PLATFORM

作　　者：李祥辉[1] 刘文均[1] 郑荣才[1] 

机构地区：[1]成都理工学院沉积地质研究所

出　　处：《矿物岩石》1998年第2期115-120,共6页Mineralogy and Petrology

摘　　要：扬子西缘龙门山地区泥盆系可识别出一个二级、三个准二级、十八个三级沉积旋回和三十余种高频旋回，低级（高频）旋回往往以不同形式叠加构成高一级沉积旋回。高频旋回具有复杂的相序结构样式，大致可概括为非对称向上变浅、加深和对称型三种。整个泥盆纪沉积旋回的旋回演化作用早期为异旋回作用，中期为自旋回与异旋回作用交替，晚期则转变成自旋回作用为主。There are eighteen 3rd order depositional cycles recognized in the Devonian of Longmenshan aera which are stacked to three para 2nd order cycles and one 2nd order cycle, and a lot of high frequence cycles with complicated lithofacies sequences are distinguished too. The patterns of lithofacies sequence for the high frequence cycles can be divided into three ways as the asymmetric upward shallowing, the asymmetric upward deepening, and symmetric fluctuation. The high frequency cycles in the transgression of the 2nd order cycle are changed from dominant allocycles to autocycles, and those in the regression are predominative of autocycles.

关 键 词：沉积旋回 泥盆纪 龙门山区 相序样式 

分 类 号：P534.44[天文地球—古生物学与地层学]