Bulk mineralogy, water abundance, and hydrogen isotope composition of unequilibrated ordinary chondrites

Bulk mineralogy, water abundance, and hydrogen isotope composition of unequilibrated ordinary chondrites
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不平衡的普通球粒陨石的块体矿物学、水丰度和氢同位素组成

DOI:
10.1111/maps.14041
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发表时间:
2023
影响因子:
2.2
通讯作者:
Grant H
Grant H
中科院分区:
地球科学3区
文献类型:
--
作者:
Grant H

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早期太阳系中水的起源和运输是天体物理学和行星科学的重要课题,其应用于原太阳盘演化、行星形成和天体生物学。特别感兴趣的了解原始水运输是不平衡的普通碳酸盐岩(UOC),这已经受到非常有限的变化,因为它们的形成。使用X射线衍射和同位素比值质谱法,我们确定了21个UOC的主体矿物学、H2O含量和D/H比,这些UOC的岩石学亚型为3.00-3.9。所研究的UOC福尔斯的最低亚型含有约1重量%的水,水的丰度全球减少,增加热变质作用。此外,UOC福尔斯下降的最低子类型的D/H比升高,与一些外太阳系彗星的D/H比一样高。这并不容易与原行星盘中水的现有模型相吻合,这些模型表明D/H比在温暖的内太阳系中很低,并且径向增加。这些新的分析证实,OC母体吸积了富含D的成分,可能来自外部原太阳星云或分子云流光的注入。随着变质作用的增加,D/H比急剧下降,这表明富含D组分的相很容易通过热蚀变而被破坏。
The origin and transport of water in the early Solar System is an important topic in both astrophysics and planetary science, with applications to protosolar disk evolution, planetary formation, and astrobiology. Of particular interest for understanding primordial water transport are the unequilibrated ordinary chondrites (UOCs), which have been affected by very limited alteration since their formation. Using X‐ray diffraction and isotope ratio mass spectrometry, we determined the bulk mineralogy, H2O content, and D/H ratios of 21 UOCs spanning from petrologic subtypes 3.00–3.9. The studied UOC falls of the lowest subtypes contain approximately 1 wt% H2O, and water abundance globally decreases with increasing thermal metamorphism. In addition, UOC falls of the lowest subtypes have elevated D/H ratios as high as those determined for some outer Solar System comets. This does not easily fit with existing models of water in the protoplanetary disk, which suggest D/H ratios were low in the warm inner Solar System and increased radially. These new analyses confirm that OC parent bodies accreted a D‐rich component, possibly originating from either the outer protosolar nebula or from injection of molecular cloud streamers. The sharp decrease of D/H ratios with increasing metamorphism suggests that the phase(s) hosting this D‐rich component is readily destroyed through thermal alteration.
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