On the isotopic composition of ruthenium in the Allende and Leoville carbonaceous chondrites
On the isotopic composition of ruthenium in the Allende and Leoville carbonaceous chondrites
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阿连德和莱奥维尔碳质球粒陨石中钌的同位素组成
DOI：
10.1016/0016-7037(87)90207-9
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发表时间：
1987
影响因子：
5
通讯作者：
F. Begemann
中科院分区：
文献类型：
--
作者：
H. Poths;S. Schmitt;F. Begemann
在阿连德陨石的耐酸残留物和b型包裹体的一个磁性部分和三个非磁性部分（两个来自阿连德，一个来自Leoville）中，用质谱法测量了钌的同位素组成。在96 Ru 101 Ru= 0.324851的归一化条件下，98 Ru 101 Ru和99 Ru 101 Ru的比值分别在1.6 permil和0.4 permil （3σ）范围内与地面值无明显差异。因此，在已灭绝的4.2 Myr-98 Tc和0.21 Myr-99 Tc的衰变中，我们没有发现98 Ru和99 Ru放射性成因相对量不同的证据。100 Ru - 101 Ru和104 Ru - 101 Ru分别在一个和两个案例中偏离地球规范超过2σ(≤0.6 permil)。由于陆地比例偶尔会受到更大程度的分子干扰，因此这些过丰度不能明确地归因于样品中的非线性同位素异常。102 - Ru - 101 - Ru比值在两种耐酸阿连德残留物的溶液中是正常的，但在所有四个包裹体样品中都比正常高出0.35 peril。有一种可能性，尽管非常小，这些过量是由于102钌尖峰的污染。对数据进行不那么保守的解释，并将其归一化为104 Ru 101 Ru而不是96 Ru 101 Ru，结果发现，在所有三个包裹体的非磁性部分，轻p过程同位素96 Ru和98 Ru都过丰度。
The isotopic composition of Ru has been measured mass spectrometrically in an acid resistant residue of the Allende meteorite and in one magnetic and three non-magnetic portions of type-B inclusions, two from Allende and one from Leoville. Normalized to 96 Ru 101 Ru= 0.324851, all 98 Ru 101 Ru and 99 Ru 101 Ru ratios were found to be indistinguishable from the terrestrial values within 1.6 permil and 0.4 permil (3σ), respectively. Thus, in the sampled reservoirs we find no evidence for different relative amounts of radiogenic 98 Ru and 99 Ru from the decay of now extinct 4.2 Myr-98 Tc and 0.21 Myr-99 Tc. 100 Ru 101 Ru and 104 Ru 101 Ru were found to deviate from the terrestrial norm by more than 2σ (≤ 0.6 permil) in one and two cases, respectively. Since terrestrial ratios were occasionally compromised by molecular interferences to an even larger extent, these overabundances cannot be unambiguously attributed to nonlinear isotope anomalies in the samples. The 102 Ru 101 Ru ratio is normal in two aliquants of the acid resistant Allende residue but higher than normal by up to 0.35 permil in all four inclusion samples. There is a possibility, although very remote, that these excesses are due to contamination by a 102 Ru spike. A less conservative interpretation of the data and normalization to 104 Ru 101 Ru rather than to 96 Ru 101 Ru results in overabundances of the light p-process isotopes 96 Ru and 98 Ru in the non-magnetic portions of all three inclusions.