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DOI | 10.1073/pnas.1912479116 |
Rapid condensation of the first Solar System solids | |
Yves Marrocchi; Johan Villeneuve; Emmanuel Jacquet; Maxime Piralla; and Marc Chaussidon | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
出版年 | 2019 |
卷号 | 116期号:47页码:23461-23466 |
英文摘要 | AbstractChondritic meteorites are composed of primitive components formed during the evolution of the Solar protoplanetary disk. The oldest of these components formed by condensation, yet little is known about their formation mechanism because of secondary heating processes that erased their primordial signature. Amoeboid Olivine Aggregates (AOAs) have never been melted and underwent minimal thermal annealing, implying they might have retained the conditions under which they condensed. We performed a multiisotope (O, Si, Mg) characterization of AOAs to constrain the conditions under which they condensed and the information they bear on the structure and evolution of the Solar protoplanetary disk. High-precision silicon isotopic measurements of 7 AOAs from weakly metamorphosed carbonaceous chondrites show large, mass-dependent, light Si isotope enrichments (–9‰ < δ30Si < –1‰). Based on physical modeling of condensation within the protoplanetary disk, we attribute these isotopic compositions to the rapid condensation of AOAs over timescales of days to weeks. The same AOAs show slightly positive δ25Mg that suggest that Mg isotopic homogenization occurred during thermal annealing without affecting Si isotopes. Such short condensation times for AOAs are inconsistent with disk transport timescales, indicating that AOAs, and likely other high-temperature condensates, formed during brief localized high-temperature events. |
英文关键词 | meteorites condensation protoplanetary disk isotopes |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205214 |
专题 | 地球科学 资源环境科学 气候变化 |
推荐引用方式 GB/T 7714 | Yves Marrocchi,Johan Villeneuve,Emmanuel Jacquet,et al. Rapid condensation of the first Solar System solids[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(47):23461-23466. |
APA | Yves Marrocchi,Johan Villeneuve,Emmanuel Jacquet,Maxime Piralla,&and Marc Chaussidon.(2019).Rapid condensation of the first Solar System solids.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(47),23461-23466. |
MLA | Yves Marrocchi,et al."Rapid condensation of the first Solar System solids".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.47(2019):23461-23466. |
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