Sulphide oxidation under partially anoxic conditions at the bed of the Haut Glacier d'Arolla, Switzerland
Sulphide oxidation under partially anoxic conditions at the bed of the Haut Glacier d'Arolla, Switzerland
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DOI：
10.1002/hyp.1012
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发表时间：
2002-08-30
影响因子：
3.2
通讯作者：
Tranter, M
中科院分区：
文献类型：
--
作者：
Bottrell, SH;Tranter, M
提供了瑞士瓦莱州上阿罗拉冰川的大量冰川融水及其中所含硫酸盐的氧同位素数据，试图评估冰下化学风化环境的氧化还原状态。冰下化学风化产生的硫酸盐在 O-18 中消耗殆尽，因此它一定是（至少部分）在缺氧环境中形成的。在这些条件下，Fe3+ 可以充当氧化剂，并且掺入硫酸盐中的氧原子源自 O-18 耗尽的水分子（相比之下，溶解的 O-2 在 O-18 中强烈富集）。因此，这些数据支持这样的假设：冰川床的某些部分是缺氧的，并且 Fe3+ 在这些条件下可能充当重要的氧化剂。版权所有 (C) 2002 John Wiley Sons, Ltd.
Oxygen isotopic data are presented for bulk glacial meltwaters draining the Haut Glacier d'Arolla, Valais, Switzerland and for the sulphate contained within them in an attempt to assess the redox status of the subglacial chemical weathering environment. The sulphate derived from subglacial chemical weathering is so depleted in O-18 that it must have formed, at least partially, in an anoxic environment. Under these conditions, Fe3+ can act as an oxidizing agent and oxygen atoms incorporated into sulphate are derived from O-18-depleted water molecules (by contrast, dissolved O-2 is strongly enriched in O-18). These data therefore support the hypothesis that sectors of the glacier bed are anoxic and that Fe3+ may act as a significant oxidizing agent under these conditions. Copyright (C) 2002 John Wiley Sons, Ltd.