气候变化领域集成服务门户(CCPortal): Micrometeorites from the Transantarctic Mountains

CCPortal

DOI	10.1073/pnas.0806049105
	Micrometeorites from the Transantarctic Mountains
	Rochette P.; Folco L.; Suavet C.; Van Ginneken M.; Gattacceca J.; Perchiazzi N.; Braucher R.; Harvey R.P.
发表日期	2008
ISSN	0027-8424
起始页码	18206
结束页码	18211
卷号	105 期号:47
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.
英文关键词	Antartica; Cosmic spherules; Scoriaceous micrometeorites; Solar system composition; Unmelted micrometeorites
语种	英语
scopus关键词	water; Antarctica; astronomy; concentration (parameters); dust; geology; measurement; population; priority journal; review; rock; sample; Spherules
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159167
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-...
推荐引用方式 GB/T 7714	Rochette P.,Folco L.,Suavet C.,et al. Micrometeorites from the Transantarctic Mountains[J],2008,105(47).
APA	Rochette P..,Folco L..,Suavet C..,Van Ginneken M..,Gattacceca J..,...&Harvey R.P..(2008).Micrometeorites from the Transantarctic Mountains.Proceedings of the National Academy of Sciences of the United States of America,105(47).
MLA	Rochette P.,et al."Micrometeorites from the Transantarctic Mountains".Proceedings of the National Academy of Sciences of the United States of America 105.47(2008).