西藏昂仁湖全新世湖相纹层介形类

Ostracoda from the Holocene Limnic Laminae in Angren Lake, Tibet

西藏昂仁全新世湖相沉积纹层发育,其中分析出介形类4属5种,即为 Leucocytherella trinoda、L.sinensis、Eucypris gyirongensis、Candona gyirongensis及Ilyocypris biplicata;介形类在纹层中呈现规律性变化,即深色层与浅色层介形类属种组成一致,定量数据揭示浅色层总丰度均大于深色层。根据介形类生态特征推测,浅色层代表盐度较高的年份沉积。

Five ostracod species belonging to four genera have been identified from well-developed Holocene limniclaminae in Angren Lake, Tibet, namely, Leucocytherella trinoda, L. sinensis, Eucypris gyirongensis, Candona gyiron-gensis and Ilyocypris biplicata. The same ostracod compositions are found from both the light color laminae and the darkcolor laminae, while the ostracod abundances in the light color laminae are higher than those in the dark laminae. Basedon the known ostracod ecological data, it is inferred that the light color laminae indicate higher salinity sediment.