Back to Search
Start Over
A younger age for ALH84001 and its geochemical link to shergottite sources in Mars
- Source :
- Science. April 16, 2010, Vol. 328 Issue 5976, p347, 5 p.
- Publication Year :
- 2010
-
Abstract
- Martian meteorite ALH84001 (ALH) is the oldest known igneous rock from Mars and has been used to constrain its early history. Lutetium-hafnium (Lu-Hf) isotope data for ALH indicate an igneous age of 4.091 [+ or -] 0.030 billion years, nearly coeval with an interval of heavy bombardment and cessation of the martian core dynamo and magnetic field. The calculated Lu/Hf and 5m/Nd (samarium/neodymium) ratios of the ALH parental magma source indicate that it must have undergone extensive igneous processing associated with the crystallization of a deep magma ocean. This same mantle source region also produced the shergottite magmas (dated 150 to 570 million years ago), possibly indicating uniform igneous processes in Mars for nearly 4 billion years. 10.1126/science.1185395
Details
- Language :
- English
- ISSN :
- 00368075
- Volume :
- 328
- Issue :
- 5976
- Database :
- Gale General OneFile
- Journal :
- Science
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.225502961
- Full Text :
- https://doi.org/10.1126/science.1185395