Welcome to visit Geoscience!

Geoscience ›› 2021, Vol. 35 ›› Issue (02): 412-424.DOI: 10.19657/j.geoscience.1000-8527.2021.02.11

• Geochemistry • Previous Articles     Next Articles

Characteristics and Genesis of Soil Geochemical Baselines in Western Yunnan Province

WANG Qiaolin1,2,3(), SONG Yuntao1,2,3, LÜ Xupeng4, PENG Min1,2,3, ZHOU Yalong1,2,3, HAN Wei1,2,3, WANG Chengwen1,2,3   

  1. 1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China
    2. Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang, Hebei 065000, China
    3. Key Laboratory of Geological Cycling of Carbon and Mercury in the Earth’s Critical Zone,Chinese Academy of Geological Sciences,Langfang, Hebei 065000, China
    4. Yunnan Institute of Geological Survey, Kunming,Yunnan 650216, China
  • Received:2020-07-31 Revised:2020-08-25 Online:2021-04-25 Published:2021-05-25

Abstract:

Based on the geochemical survey data of land quality in western Yunnan Province, the median with robust characteristics was used to represent the geochemical baselines of 52 elements in deep soil. The distribution and enrichment and dilution features of elements in different parent materials and land use types were compared and analyzed. The causes of geochemical baselines were further analyzed from the perspective of element combination characteristics by factor analysis mechanism. The results showed that the baselines of iron group elements, chalcophile elements, mineralizer and halogen elements, rare, scattered, rare earth metal elements, radioactive elements, tungsten molybdenum group elements and rock-forming elements in the study area were higher than those of national geochemical baselines; the baseline values of alkaline earth metals were significantly lower, of which CaO and Na2O only with 13% and 7% of the national level; soil parent material was the main control factor of soil element baseline values. The high baselines of TFe2O3, V, Co and Cr were mainly controlled by basic parent rocks, W, Sn and Pb were mainly related to the high temperature magmatic mineralization, the life elements including C, N, S, P and Se were related to land use types and supergene geochemical cycle. The results showed that the types of parent rock, weathering leaching, mineralization, bioaccumulation and physicochemical adsorption of clay jointly affect the characteristics of soil baselines, among which the weathering of parent rocks had an important influence. The results provide foundational geochemical information for regional resource and environment assessment.

Key words: geochemical baseline, factor analysis, deep soil, element, western Yunnan Province

CLC Number: