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Laser microprobe noble gases and nitrogen analysis of chondrules from the Dhajala chondrite
Meteoritics and Planetary Science ( IF 2.2 ) Pub Date : 2020-09-08 , DOI: 10.1111/maps.13565
Ramakant R. Mahajan 1
Affiliation  

Noble gases and nitrogen are investigated in eight individual chondrules of the Dhajala H3.8 chondrite. The mean cosmic ray exposure age of the chondrules using 21Ne and 38Ar is 5.9 ± 3.0 Ma. There is no significant evidence of a pre‐exposure for these chondrules. All the measured chondrules contain variable amounts of radiogenic 129Xe. Noble gas analysis indicates Q‐type gas incorporated in the chondrules. The chondrules have variable amounts of N2. The chondrules have distinct trapped N isotopic composition (δ15Nt varies from −24.1 ± 8.4‰ to 89.1 ± 12.7‰), which is inconsistent with Q‐gas and solar wind. These inconsistencies can be considered preliminary evidence in support of multiple trapped components in the chondrules. A heavy N signature component is observed in the chondrules studied contrasted with the solar wind composition. There is no correlation between the concentration of N2 and noble gases. Derivations of variable nitrogen observed in Dhajala (H3.8) chondrules reflect the gas captured at the time of formation, having heterogeneous isotopic signature in the nebula.

中文翻译:

Dhajala球粒陨石的激光微探针稀有气体和球藻的氮分析

在Dhajala H3.8球粒陨石的八个单独球粒中研究了稀有气体和氮气。使用21 Ne和38 Ar的球体的平均宇宙射线暴露年龄为5.9±3.0 Ma。没有明显证据表明这些软骨预先接触。所有测得的软骨都包含可变数量的放射源129 Xe。稀有气体分析表明,Q型气体混入了球状晶体中。软骨具有可变量的N 2。所述球粒具有不同的截留Ñ同位素组成(δ 15 Ñ变化范围为−24.1±8.4‰至89.1±12.7‰),这与Q气和太阳风不一致。这些不一致可以被视为支持软骨中多个被困成分的初步证据。与太阳风成分相比,在研究的球囊中观察到了重的N标记成分。N 2的浓度与稀有气体之间没有相关性。在Dhajala(H3.8)软骨中观察到的可变氮的衍生物反映了形成时捕获的气体,在星云中具有异质同位素特征。
更新日期:2020-10-12
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