天山北坡乌鲁木齐至沙湾地区富硒土壤地球化学特征及成因探讨

A discussion on the geochemical features and origin of selenium-rich soil on the northern slope of the Tianshan Mountains from Urumqi to Shawan County

通过开展多目标区域地球化学调查,发现新疆天山北坡乌鲁木齐至沙湾地区分布大面积的富硒土壤,硒含量水平较高,且富硒土壤中多种肥力元素含量较丰富。研究发现硒主要富集在表层土壤中,与有机质含量呈正相关关系;认为硒主要来源于成土母质,但决定硒富集的主控因素是当地典型河湖沉积相的表生地球化学环境。

Based on the multi-purpose regional geochemical survey,the authors discovered a large area of selenium-rich soils on the north slope of the Tianshan Mountains in Xinjiang from Urumqi to Shawan County. The selenium content is relatively high,and a variety of fertile elements are rich. The study shows that the selenium is mostly distributed in the surface soil and exhibits the positive correlation with the organic content. It is indicated that the selenium originates in parent soil materials while the enrichment state of selenium depends on the supergene geochemical circumstance of local fluvio-lacustrine deposits.