【摘要】 冰成沉积构造是在冰直接控制下而形成的沉积构造,冰融沉积构造是其中的一类。通过对黄河三角洲的野外地质考察,发现并描述了7种冰融沉积构造:冰融水流痕、冰成裂流痕、冰融丘(冰融痕)、冰成泥沙片、冰成泥沙笋、冰成豆粒和冰成根状构造。冰融沉积构造的形成受低温气候条件和沉积物的新鲜程度、疏松状况及饱含水等因素的控制。综合黄河三角洲现代冰融沉积构造的研究和胶莱盆地莱阳组马耳山段地层中冰融沉积构造的识别和环境解释,认为冰融沉积构造对河床、三角洲及潮坪等沉积环境和0℃左右的气候条件具有一定的指示意义。最后,系统总结了冰成沉积构造的分类。更多还原

【Abstract】 Ice-molten sedimentary structure is a kind of ice-induced sedimentary structure controlled mainly by ice. Ice-molten sedimentary structures produced in not only glacial zone and permafrost but also seasonal frozen zone. Through field observations, seven ice-molten sedimentary structures, i.e. ice-molten water flow mark, ice-induced rip current mark, ice-molten dome (mark), ice-induced silt or mud slices, ice-induced mud-sand stalagmite, ice-induced pisolite, ice-induced rhizome, are recognized in the Yellow River delta and described in this paper. Totally, ice-molten sedimentary structures formed under condition of low temperature, fresh sediments saturated with water. An analysis by synthesis about the characters of modern ice-molten sedimentary structures and ancient ice-molten sedimentary structures in Maershan Member, Laiyang Formation in the Jiaolai basin, east China, shows that ice-molten sedimentary structures are important for the identification of sedimentary environments such as river channel,delta and tidal flat, and low temperature climate. Additionally, systematical classification on ice-formed sedimentary structures is made, and the relationship on characters of ice-formed sedimentary structures between permafrost zone and seasonal frozen zone is discussed in this paper. Though scales and species of ice-formed sedimentary structures produced from permafrost zone and seasonal frozen zone are great different, their mechanisms of formation are basically similar.更多还原