Geochemical Partitioning in Till
نویسنده
چکیده
and Vagners (1971, 1972) expressed this phenomenon elegantly by introducing the concept of "terminal mode" for the optimum grain size to which a mineral can be reduced, given the force and energy typically available in the glacial environment. Thus, hard, uncleaved or poorly cleaved minerals such as quartz, fcldspar, garnet, pyrite and magnetite dominate either the medium or the fine sand fraction of glacial sediments, depending on their grain size in the source rocks; calcite, dolomite and gypsum have their terminal modes in the silt sizes because of their softness or good clcavage; clay minerals, micas and other phyllosilicates, serpentine, and hematite, because of their excellent cleav-
منابع مشابه
Geochemical - mineralogical profiles through fresh and weathered till
To use glacial sediments effectively in mineral exploration, it is necessary to understand the causes of vertical compositional variability, whether they are sedimentologic, stratigraphic, or diagenetic. Many useful sedimentologic models are recorded in recent literature, particularly for till and related diamictons, and the importance of understanding contrasting compositions of different stra...
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Geochemical controls on the partitioning and hydrological transport of metals
Introduction Conclusions References
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