The Age of the Carbonates in Martian Meteorite ALH84001

Borg, Lars E.; Connelly, James N.; Nyquist, Larry E.; Shih, Chi-Y.; Wiesmann, Henry; Reese, Young

doi:10.1126/science.286.5437.90

Cited by 190Planetary Science and ExplorationAstro and Planetary ScienceGeological and Geochemical Analysis

The Age of the Carbonates in Martian Meteorite ALH84001

Borg, Lars E., Connelly, James N., Nyquist, Larry E., Shih, Chi-Y., Wiesmann, Henry, Reese, Young·1999·Science

DOI 10.1126/science.286.5437.90

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Abstract

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.

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Authors: Borg, L. E., Connelly, J. N., Nyquist, L. E., Shih, C.-Y., Wiesmann, H., & Reese, Y.
Affiliations: Johnson Space Center (US)
The University of Texas at Austin (US)
Lockheed (United States) (US)
Corresponding author: Borg, Lars E.
ORCID: Borg, Lars E.
Connelly, James N.
Venue: Science
Publisher: American Association for the Advancement of Science (AAAS)
Published: 1999-10
Volume: 286
Issue: 5437
Pages: 90-94
ISSN: 0036-8075 (ISSN-L)
1095-9203
DOI: 10.1126/science.286.5437.90
OpenAlex: W2028424955
Cited by: 190
References: 24
Citations by year: 2026: 3 · 2025: 10 · 2024: 6 · 2023: 6 · 2022: 13 · 2021: 8 · 2020: 8 · 2019: 2 · 2018: 6 · 2017: 7 · 2016: 4 · 2015: 6 · 2014: 7 · 2013: 4 · 2012: 6
FWCI: 9.84
Type: journal article
Language: en
Open access: closed
Locations: Science (publishedVersion)
PubMed (publishedVersion)
Topics: Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords: ALH84001, Martian meteorites, carbonate formation, Rb-Sr geochronology, isochrons, orthopyroxene, whitlockite, aqueous alteration, heavy bombardment
MeSH terms: Calcium, Calcium Phosphates, Carbonates, Iron, Isotopes, Lead, Magnesium, Minerals, Rubidium Radioisotopes, Strontium Isotopes, Mars, Meteoroids

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The Age of the Carbonates in Martian Meteorite ALH84001

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