Affiliation:
1. Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK.
Abstract
The large variation in the ratio of uranium-234 to uranium-238 (
234
U/
238
U) in rivers is not well understood, but may provide information about past weathering and rainfall and is important because it controls seawater (
234
U/
238
U). Here, we demonstrate the importance of physical weathering and rainfall for (
234
U/
238
U), using rivers from South Island, New Zealand. These data allow interpretation of an existing speleothem (
234
U/
238
U) record and suggest that New Zealand glacier advance 13,000 years ago was influenced by increased rainfall rather than by Younger Dryas–like cooling. A model of seawater (
234
U/
238
U) during glacial cycles indicates that rejection of corals based on modern (
234
U/
238
U) ± <0.01 is not merited and may reject the highest quality ages.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
115 articles.
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