地质与资源2026，Vol.35Issue(1)：115-122,8.DOI:10.13686/j.cnki.dzyzy.2026.01.011
岷江上游干旱河谷区汶川段岩-土系统元素地球化学特征
Elemental geochemistry of the rock-soil system in Wenchuan section of the arid valley,Upper Minjiang River
摘要
Abstract
The geochemical characteristics of elements in surface environments are closely related to their parent bedrock,leading to significant differences in soil compositions derived from various rock types.This study investigated vertical bedrock-soil profiles with three types of parent rocks in Wenchuan section of the arid valley in the upper reaches of Minjiang River.A total of 18 bedrock and soil samples were collected and analyzed for their major and trace element concentrations to characterize their geochemistry and to examine element distribution and migration between bedrock and soil.The results indicate that soils developed from the three bedrock types differ significantly in CaO and Na2O contents.Elements with higher concentrations in the bedrock generally maintain higher levels in the overlying soil.The average contents of trace elements in soils decrease in the order Mn＞Zn＞Cu＞Se,while the heavy metals follow the sequence Cr＞Pb＞As＞Cd＞Hg,consistent with their abundance patterns in the bedrock.Among the heavy metals,only Cd and Pb slightly exceed the risk control standards for agricultural soil pollution.Within the bedrock-soil system,soils derived from granite show depletion of Al2O3,K2O,Na2O,and SiO2;soils from phyllite are enriched in CaO and Na2O but depleted in Zn,Cr,and Pb;and soils from crystalline limestone exhibit enrichment of most elements except for Ca,which undergoes leaching and migration.关键词
干旱河谷/岩-土系统/元素地球化学/迁移富集/岷江Key words
arid valley/rock-soil system/elemental geochemistry/migration and enrichment/Minjiang River分类
天文与地球科学引用本文复制引用
周雪妮,巴仁基,计扬,曹亚廷,李小红,刘磊..岷江上游干旱河谷区汶川段岩-土系统元素地球化学特征[J].地质与资源,2026,35(1):115-122,8.基金项目
中国地质调查局项目"岷江上游干旱河谷区生态保护修复支撑调查"(编号DD20220955). （编号DD20220955）
