摘要
为探究粗粒组分对加积型红土物源的影响及其环境意义,选取中亚热带洞庭湖周边、鄱阳湖周边、皖浙地区24处加积型红土剖面145个样品,并对其粗粒组分(粒径>63μm)开展粗粒矿物磨圆度特征研究,结果表明:1)加积型红土粗粒组分矿物磨圆度与矿物类型有关,棱角状和次棱角状矿物多为长英质碎屑;圆状和次圆状矿物多为赤褐铁矿、钛铁矿等.2)均质红土(HRC)、网纹红土(VRC)的圆度组合类型基本属"尖锥形",且与当地基岩风化物、湖滨风成砂山、河流沉积物样品的圆度组合类型一致;黄棕色土(YB)、网纹黄棕色土(VYB)的圆度组合类型略为复杂.3)以JL剖面为例,加积型红土粗粒组分圆度沿剖面自下而上波动增加,结合以洛川黄土和赣江流域梅江沉积物粗粒组分为端元的物源判别结果,网纹红土粗粒物质来自近源河湖沉积物,而黄棕色土粗粒物质中还混有远源粗颗粒物.
In order to explore the influence of coarse-grained minerals on the source region of aggradated red earth and its environmental significance,the coarse-grained fraction(size>63μm)of 145 samples of 24 aggradatedred earth sections around Dongting Lake,Poyang Lake and Anhui,Zhejiang area were selected to study the characteristics of coarse-grained mineral roundness.It was concluded that:1)The roundness of coarse-grained minerals in aggradated red earth was related to mineral types.The angular and sub-angular minerals were mostly felsic clasts,while the circular and sub-circular minerals were limonite and ilmenite for the most part.2)According to the study of four types of soils found in samples,HRC and VRC were basically"pointed cone"and consistent with those of weathering crust,aeolian sand and river sediments,but YB and VYB appeared somewhat complicated.3)Taking JL profile as an example,the roundness of coarse sand grains of aggradated red earth increased from bottom to top along the section.Based on the analysis of coarse-grained sediments from Luochuanloess and Meijiang River in Ganjiang River basin,it was concluded that the coarse-grained materials of vermicular red clay came from the sediments of near-source rivers and lakes,while the coarse-grained materials of yellow-brown soil were mixed with the coarse-grained matter of far-source.
作者
尹敬文
朱丽东
张晓
李凤全
曾蒙秀
黄颖
熊文婷
王玲玲
王琳怡
YIN Jingwen;ZHU Lidong;ZHANG Xiao;LI Fengquan;ZENG Mengxiu;HUANG Ying;XIONG Wenting;WANG Lingling;WANG Linyi(College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua 321004,China)
出处
《浙江师范大学学报（自然科学版）》
CAS
2020年第3期328-335,共8页
Journal of Zhejiang Normal University:Natural Sciences
基金
国家自然科学基金资助项目(41572345,41971111)
浙江省自然科学基金资助项目(LQ18D020002)。
关键词
加积型红土
粗粒组分
磨圆度
物源
沉积物
aggradated red earth
coarse grain fraction
roundness
provenance
sediment
