An experimental study of reproduction of nakhlite martian meteorites

在三年的研究期间，我进行了以下工作。(1)研究了Yamato nakhlites和MIL 03346两种不同的nakhlites，根据质量平衡计算估算了它们的母岩浆组成，并确定了这些熔融体的结晶序列。这一系列的研究在几个国内和国际矿物学和陨石学会会议上发表，并在国际陨石学和行星科学杂志上发表了一篇完整的论文。(2)我将立式气体混合炉设置在1bar。利用该炉，我进行了等温实验，以确定和修正nakhite岩浆的相关系，并在QFM条件下进行了nakhite合成的冷却实验。在我开始实验的两年后，我发现在制备原料的过程中，不锈钢被污染到了玻璃中，我们用玛瑙砂浆代替了不锈钢。因此，我对初步实验结果进行了修改。此时，硅石可能的母岩浆液相温度为1140℃，钛磁铁矿与奥辉石共晶。固相温度~ 980℃。(3)根据质量平衡计算确定的母岩浆组成实验表明，晶晶奥辉岩的组成与岩心奥辉岩的组成基本一致。这有力地表明母岩浆成分是正确的。与经过4.2℃/h冷却实验得到的MIL 03346 nakhlite的织构和成分非常相似。nakholite中围绕斑晶岩心的边缘奥辉岩一般分为两种类型：外缘为富ga辉石的Yamato型和hedenburgtic外缘为MIL型。我合成了以1℃/h慢速冷却形成的Yamato型和以4.2℃/h快速冷却形成的MIL型两种轮辋。我将继续进行实验，直到今年夏天，并将向国际期刊提交一篇完整的论文。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