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- W2024587932 abstract "Abstract Eleven cores containing volcanic detritus, taken from the bottom of the South Atlantic between the South Sandwich Islands and the Mid-Atlantic Ridge, have been examined. The mineralogical composition, texture, type of transportation and the source of the volcanic detritus are discussed. Black volcanic sand layers and olivine-rich basaltic sand occur interbedded and mixed with diatomaceous ooze which is the predominant sediment in the cores. Thick black sand layers composed of basaltic ash and deposited by turbidity currents occur in the cores in the South Sandwich Islands area. Several volcanic ash layers occur in the cores east of the South Sandwich Islands and can be traced a distance of 400 miles towards the Mid-Atlantic Ridge. Three ash layers can be correlated on the basis of refractive index. The thickness and the grain size of the tephra decrease eastward from the South Sandwich Trench for 400 miles. Beyond this area tephra is dispersed in other sediment and does not form discrete layers. The tephra which consists of a mixture of brown volcanic glass, minerals, and rock fragments is most probably derived from andesite-basaltic and basaltic eruptions in the South Sandwich Islands. A study of the diatom floras indicates that the last tephra fall occurred subsequent to the last cold period, that the middle fall occurred during the penultimate warm period and that the lower tephra fell during the penultimate cold period." @default.
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- W2024587932 date "1964-08-01" @default.
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- W2024587932 title "South Sandwich tephra in deep-sea sediments" @default.
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