The age of the carbonates in martian meteorite ALH84001

被引：135

作者：

Borg, LE

Connelly, JN

Nyquist, LE

Shih, CY

Wiesmann, H

Reese, Y

机构：

[1] NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA

[2] Univ Texas, Dept Geol Sci, Austin, TX 78713 USA

[3] Lockheed Engn & Sci Co, Houston, TX 77258 USA

来源：

SCIENCE | 1999年 / 286卷 / 5437期

关键词：

D O I：

10.1126/science.286.5437.90

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 age of secondary carbonate mineralization in the martian meteorite ALH84001 was determined to be 3.90 +/- 0.04 billion years by rubidium-strontium (Rb-Sr) dating and 4.04 +/- 0.10 billion years by Lead-Lead (Pb-Pb) dating. The Rb-Sr and Pb-Pb isochrons are defined by Leachates of a mixture of high-graded carbonate (visually estimated as similar to 5 percent). whitlockite (trace), and orthopyroxene (similar to 95 percent). The carbonate formation age is contemporaneous with a period in martian history when the surface is thought to have had flowing water, but also was undergoing heavy bombardment by meteorites. Therefore, this age does not distinguish between aqueous and impact origins for the carbonates.

引用

页码：90 / 94

页数：5

共 32 条

[1] THE GEOCHEMISTRY OF MARINE-SEDIMENTS, ISLAND-ARC MAGMA GENESIS, AND CRUST MANTLE RECYCLING [J].