Isotopic composition of carbon and nitrogen in ureilitic fragments of the Almahata Sitta meteorite

Isotopic composition of carbon and nitrogen in ureilitic fragments of the Almahata Sitta meteorite
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Almahata Sitta 陨石的尿素质碎片中碳和氮的同位素组成

DOI:
10.1111/maps.12413
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发表时间:
2015
影响因子:
2.2
通讯作者:
Downes H
Downes H
中科院分区:
地球科学3区
文献类型:
--
作者:
Downes H

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本文研究了Almahata Sitta的脲长石碎屑的碳、氮丰度和同位素组成特征。铀云母富含碳(含碳量高达7wt%),形成于太阳系历史的早期,因此铀云母中碳的起源对太阳系碳的起源具有重要意义。这些样品是在它们坠落后不久收集的,因此它们是可用的最新鲜的伊利石样品之一,并使用分步燃烧质谱法进行了分析。它们含有1.2-2.3重量%的碳;大多数在600-700 °C的温度下显示出主要的碳释放,δ 13 C的峰值为−7.3至+0.4‰,与文献中未角砾化(“单屑”)的尿石岩的值相似。它们还含有少量的低温(≤500 °C)成分(δ 13 C =约-25 ‰)。氮的整体含量(9.4-27 ppm)与未角砾化的钠长石类似,主要释放发生在600-750 °C。一个显着的较低温度下释放的氮发生在所有样品。主要释放的δ 15 N值为−53 ‰至−94‰,在报告的金刚石分离物和尿伊利石酸残留物的范围内,并确定了同位素原始氮成分。然而,它们不同于普通的多云母尿伊利石,后者更富氮且同位素更重。因此,虽然母小行星2008 TC 3无疑是一个复混合体的尿石角砾岩,但这不能从单个尿石碎片的同位素研究中推断出来。主释放δ 13 C和δ 15 N的组合值与碳质或顽火辉石的区域不重叠,这表明碳辉橄榄岩中的碳不是来自这些来源。
This study characterizes carbon and nitrogen abundances and isotopic compositions in ureilitic fragments of Almahata Sitta. Ureilites are carbon‐rich (containing up to 7 wt% C) and were formed early in solar system history, thus the origin of carbon in ureilites has significance for the origin of solar system carbon. These samples were collected soon after they fell, so they are among the freshest ureilite samples available and were analyzed using stepped combustion mass spectrometry. They contained 1.2–2.3 wt% carbon; most showed the major carbon release at temperatures of 600–700 °C with peak values of δ13C from −7.3 to +0.4‰, similar to literature values for unbrecciated (“monomict”) ureilites. They also contained a minor low temperature (≤500 °C) component (δ13C = ca −25‰). Bulk nitrogen contents (9.4–27 ppm) resemble those of unbrecciated ureilites, with major releases mostly occurring at 600–750 °C. A significant lower temperature release of nitrogen occurred in all samples. Main release δ15N values of −53 to −94‰ fall within the range reported for diamond separates and acid residues from ureilites, and identify an isotopically primordial nitrogen component. However, they differ from common polymict ureilites which are more nitrogen‐rich and isotopically heavier. Thus, although the parent asteroid 2008TC3was undoubtedly a polymict ureilite breccia, this cannot be deduced from an isotopic study of individual ureilite fragments. The combined main release δ13C and δ15N values do not overlap the fields for carbonaceous or enstatite chondrites, suggesting that carbon in ureilites was not derived from these sources.
Havero ureilite 中的超硬、透明碳形式、金刚石和次生石墨:精细尺度显微拉曼和同步加速器断层扫描。
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