期刊
SCIENCE
卷 321, 期 5885, 页码 79-81出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1159317
关键词
-
Morphologies and size- frequency distributions of impact craters on Mercury imaged during MESSENGER's first flyby elucidate the planet's geological history. Plains interior to the Caloris basin displaying color and albedo contrasts have comparable crater densities and therefore similar ages. Smooth plains exterior to Caloris exhibit a crater density similar to 40% less than on interior plains and are thus volcanic and not Caloris impact ejecta. The size distribution of smooth- plains craters matches that of lunar craters postdating the Late Heavy Bombardment, implying that the plains formed no earlier than 3.8 billion years ago ( Ga). At diameters less than or equal to 8 to 10 kilometers, secondary impact craters on Mercury are more abundant than primaries; this transition diameter is much larger than that on the Moon or Mars. A low density of craters on the peak- ring basin Raditladi implies that it may be younger than 1 Ga.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据