Composition and clues to the origin of refractory metal nuggets extracted from chondritic meteorites

Composition and clues to the origin of refractory metal nuggets extracted from chondritic meteorites
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从球粒陨石中提取的难熔金属块的成分和来源线索

DOI:
10.1111/maps.12366
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发表时间:
2014
影响因子:
2.2
通讯作者:
Ott U.
Ott U.
中科院分区:
地球科学3区
文献类型:
--
作者:
Schwander;Harries;Schönhense;Ott U.

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难熔金属块(RMNs)含有Os、Ir、Mo和Ru等元素,预计这些元素会与CAI矿物同时从太阳成分的冷却气体中凝结。Berg等人()在Murchison陨石的耐酸残留物中发现了大量rmn,并认为它们是原始凝聚物。为了扩展这些作者的工作,我们改进了化学萃取工艺,以增加残留物样品中RMN的浓度,并从Murchison, Allende和Leoville球粒陨石中制备了另外三种富含RMN的残留物。结果表明,虽然它们的来源明显是太阳,但这三颗陨石的RMNs的详细组成与基于平衡热力学和所有金属理想固溶体的简单冷凝模型不太匹配。因此,我们发现,像以前提出的那样,对大多数研究的颗粒来说,直接凝结的初级形成是不太可能的,在未来的工作中应该考虑其他情况。结果还表明,来自Allende和Leoville的一些(但不是全部)合金在陨石环境中经历了变质氧化和硫化等过程,在这些过程中它们丢失了W和Mo。对于Murchison和一些Leoville和Allende的RMNs,我们提出了原始性质。
Refractory metal nuggets (RMNs) contain elements, such as Os, Ir, Mo, and Ru, which are predicted to condense from a cooling gas of solar composition simultaneously with CAI‐minerals. Berg et al. () identified a large number of RMNs in acid‐resistant residues of the Murchison meteorite and suggested that they are pristine condensates. In extending the work of these authors, we have improved the chemical extraction process to enrich the concentration of RMNs in the residue sample and prepared three additional RMN‐rich residues from the chondritic meteorites Murchison, Allende, and Leoville. The results show that, while their origin is clearly solar, the compositions in detail of RMNs from all three meteorites do not match well with a simple condensation model based on equilibrium thermodynamics and ideal solid solution of all metals. Thus, we find that a primary formation by direct condensation, as suggested previously, is unlikely for most of the studied grains and that alternative scenarios should be considered in future work. The results also show that several, but not all, alloys from Allende and Leoville have undergone processes, such as metamorphic oxidation and sulfidization in the meteoritic environment, in which they lost, e.g., W and Mo. For Murchison and several Leoville and Allende RMNs, we propose a pristine nature.
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