An experimental study of reproduction of nakhlite martian meteorites

在三年的研究时间里，主要做了以下几方面的工作：(1)对Yamato nakhlitts和MIL 03346两种不同的钠长岩进行了研究，根据物质平衡计算估算了它们的母岩浆成分，确定了它们的结晶序列。这一系列的研究已在多个国内外矿物学和气象学会会议上发表，并在一份国际陨石和行星科学杂志上发表了完整的论文。(2)我在1巴的立式气体混合炉上进行了设置。利用该炉进行了等温实验，以确定和修正钠长石岩浆的相关系，并在QFM条件下进行了合成钠长石的冷却实验。当我开始实验两年后，我发现在准备原料的过程中，不锈钢被污染到玻璃中，我们用玛瑙砂浆代替了不锈钢…更多用于玻璃破碎的奥塔尔。作为结果，我对初步实验结果进行了修改。可能为钠长石母的岩浆液相线温度为1140℃，钛磁铁矿和辉石共结晶。固相线温度为~980℃。(3)根据质量平衡计算确定的母岩浆成分实验表明，结晶辉石的成分与钠辉石中的核辉石成分非常一致。这有力地表明母岩浆成分是正确的。与4.2℃/h冷却实验得到的MIL-03346钠辉石的结构和成分非常相似，其斑晶核辉绿岩周围的边缘辉石一般分为两种类型：贫镓辉石外缘的Yamto型和辉辉岩外缘的MIL型。我综合了这两种类型：以1℃/h为主要速度的缓慢冷却形成的Yamato型轮缘和以4.2℃/h为主要速度的快速冷却形成的MIL型轮缘。我将继续进行实验，直到今年夏天，并将向一家国际期刊提交一篇完整的论文。较少

During the research period for three years, I carried out the followings.(1)I studied two different nakhlites of the Yamato nakhlites and MIL 03346, estimated these parent magma compositions based on the mass balance calculation, and determined the crystallization sequences for these melts. These series of studies were presented by several domestic and international meetings of mineralogical and meteoritical societies, and a full paper has been published in an international journal of Meteoritics and Planetary Science.(2)I set up the vertical gas-mixing furnace at 1 bar. Using this furnace, I have been carrying out isothermal experiments in order to determine and revise the phase relationship for nakhlite magmas and cooling experiments for the synthesis of nakhlites under the QFM condition. When two years passed since I started experiments, I found that the stainless was contaminated into glass during the preparation of the starting material, we used agate mortar instead of stainless m … More ortar for the glass crushing. As results, I modified the preliminary experimental results. Then the liquidus temperatue of a possible parent magma for nakhlites is 1140℃, and titanomagnetites and augites co-crystallize. The solidus temperature is 〜980℃.(3)Experiments using the parent magma composition, which I determined based on the mass balance calculation, showed that compositions of crystallized augites are closely identical with those in core augites in nakhlites. This strongly suggests that the parent magma composition is correct. Closely similar texture and composition to the MIL 03346 nakhlite produced from a cooling experiment of 4.2℃/h. Rim augites surrounding phenocrystic core augites in nakhlites are generally divided into two types : the Yamato type with Ga-poor pyroxene outer rim and the MIL type of hedenburgitic outer rim. I synthesized these two types : rims of Yamato type formed from slow cooling runs mainly at 1℃/h and those of MIL type from rapid cooling runs mainly at 4.2℃/h.I will continue to carry out experiments till this summer, and will submit a full paper to an international journal. Less