黄河源区日玛曲流域古堰塞湖的沉积特征及环境意义  

SEDIMENTARY CHARACTERISTICS AND ENVIRONMENT OF THE ANCIENT DAMMED LAKE IN RIMAQU BASIN IN THE YELLOW RIVER SOURCE AREA

作　　者：陈有顺[1] 魏海成[2] 李善平[2,3] 李伍福[3] 

机构地区：[1]青海省地震局,青海西宁810001 [2]中国科学院青海盐湖研究所,青海西宁810001 [3]青海省地质调查院,青海西宁810001

出　　处：《高原地震》2009年第1期32-35,共4页Plateau Earthquake Research

摘　　要：在黄河源区支流日玛曲河谷发现第四纪湖相沉积,以含砾粉砂、粉砂、粘土互层组合为特征,形成河流的第一阶地基座。通过对该剖面野外岩性观测1、4C测年分析,探讨了古湖形成时代及成因,以及古湖发育时期周围的植被与环境。研究结果发现,古湖形成于3 120aBP前后,可能属于地震堰塞湖,于640aBP以后出现决堤事件。A group of Quaternary gyttjor are discovered in Rimaqu basin in the Yellow River source area which formed the first terrace foundation, included gravel aleurite, aleurite and clay layer. The framing age, cause, vegetation and environment of the ancient dammed lake are discussed by lithologieal profile testing and 14C age determination. The results show that the ancient dammed lake formed about 3 200aBP, might be earthquake dammed lake, and it might burst its bank about 640aBP later.

关 键 词：堰塞湖 日玛曲 黄河源区 

分 类 号：P534.63[天文地球—第四纪地质学]