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An experimental study of reproduction of nakhlite martian meteorites

钠镁石火星陨石繁殖的实验研究

基本信息

批准号：
15540463
负责人：
IMAE Naoya
金额：
$ 2.11万
依托单位：
National Institute of Polar Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

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

在三年的研究期间，我进行了以下工作。(1)I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这些母岩浆的成分，并确定了这些熔体的结晶序列。这一系列的研究报告在矿物学和陨石学学会的几次国内和国际会议上发表，论文全文已发表在《陨石学和行星科学》国际期刊上。(2)I将立式气体混合炉设置为1巴。利用该炉进行了恒温实验，以确定和修正赤霞岩岩浆的相关系，并在QFM条件下进行了赤霞岩合成的冷却实验。当我开始实验两年后，我发现不锈钢在制备原料的过程中被污染到玻璃中，我们用玛瑙研钵代替不锈钢研钵， ...更多信息碎玻璃的馅饼作为结果，我修改了初步的实验结果。钠闪石母岩浆的液相线温度为1140℃，钛磁铁矿与普通辉石共结晶。固相线温度为980℃。（3）利用我根据质量平衡计算确定的母岩浆成分进行的实验表明，结晶后的辉石的成分与Nakhlites中核部辉石的成分非常一致。这有力地表明母岩浆的成分是正确的。结构和成分与4.2℃/h冷却实验产生的MIL 03346裸石非常相似。围绕斑晶核部辉石的边缘辉石可分为两种类型：外边缘为贫Ga辉石的大和型和外边缘为镁铁辉石的MIL型。我合成了这两种类型：Yamato型轮辋主要以1℃/h的速度缓慢冷却，MIL型轮辋主要以4.2℃/h的速度快速冷却。我将继续进行实验，直到今年夏天，并将向国际期刊提交全文。少