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湖北秭归沙镇溪剖面的巫山黄土地层结构与特征
投稿时间:2019-07-17  修订日期:2019-11-05  点此下载全文
引用本文:李长安,张玉芬,李亚伟,苏建超,胡绪龙.2020.湖北秭归沙镇溪剖面的巫山黄土地层结构与特征[J].地质论评,(1):207-213,[DOI]:.
LI Chang’an,ZHANG Yufen,LI Yawei,SU Jianchao,HU Xulong.2020.Stratigraphic characteristics of the Wushan loess in Shazhenxi section, Zigui, Hubei[J].Geological Review,(1):207-213.
DOI:10.16509/j.georeview.2020.01.015
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作者单位E-mail
李长安 1)中国地质大学(武汉)地理与信息工程学院武汉430074
2)中国地质大学(武汉)关键带演化湖北省重点实验室武汉430074 
Email:1002858465@qq.com 
张玉芬 中国地质大学(武汉)地球物理与空间信息学院武汉430074  
李亚伟 中国地质大学(武汉)地理与信息工程学院武汉430074  
苏建超 中国地质大学(武汉)地理与信息工程学院武汉430074  
胡绪龙 中国地质大学(武汉)地球物理与空间信息学院武汉430074  
基金项目:注:本文为国家自然科学基金项目(编号:41877292, 41671011)和中国地质大学(武汉)“地学长江计划”项目(编号:CUGCJ1801)的成果
中文摘要:长江流域是中国粉尘堆积黄土的南界。分布于长江三峡河谷的巫山黄土是长江流域的代表性黄土,具有重要的科学意义。巫山黄土由于受峡谷地形影响及堆积之后边坡地质作用改造,在空间上零星分布于不同地貌位置,其厚度和完整程度常依其地形的不同而差异较大。已有研究也大多拘于对巫山县城一带的某一剖面的某一具体问题的讨论,尚缺乏对巫山黄土地层的总体认识。巫山黄土完整地层结构和黄土—古土壤序列特征,已成为制约其深入研究的基础地质问题。本文根据最近发现秭归沙镇溪黄土剖面,基于其代表性和完整性特点,首次对巫山黄土进行了地层划分,并与北方黄土进行了对比。研究认为,巫山黄土共有4层黄土、2层弱发育古土壤(钙质结核)和1层古土壤组成,大致相当于黄土高原的马兰黄土及离石黄土的顶部(L1—L2),4层黄土分别相对应于渭南黄土剖面的L1-1、L1-3、L1-5和L2,2层钙质结核分别相对于L1-2和L1-4,古土壤层即为S1。相比于北方黄土地层巫山黄土的黄土层颜色更加偏深、稍红,古土壤层S1裂隙面上见有明显的铁锰质薄膜,成壤作用较北方黄土更强。这可能是由于巫山黄土的地理分布更加靠近夏季风控制区,气候环境有所不同。
中文关键词:巫山黄土  黄土地层  古土壤  钙质结核  湖北秭归
 
Stratigraphic characteristics of the Wushan loess in Shazhenxi section, Zigui, Hubei
NameInstitution
LI Chang’an1) School of Geography and Information Engineering, China University of Geosciences, Wuhan, 430074; 2) Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences, Wuhan, 430074
ZHANG YufenInstitute of Geophysics and Geomatics, China University of Geosciences, Wuhan, 430074
LI YaweiSchool of Geography and Information Engineering, China University of Geosciences, Wuhan, 430074
SU JianchaoSchool of Geography and Information Engineering, China University of Geosciences, Wuhan, 430074
HU XulongInstitute of Geophysics and Geomatics, China University of Geosciences, Wuhan, 430074
Abstract:Objectives: Yangtze River basin is the southern boundary of dust and loess deposition in China. Wushan Loess distributed along the Three Gorges valley in Yangtze River is the representative loess profile in Yangtze River basin and has crucial scientific significance. It is significant not only to the supplement distribution region of loess, but also to the comparison with the north loess.Methods: Based on detailed field observation of Wushan loess profile in Shazhenxi section, Zigui, Hubei province, we have studied its features of petrology, stratigraphic structure. The division of the Wushan loess was initially proposed and comparison with the north loess was discussed. Results: Previous studies of the Wuhan Loess focus on the specific issue in a individual section in Wushan County, and the overall understanding of stratigraphic characteristics and Loess—paleosol sequence characteristics of Wushan Loess is still lacking, which has become a basic geological problem and seriously restrict its further development. In this paper, stratigraphic division of the Wushan Loess was carried out initially and comparison with the northern loess was performed according to the representative and integrated loess profile in Shazhenxi, Zigui County. The result showed that Wushan Loess has 4 layers of loess, 2 layers of caliche nodules and 1 paleosol layer, which were roughly equivalent to the top (L1—L2) of Malan loess and Lishi loess in the Loess Plateau. 4 layers of loess correspond to the L1-1、L1-3、L1-5 and L2 respectively in Weinan Loess Profile and 2 layers of caliche nodules correspond to the L1-2 and L1-4 respectively, and the paleosol correspond to S1. Conclusions: Comparation with the northern loess, the loess of Wushan Loess was darker and slightly red in color and the paleosol had more intense pedogenesis, which may be ascribed to different climate environment that Wushan Loess distributed in the south region of the Summer Monsoon control with stronger weathering.
keywords:Wushan loess  loess strata  paleosol  caliche nodule  Zigui County,Hubei Province
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