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arXiv 0910.1399astro-ph.EP
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通过对水手10号数据应用模型生产函数修正水星的地质年代学:地质意义

Mercury's geochronology revised by applying Model Production Functions to Mariner 10 data: geological implications

M. Massironi, G. Cremonese, S. Marchi, M. Martellato, M. Mottola, R. J. Wagner

摘要:

模型生产函数年表使用主带小行星和近地天体的动力学模型来推导撞击目标体的通量。这被转换成特定行星表面的陨石坑大小频率分布,并使用月球表面不同区域的辐射年龄进行校准。这一新方法已被应用于水手10号拍摄的水星高地和几个大型撞击盆地图像上的陨石坑计数。对平原地区的MPF估计显示,与以前的年表相比,这些地区的年龄更小。假设一个变量的最上层的Hermean地壳,年龄的Caloris内部平原可能是年轻的3.59 Ga,在协议与信使的结果,这意味着长期的火山活动克服收缩构造。MPF年表还表明,随着时间的推移,抛射物的流量是可变的,与古代时期的MBA一致,然后逐渐与近地天体相当。

英文摘要:

Model Production Function chronology uses dynamic models of the Main Belt Asteroids (MBAs) and Near Earth Objects (NEOs) to derive the impactor flux to a target body. This is converted into the crater size-frequency-distribution for a specific planetary surface, and calibrated using the radiometric ages of different regions of the Moon's surface. This new approach has been applied to the crater counts on Mariner 10 images of the highlands and of several large impact basins on Mercury. MPF estimates for the plains show younger ages than those of previous chronologies. Assuming a variable uppermost layering of the Hermean crust, the age of the Caloris interior plains may be as young as 3.59 Ga, in agreement with MESSENGER results that imply that long-term volcanism overcame contractional tectonics. The MPF chronology also suggests a variable projectile flux through time, coherent with the MBAs for ancient periods and then gradually comparable also to the NEOs.

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