Grain coarsening and hydrothermal alteration in metacarbonates of the Damara Orogen, Namibia
Gross, Christian J.
Universitätsverlag Göttingen
Article in Anthology
Verlagsversion
Deutsch
Gross, Christian J., 2006: Grain coarsening and hydrothermal alteration in metacarbonates of the Damara Orogen, Namibia. In: Philipp, S.; Leiss, B; Vollbrecht, A.; Tanner, D.; Gudmundsson, A. (eds.): 11. Symposium "Tektonik, Struktur- und Kristallingeologie"; 2006, Univ.-Verl. Göttingen, p. 75 - 79., , DOI: 10.23689/fidgeo-1904.
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Grain coarsening is a process that occurs
in a wide variety of rock types. The
application of grain growth theory to
natural geologic materials has its beginnings
in the theoretical foundations of
the metallurgical and material sciences.
Two types of grain growth can be statistically
defined: 1) normal grain growth
describing a uniform grain structure and
2) abnormal grain growth, where some
grains grow more rapidly in size at the expense of matrix grains, thus creating
a bimodal grain size distribution.
This study aims to understand the grain
coarsening phenomenon in metacarbonate
rocks, to determine the mechanisms
involved and to elucidate the role of fluids
(e.g. hydrothermal alteration).
Metacarbonate units exhibiting coarsely
crystalline fabrics, representing abnormal
grain growth, and hydrothermal
alteration have been investigated from
two major geologic formations of the
Damara Orogen (Namibia)...