Some aspects of volcanic ash layers in the Central Indian Basin.
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Intercalated volcanic ash layers in two deep-sea sediment cores from the Central Indian Basin (CIB) are examined for the possibility of an in situ source of suboceanic volcanism. An in situ source has been predicated based on the bottom morphological structures and activation of seamounts during the geological past. The tentative correlation between depositional ages of the ash layer horizons and the period of global climatic cooling events reinforces the hypothesis that the suboceanic volcanic episode might have been initiated during the onset of glaciation. The sedimentary record of intercalated volcanic ash layers in cores F200B and F88B from the CIB at different depth intervals has been examined. The downcore intercalated volcanic ash layers are composed primarily of glass shards (broken, common bubble, and pumiceous types) (Gupta 1988). The depositional ages of the ash layers have also been estimated to see whether a meaningful geological significance exists in their time of burial. Cores F200B and F88B were collected from an area of siliceous ooze (water depth 5400 m) in the CIB. These cores are 90 and 86 cm in length, respectively. Core F200B is from the flank of the 76.3 degrees E fracture zone; core F88B is located about 50 km to the east of the fracture zone
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