Regressive diagenesis in Pleistocene eolianites from Fuerteventura, Canary Islands
Regressive diagenesis in Pleistocene eolianites from Fuerteventura, Canary Islands
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加那利群岛富埃特文图拉岛更新世风成岩的回归成岩作用
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
G. Tietz
中科院分区：
文献类型：
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作者：
G. Müller;G. Tietz
来自加那利群岛富埃特文图拉岛晚更新世风成岩的证据表明，在陆上环境中，低镁方解石取代的红藻碎屑显示出其原始的高镁方解石矿物学的部分重新组成时，他们随后暴露于海水。这一过程只影响红藻的细胞壁，由于其特殊的微结构（极小的晶体尺寸，非常大的比表面积），为溶解-再沉淀或扩散过程提供了最有利的条件。
高镁方解石作为第二代水泥沉淀在淡水方解石水泥上，相当于高镁方解石水泥，在岛上许多地方导致全新世潮间带沉积物中海滩岩的形成。
Evidence from a Late Pleistocene eolianite in Fuerteventura, Canary Islands, demonstrates that red algal clasts replaced by low-magnesian calcite in the subaerial environment show a partial re-constitution of their original high-magnesian calcite mineralogy when they are exposed subsequently to sea water. This process only affects the cell walls of the red algae, which, owing to their specific microarchitecture (extremely small crystal size, very large specific surface area), offer the most favourable conditions for dissolution-reprecipitation or diffusion processes.
High-magnesian caicite precipitated as a second generation cement on fresh water calcitic cement is an equivalent of the high-magnesian calcite cement which at many locations on the island leads to the formation of beachrock in Holocene intertidal sediments.