Late Pleistocene geomagnetic excursion in Icelandic lavas: confirmation of the Laschamp excursion

Levi, Shaul; Audunsson, Haraldur; Duncan, Robert A.; Kristjánsson, Leó; Gillot, Pierre‐Yves; Jakobsson, Sveinn P.

doi:10.1016/0012-821x(90)90019-t

Cited by 123 publications

(68 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The minimum VDM at 41 ka BP of interval I well corresponds to interval A identified as the Laschamps excursion recorded in lavas flows from France [43] and Iceland [44], as well as in lacustrine [45] and marine sediments [46].…”

Section: Discussionsupporting

confidence: 53%

A high resolution authigenic 10Be/9Be record of geomagnetic moment variations over the last 300 ka from sedimentary cores of the Portuguese margin

Carcaillet

Bourlès

Thouveny

et al. 2004

Earth and Planetary Science Letters

106

View full text Add to dashboard Cite

show abstract

Section: Discussionsupporting

confidence: 53%

A high resolution authigenic 10Be/9Be record of geomagnetic moment variations over the last 300 ka from sedimentary cores of the Portuguese margin

Carcaillet

Bourlès

Thouveny

et al. 2004

Earth and Planetary Science Letters

106

View full text Add to dashboard Cite

show abstract

“…This date is also consistent with the island submergence curve of Lipman and Moore [this issue]. These data constrain the shallow inclination of unit 23 to have occurred very close in time to the Laschamp event, first discovered by Bonhommet and Babkine [1967] and K/Ar dated at 42.9 ± 7.8 ka [Levi et al, 1990]. The sedimentary record of Levi and 11,659 Karlin [1989] from the Gulf of California (7° higher latitude) displays a sudden shift of paleomagnetic inclination from normal steep values to +3° in this time period, which they infer to be correlative with the Laschamp event.…”

Section: Geomagnetic Phenomenasupporting

confidence: 87%

“…Low paleointensities have been associated with anamalous paleomagnetic directions in volcanics of this approximate age in Iceland [Levi et al, 1990] and France [Roperch et al, 1988;Chauvin et al, 1989] and in sediments of this age from the western Pacific [Yamazaki and loka, 1994], to name a few examples. The coincidences of age, preliminary paleointensity determinations, and anomalous inclination behavior led us to interpret this feature as possibly being associated with the Laschamp event.…”

Section: Geomagnetic Phenomenamentioning

confidence: 99%

Geomagnetic field inclinations for the past 400 kyr from the 1‐km core of the Hawaii Scientific Drilling Project

Holt¹,

Kirschvink²,

Garnier³

1996

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract.A volcanic record of geomagnetic field inclination for the past ~400 kyr at Hilo, Hawaii, has been obtained from the 941.5 m of core recovered by the Hawaii Scientific Drilling Project. The analysis of 195 lava flows reveals six instances of near-zero inclination and two instances of fully negative inclination (reverse polarity) within an otherwise normal -polarity core. In particular, flow unit 23 (~178 m depth) records a horizontal inclination and may be associated with the Laschamp event; flow units 40 and 42 (~260 m depth) record negative inclinations and are close in age to the Blake event; and flow unit 55 (~320 m depth) records a negative inclination with a relative declination change of ~75° with respect to the overlying flow and is probably the Jamaica/Biwa I/Pringle Falls event. The five instances of shallow inclination found below 400 m depth appear to have resulted from long-term secular variation as they are part of inclination swings between ~0° and ~60° with a periodicity of ~10-50 kyr. In contrast, the inclination shifts at ~178 m and ~320 m depths significantly deviate from long-term trends, suggesting the existence of at least two independent processes producing time variations of the geomagnetic field. The secular variation has a mean of 30.9° (α 95 = 2.27°), which is significantly shallower than the expected dipole mean of 36°. The dispersion (σ = 12.5°) agrees with global paleosecular variation data for 0-5 Ma and secular variation models.

show abstract

“…Only few paleointensity studies using the Thelliers' method have been reported from Icelandic lavas. Two studies were made with regard to the latest Pleistocene geomagnetic excursion of about 40 ka (Marshall et al, 1988;Levi et al, 1990), and one was on 17 Holocene lavas (Schweitzer and Soffel, 1980). Senanayake et al (1982) obtained eleven late Tertiary paleointensities from one to three specimens per lava.…”

Section: Introductionmentioning

confidence: 99%

Paleosecular Variation of Direction and Intensity from Two Pliocene-Pleistocene Lava Sections in Southwestern Iceland.

Tanaka

Kono

Kaneko

1995

J. geomagn. geoelec

View full text Add to dashboard Cite

Two lava sections in southwestern Iceland were revisited; sectoin IG of Kristjansson et al. (1988) of Brunhes chron age and section K of Wilson et al. (1972) of early Matuyama chron age. Paleodirections obtained from 22 laves at the former section do not seem to have averaged out the secular variation completely because of their small angular standard deviation, and this suggests rapid accumulation of the lavas. The latter section consists of 29 lavas and contains the Gauss to Matuyarna transition near its base. The time interval during which the laves at this section were erupted also seems to be short, judging from the small directional dispersion. Thelliers' paleointensity method was also applied to the samples from this section. A characteristic low paleointensity was obtained from the transitional lava flow. However, low paleointensities were also obtained from the lavas which erupted some time after the transition, and which record directions close to those of an axial geomagnetic dipole.

show abstract

Late Pleistocene geomagnetic excursion in Icelandic lavas: confirmation of the Laschamp excursion

Cited by 123 publications

References 28 publications

A high resolution authigenic 10Be/9Be record of geomagnetic moment variations over the last 300 ka from sedimentary cores of the Portuguese margin

A high resolution authigenic 10Be/9Be record of geomagnetic moment variations over the last 300 ka from sedimentary cores of the Portuguese margin

Geomagnetic field inclinations for the past 400 kyr from the 1‐km core of the Hawaii Scientific Drilling Project

Paleosecular Variation of Direction and Intensity from Two Pliocene-Pleistocene Lava Sections in Southwestern Iceland.

Contact Info

Product

Resources

About