[1]邱 潇,涂国祥*,李 明,等.汉源九襄砾石层沉积特征及演化[J].山地学报,2020,(5):647-657.[doi:10.16089/j.cnki.1008-2786.000542]
　QIU Xiao,TU Guoxiang*,LI Ming,et al.Sedimentary Characteristics and Evolution of the Stratified Gravel Deposits in the Jiuxiang Area of Hanyuan, China[J].Mountain Research,2020,(5):647-657.[doi:10.16089/j.cnki.1008-2786.000542]
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汉源九襄砾石层沉积特征及演化
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2020年第5期
页码:
647-657
栏目:
山地环境
出版日期:
2020-11-10

文章信息/Info

Title:
Sedimentary Characteristics and Evolution of the Stratified Gravel Deposits in the Jiuxiang Area of Hanyuan, China
文章编号:
1008-2786-(2020)5-647-11
作者:
邱 潇; 涂国祥*; 李 明; 王 清
成都理工大学 地质灾害防治与地质环境保护国家重点实验室,成都 610059
Author(s):
QIU Xiao;  TU Guoxiang*;  LI Ming;  WANG Qing
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China
关键词:
砾石层;  粒度;  沉积特征;  气候;  第四纪
Keywords:
gravel deposits;  particle size;  sedimentary characteristics;  climate;  quaternary period
分类号:
P531
DOI:
10.16089/j.cnki.1008-2786.000542
文献标志码:
A
摘要:
四川省汉源县九襄地区砾石层的沉积特征及演化与第四纪以来的气候变化有着密切联系。以四川汉源九襄三个地区堆积体为例,通过实地勘察和室内试验,对砾石层的颗粒组成、粒度特征、沉积特征及孢粉成分进行综合分析。得出以下结论:(1)堆积体中小于2 mm的颗粒粒径分布范围较广,其频率曲线多呈双峰型,主次峰粒径介于-1Φ～5Φ之间,大多具有细粒尾部。细颗粒大多以滚动、跃移及悬浮方式运移,其中滚动和跃移为主。(2)孢粉测试结果显示,第四纪更新世以来九襄砾石层的形成过程中至少经历两次明显的气候期,分别是温暖干旱期和温暖湿润期。该砾石层主要是后缘高山冰川消融过程中冰川融水搬运、堆积的产物。(3)九襄砾石层是多期冰川融水搬运、沉积的结果,使得其不同期次沉积物在粒径、磨圆度以及分选性上有较大差异。本研究为川西山区建设场地工程地质选址与稳定性评估提供科学数据。
Abstract:
The sedimentary characteristics and evolution of the stratified gravel deposits in Jiuxiang area of Hanyuan County, Sichuan Province,China are supposed to be in response to climate changes since the Quaternary period. In this study, the accumulation bodies in jiuxiang were carefully selected for detailed investigation on its formation and its association with paleoclimate. It analyzed the particle composition, particle size characteristics, sedimentary characteristics and palynological composition of the deposits comprehensively by field investigation and laboratory tests.The conclusions are as follows:(1)The size distributions of particles smaller than 2mm sampled at the three accumulation body were wide; Their frequency curves were mostly bimodal. The primary and secondary peak diameters ranged in size between -1Φ and 5Φ, and most of them had fine tails in graphs. Most of fine particles migrated in the modes of rolling, jumping and suspending, of which rolling and jumping were the majority.(2)Pollen analysis results suggested that since the Quaternary Pleistocene, the formation of the Jiuxiang gravel deposits had experienced probably at least two distinct climatic periods, namely a warm dry period and a warm humid period. The gravel deposits were mainly the product of transportation and accumulation of glacial melt water during the ablation of alpine glaciers at the rear of mountains.(3)The Jiuxiang gravel deposits were the joint results of multi-stage glacial melt water transportation and deposition, which made the sediments of different stages great differences to particle size, roundness and sortability. This research would provide scientific data for engineering ground selection and stability assessment of construction sites in the mountainous areas of western Sichuan, China.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-09-06; 改回日期(Accepted date):2020-08-29
基金项目(Foundation item):国家自然科学基金项目(41472274)。[National Natural Science Foundation of China(41472274)]
作者简介(Biography):邱潇(1994-),男,重庆市梁平人,硕士研究生,主要研究方向:岩土工程及地质灾害防治。[QIU Xiao(1994-),male, born in Liangping, Chongqing city, M.Sc. candidate, research on geotechnical engineering and geological disaster prevention] E-mail: 1297450134@qq.com
*通讯作者(Corresponding author):涂国祥(1978-),男,博士,教授,主要研究方向:堆积体工程地质特性及稳定性方面的研究。[TU Guoxiang(1978-),male, Ph.D., professor, specialized in hydrology, research on engineering geological characteristics and stability of accumulation body] E-mail: pyk@cdut.edu.cn
更新日期/Last Update: 2020-09-30