Paleomagnetic Reference Poles, Apparent Polar Wander Paths, Paleomagnetic Euler Pole Analysis, and True Polar Wander

Geissman, J. W.; Gordon, Richard G.

doi:10.1002/rog.1991.29.s1.384

Cited by 3 publications

(1 citation statement)

References 124 publications

(136 reference statements)

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“…The Late Jurassic through Early Cretaceous track has critical implications for the motion of western Cordillera suspect terranes because it predicts rapid northward motion for cratonic North America (e.g., May et at, 1989;Butler et al, 1991). Geissman and Gordon (1991) have already hinted at possible overprinting problems with the Morrison poles. Given the importance of these data, we sampled the Morrison Formation at 15 sites in a different setting, in the Front Range of Colorado (off the Colorado Plateau), where a fold test for paleomagnetic stability could be applied.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetism of the Front Range (Colorado) Morrison Formation and an alternative model of Late Jurassic North American apparent polar wander

Fossen

Kent

1992

Geol

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A paleomagnetic study of the Upper Jurassic Morrison Formation in the Front Range of central Colorado yields high-unblockingtemperature, dual-polarity magnetizations. With respect to known paleohorizontal, the inclinations (absolute mean = 57.3 0 , 95% confidence interval == 52.3 0 to 63.10, N = 8 sites) pass tilt and reversal tests, wbereas the dispersion in declinations can be attributed to apparent or real tectonic rotations and sedimentary processes. The site-centered colatitudinallocus of possible Front Range Morrison poles partially overlaps the "upper" pole, but it excludes the "lower" pole from the Morrison Formation on the Colorado Plateau as weD as the 151 Ma Glance conglomerate pole from the Basin and Range province of southeastern Arizona. We offer various explanations for these disparities and suggest an alternative model of Late Jurassic North American apparent polar wander through-70 0 N which is supported by Late Jurassic European poles (with positive stability tests) transferred to North American coordinates.

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Section: Introductionmentioning

confidence: 99%

Paleomagnetism of the Front Range (Colorado) Morrison Formation and an alternative model of Late Jurassic North American apparent polar wander

Fossen

Kent

1992

Geol

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Plate Motion

Gordon

1991

Reviews of Geophysics

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A Palaeomagnetic Study of 143 Ma Kimberlite Dikes In Central New York State

Fossen¹,

Kent²

1993

Geophysical Journal International

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SUMMARY A palaeomagnetic study of 143 Ma serpentinized kimberlite dikes near Ithaca, New York, yields a dual‐polarity, high unblocking temperature, and high coercivity magnetization which passes the reversal test and two baked contact tests. the mean pole position (58°N, 203°E; A95 = 3.8°, N = 7) differs from published late Jurassic‐early Cretaceous North American poles currently used to define the apparent polar wander path. the angular dispersion in mean directions (θ63= 3.5°) is low but the presence of reversals argues that the Ithaca kimberlites magnetization should represent sufficient time for averaging of palaeosecular variation. Similar findings apparently typify palaeomagnetic studies of other serpentinized kimberlite, supporting the suggestion that thermo‐chemical remanent magnetization in this lithology prolongs the duration of magnetization acquisition sufficiently to average secular variation per dike. A consistent but weak foliation in anisotropy of ARM parallels the N‐S and vertical orientation of the Ithaca dikes, but is apparently unrelated to the northwest‐down or southeast‐up remanence. The Ithaca kimberlites pole may therefore record a previously undocumented sharp bend or ‘cusp’ at ˜143 Ma, and the initiation of a Cretaceous and Cenozoic interval of apparent polar wander that generally follows a great circle along the 200°E meridian to geographic north. A coeval (˜145 Ma) kimberlite pole from southern Africa transferred to North America agrees with the Ithaca kimberlites pole position whereas reported poles from the Berriasian stratotype (southern France) and 144 Ma Svalbard dolerites provide less diagnostic tests of the Ithaca kimberlites pole due in part to uncertainties in Europe‐North America reconstructions.

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Paleomagnetic Reference Poles, Apparent Polar Wander Paths, Paleomagnetic Euler Pole Analysis, and True Polar Wander

Cited by 3 publications

References 124 publications

Paleomagnetism of the Front Range (Colorado) Morrison Formation and an alternative model of Late Jurassic North American apparent polar wander

Paleomagnetism of the Front Range (Colorado) Morrison Formation and an alternative model of Late Jurassic North American apparent polar wander

Plate Motion

A Palaeomagnetic Study of 143 Ma Kimberlite Dikes In Central New York State

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