柴达木盆地西部七个泉地区第四纪冰凌铸模  

Quaternary icicle cast structure in Qigequan area in western Qaidam Basin

作　　者：钟建华[1] 张云秋[2] 段宏亮[1] 马锋[1] 王冠民[1] 任拥军[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东东营257061 [2]中国科学院广州地球化学研究所,广东广州510640

出　　处：《古地理学报》2008年第4期419-424,共6页Journal of Palaeogeography：Chinese Edition

基　　金：教育部高校博士点基金项目(编号:20030425008;20060425509);CNPC创新基金项目(编号:2002F70108)联合资助

摘　　要：在柴达木盆地西部七个泉地区的一套第四纪碎屑岩中发育了一种圆柱状构造。根据圆柱状构造的形态结构及其与围岩的关系，以及与其他相似构造的研究成果进行对比，初步认为，该圆柱状构造的成因与冰川有关，可称为“冰凌铸模”。冰凌铸模呈圆柱状，直径10～14cm，高度多为5～30cm；具有圈层构造或无圈层构造，圈层厚约0～1．5cm，由中粗砂或细砾组成。冰凌铸模产于一套冰川和冰水沉积中，岩性主要为细砾岩、含砾中粗砂岩、砂岩、钙质泥岩。推测冰凌铸模是由冰川前端的冰凌因冰川垮塌扎入松软沉积物中，尔后融化被沉积物充填所形成的。A cylindrical structure, which is named as the icicle cast structure, was developed in the Quaternary elastic rocks in Qigequan area in western Qaidam Basin. According to the shape texture of the cylindrical structure and its relationship with other rocks, and by correlation with the studies of the similar structures, it is concluded that the origin of the cylindrical structure is related with the ice penitent. This kind of cylindrical structure can be named as the icicle cast structure. The icicle cast is cylindrical in shape and with diameter of 10 - 14 cm and a height of 5 - 30 cm. Some show internal lamination while others not. The lamination is 0 - 1.5 cm thick and is composed of medium-coarse grained sandstones or fine-grained conglomerate, gravelly medium-coarse grained sandstones, sandstones and calcareous mudstones. It is inferred that the icicle cast is formed due to the icicle in the front part of the glacier plunging into the soft sediments and then being filled by the sediments after melting.

关 键 词：柴达木盆地 七个泉 第四纪 冰凌铸模 

分 类 号：P512.42[天文地球—地质学]