A review of the paleomagnetism of Australia and Antarctica

Embleton, B. J. J.

doi:10.1029/gd002p0077

Cited by 52 publications

(50 citation statements)

References 86 publications

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“…During the Cretaceous, Australia was rotated clockwise relative to its present orientation by approximately 30° to 60° (e.g., Embleton, 1984;Idnurm, 1985). We were able to observe this rotation in our sample suites by applying two techniques: for Hole 765C, the hole deviation provided a means of measuring actual declination on the minicores; and for Hole 766A, the angular difference between secondary and primary vectors was computed.…”

Section: Rotation Of Sitesmentioning

confidence: 97%

“…3). The Australian Plate has experienced approximately 45° of clockwise rotation since the Early Cretaceous (e.g., Embleton, 1984;Idnurm, 1985); therefore, the direction of present-day "north" overprints removed upon low levels of demagnetization aided in deciphering the polarity of the samples. The sites are and were south of the equator, therefore upward (negative) inclinations indicate normal polarity.…”

Section: Polarity Interpretations Characteristic Directions and Ratmentioning

confidence: 99%

“…Idnurm (1985) incorporates an "Early Cretaceous" pole averaged from 25 sediment samples within the Otway Basin. A set of predicted paleolatitudes and declinations using the "interpolated" polar wander path of Embleton (1984) is presented in Table 2.…”

Section: Comparison To Australian Polar Wander Pathmentioning

confidence: 99%

“…Embleton (1984) interpolated the Early Cretaceous motion of Australia as a smooth arc between two poles of "Oxfordian-Tithonian" and Albian age, derived from intrusives and basalt flows, respectively. Idnurm (1985) incorporates an "Early Cretaceous" pole averaged from 25 sediment samples within the Otway Basin.…”

Section: Comparison To Australian Polar Wander Pathmentioning

confidence: 99%

“…A stratigraphic plot was prepared for each site that displayed depth, core recover, lithologic units, biostratigraphic ages, inclination and intensity of characteristic magnetization, and interpre- Paleopositions and rotations of the sites are computed from the Australian apparent polar wander path of Embleton (1984), in turn based on Embleton (1981) and Embleton and McElhinny (1982), with his interpolated poles shown in italics. Exceptions are the "early Miocene" and "Eocene/Paleocene," which incorporate later paleomagnetic data from Idnurm (1985 tation of polarity zones (Figs.…”

Section: Magnetostratigraphy and Assignment Of Polarity Chronsmentioning

confidence: 99%

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Lower Cretaceous Magnetostratigraphy and Paleolatitudes off Northwest Australia, ODP Site 765 and DSDP Site 261, Argo Abyssal Plain, and ODP Site 766, Gascoyne Abyssal Plain

Ogg¹,

Kodama²,

Wallick³

1992

Proceedings of the Ocean Drilling Program

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Lower Cretaceous sediments were sampled for magnetostratigraphy at three sites. ODP Site 765 and DSDP Site 261, in the Argo Abyssal Plain, consist primarily of brownish-red to gray claystone having hematite and magnetite carriers of characteristic magnetization. ODP Site 766, in the Gascoyne Abyssal Plain, consists mainly of dark greenish-gray volcaniclastic turbidites with magnetite as the carrier of characteristic magnetization. Progressive thermal demagnetization (Sites 765 and 261) or alternating field demagnetization (Site 766) yielded well-defined polarity zones and a set of reliable paleolatitudes.Magnetic polarity chrons were assigned to polarity zones using biostratigraphic correlations. Late Aptian chron M"-l"r, a brief reversed-polarity chron younger than MOr, is a narrow, 40-cm feature delimited in Hole 765C. Early Aptian reversed-polarity chron MOr is also present in Hole 765C. Polarity chrons Mir through M3r were observed in the Barremian of all three sites. Valanginian and Hauterivian polarity chrons can be tentatively assigned to polarity zones only in Hole 766A.The paleolatitude of this region remained at 35° to 37°S from the Berriasian through the Aptian. During this interval, there was approximately 16° of clockwise rotation, with the oriented sample suites of Site 765 displaying a Berriasian declination of 307° to an Aptian declination of 323°. These results are consistent with the interpolated Early Cretaceous apparent polar wander for Australia, but indicate that this region was approximately 5° farther north than predicted.

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Section: Rotation Of Sitesmentioning

confidence: 97%

Section: Polarity Interpretations Characteristic Directions and Ratmentioning

confidence: 99%

Section: Comparison To Australian Polar Wander Pathmentioning

confidence: 99%

Section: Comparison To Australian Polar Wander Pathmentioning

confidence: 99%

Section: Magnetostratigraphy and Assignment Of Polarity Chronsmentioning

confidence: 99%

See 3 more Smart Citations

Lower Cretaceous Magnetostratigraphy and Paleolatitudes off Northwest Australia, ODP Site 765 and DSDP Site 261, Argo Abyssal Plain, and ODP Site 766, Gascoyne Abyssal Plain

Ogg¹,

Kodama²,

Wallick³

1992

Proceedings of the Ocean Drilling Program

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Palaeozoic drift of Gondwana: Palaeomagnetic and stratigraphic constraints

Houten

Hargraves

1987

Geol. J.

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Currently available Palaeozoic palaeomagnctic data from Gondwanan continents can he interpreted in terms of either (a) a migration of the pole from northern Africa to southern Africa between Ordovician and late Palaeozoic times, or (b) a rapid excursion of the pole from northern Africa to southwest of South Africa during late Ordovician to early Silurian times, followed by a return to central Africa in late Devonian times, t h e r c a k r continuing southward again. With respect to this uncertainty, pertinent stratigraphical evidence from western Gondwana includes the distribution of glacial deposits and cold-water and warm-water faunas. This record, although meagre and to some extent contradictory, appears to favour a drift history consistent with the second (b) o f the APW alternatives that involves a rapid southerly excursion of the pole by early Silurian times.

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References

Borradaile¹

2003

Statistics of Earth Science Data

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A review of the paleomagnetism of Australia and Antarctica

Cited by 52 publications

References 86 publications

Lower Cretaceous Magnetostratigraphy and Paleolatitudes off Northwest Australia, ODP Site 765 and DSDP Site 261, Argo Abyssal Plain, and ODP Site 766, Gascoyne Abyssal Plain

Lower Cretaceous Magnetostratigraphy and Paleolatitudes off Northwest Australia, ODP Site 765 and DSDP Site 261, Argo Abyssal Plain, and ODP Site 766, Gascoyne Abyssal Plain

Palaeozoic drift of Gondwana: Palaeomagnetic and stratigraphic constraints

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