物探与化探2024，Vol.48Issue(3)：597-608,12.DOI:10.11720/wtyht.2024.1255
岷江上游干旱河谷区汶川段风化壳剖面元素地球化学特征
Element geochemical characteristics of weathering crust profiles of the Wenchuan section in the upper arid valley of the Minjiang River
摘要
Abstract
This study conducted geochemical tests and analyses for vertical rock-soil profiles with different bedrock types in the Wen-chuan section in the upper arid valley of the Minjiang River.Based on the above,this study explored the vertical distributions of ele-ments in these weathering crust profiles to investigate the influence of bedrocks on the contents of chemical elements in soils.From a geological perspective,this study provided proposals for planting in agricultural production and eco-environmental restoration for the study area.The results of this study are as follows:(1)From top to bottom,weathering crust profiles can be divided into four layers:the humus layer(A),the illuvial layer(B),the soil parent material layer(C),and the bedrock layer(R).The humus layers exhib-it higher average values of Al,Ca,K,Mg,Fe,Se,Zn,Cu,Cd,and Pb and lower average values of Si,Na,Mn,Cr,As,Cd,and Hg,compared to corresponding national average values in soils;(2)In weathering crust profiles with different bedrock types,except for elements with higher contents in both bedrocks and corresponding soil layers,the same elements manifest similar contents in other soil layers;(3)The chemical weathering intensity increased from the bedrock to the humus layers,with soil weathering degrees gener-ally higher than bedrock weathering degrees;(4)In addition to characteristics inherited from soil parent materials,elements in weathe-ring crust profiles show content differentiation,characterized by enriched Al,K,and Se in humus layers,enriched Na,Fe,Si,Pb,Cu,Zn,Mn,As,Cd,Cr,and Hg in illuvial layers,and enriched Mg and Ca in soil parent material layers.关键词
干旱河谷/岩石—土壤/元素特征/种植建议Key words
arid valley/rock-soil/elemental characteristic/planting proposal分类
天文与地球科学引用本文复制引用
周雪妮,曹亚廷,计扬..岷江上游干旱河谷区汶川段风化壳剖面元素地球化学特征[J].物探与化探,2024,48(3):597-608,12.基金项目
中国地质调查局军民融合地质调查中心项目(DD20220955) （DD20220955）
