摘要
通过对云南星云湖40多个现代沉积物样品的X射线照像研究,发现块状沉积物具有丰富的层理构造和生物构造,清晰地显示了主要沉积微环境的沉积构造特征,为盆地微相分析提供了充分的依据。
Sedimentary structure and lithology of modern and Quaternaty sediments from XingyunLake, Jiangchuan, Yunnan Province are studied on the basis of X-ray photos for 40 samples and obser-vation of the cores. The sediments mainly consist of noncalcareous fine detritial material (fine sand,siltsand), mud and coal. It's discovered that there are all kinds of physical structure (mega-ripple crossbeds, wave-ripple beds, small-ripple cross beds, homegenous beds) and organic structure (bioturbation,biota trace, plant roots) in massive sediments. The delta front, lake bay and shallow lake environment inthe lake have different sedimentary characteristics (sedimentary structure and sedimentationprocesses). The structure assemblage concerning massive beds in Quaternary sediments is discussed.Quaternary sedimentary environment is restored. Hence, sediments might be attributed to deposition ofdrift flow and turbidity.
关键词
湖泊
沉积物
沉积构造
X射线
照像
X-ray photograph
sedimentary micro-environment
sedimentary structure
environment analysis
