Sokoine University of Agriculture

Clay mineralogical composition and its influence on some physico-chemical properties of selected soils of Coast region, Tanzania

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dc.contributor.author Mgata, E. S.
dc.contributor.author Msanya, B. M.
dc.date.accessioned 2017-06-03T12:40:34Z
dc.date.available 2017-06-03T12:40:34Z
dc.date.issued 1995
dc.identifier.uri http://www.suaire.suanet.ac.tz:8080/xmlui/handle/123456789/1550
dc.description Article en_US
dc.description.abstract A mineralogical study was carried out in Coast Region, Tanzania, on soils developed from different parent materials. These materials are; unconsolidated sands and gravels of Neogene age, Grey-green marls of Cretaceous age, Calcareous silt stone and sandstone of Jurassic age and migmatitic gneisses of Precambrian age (Usagaran system). The soil clay fractions exhibit pertinent differences in mineralogical composition. Soils developed from migmatitic gneisses are predominantly kaolinitic with accessory amount of goethite. Kaolinite in these soils is pedogenic and is formed from feldspars and mica. Soils formed from calcareous siltstone and sandstone have mixed clay mineralogy including smectite, vermiculite and illite. Both smectite and vermiculite in these soils are pedogenic and are formed from mica, while illite is inherited from the parent materials. Soils developed from the grey-green marls are dominated by smectite and have some accessory amounts of kaolinite and illite; while those developed from tertiary sediments are characterized by mixed clay mineralogy including smectite, kaolinite and traces of gibbsite. The pedogenic environment suggests that both kaolinite and smectite in these soils are not formed insitu but are inherited from transported parent materials. The clay mineralogy is clearly reflected on the cation exchange capacity, moisture retention characteristics and carrying capacity (n value) of these soils en_US
dc.language.iso en en_US
dc.subject Chemical properties en_US
dc.subject Clay mineralogy en_US
dc.subject Coast Region en_US
dc.subject Physical properties en_US
dc.subject Tanzania en_US
dc.title Clay mineralogical composition and its influence on some physico-chemical properties of selected soils of Coast region, Tanzania en_US
dc.type Article en_US
dc.url http://agris.fao.org/agris-search/search.do?recordID=KE2007200224 en_US


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