地质论评2011，Vol.57Issue(5)：675-686,12.
金沙江寨子村滑坡坝堰塞湖沉积及其对昔格达组地层成因的启示
Deposits of Zhaizicun Landslide-dammed Lake along Jinsha River and Its Implication for the Genesis of Xigeda Formation
摘要
Abstract
Height difference between the crown and the toe of rupture surface of Zhaizicun landslide along the right bank of Jinsha River is 638 m, with about 2.5×08 m3 total rock displaced. The giant rock landslide complex caused serious landslide-damming and the crest of the residual landslide dam with a volume of 180× 104 m on the left bank is 118 m above the river. Deposits of the landslide-dammed lake with a average width of 2. 6 km stretch 46 km along Jinsha Rive and the outcrop boundary takes on a branchy structure. The lacustrine deposits between 1180 ~ 1500 m above sea level consist of horizontally laminated clay and silt and sandwich fluvial sand-gravel layers. Fine-sandy, ripple cross-laminated and cross-stratified beds show the existence of bottom currents in the landslide-dammed lake. Deposits of Zhaizicun landslide-dammed lake is a representative case of the Xigeda Formation. Deposits of landslide-dammed lakes compose > 80% of the Xigeda Formation and landslide dammed lake genesis model for the Xigeda Formation may reasonably explain various its plane outcrop shapes, profile features, the genesis relationship between the Xigeda Formation and fluvial gravel beds, highly dependence on rivers, dimension difference and space discontinuity among different regions.关键词
滑坡/滑坡坝/堰塞湖/第四系/昔格达组Key words
landslide/landslide dam/landslide-dammed lake/Quaternary/ Xigeda Formation引用本文复制引用
徐则民..金沙江寨子村滑坡坝堰塞湖沉积及其对昔格达组地层成因的启示[J].地质论评,2011,57(5):675-686,12.基金项目
本文为国家自然科学基金-云南联合基金重点项目(编号U1033601),国家自然科学基金资助项目(编号40572159,40772189)的成果. （编号U1033601）
