Hostname: page-component-76fb5796d-45l2p Total loading time: 0 Render date: 2024-04-25T07:09:09.168Z Has data issue: false hasContentIssue false
  • English
  • Français

Geomagnetic Strength Over the Last 50,000 Years and Changes in Atmospheric 14C Concentration: Emerging Trends

Published online by Cambridge University Press:  18 July 2016

Mike Barbetti
Mike Barbetti*
Affiliation:
Physics Department, University of Adelaide, GPO Box 498, Adelaide 5001, Australia
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Palaeomagnetic field strength measurements for the last 50,000 years are summarized. The period before ~12,000 yr bp is characterized by low dipole moments, but high values are associated with the Lake Mungo polarity excursion between ~32,000 and ~28,000 yr bp. The variation since 12,000 yr bp, based on new results from Australia and published data from the Northern Hemisphere has a quasi-cyclic appearance with maxima at ~10,000 and ~3500 yr bp. The geomagnetic record is used to predict variations in atmospheric 14C concentration, and the results are compared with independent comparisons between 14C and other dating methods. Long-term variations in the 14C time-scale are readily explained by known geomagnetic changes.

Type
Natural 14C Variations
Information
Radiocarbon , Volume 22 , Issue 2 , 1980 , pp. 192 - 199
Copyright
Copyright © The American Journal of Science 

References

Barbetti, Mike and Flude, K, 1979, Geomagnetic variation during the late Pleistocene period and changes in the radiocarbon time-scale: Nature, v 279, p 202–205.CrossRefGoogle Scholar
Barbetti, Mike and Polach, H A, 1973, ANU radiocarbon date list V: Radiocarbon, v 15, p 241–251.Google Scholar
Barton, C E, Merrill, R T, and Barbetti, Mike, 1979, Intensity of the earth's magnetic field over the last 10,000 years: Phys Earth Planetary Interiors, v 20, p 96–111.Google Scholar
Berger, Rainer and Suess, H, eds, 1979, Radiocarbon dating, International radiocarbon conference, 9th, Proc: Los Angeles, Univ California Press, 787 p.Google Scholar
Chappell, J and Veeh, H H, 1978, 230Th/234U age support of an interstadial sea level of −40m at 30,000 yr BP: Nature, v 276, p 602–604.CrossRefGoogle Scholar
Clark, R M, 1975, A calibration curve for radiocarbon dates: Antiquity, v 49, p 251–266.Google Scholar
Cox, A, 1969, Geomagnetic reversals: Science, v 163, p 237–245.Google Scholar
Elsasser, W, Ney, E P, and Winckler, J R, 1956, Cosmic ray intensity and geomagnetism: Nature, v 178, p 1226–1227.Google Scholar
Evin, J, Marien, G, and Pachiaudi, Ch, 1976, Lyon natural radiocarbon measurements VI: Radiocarbon, v 18, p 60–88.Google Scholar
Fleming, S J and Stoneham, D, 1973, The subtraction technique of thermoluminescent dating: Archaeometry, v 15, p 229–238.CrossRefGoogle Scholar
Gunn, N M and Murray, A S, in press, Geomagnetic field magnitude variations in Peru derived from archaeological ceramics: Royal Astron Soc Geophys Jour, in press.Google Scholar
Gupta, S K, 1973, Stability of Saurashtra coast during the late Quaternary and silting of the Rann of Kutch during the Holocene: PhD thesis, Indian Inst Technol, Powai, Bombay.Google Scholar
Houtermans, J C, Suess, H E, and Oeschger, H, 1973, Reservoir models and production rate variations of natural radiocarbon: Jour Geophys Research, v 78, p 1897–1908.CrossRefGoogle Scholar
Huxtable, J and Aitken, M J, 1977, Thermoluminescent dating of Lake Mungo geomagnetic polarity excursion: Nature, v 265, p 40–41.CrossRefGoogle Scholar
Kaufman, A, 1971, U-series dating of Dead Sea Basin carbonates: Geochim et Cosmochim Acta, v 35, p 1269–1281.Google Scholar
Kaufman, A and Broecker, W S, 1965, Comparison of 230Th and 14C ages for carbonate materials from Lakes Lahontan and Bonneville: Jour Geophys Research, v 70, p 4039–4054.CrossRefGoogle Scholar
Lingenfelter, R E and Ramaty, R, 1970, Astrophysical and geophysical variations in C-14 production, in Olsson, I U, ed, Radiocarbon variations and absolute chronology, Nobel symposium 12, Internatl radiocarbon conf, 7th, Proc: Stockholm, Almqvist & Wiksell, p 513–535.Google Scholar
Olsson, I, ed, 1970, Radiocarbon variations and absolute chronology, Nobel symposium 12, Internatl radiocarbon conf, 7th, Proc: Stockholm, Almqvist & Wiksell.Google Scholar
Ottaway, B and Ottaway, J H, 1974, Irregularities in dendrochronological calibration: Nature, v 250, p 407–408.Google Scholar
Peng, T H, Goddard, J, and Broecker, W S, 1978, A direct comparison of 14C and 230Th ages at Searles Lake, California: Quaternary Research, v 9, p 319–329.Google Scholar
Rafter, T A and Grant-Taylor, T, eds, 1972, International conference on radiocarbon dating, 8th, Proc: Wellington, Royal Society of New Zealand.Google Scholar
Schvoerer, M, Lamarque, P, and Rouanet, J F, 1974, Datation absolue par thermoluminescence. Étude d'une série d'échantillons d'origine achéologique dont deux fragments de grés brulés provenant de niveaux magdaleniens IV et VI: Acad sci [Paris] Comptes rendus, sér B, v 279, p 191–194.Google Scholar
Stuiver, Minze, 1964, Carbon isotopic distribution and correlated chronology of Searles lake sediments: Am Jour Sci, v 262, p 377–392.CrossRefGoogle Scholar
Stuiver, Minze 1971, Evidence for the variation of atmospheric C14 content in the Late Quaternary, in Turekian, K K, ed, The Late Cenozoic glacial ages: New Haven, Yale Univ Press, p 57–70.Google Scholar
Stuiver, Minze and Smith, G I, 1979, Radiocarbon ages of stratigraphie units: US Geol Survey Prof Paper 1043, p 69–78.Google Scholar
Tanaka, H, 1978, Geomagnetic paleointensities during the past 30,000 years in Japan: Rock magnetism and paleogeophysics, v 5, p 95–97.Google Scholar
Tauber, H, 1970, The Scandinavian varve chronology and 14C dating, in Olsson, I U, ed, Radiocarbon variations and absolute chronology, Nobel symposium 12, Internatl radiocarbon conf, 7th, Proc: Stockholm, Almqvist & Wiksell, p 173–196.Google Scholar
Veeh, H H and Veevers, J J, 1970, Sea level at −175m off the Great Barrier Reef 13,600 to 17,000 year ago: Nature, v 226, p 536–537.Google Scholar
Vogel, J C and Waterbolk, H T, 1972, Groningen radiocarbon dates X: Radiocarbon, v 14, p 6–110.Google Scholar
Wada, M and Inoue, A, 1966, Relation between the carbon-14 production rate and the geomagnetic moment: Jour Geomagnetism Geoelectricity, v 18, p 485–488.CrossRefGoogle Scholar
Walton, D, 1979, Geomagnetic intensity in Athens between 2000 BC and AD 400: Nature, v 277, p 643–644.CrossRefGoogle Scholar
Zimmerman, D W and Huxtable, J, 1971, Thermoluminescent dating of Upper Palaeolithic fired clay from Dolní Vestonice: Archaeometry, v 13, p 53–58.Google Scholar