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. 2021 Jan 11;11:440. doi: 10.1038/s41598-020-79864-0

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

The upper is the mineral geological map of key areas, the middle is the 2nd, 3rd and 14th component combination of MNF, the lower is the 6th, 7th and 8th component combination of MNF. This figure is generated by Yu-Hai Fan, Mou-shun Jin using ENVI (version4.3) created by the ENVI Team under an open license (http://www.enviidl.com/).