The Lanmuchang Tl deposit and its environmental geochemistry |
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Authors: | ZHANG Zhong CHEN Guoli ZHANG Baogui CHEN Yecai ZHANG Xingmao |
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Institution: | Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China |
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Abstract: | Tl is a dispersed element and it seldom occurs in the form of independent minerals.The world annual production of Tl is about
13 ton, most of which is by-product separated from non-ferrous metal products. Lanmuchang is the only large-size independent
Tl deposit in the world. Bio-enrichment and hydrothermal reworking are the two important metallogenic mechanisms of this Tl
deposit. Samples of plant and animal organs and villagers’ urine as well as hair and nail (toenail) samples from the Tl mining
district were analyzed. Analytical results showed that the contents of Tl, Hg and As are high, suggesting that the residents
and villagers in the mining district have been affected by Tl-Hg pollution, and on the other hand, they can serve as the guidelines
for ore prospecting. The contents of Tl, Hg, and As in human beings and other organic bodies depend largely on the background
values of these metals in rock, ore, soil and water. |
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Keywords: | Tl deposit environmental geochemistry of Hg Tl and As metallogenesis by bio-enrichment metallogenesis by hydrothermal reworking indicators Tl Hg and As pollution |
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