Origin of regional geomagnetic variations recorded by Wisconsinan and Holocene sediments from Lake Michigan, U.S.A., and Lake Windermere, England

Creer, K. M.; Gross, David L.; Lineback, Jerry Alvin

doi:10.1130/0016-7606(1976)87<531:oorgvr>2.0.co;2

Cited by 77 publications

(22 citation statements)

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“…They have provisionally dated the excursion at between 8,000 and 10,000 years B.P., but since this is based on only one •4C date, the age control on this excursion is rather weak. A similar problem in age determination occurs in a parallel study of the same sediments by Creer et al [1976a]. They have observed an extremely low inclination (20 ø ) at the bottom of one core in Lake Michigan sediments.…”

Section: In Northmentioning

confidence: 57%

Geomagnetic excursions and their paleomagnetic record

Verosub¹,

Banerjee²

1977

Reviews of Geophysics

120

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The paleomagnetic record of recent lake and marine sediments contains anomalous magnetic directions which have been interpreted as large-scale fluctuations of the geomagnetic field (excursions). In view of the many ways in which isolated distortions of the paleomagnetic recording process can arise, proof of the existence of an excursion must depend on consistent results from within a given lake or marine environment as well as from adjacent sedimentary environments. A critical review of the proposed excursions reveals that although some excursions probably did occur, there is not yet sufficient evidence to confirm the existence of many of the claimed excursions. When the existence of regional or global excursions is established, additional information will become available on the nature of the geomagnetic field, on the use of excursions as time-stratigraphic horizons, and on possible correlations between geomagnetic activity and climatic change.

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Section: In Northmentioning

confidence: 57%

Geomagnetic excursions and their paleomagnetic record

Verosub¹,

Banerjee²

1977

Reviews of Geophysics

120

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“…The 24 loops may be considered to span cuts 23-3 and this implies a mean cycle period of 1.1 + 0.5 ka. This is low compared with period estimates of declination cycles of 2.0 ka from Lake Erie (Creer et al 1976a), 2.1 ka from Lake Michigan (Creer et al 1976b), and 2.8 ka from Lake Windermere (Thompson 1975) and the Black Sea (Creer 1974). These sites are at about the same latitude as the VCCL site.…”

Section: Discussion Of the Vccl Recordmentioning

confidence: 55%

The paleomagnetism and U–Th dating of three Canadian speleothems: evidence for the westward drift, 5.4–2.1 ka BP

Latham¹,

Schwarcz²,

Ford³

et al. 1982

Can. J. Earth Sci.

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Three speleothems from western Canada have been analyzed for their paleomagnetism and U-Th activity ratios. These cave deposits do not appear to show the kind of depositional effects on the recorded magnetic signal as is often the case with sediments. In addition the signal may be referred directly to geographic coordinates so that virtual geomagnetic pole plots may be constructed. This in turn has allowed assessment of any possible bias of the paleofield.The U-Th activity ratios of two flowstones from the Crowsnest Pass area of British Columbia indicated ages greater than the 350 ka dating limit of the dating method. One of the samples was reversely magnetized. Besides their use in the study of the ancient field, these samples have useful geomorphic applications. A stalagmite from Vancouver Island was shown to have recorded 2f clockwise loops of the field vector in the period 5.4-2.1 ka BP. This implies a mainly westward drift of the paleofield for this period; the corresponding VGP's were mostly far-sided and slightly left-handed.Trois sp61Cothbmes de I'ouest du Canada ont Ct C analysbs pour leur paltomagnCtisme et pour dkterminer les rapports d'activitk U-Th. Ces dC@ts de caverne ne semblent pas prksenter le m&me genre d'effets de dkposition provoquCs sur les signaux magnCtiques que I'on retrouve frkquemrnent avec les sediments. En plus, le signal peut &tre rattach6 directement h des coordonnbes gkographiques et ainsi permettre de construire les diagrammes des pBles gComagnCtiques virtuels. On peut alors Cvaluer toute dCviation possible du palCochamp.Les rapports d'activitk U-Th de deux coulCes de la rCgion du col Crowsnest, en Colombie-Britannique, ont indique des Lges sup6rieurs aux 350 ka correspondant h la limite de la mCthode de datation. Un des Cchantillons montre une aimantation inverste., A part leur utilitt pour I'btude des anciens champs magnktiques, ces Cchantillons peuvent semir pour des applications gComorphologiques. Un Cchantillon de stalagmite de l'ile de Vancouver a Ct C marquC par 2,5 boucles du vecteur du champ, dans le sens du mouvement des aiguilles d'une montre, durant la periode 5,4-2,l ka avant le prksent. Cela implique une dCrive du palCochamp principalement en direction ouest durant cette pCriode; les " V G P correspondants Ctaient surtout tloignks et ICgbrement senestres.Can.

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“…Also paleomagnetic results recorded by sediments from Lakes Michigan, Erie (U.S.A.), and Windermere (England) (CREER et al, 1976) confirm the fluctuations of the main dipole during the past 10,000 years ( Fig. 21b) as well as the deviation of the actual geomagnetic pole into Pacific (11,500B.P.-low inclinations).…”

Section: Paleomagnetic Characteristics and The Long-range Developmentmentioning

confidence: 55%

“…The periodicities of the long-term variations of the geomagnetic field (Figs. 19, 21, (CREER et al, 1976). East-west extremes are labeled A through K and virtual pole positions for both localities Windermere and Michigan O given at the bottom show that the main oscillating source seems to be the main geomagnetic dipole.…”

Section: Paleomagnetic Characteristics and The Long-range Developmentmentioning

confidence: 99%

Mechanism of the relations between the changes of the geomagnetic field, solar corpuscular radiation, atmospheric circulation, and climate.

Bucha

1980

J. geomagn. geoelec

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The correlations between geomagnetic, climatic, and meteorological phenomena were investigated with the object of demonstrating the function of the geomagnetic pole and changes of its position in controlling the climate and weather. A tentative model has been proposed to enable one to understand the causes of the generation of glacial and interglacial periods, as well as the causes which effect changes of climate (BUCHA, 1976a).The analyses of various types of geomagnetic and atmospheric manifestations have disclosed certain associations. The coincidence in the occurrence of increased spectral densities with regard to geomagnetic activity and the variations of atmospheric pressure over the geomagnetic pole shows the relation between their periodicities. The results imply that the changes in the intensity of corpuscular radiation, indicated by geomagnetic activity, affect the temperature and pressure patterns over the geomagnetic pole and polar region significantly, so that a pronounced modification of the general circulation may take place, as shown schematically (BUCHA, 1976b).As a result of investigating the relations between the variations of geomagnetic activity and meteorological factors a mechanism of solar-terrestrial relationships and a model of the changes of atmospheric circulation in the Northern Hemisphere are proposed; this provides a probable explanation of the causes of the fluctuation of the climate, of dry and cold periods and of differing vegetation conditions in various years in dependence on the intensity of geomagnetic activity (BUCHA, 1976(BUCHA, b, 1977.

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Origin of regional geomagnetic variations recorded by Wisconsinan and Holocene sediments from Lake Michigan, U.S.A., and Lake Windermere, England

Cited by 77 publications

References 0 publications

Geomagnetic excursions and their paleomagnetic record

Geomagnetic excursions and their paleomagnetic record

The paleomagnetism and U–Th dating of three Canadian speleothems: evidence for the westward drift, 5.4–2.1 ka BP

Mechanism of the relations between the changes of the geomagnetic field, solar corpuscular radiation, atmospheric circulation, and climate.

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