8_continental_environment

8_continental_environment - Part IV Depositional...

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1 Part IV: Depositional Environments A depositional environment is a geomorphic unit in which deposition takes places. Thus, the study of depositional environment is essentially the study of geomorphology, i.e. recognition of geomorphic units . Geomorphic units are recognized by features preserved in ancient sediments.
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1. Definition : A facies is a body of rock characterized by a particular combination of lithology, texture, suite of sedimentary structures, fossil content, colour, geometry, paleocurrent pattern, etc. 2. How is a facies formed? A facies is produced by one or several processes operating in a depositional environment. 3. Description : Facies are best referred to objectively in purely descriptive terms, using a few pertinent adjectives; examples could be cross-bedded, coarse sandstone facies or massive pebbly mudstone facies. 4. Facies association : Groups of facies genetically related to one another and which have some environmental significance can be designate as a facies association. The facies comprising an association are generally deposited in the same broad environment, in which there are several different depositional processes operating. Facies Analysis Facies analysis is to identify geomorphic units in which ancient sediments accumulated. Principles of environmental interpretation and classification
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