After extensive analyses by a team of scientists led by Carl Agee at the University of New Mexico, researchers have identified a new class of Martian meteorite that likely originated from the Mars's crust. It is also the only meteoritic sample dated to 2.1 billion years ago, the early era of the most recent geologic epoch on Mars, an epoch called the Amazonian. The meteorite was found to contain an order of magnitude more water than any other Martian meteorite. Researchers from the Carnegie Institution (Andrew Steele, Marilyn Fogel, Roxane Bowden, and Mihaela Glamoclija) studied carbon in the meteorite and have shown that organic carbon (macromolecular) similar to that seen in other Martian meteorites is also found in this meteorite. The research is published in the January 3, 2013, issue of Science Express.
The unique meteorite, dubbed Northwest Africa (NWA) 7034, has some similarities to, but is very different from other Martian meteorites known as SNC (for three members of the group: Shergotty, Nakhla, and Chassign). SNC meteorites currently number 110. And so far they are the only meteoritic samples from Mars that scientists have been able to study. However, their point of origin on the Red Planet is not known. In fact, recent data from lander and orbiter missions suggest that they are a mismatch for the Martian crust.
As co-author Andrew Steele, who led the carbon analysis at the Carnegie Institution's Geophysical Laboratory explained: "The texture of the NWA meteorite is not like any of the SNC meteorites. It is made of cemented fragments of basalt, rock that forms from rapidly cooled lava, dominated with feldspar and pyroxene, most likely from volcanic activity. This composition is common for lunar samples, but not from other Martian meteorites. This unusual meteorite's chemistry suggests it came from the Martian crust. It is first link thus far of any meteorite to the crust. Our carbon analysis also showed that the meteorite likely underwent secondary processing at the Martian surface, explaining the macromolecular organic carbon. "
Lead author Agee, of the Institute of Meteoritics at the University of New Mexico, remarked: "The basaltic rock in this meteorite is consistent with the crust or upper mantle of Mars based on findings from recent Martian rovers and orbiters. Our analysis of the oxygen isotopes shows that NWA 7034 is not like any other meteorites or planetary samples. The chemistry is consistent with a surface origin and an interaction with the Martian atmosphere. The abundance of water, some 6000 parts per million, suggests that the meteorite interacted with the Martian surface some 2.1 billion years ago."
"Perhaps most exciting, is that the high water content could mean there was an interaction of the rocks with surface water either from volcanic magma, or from fluids from impacting comets during that time," said Steele. "It is the richest Martian meteorite geochemically and further analyses are bound to unleash more surprises."
Carnegie Institution: http://www.ciw.edu
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
It's just a bit shorter than Mt. Everest
As the spacecraft completes its final flyby of Saturn's moon Dione, TIME reflects on the most spectacular images from the mission thus far
Satellites that are manufactured and assembled in orbit could let you launch your own armchair science project or just experience the effect of seeing Earth from above
Two of the four NASA space shuttles on display in US museums have had their water tanks removed for possible use in a storage system for the ISS
After three botched missions to resupply the International Space Center since October, an unmanned cargo ship blasted off from southern Japan on Wednesday with food, water and gear needed to keep the research station and its crew functioning.
The close encounter may be scientists' last chance to identify ice volcanoes and learn about the moon's inner structure
Astronaut Scott Kelly, spending a year in space, hopes NASA will get "support we need" to develop commercial U.S. crew ships
Comet 67P/ Churyumov-Gerasimenko, shadowed by the Rosetta spacecraft, will make its closest approach to the sun at 3.03 am BST on Thursday morning
Instead of seeking living aliens, ET hunters suggest looking for alien civilisations that have wiped themselves out through technology
This year's event should benefit from the presence of a new moon, which offers the ideal dark conditions for viewing the show