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首页> 外文会议>Instruments, methods, and missions for astrobiology XVII >Chemical and Structural Composition of Organic Carbonaceous Structures in Tissint: Evidence for a Biogenetic Origin
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Chemical and Structural Composition of Organic Carbonaceous Structures in Tissint: Evidence for a Biogenetic Origin

机译：Tissint中有机碳质结构的化学和结构组成：生物成因的证据

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Earlier studies of the Tissint Martian meteorite identified the presence of a number of 5-50μm carbonaceous spherical structures. SEM and EDS elemental spectra for 11 selected structures confirmed that they comprise of a carbonaceous outer coating with a inner core of FeS_2 (pyrite) and are characterised as immiscible globules with curved boundaries. Here we report on the results of Raman spectroscopic studies that unambiguously confirm the mantle as comprising of 'disordered carbonaceous material'. R1 = I_D/I_G against Γ_D (cm~(-1)) band parameter plots of the carbonaceous coatings imply a complex precursor carbon inventory comparable to the precursor carbon component of materials of known biotic source (plants, algae, fungi, crustaceans, prokaryotes). Correlation between peak metamorphic temperatures and Raman D-band (Γ_D) parameters further indicate the carbonaceous component was subjected to a peak temperature of ～250 ℃ suggesting a possible link with the hydrothermal precipitation processes responsible for the formation of similar globules observed in hydrothermal calcite veins in central Ireland. Ω _G (cm~(-1)), Γ_G (cm~(-1)), Ω _D (cm~(-1)) and Γ_D(cm~(-1)) parameters further imply a level of crystallinity and disorder of the carbon component consistent with carbonaceous material recovered from a variety of non-terrestrial sources. Cl, N, O and S to C elemental ratios are typical of high volatility bituminous coals and distinctly higher than equivalent graphite standards.
机译：Tissint火星陨石的早期研究发现存在许多5-50μm的碳质球形结构。 11个选定结构的SEM和EDS元素光谱证实，它们由具有FeS_2（黄铁矿）内芯的碳质外涂层组成，并被表征为具有弯曲边界的不混溶小球。在这里，我们报告有关拉曼光谱研究的结果，这些结果明确地确认了地幔是由“无序碳质物质”组成的。 R1 = I_D / I_G相对于碳质涂层的Γ_D（cm〜（-1））带参数图，意味着复杂的前驱体碳库存可与已知生物源材料（植物，藻类，真菌，甲壳类动物，原核生物）的前驱体碳组分相比）。峰值变质温度与拉曼D带（Γ_D）参数之间的相关性进一步表明，碳质组分处于〜250℃的峰值温度，这表明可能与负责在热液方解石脉中观察到的类似小球形成的水热沉淀过程有关。在爱尔兰中部。 Ω_G（cm〜（-1）），Γ_G（cm〜（-1）），Ω_D（cm〜（-1））和Γ_D（cm〜（-1））参数进一步暗示了结晶度和无序度与从各种非陆地来源回收的含碳物质相一致的碳成分的百分比。 Cl，N，O和S对C的元素比是高挥发分烟煤的典型特征，并且明显高于等效的石墨标准。

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