APPLICATION OF HIGH RESOLUTION ELECTRON MICROSCOPY TO SOIL CLAY ORIGIN AND ORGANIZATION IN A TEMPERATE CLIMATE

Rok, strany: 1992, 55 - 61

Soil clay most commonly encountered in temperate regidns can be defined as a complex assemblage resulting from combined degradation and aggradation phenomena during paleoalteration and present day weathering. High resolution and analytical electron microscopy have been used to investigate clay texture and crystallochemistry of primary minerals and their alteration by products. Illites occur under two main facies: micromica and illite stricto sensu. Micromicas of clay size come from the microdivision of former larger micas, involving both mechanical and chemical alteration processes. Their composition is close to that of micas with a high K content (around 10 %). Illite stricto sensu is from sedimentary origin, typically barrel shaped, with 5–7 layers and heterogeneous in composition with a moderate K content (around 7 %). Mixed layer clays are also of two different types. The structural type, either ordered or semi-ordered is produced by alteration of micas. It displays an irregular opening of interlayer spaces due to the leaching of K. The textural type is disordered and formed by subparallel aggregation of small size units (1–4 layers) into quasicrystals. Clay organization appears to be closely related to the origin of the clay minerals.

ISO 690:

Elsass, F., Robert, M. 1992. APPLICATION OF HIGH RESOLUTION ELECTRON MICROSCOPY TO SOIL CLAY ORIGIN AND ORGANIZATION IN A TEMPERATE CLIMATE. In Geologica Carpathica Clays, vol. 1, no.2, pp. 55-61.

APA:

Elsass, F., Robert, M. (1992). APPLICATION OF HIGH RESOLUTION ELECTRON MICROSCOPY TO SOIL CLAY ORIGIN AND ORGANIZATION IN A TEMPERATE CLIMATE. Geologica Carpathica Clays, 1(2), 55-61.