布容尼斯-松山反轉

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布容尼斯-松山反轉是以伯納德·布容尼斯英语Bernard Brunhes松山基範命名的地質事件。地磁场約於781,000年前經歷過最近一次地磁逆轉事件。[1][2]由於逆轉過程歷時的估算眾說紛紜,各方對於確切發生年份存在分歧。有說這逆轉用了數千年才完成,[3]有說其過程應該更短,[4][5][6]甚至可能在人的一生內發生。[7]

在地球上不同的特定地點,這個逆轉的歷時估算在1,200至10,000年間。這差異取決於這特定地點處於哪個地磁緯度,而局部地區受地磁的非偶極組件影響所以經歷不同的逆轉過程。[3]

布容尼斯-松山反轉是由國際地層委員會挑選出的一個全球界线层型剖面和点位(GSSP),用以作為中更新世英语Middle Pleistocene(亦名愛奧尼亞期)開始的標竿。[8]可以為一些海洋沉積物岩芯和低空地面噴發火山岩訂定年份。有個高度推論性的研究指出布容尼斯-松山反轉與廣闊的澳亞隕石散佈區英语Australasian strewnfield有關聯。[9]

參見[编辑]

參考資料[编辑]

  1. ^ Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (编). A Geological Time Scale 2004 3rd. Cambridge University Press: Cambridge University Press. 2004: 28. ISBN 9780521786737. 
  2. ^ Global chronostratigraphical correlation table for the last 2.7 million years. International Commission on Stratigraphy. [31 March 2014]. 
  3. ^ 3.0 3.1 Bradford M. Clement. Dependence of the duration of geomagnetic polarity reversals on site latitude. Nature. 8 April 2004, 428 (6983): 637–40. Bibcode:2004Natur.428..637C. PMID 15071591. doi:10.1038/nature02459. 
  4. ^ Witze, Alexandra. Geomagnetic field flip-flops in a flash. ScienceNews. Sep 2, 2010 [3 September 2010]. 
  5. ^ Coe, R.S.; Prévot, M.; Camps, P. New evidence for extraordinarily rapid change of the geomagnetic field during a reversal (PDF). Nature. 20 April 1995, 374 (6524): 687. Bibcode:1995Natur.374..687C. doi:10.1038/374687a0. (原始内容 (PDF)存档于31 July 2010). 
  6. ^ Bogue, S. W.; Glen, J. M. G. Very rapid geomagnetic field change recorded by the partial remagnetization of a lava flow. Geophysical Research Letters. 2010, 37: L21308. Bibcode:2010GeoRL..3721308B. doi:10.1029/2010GL044286. 
  7. ^ Leonardo Sagnotti; Giancarlo Scardia; Biagio Giaccio; Joseph C. Liddicoat; Sebastien Nomade; Paul R. Renne; Courtney J. Sprain. Extremely rapid directional change during Matuyama-Brunhes geomagnetic polarity reversal. Geophys. J. Int. 21 July 2014, 199 (2): 1110–1124. Bibcode:2014GeoJI.199.1110S. doi:10.1093/gji/ggu287. 
  8. ^ Global Boundary Stratotype Section and Point. International Commission of Stratigraphy. [31 March 2014]. (原始内容存档于15 November 2012). 
  9. ^ Glass, B. P., Swincki, M. B., & Zwart, P. A. (1979). "Australasian, Ivory Coast and North American tektite strewnfields - Size, mass and correlation with geomagnetic reversals and other earth events" Lunar and Planetary Science Conference, 10th, Houston, Tex., March 19–23, 1979, p. 2535-2545.

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