Persistent or repeated surface habitability on Mars during the late Hesperian - Amazonian
Persistent or repeated surface habitability on Mars during the late Hesperian - Amazonian
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DOI：
10.1002/2017gl072660
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发表时间：
2017-05-16
影响因子：
5.2
通讯作者：
Wilson, Sharon A.
中科院分区：
文献类型：
--
作者：
Kite, Edwin S.;Sneed, Jonathan;Wilson, Sharon A.
火星上的大型冲积扇沉积物记录了相对较新的可居住地表条件（小于或类似于3.5Ga，晚期西方-亚马逊）。我们发现，在冲积扇沉积的总时间间隔上，净沉积速率为2000万年，比以前的下限长10（3）倍。一个更现实的方法，修正了完全埋在扇形沉积物中的陨石坑，将下限提高到>（100-300）百万年。我们的计算中没有包括的几个因素将进一步增加下限。下限排除扇形成的一个短暂的气候异常。因此，在火星上的晚期西方-亚马逊时期，持续或重复的过程允许了可居住的表面条件。
Large alluvial fan deposits on Mars record relatively recent habitable surface conditions (less than or similar to 3.5Ga, Late Hesperian - Amazonian). We find net sedimentation rate 20 Myr on the total time interval spanned by alluvial fan aggradation, >10(3)-fold longer than previous lower limits. A more realistic approach that corrects for craters fully entombed in the fan deposits raises the lower bound to >(100-300) Myr. Several factors not included in our calculations would further increase the lower bound. The lower bound rules out fan formation by a brief climate anomaly. Therefore, during the Late Hesperian - Amazonian on Mars, persistent or repeated processes permitted habitable surface conditions.