The age of the carbonates in martian meteorite ALH84001.

  title={The age of the carbonates in martian meteorite ALH84001.},
  author={Lars E. Borg and James N Connelly and Laurence E. Nyquist and Charles Y Shih and H. Wiesmann and Yvette Reese},
  volume={286 5437},
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 approximately 5 percent), whitlockite (trace), and orthopyroxene (approximately 95 percent). The carbonate formation age is contemporaneous with a period in… CONTINUE READING