An Archean impact layer from the Pilbara and Kaapvaal cratons

被引：101

作者：

Byerly, GR ^{[1
]}

Lowe, DR

Wooden, JL

Xie, XG

机构：

[1] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA

[2] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA

[3] Stanford Univ, US Geol Survey SUMAC, Stanford, CA 94305 USA

来源：

SCIENCE | 2002年 / 297卷 / 5585期

关键词：

D O I：

10.1126/science.1073934

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 Barberton greenstone belt of South Africa and the eastern Pilbara block of Western Australia provide information about Earth's surface environments between 3.2 and 3.5 billion years ago, including evidence for four large bolide impacts that likely created large craters, deformed the target rocks, and altered the environment. We have obtained identical single-zircon uranium-lead ages of 3470 +/- 2 million years ago for the oldest impact events from each craton. These deposits represent a single global fallout layer that is associated with sedimentation by an impact-generated tsunami and in Western Australia is represented by a major erosional unconformity.

引用

页码：1325 / 1327

页数：3

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