布容尼斯-松山反转
最近一次的地磁逆轉事件
布容尼斯-松山反转是以伯纳德·布容尼斯和松山基范命名的地质事件。地磁场约于 781,000 年前经历最近一次的地磁逆转事件。[1][2]由于逆转过程历时的估算众说纷纭，各方对于确切发生年份的看法存在分歧。有说这逆转经过了数千年才完成，[3]有说其过程应该更短，[4][5][6]甚至可能在人的一生内发生。[7]
在地球上不同的特定地点，这个逆转的历时估算在 1,200 至 10,000 年间。这差异取决于这特定地点处于哪个地磁纬度，而局部地区受地磁的非偶极组件影响所以经历不同的逆转过程。[3]
布容尼斯-松山反转是由国际地层委员会挑选出的一个全球界线层型剖面和点位（GSSP），用以作为更新世早期的卡拉布里亚期和中期的千叶期的分界。[8]可以为一些海洋沉积物岩芯和低空地面喷发火山岩订定年份。有个高度推论性的研究指出布容尼斯-松山反转与广阔的澳亚散布区有关联。[9]
参见
编辑参考资料
编辑- ^ 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.
- ^ Global chronostratigraphical correlation table for the last 2.7 million years. International Commission on Stratigraphy. [31 March 2014]. （原始内容存档于2016-06-10）.
- ^ 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.
- ^ Witze, Alexandra. Geomagnetic field flip-flops in a flash. ScienceNews. Sep 2, 2010 [3 September 2010]. （原始内容存档于2012-09-27）.
- ^ 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）.
- ^ 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.
- ^ 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.
- ^ Global Boundary Stratotype Section and Point. International Commission of Stratigraphy. [31 March 2014]. （原始内容存档于15 November 2012）.
- ^ 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" （页面存档备份，存于互联网档案馆） Lunar and Planetary Science Conference, 10th, Houston, Tex., March 19–23, 1979, p. 2535-2545.
延伸阅读
编辑- Behrendt, J.C., Finn, C., Morse, L., Blankenship, D.D. "One hundred negative magnetic anomalies over the West Antarctic Ice Sheet (WAIS), in particular Mt. Resnik, a subaerially erupted volcanic peak, indicate eruption through at least one field reversal （页面存档备份，存于互联网档案馆）" University of Colorado, U.S. Geological Survey, University of Texas. (U.S. Geological Survey and The National Academies); USGS OF-2007-1047, Extended Abstract 030. 2007.