Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1720167115 |
Multiple generations of grain aggregation in different environments preceded solar system body formation | |
Ishii, Hope A.1; Bradley, John P.1; Bechtel, Hans A.2; Brownlee, Donald E.3; Bustillo, Karen C.4; Ciston, James4; Cuzzi, Jeffrey N.5; Floss, Christine6; Joswiak, David J.3 | |
2018-06-26 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:26页码:6608-6613 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The solar system formed from interstellar dust and gas in a molecular cloud. Astronomical observations show that typical interstellar dust consists of amorphous (a-) silicate and organic carbon. Bona fide physical samples for laboratory studies would yield unprecedented insight about solar system formation, but they were largely destroyed. The most likely repositories of surviving presolar dust are the least altered extraterrestrial materials, interplanetary dust particles (IDPs) with probable cometary origins. Cometary IDPs contain abundant submicron a-silicate grains called GEMS (glass with embedded metal and sulfides), believed to be carbon-free. Some have detectable isotopically anomalous a-silicate components from other stars, proving they are preserved dust inherited from the interstellar medium. However, it is debated whether the majority of GEMS predate the solar system or formed in the solar nebula by condensation of high-temperature (>1,300 K) gas. Here, we map IDP compositions with single nanometer-scale resolution and find that GEMS contain organic carbon. Mapping reveals two generations of grain aggregation, the key process in growth from dust grains to planetesimals, mediated by carbon. GEMS grains, some with a-silicate subgrains mantled by organic carbon, comprise the earliest generation of aggregates. These aggregates (and other grains) are encapsulated in lower-density organic carbon matrix, indicating a second generation of aggregation. Since this organic carbon thermally decomposes above similar to 450 K, GEMS cannot have accreted in the hot solar nebula, and formed, instead, in the cold presolar molecular cloud and/or outer protoplanetary disk. We suggest that GEMS are consistent with surviving interstellar dust, condensed in situ, and cycled through multiple molecular clouds. |
英文关键词 | dust accretion solar system origin interstellar dust cosmic dust |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000436245000053 |
WOS关键词 | INTERPLANETARY DUST PARTICLES ; ULTRACARBONACEOUS ANTARCTIC MICROMETEORITES ; INTERSTELLAR DUST ; ORGANIC-MATTER ; SIZE DISTRIBUTION ; COSMIC DUST ; NEBULA ; ORIGIN ; METEORITES ; EVOLUTION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/204939 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA; 2.Lawrence Berkeley Natl Lab, Adv Light Source Div, Berkeley, CA 94720 USA; 3.Univ Washington, Dept Astron, Seattle, WA 98195 USA; 4.Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Mol Foundry, Berkeley, CA 94720 USA; 5.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA; 6.Washington Univ, Lab Space Sci, St Louis, MO 63130 USA |
推荐引用方式 GB/T 7714 | Ishii, Hope A.,Bradley, John P.,Bechtel, Hans A.,et al. Multiple generations of grain aggregation in different environments preceded solar system body formation[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(26):6608-6613. |
APA | Ishii, Hope A..,Bradley, John P..,Bechtel, Hans A..,Brownlee, Donald E..,Bustillo, Karen C..,...&Joswiak, David J..(2018).Multiple generations of grain aggregation in different environments preceded solar system body formation.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(26),6608-6613. |
MLA | Ishii, Hope A.,et al."Multiple generations of grain aggregation in different environments preceded solar system body formation".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.26(2018):6608-6613. |
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