|Table of Contents|

The Sediments of Megafloods in the Daju Baisin of the Yangtze River(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2019年04期
Page:
118-123
Research Field:
·地理学·
Publishing date:

Info

Title:
The Sediments of Megafloods in the Daju Baisin of the Yangtze River
Author(s):
Wu Qinglong1; 2; 3
(1.School of Geography,Nanjing Normal University,Nanjing 210023,China)(2.Key Laboratory of Virtual Geographic Environment(Nanjing Normal University),Ministry of Education,Nanjing 210023,China)(3.Jiangsu Center for Collaborative Innovation in Geographica
Keywords:
the Yangtze River; the Daju Baisin; special clastic sediments; outburst flood; megaflood; Tiger-leaping Gorge
PACS:
P512.31
DOI:
10.3969/j.issn.1001-4616.2019.04.017
Abstract:
A suite of special sediments are distributed in the Daju Basin,just downstream the Tiger-leaping Gorge of the Yangtze River. They mainly consist of angular and subangular lime and marble clasts with thicknesses of up to more than 200 m and with heights of more than 250 m above river level. Some researches took them as moraine,aqueoglacial deposits,or lake sediments. However,the glaciers in glacial period could not have descended to the Daju Baisin,the flows melt from mountain glacials should have deposited rounded and subrounded gravels due to abrasion during transportation,and the lake environment should have formed typical lacustrine sediments consisting of silt and clay. The discovery of a massive outburst flood at～1920 BCE in the Yellow River valley provides a new enlightment to comprehend the origin of the special deposits in the Daju Baisin. Detailed observations show that the clastic deposits in the Daju Baisin share very similar characteristics with the identified sediments formed by a large outburst flood occurred at the dawn of Chinese civilization in the Yellow River valley. Thus,it could be concluded that the massive clastic sediments filled in the Daju Baisn should have been deposited by mega outburst floods from giant landslide dams in the Tiger-leaping Gorge that we never imagined.

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Last Update: 2019-12-31