ISOTOPIC EVIDENCE FOR URANIUM EXCHANGE DURING LOW-TEMPERATURE ALTERATION OF OCEANIC BASALT

被引：37

作者：

MACDOUGALL, JD ^{[1
]}

FINKEL, RC ^{[1
]}

CARLSON, J ^{[1
]}

KRISHNASWAMI, S ^{[1
]}

机构：

[1] PHYS RES LAB,AHMEDABAD 380009,INDIA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1979年 / 42卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0012-821X(79)90187-0

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Measurements of uranium concentration and the 234U/238U activity ratio in oceanic basalts which have undergone low-temperature seafloor alteration indicate that uranium uptake is a pervasive occurrence but that the various phases involved behave differently with respect to this process. Palagonite exhibits uranium contents 8-20 times higher than unaltered glass coupled with low 234U/238U, suggesting ongoing preferential leaching of 234U. Altered crystalline interiors of several old basalts have 234U/238U > 1, indicative of recent uranium exchange with seawater. The data also provide evidence for uranium sources with 234U/238U higher than the seawater value of 1.14. Manganese crusts on basalts of a variety of ages have isotopic ratios indicating that they either are recent deposits or also have experienced continuing uranium exchange with seawater. © 1979.

引用

页码：27 / 34

页数：8

共 20 条

[1] URANIUM CONTENT OF MID-OCEANIC BASALTS [J].