Thallium (Tl) is a dispersed element and it seldom occurs in the form of independent minerals. So the element is hard to form any independent deposit. The world annual production of Tl is about 13 ton, most of which i...Thallium (Tl) is a dispersed element and it seldom occurs in the form of independent minerals. So the element is hard to form any independent deposit. The world annual production of Tl is about 13 ton, most of which is recovered as by\|product from non\|ferrous metal metallurgical products. Reported in this paper is the only large\|sized independent Tl deposit in the world, of which the Tl ores can be mined, ore\|dressed and smelted independently. Bio\|enrichment and hydrothermal reworking are the two important metallogenic mechanisms of this Tl deposit. This paper will give a discussion to the Lanmuchang Tl deposit in the following respects including its geological characteristics, element association of Tl, Hg, As and Au and W, sulfur isotopic composition, involvement of hallogens in metallogenesis and the metallogenic models.展开更多
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 ...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 Ti-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.展开更多
Starting with the research status of bio-metallogenesis of Tl deposits and their geology, this work deals with the geological background of Tl enrichment and mineralization and the mechanism of bio- metal-logenesis of...Starting with the research status of bio-metallogenesis of Tl deposits and their geology, this work deals with the geological background of Tl enrichment and mineralization and the mechanism of bio- metal-logenesis of Tl deposits, as exemplified by Tl deposits in the low-temperature minerogenetic province. This research on the bio-metallogenesis of Tl deposits is focused on the correlations between bio-enrichment and Tl, the enrichment of Tl in micro-paleo-animals in rocks and ores, bio-fossil casts in Tl-rich ores, the involvement of bio-sulfur in minerogenesis and the enrichment of bio-genetic organic carbon in Tl ores. Thallium deposits have experienced two ore-forming stages: syngenetic bio- en-richment and epigenetic hydrothermal reworking (or transformation). Owing to the intense epigenetic hydrothermal reworking, almost no bio-residues remain in syngenetically bio-enriched Tl ores, thereby the Tl deposits display the characteristics of hydrothermally reoworked deposits.展开更多
文摘Thallium (Tl) is a dispersed element and it seldom occurs in the form of independent minerals. So the element is hard to form any independent deposit. The world annual production of Tl is about 13 ton, most of which is recovered as by\|product from non\|ferrous metal metallurgical products. Reported in this paper is the only large\|sized independent Tl deposit in the world, of which the Tl ores can be mined, ore\|dressed and smelted independently. Bio\|enrichment and hydrothermal reworking are the two important metallogenic mechanisms of this Tl deposit. This paper will give a discussion to the Lanmuchang Tl deposit in the following respects including its geological characteristics, element association of Tl, Hg, As and Au and W, sulfur isotopic composition, involvement of hallogens in metallogenesis and the metallogenic models.
文摘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 Ti-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.
基金the National Natural Science Foundation of China (Grant No. 40372047)
文摘Starting with the research status of bio-metallogenesis of Tl deposits and their geology, this work deals with the geological background of Tl enrichment and mineralization and the mechanism of bio- metal-logenesis of Tl deposits, as exemplified by Tl deposits in the low-temperature minerogenetic province. This research on the bio-metallogenesis of Tl deposits is focused on the correlations between bio-enrichment and Tl, the enrichment of Tl in micro-paleo-animals in rocks and ores, bio-fossil casts in Tl-rich ores, the involvement of bio-sulfur in minerogenesis and the enrichment of bio-genetic organic carbon in Tl ores. Thallium deposits have experienced two ore-forming stages: syngenetic bio- en-richment and epigenetic hydrothermal reworking (or transformation). Owing to the intense epigenetic hydrothermal reworking, almost no bio-residues remain in syngenetically bio-enriched Tl ores, thereby the Tl deposits display the characteristics of hydrothermally reoworked deposits.
