摘要
柴达木盆地西部的茫崖坳陷发育了第四纪湖泊冰水沉积,其特征是灰绿、黄褐色页岩和泥岩中含大量的冰水滴石。滴石最大粒径可达4cm×12cm,成分复杂,有火山岩、变质岩及沉积岩。孢粉分析表明,其形成时代为第四纪,极有可能为更新世,与我国西部的第四纪冰期形成时代相同,但具体期次尚不能确定。柴西茫崖坳陷第四纪冰水沉积证据充分,对于研究我国第四纪冰期及青藏高原的形成演化、古气候、古地理具有重要意义。另外,第四纪冰水沉积充分说明在第四纪冰期青藏高原没有被整个大冰盖所覆盖。
The Quaternary outwash, characterized by the dripstone bounded by the gray and yellow shale and mudstone, is discovered in the Mangai depression of Qaidam basin. The dripstone is up to 4 cm × 12 cm with complicated compositions owing to the volcanic, metamorphic and sedimentary origin. The sporo-pollen analysis revealed that it is formed in Quaternary period, most probably Pleistocene epoch, coinciding with the Quaternary glacial epoch of West China although the detailed age is, as yet, uncertain. The strong evidence of outwash existed in the Manghi depression is of great importance to the research on the evolution and paleoclimate, paleogeography of Qingzang plateau of Quaternary glacial epoch of China. Moreover, it reveals that a whole ice cover in the Quaternary does not cover the Qingzang plateau.
出处
《沉积学报》
CAS
CSCD
北大核心
2005年第2期284-290,共7页
Acta Sedimentologica Sinica
基金
教育部博士点基金资助项目部分成果(项目编号:20030425008)
CNPC创新基金资助项目部分成果(项目编:2002F70108)
