Carbon abundance and silicate mineralogy of anhydrous interplanetary dust particles.
Carbon abundance and silicate mineralogy of anhydrous interplanetary dust particles.
复制标题
无水行星际尘埃颗粒的碳丰度和硅酸盐矿物学。
DOI：
10.1016/0016-7037(93)90012-l
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发表时间：
1993
影响因子：
5
通讯作者：
David S. McKay
中科院分区：
文献类型：
--
作者：
K. Thomas;G. Blanford;L. Keller;Wolfgang Klöck;David S. McKay
我们用分析电子显微镜研究了19个无水行星间尘埃颗粒。我们已经确定了一种小颗粒的定量轻元素EDX分析方法，并已将这些技术应用于一组IDP。我们的研究结果表明，一些IDP有显着较高的散装碳丰度比碳质方解石。我们还确定了碳丰度和硅酸盐矿物学之间的关系，在我们的一套无水IDP。一般来说，这些颗粒主要是辉石，橄榄石，或橄榄石和辉石的近相等的混合物。辉石占主导地位的IDPs有较高的碳丰度比那些占主导地位的橄榄石。混合矿物学IDP的成员可以根据其碳丰度与辉石或橄榄石为主的颗粒进行分组。高碳，辉石为主的颗粒具有原始的矿物学和散装组成，显示出强烈的相似性彗星尘埃颗粒。我们认为，低碳，橄榄石为主的IDPs可能来自小行星。根据碳丰度，混合矿物组代表来自彗星或小行星的颗粒。我们认为，高碳，富含辉石的无水IDPs是彗星尘埃的最佳候选人。
We have studied nineteen anhydrous chondritic interplanetary dust particles (IDPs) using analytical electron microscopy. We have determined a method for quantitative light element EDX analysis of small particles and have applied these techniques to a group of IDPs. Our results show that some IDPs have significantly higher bulk carbon abundances than do carbonaceous chondrites. We have also identified a relationship between carbon abundance and silicate mineralogy in our set of anhydrous IDPs. In general, these particles are dominated by pyroxene, olivine, or a subequal mixture of olivine and pyroxene. The pyroxene-dominated IDPs have a higher carbon abundance than those dominated by olivines. Members of the mixed mineralogy IDPs can be grouped with either the pyroxene- or olivine-dominated particles based on their carbon abundance. The high carbon, pyroxene-dominated particles have primitive mineralogies and bulk compositions which show strong similarities to cometary dust particles. We believe that the lower carbon, olivine-dominated IDPs are probably derived from asteroids. Based on carbon abundances, the mixed-mineralogy group represents particles derived from either comets or asteroids. We believe that the high carbon, pyroxene-rich anhydrous IDPs are the best candidates for cometary dust.