赣南地区花岗岩型红土剖面粒度特征及其环境意义

Grain-size Characteristics and its Environmental Significance of the Granite Red Clay Profile in Gannan Region

采集了赣县田村(TC)花岗岩红土剖面45个样品,分别进行了粒度和化学元素测试分析.研究表明:(1)红土剖面粒度组成以粉砂(4~63μm)为优势粒组,平均含量为52.52%;砂粒(63~2000μm)次之,平均含量为38.38%;粘粒(<4μm)平均含量为9.09%.(2)线性回归分析发现,粘粒和粉砂含量正相关性显著,砂粒含量分别与粘粒、粉砂含量负相关性显著;CIA值与粉砂粒含量正相关性显著的,与砂粒含量负相关性显著.(3)红土粒度频率曲线以单峰为主体,表明了红土剖面物质来源主体的单一性.概率累积曲线表现为三段模式,以及红土样在粒度参数散点图中分布相对集中,揭示红土剖面的沉积环境相对一致性.

Grain-size and chemical elements of forty-five samples were measured from Tiancun(TC)granite red clay profile in Ganxian County.The results showed that:(1)the content of silt particles(4~63μm)was the highest in Tiancun profile,which the average content was 52.52%,followed by sand particles(63~2000μm)and clay particles(<4μm),which the average content was 9.09%and 38.38%respectively.(2)After linear regression analysis,it was found that there was a Remarkably correlative both clay particle content and silt particle content,which was a negative correlation between sand particles content,clay particles content and silt particles content.The CIA values were positively correlated with silt particles content,while negatively correlated with sand particles content;(3)The frequency curves of particle sizes were dominated by single peak,which suggested that the material sources of red clay profile were singleness.The probability accumulation curves of red earth was divided into three segment pattern,and the distribution of particle size parameter scatter plots was relatively consistent,which revealed that the sedimentary environment of red clay profile was relatively consistent.