From 2D to 3D chondrule size data: Some empirical ground truths

From 2D to 3D chondrule size data: Some empirical ground truths
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从 2D 到 3D 球粒尺寸数据:一些经验基础事实

DOI:
10.1111/maps.13091
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发表时间:
2018
影响因子:
2.2
通讯作者:
Metzler K.
Metzler K.
中科院分区:
地球科学3区
文献类型:
--
作者:
Metzler K.

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为了表征表观球粒尺寸(2D)和真实球粒尺寸(3D)之间的关系,分析了H、L和LL群的三种普通球粒陨石。大量的球粒切割面的直径薄切片(2D;n= 2037)和分离的球粒从相同的陨石(3D:n= 2061)进行了测量。获得的H、L和LL球粒陨石的二维/三维平均球粒尺寸(μm)分别为450/490、500/610和690/830;相应的中值(μm)分别为370/420、450/530和580/730。数据表明,在每个样品中存在小球粒尺寸的截止值。可能存在的特征最小尺寸的各种群体,增加(三维)序列H(~90 μm)<L(~180 μm)<LL(~240 μm)。没有发现系统的最大球粒大小。研究的样品显示出非常相似的球粒体积(质量)分布相对于其尺寸频率分布的模式(峰值)。约2.6-2.9%和97.1-97.4%的总球粒体积(质量)存在于球粒尺寸小于和大于模式,分别。结果发现,2D切片始终导致真实3D尺寸-频率分布向更小尺寸偏移。这一效应导致以下数值被低估:(1)真实平均球粒大小被低估8- 18%,(2)真实球粒中值被低估12- 21%,(3)大小频率分布的真实众数被低估12-17%(50 μm分组)。这与流行的2D/3D校正模型预测的相反(例如,Eisenhour)。
In order to characterize the relation between apparent chondrule sizes (2D) and true chondrule sizes (3D), three ordinary chondrites of the H, L, and LL group have been analyzed. The diameters of a large number of chondrule cut faces in thin sections (2D;n= 2037) and of separated chondrules from the same meteorites (3D:n= 2061) have been measured. The obtained 2D/3D mean chondrule sizes (μm) for the H, L, and LL chondrite are 450/490, 500/610, and 690/830; the corresponding median values (μm) are 370/420, 450/530, and 580/730. The data show that there is a cutoff for small chondrule sizes in each sample. Possibly characteristic minimum sizes exist for the various groups, increasing in the (3D) sequence H (~90 μm) <L (~180 μm) <LL (~240 μm). No systematics were found for the maximum chondrule sizes. The investigated samples show very similar chondrule volume (mass) distributions relative to the mode (peak) of their size‐frequency distributions. About 2.6–2.9% and 97.1–97.4% of the total chondrule volume (mass) is present in chondrule sizes smaller and larger than the mode, respectively. It was found that 2D sectioning consistently results in a shift of the true 3D size‐frequency distributions toward smaller sizes. This effect leads to the underestimation of the values for (1) the true mean chondrule size by 8–18%, (2) the true chondrule median value by 12–21%, and (3) the true mode value of the size‐frequency distributions by 12–17% (50 μm binning). This is the opposite of what popular 2D/3D correction models predict (e.g., Eisenhour ).
DOI: --
发表时间: 2006
期刊: Science Advances
影响因子: 13.6
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发表时间: 1980
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发表时间: 1975
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DOI: 10.1016/j.icarus.2012.04.022
发表时间: 2012
期刊: Icarus
影响因子: 3.2
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