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Geochemical background on the super-richening of disperse metal elements on the western margin of the Yangtze plate TEXT SIZE: A A A
Disperse metal mineral resources is an important part of the disperse, rare metal, and rare earth mineral resources. It is strategic significant to the national economy, national security and technology progress. In addition, disperse metal not only is the functional and structural materials in next generation information technology, biotechnology, high-end equipment manufacturing, new materials and new energy vehicles, but also is essential support material in modern industry, national defense and advanced technology fields. Disperse metal was too diffuse to mineralize relative to other bulk metal and disperse elements were concentrated to mineralization through more complicated geologic process under a special geochemical background. Preliminary research indicates that disperse elements (In, Ge, Ga) were super-richen on the western margin of the Yangtze plate and a rare ore-concentrated area of disperse metal was form in the world. Geologists use the ore-concentrated area as natural laboratories to study disperse metal deposit. So, what is the special geochemical background that motivates all kinds of disperse metal deposits to gather on the western margin of the Yangtze plate? To solve this problem, a Proterozoic-Mesozoic section measured in Guizhou area, as a typical area of the western margin of the Yangtze plate, was investigated systematically in this paper. The test results of Proterozoic strata show that the average value of Ga, Ge, Se, Cd, In, Te, Re and TI was 9. 71 x 10(-6), 0. 30 x 10(-6),1. 71 x 10(-6), 0. 48 x 10(-6), 0. 07 x 10(-6), 0. 10 x 10(-6), 0. 015 x 10(-6 )and 0. 29 x 10(-6), respectively; The test results of Paleozoic strata show that the average value of Ga, Ge, Se, Cd, In, Te, Re and Tl was 14.70 x 10(-6), 0. 35 x 10(-6), 2.36 x 10(-6), 0.23 x 10(-6), 0.06 x 10(-6), 0.08 x 10(-6), 0.014 x 10(-6), 0.69 x 10(-6), respectively; The test results of Mesozoic strata show that the average value of Ga, Ge, Se, Cd, In, Te, Re and Tl was 9. 063 x 10(-6), 0.216 x 10(-6), 2.475 x 10(-6), 0. 065 x 10(-6), 0. 042 x 10(-6), 0.068 x 10(-6), 0.003 x 10(-6), 0. 112 x 10(-6), respectively. Based on the distribution characteristics of disperse metal deposits in the research area, the data indicate that the Precambrian basement in the western margin of the Yangtze block (except Ge) has a low background value of dispersed elements content. The Early Cambrian is an important period of enrichment of dispersed elements, possibly related with the black shale system this time. The widely distributed Emeishan basalt generally has a high background value of dispersed elements contents, which might be an important source of some dispersed metals deposit. The Se-, Cd-, Ga-bearing stratum has a good relationship with the high background contents stratum. The relationship is not obvious for other dispersed elements, but the lower part of the ore-bearing stratum is generally has a high background content, reflecting the shallow or near-source characteristics of metallogenic material. Geochemical background values tested from the most of the different strata was only reported in this paper. In addition, coupling relationship between disperse metal geochemical background and the deposits was preliminary study. With the development of disperse metal deposit, more geological information and regularity of ore formation would be revealed in the future. Nevertheless this paper helps lay the groundwork for further study and it has great meaning both in theory and reality.
 

Publication name

 ACTA PETROLOGICA SINICA Volume: 35 Issue: 11 Pages: 3355-3369 DOI: 10.18654/1000-0569/2019.11.06 Published: 2019

Author(s)

 Du ShengJiang; Wen HanJie; Zhu ChuanWei; Luo ChongGuang; Zhou ZhengBing; Yang ZhiMing; Chen JianShu; Zhu Xun

Corresponding author(s) 

 WEN Hanjie 
 wenhanjie@vip.gyig.ac.cn  
 Chinese Acad Sci, Inst Geochem, Guiyang 550081, Peoples R China 
 Univ Chinese Acad Sci, Beijing 100049, Peoples R China

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