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Smectite deposits in Marathon Valley, Endeavour Crater, Mars, identified using CRISM hyperspectral reflectance data

机译:使用CRISM高光谱反射率数据识别火星Endeavor Crater马拉松山谷中的绿土矿床

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摘要

The similar to 100m wide Marathon Valley crosscuts the Cape Tribulation rim segment of the 22 km diameter, Noachian-age Endeavour impact crater on Mars. Single-scattering albedo spectra retrieved from three Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) Full-Resolution Targeted (FRT, regularized to 18 m/pixel) and two Along Track Oversampled (ATO, regularized to 12 m/pixel) observations indicate the presence of Fe3+-Mg2+ smectite exposures located in Marathon Valley with combination vibration metal-OH absorption strength comparable to smectite spectral signatures in Mawrth Vallis. The Opportunity rover was directed to the exposures and documented the presence of Shoemaker formation impact breccias that have been isochemically altered, likely by fracture-controlled aqueous fluids.
机译:约有100m宽的马拉松山谷横切了22公里直径的苦难角边缘部分,诺亚时代的奋进号撞击火星上的火山口。从三台火星小型侦察成像光谱仪(CRISM)的全分辨率目标(FRT,正则化为18 m /像素)和两个沿轨道超采样(ATO,正则化为12 m /像素)观测中获得的单散射反照率光谱表明存在马拉松河谷中Fe3 + -Mg2 +蒙脱石的暴露,其组合的振动金属-OH吸收强度可与Mawrth Vallis的蒙脱石光谱特征相媲美。机会流动站是针对这些暴露的,并记录了鞋匠地层冲击角砾岩的存在,这些角砾岩已被化学方法改变​​了,很可能是由裂缝控制的含水流体造成的。

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