Abstract The ALH-77005 Martian meteorite was found in Allan Hills on Antarctica during the Japanese National Institute of Polar Research (1977-1978) mission. One thin section sample was studied by optical microscopy for microtexture and by FTIR-ATR microscopy for interpretation of biogenic minerals and embedded organic materials. The geochemical data (biogenic elements, δ13C) of ALH-77005 meteorite from literature implementing recent results were compared to terrestrial geological samples. The ALH-77005 has poikilitic textures with coarse pyroxenes and brown olivines, and with recrystallized melt pocket. The coarse-grained minerals do not contain any alteration along the grain boundaries. Melt pocket and vicinity of opaque minerals contain biogenic signatures as filamentous, coccoidal forms of iron-oxidizing bacteria. The biosignatures were determined by 1) coccoidal, filamentous forms, 2) presence of embedded organic material, 3) presence of biogenic minerals, like ferrihydrite, goethite, and hematite. The other signatures for biogenicity of this meteorite are strong negative δ13C, enrichment of Fe, Mn, P, Zn in shock melt support scenario. This study proposes presence of microbial mediation on Mars.

中文翻译：

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ALH-77005 Shergottite 中的矿化生物特征——火星生命的线索？

摘要 ALH-77005 火星陨石是在日本极地研究所 (1977-1978) 任务期间在南极洲艾伦山发现的。一个薄片样品通过光学显微镜研究微观纹理，并通过 FTIR-ATR 显微镜研究生物矿物和嵌入的有机材料。ALH-77005 陨石的地球化学数据（生物成因元素，δ13C）来自实施最近结果的文献，与陆地地质样品进行了比较。ALH-77005 具有带粗辉石和棕色橄榄石的 poikilitic 纹理，以及重结晶熔袋。粗粒矿物沿晶界不包含任何蚀变。熔体袋和不透明矿物附近包含生物特征，如丝状、球状形式的铁氧化细菌。生物特征由 1) 球状、丝状形式，2) 嵌入有机材料的存在，3) 生物矿物的存在决定，如水铁矿、针铁矿和赤铁矿。这颗陨石的生物成因的其他特征是强烈的负 δ13C，在冲击熔体支持情景中铁、锰、磷、锌的富集。这项研究提出了火星上存在微生物中介。