An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body

doi:10.1126/sciadv.aax4184

	An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body
	Schmitz, Birger 1; Farley, Kenneth A.2; Goderis, Steven 3; Heck, Philipp R.4,5; Bergstrom, Stig M.6; Boschi, Samuele 1; Claeys, Philippe 7; Debaille, Vinciane 8; Dronov, Andrei 9,10; van Ginneken, Matthias 11
刊名	SCIENCE ADVANCES
	2019-09-01
卷号	5 期号:9 页码:10
ISSN号	2375-2548
DOI	10.1126/sciadv.aax4184
通讯作者	Schmitz, Birger(birger.schmitz@nuclear.lu.se)
英文摘要	The breakup of the L-chondrite parent body in the asteroid belt 466 million years (Ma) ago still delivers almost a third of all meteorites falling on Earth. Our new extraterrestrial chromite and He-3 data for Ordovician sediments show that the breakup took place just at the onset of a major, eustatic sea level fall previously attributed to an Ordovician ice age. Shortly after the breakup, the flux to Earth of the most fine-grained, extraterrestrial material increased by three to four orders of magnitude. In the present stratosphere, extraterrestrial dust represents 1% of all the dust and has no climatic significance. Extraordinary amounts of dust in the entire inner solar system during >2 Ma following the L-chondrite breakup cooled Earth and triggered Ordovician icehouse conditions, sea level fall, and major faunal turnovers related to the Great Ordovician Biodiversification Event.
WOS关键词	ASTEROID BREAKUP ; OXYGEN-ISOTOPE ; SPARGING OSO4 ; NOBLE-GASES ; BIODIVERSIFICATION ; RECORD ; EARTH ; CHEMOSTRATIGRAPHY ; MICROMETEORITES ; METEORITES
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	AMER ASSOC ADVANCEMENT SCIENCE
WOS记录号	WOS:000491128800054
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/28278]
专题	中国科学院紫金山天文台
通讯作者	Schmitz, Birger
作者单位	1.Lund Univ, Dept Phys, Astrogeobiol Lab, Lund, Sweden 2.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA 3.Vrije Univ Brussel, Dept Chem, Brussels, Belgium 4.Robert A Pritzker Ctr Meteorit & Polar Studies, Field Museum Nat Hist, Chicago, IL USA 5.Univ Chicago, Dept Geophys Sci, Chicago, IL USA 6.Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA 7.Vrije Univ Brussel, Analyt Environm & GeoChem, Brussels, Belgium 8.Univ Libre Bruxelles, Lab GTime, Brussels, Belgium 9.Russian Acad Sci, Geol Inst, Moscow, Russia 10.Kazan Volga Reg Fed Univ, Inst Geol & Oil & Gas Technol, Kazan, Russia
推荐引用方式 GB/T 7714	Schmitz, Birger,Farley, Kenneth A.,Goderis, Steven,et al. An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body[J]. SCIENCE ADVANCES,2019,5(9):10.
APA	Schmitz, Birger.,Farley, Kenneth A..,Goderis, Steven.,Heck, Philipp R..,Bergstrom, Stig M..,...&Terfelt, Fredrik.(2019).An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body.SCIENCE ADVANCES,5(9),10.
MLA	Schmitz, Birger,et al."An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body".SCIENCE ADVANCES 5.9(2019):10.