云南省中西部红色风化壳中铂族元素分布特征
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Geochemical Characters of Platinum Group Elements in Regoliths on Middle to West in Yunnan Province
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    摘要:

    近年来,铂族元素以其广泛的地质活动环境受到越来越多的关注,人们对铂族元素的研究也从其在硫化物熔体、硅酸盐熔体和热液流体中的富集成矿行为逐渐延展到其在表生风化过程中的地球化学迁移行为。本文通过对我国云南省中西部潞西菲红、元谋朱布和弥渡金宝山3个具有铂族元素矿化的超基性岩体形成的红色风化壳研究发现,三地风化壳化学风化程度远不及世界上热带、亚热带地区的典型红土风化壳,但是其红土化程度存在依次降低的趋势。分别对三地风化壳铂族元素分析表明,随着风化壳红土化程度的增高,铂族元素富集程度也在增高,并且不同铂族元素在同一风化壳的不同位置也具有不同富集程度,表明伴随着红土化过程,铂族元素在地表风化壳中发生了迁移富集和分异作用。研究发现,低价铁离子对铂族元素络合物的还原作用和高价铁氧化物对铂族元素的吸附作用对铂族元素的重新分配并富集具有重要意义;6个铂族元素不同的地球化学行为导致了其在风化壳中的分异,其中,Rh在红土化过程中的行为和铂族元素整体行为体现高度一致性,因此Rh可以作为表生作用过程中铂族元素的标型元素;Au和铂族元素在红色风化壳中的分布具有一定相似形,根据粘土型Au矿床的存在,推测也有红色粘土型铂族元素矿床的存在。

    Abstract:

    PGE (Platinum Group Elements) act in many geologic environments and more attention is taken to their supergene geochemical behaviors in recent years. Based on the investigation in three red regolith profiles which are developed over the bedrocks of ultrabasic complexes in Feihong in Luxi, Zhubu in Yuanmou and Jinbaoshan in Midu, middle to western Yunnan, the authors find that comparing with the red regoliths in the world, the lateritization degrees in the three regoliths are not high and the highest to lowest degrees are regolith on Feihong>regolith on Zhubu>regolith on Jinbaoshan. According to the PGE contents of samples from these regolith sections, the concentration degree of the PGE is higher accompanying with stronger lateritization. In the same regolith the six elements have different concentration degrees, which indicate that the six elements have concentrated and separated during lateritization. In this process, Fe2+ which can reduce the PGE complex, and minerals including Fe3+ which can adsorb the PGE act as the main positive factors for the PGE concentration. Different geochemical behaviors of the six PGE lead their separation in the red regoliths. During the lateritization, Rh has the very similar characters with all PGE, so Rh may act as typomorphic minerals of the PGE for their supergene geochemical behaviors. PGE and Au have similar distributing characters in the three regoliths, and PGE is a little higher concentration than Au in the three regoliths, so due to the occurrences of red clay type gold deposits in the world there must be some red clay PGE deposits in the world.

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刘英超,杨竹森,田世洪,于玉帅.2011.云南省中西部红色风化壳中铂族元素分布特征[J].地质学报,85(2):272-281.
Liu Yingchao, Yang Zhusen, Tian Shihong, Yu Yushuai.2011. Geochemical Characters of Platinum Group Elements in Regoliths on Middle to West in Yunnan Province[J]. Acta Geologica Sinica,85(2):272-281.

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  • 收稿日期:2009-11-22
  • 最后修改日期:2010-11-09
  • 录用日期:2010-11-29
  • 在线发布日期: 2011-02-11
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