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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Surface-compositional properties of the Malea Planum region of the Circum-Hellas Volcanic Province, Mars
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Surface-compositional properties of the Malea Planum region of the Circum-Hellas Volcanic Province, Mars

机译：火星Circum-Hellas火山省马雷纳平原的表面组成特征

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We used Thermal Emission Spectrometer (TES), Thermal Emission Imaging System (THEMIS), High-Resolution Stereo Camera (HRSC), and Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA) data to assess the physical and compositional properties of the Malea Planum portion of the Circum-Hellas Volcanic Province (CHVP). Our analysis of surface materials shows that the thermal inertia decreases from north to south, and that there is greater dust cover on the flanks of the CHVP volcanoes than in their putative calderas. Local variations in thermal inertia in Malea Planum are likely due to variations in surface material caused by aeolian and periglacial/permafrost processes, whereas regional variations are likely due to seasonal deposition and sublimation of ice at higher latitudes. Spectral analysis of OMEGA data indicates the widespread presence of pyroxenes and/or olivine, particularly in the rims of craters that likely excavated volcanic materials. Dark materials occur throughout the CHVP, but are concentrated in topographic lows such as crater and caldera floors. Derivation of modal mineralogies from OMEGA data show a variation in composition of dark materials across Malea Planum: eastern dark deposits have higher olivine and low-calcium pyroxene contents, lower high-calcium pyroxene contents, and higher ratios of low-calcium to total pyroxene, relative to western dark deposits. Correlation with cratering-model age estimates suggests that the western deposits are associated with older features (3.8. Ga) than the eastern deposits (3.6. Ga), but these age differences are within uncertainties. Nevertheless, these results suggest a potential change in composition of volcanic materials in the Malea Planum portion of the CHVP with space, and possibly time.
机译：我们使用了热发射光谱仪（TES），热发射成像系统（THEMIS），高分辨率立体相机（HRSC）以及矿物观测站，欧莱雅（Le'Eau），莱斯格拉塞斯（l Glaces et l'Activité）（OMEGA）数据来评估物理切尔-赫拉斯火山省（CHVP）的马莱纳平原部分的组成和组成特性。我们对地表物质的分析表明，热惯性从北向南降低，并且CHVP火山的侧翼比推定的火山口具有更大的尘埃覆盖。 Malea Planum热惯性的局部变化很可能是由于风沙和冰缘/多年冻土过程引起的地表材料变化，而区域变化很可能是由于较高纬度地区的冰的季节性沉积和升华引起的。 OMEGA数据的光谱分析表明，辉石和/或橄榄石广泛存在，特别是在可能挖出火山物质的火山口边缘。 CHVP各处都出现深色物质，但集中在地形低点，如火山口和火山口地板。根据OMEGA数据得出的模态矿物学数据表明，马累平原的暗物质组成有所变化：东部暗矿床的橄榄石和低钙辉石含量较高，高钙辉石含量较低，低钙与总辉石的比例较高，相对于西方的黑暗矿床。与火山口模型年龄估计值的相关性表明，西部矿床比东部矿床（3.6 Ga）具有更老的特征（3.8 Ga），但这些年龄差异在不确定性之内。但是，这些结果表明，CHVP的马莱纳平原的火山物质组成可能随时间和空间而变化。

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