Earth Science Frontiers ›› 2020, Vol. 27 ›› Issue (3): 202-221.DOI: 10.13745/j.esf.sf.2020.4.4

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Background values of 69 elements in catchment sediments of the China-Mongolia boundary region

LIU Hanliang1,2,3(), NIE Lanshi1,2,3,*(), SHOJIN Davaa4, WANG Xueqiu1,2,3, CHI Qinghua1,2,3   

  1. 1. Key Laboratory of Geochemical Exploration, Ministry of Natural Resources, Langfang 065000, China
    2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
    3. UNESCO International Centre on Global-scale Geochemistry, Langfang 065000, China
  • Received:2020-01-15 Revised:2020-03-15 Online:2020-05-20 Published:2020-05-20
  • Contact: NIE Lanshi

Abstract:

The Sino-Mongolian border area has excellent ore-forming geological conditions and is one of the world's important metal mineralization provinces and one of the world's three major porphyry copper (gold and molybdenum) metallogenic belts. We collected a large amount of geochemical data from the Sino-Mongolian cooperation project on a geochemical mapping at 1∶1000000 scale, which provides basic data for the study of elemental dispersion and enrichment, mineralization trends, resource evaluation and environmental changes in the border area, and also supports decision making in resource layout for the ‘One Belt One Road’. We calculated background values of 69 elements in catchment sediments based on the mapping data across the China-Mongolia boundary. We used the median values of the dataset (using 3-sigma control limits) as the estimated geochemical background values. The results showed that different geological backgrounds led to different geochemical distribution patterns, and different tectonic units had significantly different geochemical characteristics. The massive elemental accumulation provides sufficient elemental supply to forming large deposits of specific geochemical province. These background values can be used as the basic reference data for comparing further development and utilization of geochemical mapping data across the China-Mongolia boundary.

Key words: background values of 69 elements, catchment sediments, regional concentration coefficient, geochemical mapping, China-Mongolia boundary

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