Hydrogeochemistry and weathering on the Yilgarn Block, Western Australia—ferrolysis and heavy metals in continental brines
Hydrogeochemistry and weathering on the Yilgarn Block, Western Australia—ferrolysis and heavy metals in continental brines
复制标题
西澳大利亚 Yilgarn 地块的水文地球化学和风化作用——大陆盐水中的铁解和重金属
DOI：
10.1016/0016-7037(83)90131-x
复制
发表时间：
1983
影响因子：
5
通讯作者：
A. Mann
中科院分区：
文献类型：
--
作者：
A. Mann
Groundwater samples collected from salt lakes over the Archean Yilgarn Block of Western Australia, show the influence of climate on geochemical weathering patterns. Major element compositions in salt lake groundwaters, show little systematic trend, but there are marked differences in pH and Fe, Cu, and Pb, concentrations in the alkaline carbonated systems of the arid northeastern part, compared to concentrations of the same elements in groundwater systems of the Mediterranean-type climatic region of the “wheatbelt” in the southwestern part of the block. In this latter region, in addition to higher rainfall input, the groundwater systems have steeper hydraulic gradients, weathering bedrock is closer to the surface, and oxidation and hydrolysis of iron (ferrolysis) is evident in weathering profiles. A combination of vertical diffusion and horizontal groundwater flow is thought to be responsible for the development of ferrolysis and acidity in groundwaters in this region. Anomalously high concentrations of heavy metals, particularly lead, are observed in some of the acid-saline groundwaters. The formation of laterite, which is a ubiquitous feature of the Yilgam Block landscape, is a process probably closely linked to ferrolysis.
