IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
小江流域晚新生代地层的沉积相特征及其古环境意义
Alternative TitleSEDIMENTARY FACIES CHARACTER AND PALEOENVIRONMENT MEANING OF LATE CENOZOIC GROUP IN THE XIAOJIANG RIVER BASIN
Language中文
李吉均1; 况明生2; 杜榕桓3
Source Publication泥石流观测与研究
Editor杜榕桓 主编
Pages77-85
1996-06
Publisher科学出版社
Publication Place北京
Keyword云南小江流域 晚新生代地层 沉积相特征 古环境意义
AbstractProcesses of environment have been changed since quaternary in the Xiaojiang River Basin in the most southeast part of the Himalayan fault-blocks violently uplifting area, which is mainly meaning for us to bring to light the history of uplifting and environment changing of the Tibet plateau. This papter discusses the process of environment having been changed since the late Cenezoie era according to sedimentary facies character and comparative situationof time and space of late Cenozoie group. The Xiaojiang River Basin has been recognized that where fault lakes had been expanded , lacustrin secliments grew widespeadly and had entered the geological period of humid-hot climate and lake -swamps wideranging through the Yunnan Movement about 2.40 MaB. P.. After the Yuanmong Movement about 1. 60 MaB. P. the ground appeared intermissionally speedly having been uplift, lakes were pressed to contract, gullies grew and 6-7 steps of terraces had been formed. There took the Jinshajiang Movement about 1. 10MaB. P. to lead to gullies between lakes to link up gradually , and the Jinshajiang River system and its tributary , the Xiaojiang River, had been formed and the Xiaojiang River appeared speedly cutting down. Therefore, the Xiaojiang River Basin entered geological period of high mountain uplifting , valley culling down speedly and terraces being formed. The rhythm of the process of quaternary environment changing in the Xiaojiang River Basin was the same as that of environment of area above the Huanghe River in the northeast border district of Tibet Plateau , and the two acts of the Yunnan and the Yuanmong Movement about 2.40 and 1. 6MaB. P. were c1early B and C acts of Tibet epeirogenelic Movernent to exercise in the Xiaojiang River Basin.
Other Abstract位于喜马拉雅强烈断块隆起区南部是东边的云南小江流域内晚新生代地层的沉权相特征,对揭示青藏高原东南边缘地区自新构造运动以来的环境变迁具有重要的意义。本文根据沉积地层的岩相特征及其相对时空位置,着重讨论该地区晚新生代以来的环挠演变过程.揭示出该地区经过2. 4MaB. P. 前后的云南运动之后,各断陷湖泊明显扩张,湖相沉积广泛发育,从此进入一个气候温热湿润,湖沼广布的地质时期.至1. 6MaB. P. 元谋运动之后,各断陷湖泊表现出被挤压收缩的现象,地洒出现问歇性的大幅度快速抬升,沟谷发育, T6和T7两级阶地出现。1.lMaB.P. 前后时期发生金沙江运动导致各湖泊之间的沟谷相继串通,金沙江水系形成,小江出现并迅速地下切扩展,故白元谋运动之后,该地区为一高山深谷去展,河谷阶地形成的地质时代.这一过程同青藏高原东北缘黄河上游地区晚新生代以来环境演变的节奏相一致。2.4 和1.6MaB. P. 前后发生的云南运动和元谋运动显然是青藏运动B 幕和C幕在该地区新构造活动的表现。
ISBN7-03-005334-6
Document Type专著章节文集论文
Identifierhttp://ir.imde.ac.cn/handle/131551/27130
Collection成都山地所知识仓储(2009年以前)
Affiliation1.兰州大学地理科学系;
2.西南师范大学城镇与资源环境科学系;
3.中国科学院成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
李吉均,况明生,杜榕桓. 小江流域晚新生代地层的沉积相特征及其古环境意义. 泥石流观测与研究. 北京:科学出版社,1996:77-85.
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