globalchange  > 气候变化与战略
DOI: 10.1073/pnas.0806049105
论文题名:
Micrometeorites from the Transantarctic Mountains
作者: Rochette P.; Folco L.; Suavet C.; Van Ginneken M.; Gattacceca J.; Perchiazzi N.; Braucher R.; Harvey R.P.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2008
卷: 105, 期:47
起始页码: 18206
结束页码: 18211
语种: 英语
英文关键词: Antartica ; Cosmic spherules ; Scoriaceous micrometeorites ; Solar system composition ; Unmelted micrometeorites
Scopus关键词: water ; Antarctica ; astronomy ; concentration (parameters) ; dust ; geology ; measurement ; population ; priority journal ; review ; rock ; sample ; Spherules
英文摘要: We report the discovery of large accumulations of micrometeorites on the Myr-old, glacially eroded granitic summits of several isolated nunataks in the Victoria Land Transantarctic Mountains. The number (>3,500) of large (>400 μm and up to 2 mm in size) melted and unmelted particles is orders of magnitudes greater than other Antarctic collections. Flux estimates, bedrock exposure ages and the presence of ≈0.8-Myr-old microtektites suggest that extraterrestrial dust collection occurred over the last 1 Myr, taking up to 500 kyr to accumulate based on 2 investigated find sites. The size distribution and frequency by type of cosmic spherules in the >200-μm size fraction collected at Frontier Mountain (investigated in detail in this report) are similar to those of the most representative known micrometeorite populations (e.g., South Pole Water Well). This and the identification of unusual types in terms of composition (i.e., chondritic micrometeorites and spherulitic aggregates similar to the ≈480-kyr-old ones recently found in Antarctic ice cores) and size suggest that the Transantarctic Mountain micrometeorites constitute a unique and essentially unbiased collection that greatly extends the micrometeorite inventory and provides material for studies on micrometeorite fluxes over the recent (≈1 Myr) geological past. © 2008 by The National Academy of Sciences of the USA.
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被引频次[WOS]:121   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162456
Appears in Collections:气候变化与战略

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作者单位: Rochette, P., Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Aix-Marseille Université-Centre National de la Recherche, PB80 13545, Aix en Provence, Cedex 4, France; Folco, L., Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, 53100 Siena, Italy; Suavet, C., Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Aix-Marseille Université-Centre National de la Recherche, PB80 13545, Aix en Provence, Cedex 4, France; Van Ginneken, M., Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, 53100 Siena, Italy; Gattacceca, J., Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Aix-Marseille Université-Centre National de la Recherche, PB80 13545, Aix en Provence, Cedex 4, France; Perchiazzi, N., Dipartimento di Scienze Della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy; Braucher, R., Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Aix-Marseille Université-Centre National de la Recherche, PB80 13545, Aix en Provence, Cedex 4, France; Harvey, R.P., Department of Geological Sciences, Case Western Reserve University, 0900 Euclid Avenue, Cleveland, OH 44106, United States

Recommended Citation:
Rochette P.,Folco L.,Suavet C.,et al. Micrometeorites from the Transantarctic Mountains[J]. Proceedings of the National Academy of Sciences of the United States of America,2008-01-01,105(47)
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