Research press release


Nature Geoscience

Planetary science: How mud might flow on Mars

火星表面の低圧低温下における泥流の振る舞いは、地球の溶岩流に類似している可能性があることを報告する論文が、今週、Nature Geoscience に掲載される。


Petr Brožたちは今回、火星表面条件下の低温表面における泥の伝播を調べるために実験を行った。著者たちは、オープン・ユニバーシティ火星実験室内の傾斜した箱に泥を注ぎ、その泥の伝播を複数のカメラで記録した。その結果、泥流は、典型的な地球の泥流のように流れるのではなく、ドロドロとして荒々しい地球の溶岩のような流れであり、流れていくローブ状の泥の周りに固化した殻が急速に形成されることが分かった。


The behaviour of mud flows under the low pressures and low temperatures of the Martian surface may be similar to lava flows on Earth, according to a study published online in Nature Geoscience.

Thousands of volcano-like landforms associated with lava-like flows dot the surface of Mars. Some have been attributed to magmatic volcanism. These landforms occur in terrains covered by sediments thought to have been deposited by ancient floods, and the rapid burial of wet sediments could have resulted in sedimentary volcanism. However, little is known about how mud would flow on Mars.

Petr Brož and colleagues carried out experiments to investigate the propagation of mud over a cold surface under Martian surface conditions. The authors poured mud into a tilted tray in the Open University Mars Chamber and multiple cameras recorded the resulting mud propagation. They observed that the mud flows did not behave like typical Earth mud flows, but instead resembled ropy and jagged terrestrial lava flows with a frozen crust rapidly forming around lobes of mud.

The findings suggest that flows on Mars and other frigid bodies — such as the dwarf planet Ceres — might be the product of mud volcanism, rather than evidence of magmatic activity.

doi: 10.1038/s41561-020-0577-2


メールマガジンリストの「Nature 関連誌今週のハイライト」にチェックをいれていただきますと、毎週各ジャーナルからの最新の「注目のハイライト」をまとめて皆様にお届けいたします。