Abstract
To accurately determine the chronological framework of climatic variations recorded by various Martian terrains,the absolute ages of Martian events and cratering rate need to be constrained by either in situ dating or returned samples.In situ K-Ar dating is currently a more plausible dating technique as compared with sample return.Jarosite(KFe3[SO4]2[OH]6)is the only confirmed K sulfate mineral that is widely present on Mars,as indicated by in situ detection,orbital remote sensing,and meteorite studies.Jarosite can be used for precise K-Ar and 40Ar/39Ar dating.The preservation of jarosite on Mars provides information about the nature and duration of aqueous processes on the Martian surface.Different ages of Martian jarosite represent the key to constraining the transition from Martian surface water activity to arid climatic conditions.This paper summarizes recent advances in our knowledge of the spatial distribution of Martian jarosite,its mineralogical properties and stability on Mars,the Ar diffusion kinetics of jarosite,and the current status of in situ K-Ar dating.Moreover,we examine the key scientific issues to be addressed for in situ K-Ar dating of jarosite and Martian sample return missions,and discuss future research directions.
基金项目
国家自然科学基金(42241161)
国家自然科学基金(41873063)
中国地调局地质调查项目(DD20221644)
中国博士后科学基金(2021M703196)
Graduate Innovation Fund Project of China University of Geosciences,Beijing(2021)(YB2021YC021)
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