2013年6月3日星期一

The greatest place to be a Martian: Australia?

The greatest place to be a Martian: Australia?

May 31, 2013 — Would Martians feel at home in Australia? Recent research has proven that if Martians took a holiday to Australia they might feel more at home than you'd think. Associate Professor Patrice F. Rey (University of Sydney) has recently exposed a unique set of attributes suggesting that the Australian red centre could be a close analogue for the surface of the red planet -- and how this unusual weathering has led to the formation of Australia's opals.






Precious opal, Australia's national gemstone, has been mined from the red dirt of central Australia for over a century. Its formation at shallow depths, and why it can be found in central Australia -- yet hardly anywhere else on Earth -- has remained a mystery. In this recent paper published in the Australian Journal of Earth Sciences, Associate Professor Patrice Rey, from the University's School of Geosciences, explains that the formation of Australian opal was due to an extraordinary episode of acidic weathering during the drying out of the central Australian landscape that followed the regression of the Eromanga Sea 100 years ago.

On Earth, regional acidic weathering is rare. Interestingly, acidic oxidative weathering has been documented at the surface of Mars, which shares an intriguing set of attributes with the Great Artesian Basin. These attributes include similar sandstones, a long episode of drying out leading to the formation of clay and opaline silica, and last but not least the same surface colour. This latest research suggests that the Australian red centre could well be the best regional terrestrial analogue for the surface of the red planet. Could it be that Australia may be home to Martians in the not too distant future?



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