Curiosity Sits on Rocks Similar to Ones in Mexico
“Cuatro Ciénegas is extraordinarily similar to Mars. As well as the Gale crater where Curiosity is currently located on its exploration of the red planet, this landscape is the home to gypsum formed by fire beneath the seabed,” as explained to SINC by Valeria Souza, evolutionary ecologist at the National Autonomous University of Mexico (UNAM).
The researcher states that sulphur components from magma and minerals from the sea (carbonates and molecules with magnesium) are required to form gypsum. In the case of the Cuatro Ciénegas Basin, the magma under the seabed was very active. In fact, it allowed for the continent displacement during the Jurassic Period: “Here was where the supercontinent Pangaea opened up some 200 million years ago, pushing the hemisphere north from the equator where it is now.”
In the case of Mars, the scientists have not been able to confirm tectonic movement in its crust at any point, but they believe that a large meteorite crashed into its primitive sea. The fact that probing has detected gypsum in the Gale crater indicates that mineral-rich water was present and that sulphur was able to form due to the impact of the meteorite causing the crater.
It is no easy task to find a place on Earth similar to this martian environment, except in Cuatro Ciénegas. For this reason astrobiologists toil in their work to understand how its bacterial communities work. “This oasis in the middle of the Chihuahua desert is a time machine for organisms that, together as a community, have transformed our blue planet yet have survived all extinctions. How they have managed to do this can be revealed by their genes,” says Souza.
The team have analyzed the ‘metagenomes’, the genome of the different bacterial communities that proliferate in these marshes by adapting parallel strategies to overcome survival challenges in a place with so little nutrients.
Green, Red and Blue Springs
“Understanding the usage and exploitation strategies of phosphorous is necessary in understanding what could happen in extreme scenarios like on other planets where there is a possibly serious limitation to this and other nutrients,” explains Luis David Alcaraz, Mexican researcher participating in the study from the Higher Public Health Research center of Valencia, Spain.
This project has enjoyed the support of Mexico’s Carlos Slim Foundation and the Technological Innovation Research Project Support Program of UNAM. It has also received the support of the National Science Foundation (NSF) of the USA and NASA, which has been studying Cuatro Ciénegas for more than a decade.
The Cuatrociénegas Flora and Fauna Protection Area is a protected area but the scientists and conservation groups are worried that its water is being over exhausted. “The bacterial communities have survived all types of cataclysms here such as the extinction of the dinosaurs or the majority of marine creatures. But, the only thing they are not adapted for is the lack of water,” warns Souza.