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首页> 外文期刊>Planetary and space science >Recent high-latitude resurfacing by a climate-related latitude-dependent mantle: Constraining age of emplacement from counts of small craters
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Recent high-latitude resurfacing by a climate-related latitude-dependent mantle: Constraining age of emplacement from counts of small craters

机译：与气候有关的纬度依赖地幔的最新高纬表面改建：从小火山口的数量限制了进驻年龄

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摘要

A surficial mantling deposit composed of ice and dust blankets Mars at high and mid-latitudes. The emplacement and evolution of this deposit is thought to be driven by astronomical forcings akin to, but more extreme than, those responsible for Earth's ice ages. In order to test predictions about the age of this deposit, more than 60,000 superposed craters were counted on terrain near the rims of 16 young craters using sub-meter resolution images. A chronology for the deposition of the latitude-dependent mantle is revealed by these data and shows that: (1) the overall age and age trend of mantling deposits is consistent with first-order control by obliquity variations; (2) mantling processes are substantially younger than some equatorial rayed craters which have crater retention ages of -20-30 million years; (3) the mantle is younger by a factor of two to three at polar latitudes compared to its furthest equatorial extent (~30°). Additionally, these crater counts confirm the suitability of small craters in geological analyses of youthful planetary surfaces and provide new data on the density of meters-scale craters superposed on deposits of geologically-recent craters.
机译：在高纬度和中纬度地区，由冰和尘埃组成的表层沉积物覆盖了火星。人们认为该沉积物的沉积和演化是由天文强迫推动的，而这种强迫类似于但比那些造成地球冰河时期的强迫更大。为了测试有关该矿床年龄的预测，使用亚米分辨率图像在16个年轻陨石坑边缘附近的地​​形上计数了超过60,000个重叠的陨石坑。这些数据揭示了与纬度有关的地幔沉积的年代学，结果表明：（1）沉积物的总体年龄和年龄趋势与通过倾角变化进行的一阶控制相一致； （2）处理过程比某些赤道射线陨石坑年轻得多，后者的陨石坑保留年龄为-20-30百万年； （3）与最远的赤道范围（〜30°）相比，地幔在极地纬度处要年轻两到三倍。此外，这些陨石坑的数量证实了小型陨石坑在年轻行星表面地质分析中的适用性，并提供了叠加在最近地质坑道上的米级陨石坑密度的新数据。

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