Density, magnetic susceptibility, and the characterization of ordinary chondrite falls and showers
Density, magnetic susceptibility, and the characterization of ordinary chondrite falls and showers
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DOI：
10.1111/j.1945-5100.2006.tb00466.x
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发表时间：
2006-03
影响因子：
2.2
通讯作者：
G. Consolmagno;R. Macke;P. Rochette;D. Britt;J. Gattacceca
中科院分区：
文献类型：
--
作者：
G. Consolmagno;R. Macke;P. Rochette;D. Britt;J. Gattacceca
摘要-测量了梵蒂冈天文台收集的132个普通磁铁矿的体积和颗粒密度，并与它们的磁化率进行了比较（大部分使用以前测量的值;本研究采取了十项新的磁化率措施）。颗粒密度和磁化率的结合提供了一种可靠的方法来划分未风化的普通花岗岩。与传统的化学测试不同，这种方法快速，无损，并描述了整个岩石的特征，使其特别适合测量大型收藏品。该系统是不太可行的发现;广泛风化的金属铁在一个H球粒陨石可能会导致它的阴谋之间的L球粒陨石，而严重风化的L球粒陨石阴谋之间的LL组。这个系统揭示了异常的石头，可能是错误分类的陨石或错误标记的样品;在每一种情况下，陨石的磁化率不符合其推定的分类，颗粒密度也被发现是在不一致的方式与严重风化或错误识别一致。对来自五个阵雨的石头的分析表明，排除离群值，这些样品往往在颗粒与磁化率的图中紧密地聚集在其适当的组内。
Abstract— Bulk and grain densities of 132 ordinary chondrites from the Vatican Observatory collection were measured and compared with their magnetic susceptibility (for the most part using previously measured values; ten new susceptibility measures were taken for this study). Grain density and magnetic susceptibility combined provide a reliable method of classifying unweathered ordinary chondrites. Unlike traditional chemical tests, this method is fast, nondestructive, and characterizes the whole rock, making it especially appropriate for surveying large collections. The system is less viable for finds; extensive weathering of metallic iron in an H chondrite can cause it to plot among L chondrites, while heavily weathered L chondrites plot among the LL group. This system has revealed outlier stones that may be misclassified meteorites or mislabeled samples; in every case where the magnetic susceptibility of a meteorite does not fit its putative classification, the grain density is also found to be in disagreement in a manner consistent with either severe weathering or misidentification. An analysis of stones from five showers shows that, excluding outliers, these samples tend to cluster tightly within their appropriate groups in a plot of grain versus magnetic susceptibility.