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首页> 外文期刊>International Journal of Astrobiology >Magmatac carbon in Martian meteorites: attempts to constrain the carbon cycle on Mars
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Magmatac carbon in Martian meteorites: attempts to constrain the carbon cycle on Mars

机译：火星陨石中的岩浆碳：试图限制火星上的碳循环

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摘要

One of the current goals of Martian exploration is to find evidence for extinct (or even extant) life. Carbon (an essential ingredient of life on Earth) is known to occur on Mars as CO2 in the atmosphere and frozen in the polar caps; it is inferred to be present as carbonates in the Martian crust and soils. We are attempting to define and quantify the different carbon reservoirs on Mars, so that we can follow Mars' carbon cycle. This paper discusses a primordial magmatic component that could be the starting point of such a cycle. The nature, distribution and isotopic composition of carbon was measured in a suite of Martian meteorites, comprising Chassigny and 11 shergottites. Other Martian meteorites were not included, as they sample rocks that have been altered by fluids at Mars' surface. Our results, obtained by high-resolution stepped combustion and mass spectrometry, show that the magmatic component has a very variable abundance of 1-100 ppm, with 613C - 20 + 4%o. This value is close to magmatic carbon determined for Moon and for Vesta (the parent body of the HED basaltic meteorites), but very different from that of Earth.
机译：火星人探索的当前目标之一是寻找灭绝（甚至现存）生命的证据。碳（地球上生命的基本成分）在火星中以二氧化碳的形式存在于大气中，并在极地盖帽中冻结。据推测，它以碳酸盐的形式存在于火星的地壳和土壤中。我们正在尝试定义和量化火星上不同的碳库，以便我们能够追踪火星的碳循环。本文讨论了原始的岩浆成分，它可能是这种循环的起点。碳的性质，分布和同位素组成在一组火星陨石中进行了测量，其中包括Chassigny和11个黑云母。其他火星陨石并未包括在内，因为它们会采样被火星表面的流体所改变的岩石。通过高分辨率分步燃烧和质谱获得的结果表明，岩浆成分的丰度变化非常大，为1-100 ppm，即613C-20 + 4％o。该值接近于为月球和维斯塔（HED玄武岩陨石的母体）确定的岩浆碳，但与地球有很大不同。

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