Occurrence of iron silicate oolites in Mahanadi deltaic sediments of Orissa, India

概要

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Extensive occurrence of iron silicate oolites have been observed in the Upper Pleistocene subsurface sediments of Mahanadi delta along Orissa coast. They are usually associated with dark grey to black, shell-bearing marine deposits now occuring inland at depths ranging from 100 to 300m beneath the present ground level. They show concentric layering with or without a nucleus and are believed to have been formed by the precipitation in amorphous state of hydrous iron silicates of variable composition approximating between glauconite and chamosite. They were deposited in a shallow marine reducing environment.
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