Journal article Open Access

The age of carbonates in Martian meteorite ALH 84001

Connelly, J. N.; Nyquist, L. E.; Cy, Shih; Wiesmann, H.; Reese, Y.; Borg, L. E.

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 ∼5 percent), whitlockite (trace), and orthopyroxene (∼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.
Files (248.3 kB)
Name Size
article.pdf
md5:dcd1bdf128fa05f38904d72e8201894f
248.3 kB Download
209
147
views
downloads
Views 209
Downloads 147
Data volume 36.5 MB
Unique views 203
Unique downloads 146

Share

Cite as