I. Ancient Arctic Ice Does Not Contain Large Excesses of Natural Lead. II. Chronological Variations in Lead and Barium Concentrations and Lead Isotopic Compositions in Sediments of Four Southern California Off-Shore Basins
Part I This study settled the dispute and proved beyond doubt that excess lead today is 300-fold instead of the 5-fold, as proposed by other investigators, greater than prehistoric time. And, virtually all of the present-day excess of lead above natural levels was shown to be caused by industrial le...
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Format: | Thesis |
Language: | English |
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1982
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Online Access: | https://thesis.library.caltech.edu/3203/ https://thesis.library.caltech.edu/3203/3/ng_ca_1982.pdf https://resolver.caltech.edu/CaltechETD:etd-08232006-143453 |