Climatic control of riverine and Seawater uranium-isotope ratios

被引：107

作者：

Robinson, LF ^{[1
]}

Henderson, GM ^{[1
]}

Hall, L ^{[1
]}

Matthews, I ^{[1
]}

机构：

[1] Univ Oxford, Dept Earth Sci, Oxford OX1 3PR, England

来源：

SCIENCE | 2004年 / 305卷 / 5685期

关键词：

D O I：

10.1126/science.1099673

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The large variation in the ratio of uranium-234 to uranium-238 (U-234/U-238) in rivers is not well understood, but may provide information about past weathering and rainfall and is important because it controls seawater (U-234/U-238). Here, we demonstrate the importance of physical weathering and rainfall for (U-234/U-238), using rivers from South Island, New Zealand. These data allow interpretation of an existing speleothem (U-234/U-238) 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 (U-234/U-238) during glacial cycles indicates that rejection of corals based on modern (U-234/U-238) +/- < 0.01 is not merited and may reject the highest quality ages.

引用

页码：851 / 854

页数：4

共 41 条

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