Illite and kaolinite are reported in dry stream sediments but smectite is totally absent. How to interpret?
Dear Dr. Dawood:
It is not as easy to give an answer to this question as to put it. A rather general answer may be. In the provenance area where the stream sediments have derived from and/or the environment of deposition no alkaline fluid has been operative be it supergene or hypogene in nature. By contrast, kaolinite is indicative of acidic fluids in the environments in question.
Any far-reaching answer would be rather speculative in view of the existing database.
With kind regards
H.G.Dill
It seems the stream does not carry any material from basic igneous rock areas that generally weather to smectite as the first weathering product.
Dear Dr. Dawood;
these papers you can download fom the RG server:
DILL, H.G. (2016) Kaolin: soil, rock and ore From the mineral to the magmatic, sedimentary, and metamorphic environments.- Earth Sciences Reviews 161: 16-129.
DILL, H.G. (2017) Residual clay deposits on basement rocks: The impact of climate and the geological setting on supergene argillitization in the Bohemian Massif (Central Europe) and across the globe.- Earth Sciences Reviews 165: 1-58.
DILL, H.G. (2017) An overview of the pegmatitic landscape from the pole to the equator – Applied geomorphology and ore guides.- Ore Geology Reviews 91: 795 – 823.
Kind regards
H.G.Dill
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