Reversal pattern and apparent polar wander for the Late Jurassic

Steiner, Maureen B.; Helsley, Charles E.

doi:10.1130/0016-7606(1975)86<1537:rpaapw>2.0.co;2

Cited by 71 publications

(62 citation statements)

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“…Reliable Jurassic poles for North America are few, the most reliable being the Callovian Summerville Formation (Steiner, 1978) and the Oxfordian-Kimmeridgian Morrison Formation (Steiner and Helsley, 1975). This was a time of rapid change of apparent pole position for North America (Steiner, 1975; in press), and the choice of direction for comparison of Leg 76 samples is therefore highly dependent on the age of the magnetization.…”

Section: Discussionmentioning

confidence: 99%

“…This was a time of rapid change of apparent pole position for North America (Steiner, 1975; in press), and the choice of direction for comparison of Leg 76 samples is therefore highly dependent on the age of the magnetization. Inclinations at this site were computed for the Summerville and the two Morrison poles (see Steiner and Helsley, 1975) and are compared to the basalt inclinations for this site in Figure 6. The average inclination of Leg 76 samples best fits the upper Morrison direction, a Late Jurassic direction.…”

Section: Discussionmentioning

confidence: 99%

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Paleomagnetism of Middle Jurassic Basalts, Deep Sea Drilling Project Leg 76

Steiner¹

1983

Initial Reports of the Deep Sea Drilling Project

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The magnetic properties of 29 m of Jurassic oceanic crust are quite ordinary. The samples from Leg 76 Hole 534A have average NRM intensities of 3.6 ± 1.7 × 10~3 Gauss, somewhat low median destructive fields, 89 ±34 Oe, and a remarkable stability of remanent directions. Very simple tests indicate a low viscosity of remanence. The NRM (26.4°± 7.9°) and demagnetized (24.7° ±7.3°) mean directions are similar to those expected for Jurassic rocks of this age. The normal polarity of the samples agrees with the location of Site 534 just seaward of Magnetic Anomaly M-28. All of the characteristics of these basalts suggest that the origin of the Jurassic seafloor magnetic quiet zone is neither a result of low intensity of magnetization nor vicosity of remanence, and that we must look to other explanations for the origin of this peculiar feature.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Paleomagnetism of Middle Jurassic Basalts, Deep Sea Drilling Project Leg 76

Steiner¹

1983

Initial Reports of the Deep Sea Drilling Project

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“…Mean poles and statistics are listed in Table 6. Dashed line tentatively connects poles for lower Morrison (lo‐Mor, ∼155 Ma) and upper Morrison (up‐Mor, ∼149 Ma) Formation of from Steiner and Helsley [1975] after correction for presumed inclination flattening corresponding to f = 0.55 and net 13° clockwise rotation of the Colorado Plateau relative to the craton of eastern North America (see text and Table 7). …”

Section: A New Composite Apw Path For the North America Cratonmentioning

confidence: 99%

“…Interestingly, in both compilations, the 20 Myr windows centered on 140 Ma and 150 Ma have few results and some are poorly defined with complicated magnetizations (e.g., Jura blue limestones). It is the results from the sedimentary Morrison Formation of Colorado [ Steiner and Helsley , 1975], that (although not listed by Besse and Courtillot [2002]) have been mainstays of Late Jurassic APW paths, and which merit attention. Steiner and Helsley [1975] found that the lithologic change that divides the sedimentary formation into two members marks a change of pole position; there are distinct lower Morrison (Oxfordian to early Kimmeridgian, ∼155 Ma) and upper Morrison (Kimmeridgian to early Tithonian, ∼149 Ma; age from Kowallis et al [1998]) poles (Table 7).…”

Section: A New Composite Apw Path For the North America Cratonmentioning

confidence: 99%

Influence of inclination error in sedimentary rocks on the Triassic and Jurassic apparent pole wander path for North America and implications for Cordilleran tectonics

Kent¹,

Irving²

2010

J. Geophys. Res.

182

263

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[1] Because of paleomagnetic inclination error (I error) in sedimentary rocks, we argue that previous estimates of Triassic and Jurassic paleolatitudes of the North American craton have generally been too low, the record being derived mostly from sedimentary rocks. Using results from all major cratons, we construct a new composite apparent pole wander (APW) path for Triassic through Paleogene based on 69 paleopoles ranging in age from 243 to 43 Ma. The poles are from igneous rocks and certain sedimentary formations corrected for I error brought into North American coordinates using plate tectonic reconstructions. Key features of the new APW path are a 25°northward progression from 230 to 190 Ma to high latitudes (off northernmost Siberia) where the pole lingers until 160 Ma, a jump to the Aleutians followed by a hook in western Alaska by ∼145 Ma that leads to the 130-60 Ma stillstand, after which the pole moves to its present position. As an example of the application of this new path we use paleomagnetic results to determine that southern Wrangellia and Stikinia (W/S), the two most westerly terranes in the Canadian Cordillera, lay 630 to 1650 km farther south than at present relative to the craton during the Late Triassic and Early Jurassic. This is consistent with an exotic Tethyan origin as paleontological and mantle geochemical evidences imply. During the Late Triassic through Early Cretaceous, W/S moved northward more slowly than the craton, implying oblique sinistral net convergence over this 130 Myr interval. This was followed by dextral shear in latest Cretaceous through Eocene.

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“…Kuparuk River sampling site shown by black star. Other published poles shown: -166Ma Moat volcanics pole (MV at 82"N,09OoE) from Van Fossen & Kent (1990); Late Jurassic Front Range Morrison pole (FRM, dashed small circle) from Van Fossen & Kent (1992b); 172 Ma Corral Canyon pole (CC at 62"N, 116"E) from May et al (1986); 151 Ma Glance conglomerate pole (G) from Kluth et al (1982); and late Jurassic Colorado Plateau Morrison Formation (LM: lower, UM: upper) fromSteiner & Helsley (1975).…”

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confidence: 98%

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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Reversal pattern and apparent polar wander for the Late Jurassic

Cited by 71 publications

References 0 publications

Paleomagnetism of Middle Jurassic Basalts, Deep Sea Drilling Project Leg 76

Paleomagnetism of Middle Jurassic Basalts, Deep Sea Drilling Project Leg 76

Influence of inclination error in sedimentary rocks on the Triassic and Jurassic apparent pole wander path for North America and implications for Cordilleran tectonics

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

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