Special Issue: Special section for IUGG workshop: Lithospheric Structure of a Supercontinent:Gondwana
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K-Ar ages of the Auckland geomagnetic excursions
Earth, Planets and Space volume 56, pages 283–288 (2004)
Abstract
K-Ar age determinations were made on two monogenetic volcanoes in the Auckland volcanic field, New Zealand, which have recorded the Auckland geomagnetic excursions. For the Wiri volcano with the north-down intermediate paleomagnetic direction, five samples gave a weighted mean age of 27 ± 5 (1σ) ka. For the Hampton Park volcano with the west-up intermediate direction, three samples gave a weighted mean of 55 ± 5 (1σ) ka. Since these two K-Ar ages are distinguished at 2σ level, it is inferred that at least two geomagnetic excursions can be recognized in Auckland. The age of the Hampton Park is barely distinguished from the established age range of the Laschamp excursion (39–45 ka) at 2σ level. The age of the Wiri coincides with the age of c. 30 ka in which excursions have been found from sedimentary and volcanic records. The reported excursions from volcanic rocks show a VGP cluster in the central to northern Pacific region which is distinct from the VGP paths or clusters during polarity reversals.
References
Allen, S. R. and I. E. M. Smith, Eruption styles and volcanic hazard in the Auckland Volcanic Field, New Zealand, Geosci. Repts. Shizuoka Univ., 20, 5–14, 1994.
Benson, L., J. Liddicoat, J. Smoot, A. Sarna-Wojcicki, R. Negrini, and S. Lund, Age of the Mono Lake excursion and associated tephra, Quat. Sci. Rev., 22, 135–140, 2003.
Bonhommet, N. and J. Zähringer, Paleomagnetism and potassium argon age determinations of the Laschamp geomagnetic polarity event, Earth Planet. Sci. Lett., 6, 43–46, 1969.
Camps, P., B. Henry, M. Prévot, and L. Faynot, Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean), J. Geophys. Res., 106, 1961–1971, 2001.
Carvallo, C., P. Camps, G. Ruffet, B. Henry, and T. Poidras, Mono Lake or Laschamp geomagnetic event recorded from lava flows in Amsterdam Island (southeastern Indian Ocean), Geophys. J. Int., 154, 767–782, 2003.
Chauvin, A., R. A. Duncan, N. Bonhommet, and S. Levi, Paleointensity of the earth’s magnetic field and K-Ar dating of the Louchadiere volcanic flow (Central France): new evidence for the Laschamp excursion, Geophys. Res. Lett., 16, 1189–1192, 1989.
Dalrymple, G. B. and M. A. Lanphere, Potassium-Argon Dating, 258 pp, Freeman, San Francisco, 1969.
Denham, C. R. and A. Cox, Evidence that the Laschamp polarity event did not occur 13,300-30,400 years ago, Earth Planet. Sci. Lett., 13, 181–190, 1971.
Grant-Taylor, T. L. and T. A. Rafter, New Zealand radiocarbon age measurements, N. Z. J. Geol. Geophys., 14(2), 364–402, 1971.
Hoffman, K. A., Long-lived transitional states of the geomagnetic field and the two dynamo families, Nature, 354, 273–277, 1991.
Itaya, T. and K. Nagao, K-Ar age determination of volcanic rocks younger than 1 Ma, Mem. Geol. Soc. Japan, 29, 143–161, 1988 (in Japanese with English abstract).
Kent, D. V., S. R. Hemming, and B. D. Turrin, Laschamp Excursion at Mono Lake?, Earth Planet. Sci. Lett., 197, 151–164, 2002.
Kermode, L. O., Geology of the Auckland urban area, Scale 1:50000, Institute of Geological and Nuclear Sciences geological map2, 63 pp, 1 map, Institute of Geological and Nuclear Sciences Ltd., Lower Hutt, New Zealand, 1992.
Laj, C., A. Mazaud, R. Weeks, M. Fuller, and E. Herrero-Bervera, Geomagnetic reversal paths, Nature, 351, 447, 1991.
Laj, C., C. Kissel, A. Mazaud, J. E. T. Channell, and J. Beer, North Atlantic palaeointensity stack since 75 ka (NAPIS-75) and the duration of the Laschamp event, Phil. Trans. R. Soc. Lond. A, 358, 1009–1025, 2000.
Laj, C., C. Kissel, V. Scao, J. Beer, D. M. Thomas, H. Guillou, R. Muscheler, and G. Wagner, Geomagnetic intensity and inclination variations at Hawaii for the past 98 kyr from core SOH-4 (Big Island): a new study and a comparison with existing contemporary data, Phys. Earth Planet. Inter., 129, 205–243, 2002.
Levi, S., H. Audunsson, R. A. Duncan, L. Kristjansson, P.-Y. Gillot, and S. P. Jakobsson, Late Pleistocene geomagnetic excursion in Icelandic lavas: confirmation of the Laschamp geomagnetic excursion, Earth Planet. Sci. Lett., 96, 443–457, 1990.
Liddicoat, J. C., Mono Lake Excursion in Mono Basin, California, and at Carson Sink and Pyramid Lake Nevada, Geophys. J. Int., 108, 442–452, 1992.
Matsumoto, A., Improvement for determination of potassium in K-Ar dating, Bull. Geol. Surv. Japan, 40, 65–70, 1989 (in Japanese with English abstract).
Matsumoto, A., K. Uto, and K. Shibata, K-Ar dating by peak comparison method: new technique applicable to rocks younger than 0.5 Ma, Bull. Geol. Surv. Japan, 40, 565–579, 1989a.
Matsumoto, A., K. Uto, and K. Shibata, Argon isotopic ratios in historic lavas: importance of correction for the initial argon in K-Ar dating of young volcanic rocks, Mass Spectr., 37, 353–363, 1989b (in Japanese with English abstract).
McDougall, I., H. A. Polach, and J. J. Stipp, Excess radiogenic argon in young subaerial basalts from the Auckland volcanic field, New Zealand, Geochim. Cosmochim. Acta, 33, 1485–1520, 1969.
Nowaczyk, N. R. and J. Knies, Magnetostratigraphic results from the eastern Arctic Ocean: AMS 14C ages and relative palaeointensity data of the Mono Lake and Laschamp geomagnetic reversal excursions, Geo-phys. J. Int., 140, 185–197, 2000.
Polach, H. A., J. Chappell, and J. F. Lovering, ANU Radiocarbon Data List III, Radiocarbon, 11, 245–262, 1969.
Roperch, P., N. Bonhommet, and S. Levi, Paleointensity of the earth’s magnetic field during the Laschamp excursion and its geomagnetic implications, Earth Planet. Sci. Lett., 88, 209–219, 1988.
Roperch, P. and R. A. Duncan, Records of geomagnetic reversals from volcanic islands of French Polynesia 1. Paleomagnetic study of a polarity transition in a lava sequence from the island of Huahine, J. Geophys. Res., 95, 2713–2726, 1990.
Searle, E. J., Auckland volcanic district, New Zealand Dept. Sci. In-dust. Res., 49, 90–103, 1965.
Shane, P., Maar drilling provides new insights into late Quaternary volcan-ism and paleoclimate in Auckland (Abstract), GSNZ Annual Conference Northland 2002, Geological Society of NZ Miscellaneous Publication, 112A, 50, 2002.
Shibuya, H., J. Cassidy, I. E. M. Smith, and T. Itaya, A geomagnetic excursion in the Brunhes epoch recorded in New Zealand basalts, Earth Planet. Sci. Lett., 111, 41–48, 1992.
Smith, I. E. M., North Island, in Intraplate volcanism in eastern Australia and New Zealand, edited by R.W. Johnson, pp. 157–162, Cambridge University Press, Cambridge, 1989.
Sudo, M., T. Tagami, K. Sato, N. Hasebe, and S. Nishimura, Calibration of a new Ar analytical system for the K-Ar dating method and analytical results of K-Ar age known samples, Mem. Fac. Sci. Kyoto Univ. Series Geol. Mineral., LVIII, 21–40, 1996.
Takaoka, N., K. Konno, Y. Oba, and T. Konda, K-Ar dating of lavas from Zao Volcano, North-eastern Japan, J. Geol. Soc. Japan, 95, 157–170, 1989 (in Japanese with English abstract).
Tanaka, H. and T. Kobayashi, Paleomagnetism of the late Quaternary On-take Volcano, Japan: directions, intensities, and excursions, Earth Planets Space, 55, 189–202, 2003.
Tatsumi, Y. and H. Tsunakawa, Cenozoic volcanism, stress gradient and back-arc opening in the North Island, New Zealand: Origin of Taupo-Rotorua Depression, The Island Arc, 1, 40–50, 1992.
Teanby, N., C. Laj, D. Gubbins, and M. Pringle, A detailed palaeointensity and inclination record from drill core SOH1 on Hawaii, Phys. Earth Planet. Inter, 131, 101–140, 2002.
Verosub, K. L. and S. K. Banerjee, Geomagnetic excursions and their paleomagnetic record, Rev. Geophys. Space Phys., 15, 145–155, 1977.
Watkins, N. D. and J. Nougier, Excursions and secular variation of the Brunhes epoch geomagnetic field in the Indian Ocean region, J. Geophys. Res., 78, 6060–6068, 1973.
Wood, I. A., Thermoluminescence dating of the Auckland and Kerikeri basalts fields, MSc thesis, University of Auckland, 1991.
Yamamoto, Y, K. Shimura, H. Tsunakawa, T. Kogiso, K. Uto, H. G. Barsczus, H. Oda, T. Yamazaki, and E. Kikawa, Geomagnetic paleosecular variation for the past 5 Ma in the Society Islands, French Polynesia, Earth Planet. Space, 54, 797–802, 2002.
Yamamoto, Y, H. Tsunakawa, and H. Shibuya, Palaeointensity study of the Hawaiian 1960 lava: implications for possible causes of erroneously high intensities, Geophys. J. Int., 153, 263–276, 2003.
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Mochizuki, N., Tsunakawa, H., Shibuya, H. et al. K-Ar ages of the Auckland geomagnetic excursions. Earth Planet Sp 56, 283–288 (2004). https://doi.org/10.1186/BF03353410
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DOI: https://doi.org/10.1186/BF03353410