摘要
民和盆地在晚侏罗世时期为冲积相河流沉积。本文在对上侏罗统沉积相研究的基础上 ,采用Miall提出的“结构单元”分析法对河流类型做了一定的研究 ,并进一步利用Ethrich、Schumm等人的系列方程式计算得出了反映古河道几何形态和水动力状态的所有定量参数 ,从而在定量的角度确定了古河流环境演化特征。研究结果表明 :晚侏罗世时期从早到晚 ,古河流演变规律是
The Minhe Basin is one of the typical land basins containing coal, oil and gas. The study area—the Yaojie area sank at Jurassic, where sediments are fluvial sediments of Late Jurassic. On the analytical basis of sedimentary facies, this paper quantitatively deals with the characteristics of the channel geometry and hydrology of ancient rivers, and the evolution types of the rivers by using the analysis method of architecture elements.\; The results have indicated these quantitative parameters reflecting the characteristics of ancient rivers, including width/depth ratio (F), sinuosity index (P), bed load percent content (B\-p), annual flow discharge (Q\-\{ma\}), annual load discharge (Q\-m), velocity of flow (V), sedimentary load parameter (M) and so on, reveal a general law, i.e., fluvial river→braid river of low sinuosity→middle sinuosity river→high sinuosity river.
出处
《矿物学报》
CAS
CSCD
北大核心
2000年第2期102-107,共6页
Acta Mineralogica Sinica
关键词
民和盆地
古河流
结构单元
晚侏罗世
定量研究
Minhe Basin
ancient river
architecture elements
ancient river parameter
