攀枝花地区昔格达组土壤中微量元素地球化学分异特征

Geochemical variation of trace elements in soils from the Xigeda Formation of the Panzhihua region, China

昔格达组在攀枝花地区分布广泛,并成为该区居民的主要集散地和工农业活动区。对昔格达组粘土中微量元素的空间分布及分异特征研究的结果表明(1)土壤的粒度、矿物组成及成土作用是影响土壤中微量元素浓度的重要条件;(2)人类工矿开发活动是制约土壤中微量元素区域分布形式的重要因素;(3)土壤在不同层位的分异及组合特征既与成土母质有关,也受人为活动的影响。

The Xigeda Formation is the famous sequential sedimentary late Cenozoic stratum and distributed extensively over the southwest of China. The Xigeda Formation is called lifeline because it supplies most agricultural products in the Panzhihua region. A gochemical investigation was carried out in study area to determine the variation of trace elements in the Xigeda Formation. The main objective of this study is to compare the influences of pedogenesis and anthropogenic activities on the soil. The results show that: (1) the geochemical variation and distribution of trace elements are influenced by grain size, mineral composition and pedogenesis of the soil; (2) the distribution pattern of trace elements is controlled by anthropogenic inputs; (3) the assemblage of trace elements is determined by not only the mother materials of the soil but also the human being activities.