The statistics of helium isotopes along the global spreading ridge system and the central limit theorem

被引：24

作者：

Anderson, DL ^{[1
]}

机构：

[1] CALTECH, Seismol Lab 252 21, Pasadena, CA 91125 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2000年 / 27卷 / 16期

关键词：

D O I：

10.1029/1999GL008476

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

An unbiased estimate of the arithmetic mean of the He-3/He-4 ratio (R) of basalts from the global spreading ridge system is 9.14 +/- 3.59 Pa (n=503), where Pa is the atmospheric ratio and n is the number of data points. The +/- two standard deviation (2 sigma) range covers much of the oceanic island and continental flood basalt data that have been attributed to 'plume' or 'lower mantle' components. The highest R values along the ridge system are associated with new ridges, backarc basins and near-ridge seamounts. Low values are associated with long-lived or abandoned ridges. The median, a more robust measure of the average, is 8.51 Ra.

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页码：2401 / 2404

页数：4

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