AN EXTRATERRESTRIAL IMPACT

被引：34

作者：

ALVAREZ, W ^{[1
]}

ASARO, F ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720

来源：

SCIENTIFIC AMERICAN | 1990年 / 263卷 / 04期

关键词：

D O I：

10.1038/scientificamerican1090-78

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：

An extraterrestrial impact, say Alvarez and Asaro. They and other investigators discovered iridium in the clays that mark the sudden disappearance of dinosaurs from the fossil record. Because iridium is rare in the earth's crust but abundant in some meteorites, they concluded that a giant meteorite collided with the earth, hurling megatons of debris into the atmosphere.

引用

页码：78 / 84

页数：7