Lunar impact history from 40Ar/39Ar dating of glass spherules

被引：155

作者：

Culler, TS

Becker, TA

Muller, RA

Renne, PR ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[4] Berkeley Geochronol Ctr, Berkeley, CA 94709 USA

来源：

SCIENCE | 2000年 / 287卷 / 5459期

关键词：

D O I：

10.1126/science.287.5459.1785

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：

Lunar spherules are small glass beads that are formed mainly as a result of small impacts on the lunar surface; the ages of these impacts can be determined by the 40Ar/39Ar isochron technique. Here, 155 spherules separated from 1 gram of Apollo 14 soil were analyzed using this technique. The data show that over the Last similar to 3.5 billion years, the cratering rate decreased by a factor of 2 to 3 to a low about 500 to 600 million years ago, then increased by a factor of 3.7 +/- 1.2 in the last 400 million years. This latter period coincided with rapid biotic evolutionary radiation on Earth.

引用

页码：1785 / 1788

页数：4

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