Searching for the source regions of martian meteorites using MGS TES: Integrating martian meteorites into the global distribution of igneous materials on Mars
Searching for the source regions of martian meteorites using MGS TES: Integrating martian meteorites into the global distribution of igneous materials on Mars
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DOI：
10.1111/j.1945-5100.2003.tb00284.x
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发表时间：
2003-06-01
影响因子：
2.2
通讯作者：
Bandfield, JL
中科院分区：
文献类型：
--
作者：
Hamilton, VE;Christensen, PR;Bandfield, JL
本研究的目的是利用火星全球勘测者热发射光谱仪 (MGS TES) 的数据来识别和绘制所有 5 种已知火星陨石岩性（玄武岩、二辉橄榄岩、单斜辉石、斜方辉石和纯辉石）的可能来源区域。我们使用 6 颗火星陨石（Los Angeles、Zagami、ALH A77005、Nakhla、ALH 84001 和 Chassiny）的实验室光谱作为最终成员，以及之前从 TES 数据得出的大气和表面光谱，对 TES 数据集进行去卷积。每个陨石末端成员分布的全球地图（16 像素/度）显示，在地球上大部分无尘区域，类似陨石的成分不存在于或高于 TES 可探测极限。然而，我们已经自信地在尼利窝、恒河峡谷及其附近、阿尔及尔和希腊盆地边缘以及埃欧斯峡谷中确定了与 ALH A77005、Chassiny 和 ALH 84001 类似的局部规模（100 秒至 1000 公里（2））浓度的含橄榄石和斜方辉石材料。在整个 Valles Marineris 地区和 Syrtis Major 部分地区发现了接近检测限的类似 Nakhla 的物质。在本研究规模的任何空间相干区域中均未检测到玄武岩半角岩。火星陨石状岩性仅代表无尘表面的一小部分，因此不能代表古代地壳的大部分成分。在更多空间受限区域中，在 TES 美味极限之上识别出类似陨石的光谱特征（
The objective of this study was to identify and map possible source regions for all 5 known martian meteorite lithologies (basalt, lherzolite, clinopyroxenite, orthopyroxenite, and dunite) using data from the Mars Global Surveyor Thermal Emission Spectrometer (MGS TES). We deconvolved the TES data set using laboratory spectra of 6 martian meteorites (Los Angeles, Zagami, ALH A77005, Nakhla, ALH 84001, and Chassigny) as end members, along with atmospheric and surface spectra previously derived from TES data. Global maps (16 pixels/degree) of the distribution of each meteorite end member show that meteorite-like compositions are not present at or above TES detectability limits over most of the planet's dust-free regions. However, we have confidently identified local-scale (100s-1000s km(2)) concentrations of olivine- and orthopyroxene-bearing materials similar to ALH A77005, Chassigny, and ALH 84001 in Nili Fossae, in and near Ganges Chasma, in the Argyre and Hellas basin rims, and in Eos Chasma. Nakhla-like materials are identified near the detection limit throughout the eastern Valles Marineris region and portions of Syrtis Major. Basaltic shergottites were not detected in any spatially coherent areas at the scale of this study. Martian meteorite-like lithologies represent only a minor portion of the dust-free surface and, thus, are not representative of the bulk composition of the ancient crust. Meteorite-like spectral signatures identified above TES delectability limits in more spatially restricted areas (