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- W2074653523 abstract "The chemical composition of twenty-eight microscopic glassy objects, found in a deep-sea sediment core taken near the Ivory Coast, has been determined by electron microprobe analysis. Like the Australasian microtektites, these glassy objects can be divided into two main groups. One group is composed of individuals with chemical compositions similar to tektites. These are referred to as “normal” microtektites. The other group is composed of bottle-green glassy objects with low silica contents (<53 %) and high MgO contents (16–21 %). The “normal” Ivory Coast microtektites are similar in composition to Ivory Coast tektites and like Ivory Coast tektites, they differ from the Australasian tektites and microtektites by having a high MgOCaO ratio (>3) and an average Na2OK2O ratio greater than unity. Although the bottlegreen objects differ from the “normal” microtektites in their appearance, physical properties and chemical compositions, they are nevertheless found in association with them and are probably therefore related to them. Both the Ivory Coast and Australasian microtektites have higher MgO and lower Na2O contents than igneous glasses with comparable SiO2 contents. The chemical data presented in this paper are interpreted as confirming a previous suggestion that the glassy objects found in deep-sea sediments near the Ivory Coast are microtektites and that they represent a portion of the Ivory Coast tektite strewn field." @default.
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- W2074653523 date "1969-09-01" @default.
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- W2074653523 title "Chemical composition of Ivory Coast microtektites" @default.
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- W2074653523 doi "https://doi.org/10.1016/0016-7037(69)90069-6" @default.
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