Surface Textural Analysis of Quartz Grains from Modern Point Bar Deposits in Lower Reaches of the Yellow River

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Cheng, Yong^1 ; Liu, Cong^1 ; Lu, Ping^1 ; Zhang, Yu^2 ; Nie, Qi^1 ; Wen, Yiming^1

Mining Engineering Faculty, Kunming Metallurgy College, Kunming

650033, China^1

Foreign Languages Faculty, Kunming Metallurgy College, Kunming

650033, China^2

关键词: Environmental significance;    Hydrodynamic conditions;    Lower reaches of the yellow rivers;    Physical and chemical properties;    Sedimentary environment;    Sedimentary process;    Surface fluctuations;    Surface textural analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/3/032023/pdf
DOI  :  10.1088/1755-1315/108/3/032023

来源: IOP

【 摘 要 】

The surfaces of quartz grains contain characteristic textures formed during the process of transport, due to their stable physical and chemical properties. The surface textures include the information about source area, transporting force, sedimentary environment and evolution history of sediment. Surface textures of quartz grains from modern point bar deposits in the lower reaches of the Yellow River are observed and studied by scanning electron microscopy (SEM). Results indicate that there are 22 kinds of surface textures. The overall surface morphology of quartz grains shows short transporting time and distance and weak abrasive action of the river water. The combined surface textures caused by mechanical action indicate that quartz grains are transporting in a high-energy hydrodynamic condition and suffer a strong mechanical impact and abrasion. The common solution pits prove that the chemical property of transportation medium is very active and quartz grains receive an obvious chemical action. The combination of these surface textures can be an identification mark of fluvial environment, and that is: quartz grains are main subangular outline, whose roundness is higher with the farther motion distance; Surface fluctuation degree of quartz grains is relatively high, and gives priority to high and medium relief; V-shaped percussion marks are very abundant caused by mechanical action; The conchoidal of different sizes and steps are common-developed with paragenesis relationship; Solution pits are common-developed as well. The study makes up for the blank of surface textures analysis of quartz grains from modern fluvial deposits in China. It provides new ideas and evidence for studies of the sedimentary process and environmental significance, although the deep meanings of these micro textures remain to be further researched.