The Late Devonian paleomagnetic field for southeastern Australia: A new result for the Lochiel Formation and a reassessment of results from the Catombal Group

Embleton, B. J. J.; Shepherd, J. B.

doi:10.1029/jb082i033p05423

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Since the pioneer work by Irving (1956), numerous paleomagnetic studies were conducted in Australia on the Precambrian (e.g., Porath, 1967;Giddings, 1976;Embleton, 1978), the Paleozoic (e.g., Irving, 1966;Luck, 1973;Embleton and Shepherd, 1977), the Mesozoic (e.g., Robertson, 1963;Schmidt, 1976;Embleton and Schmidt, 1977), and the Cenozoic (e.g., Wellman et al, 1969;McElhinny et al, 1974;Idnurm, 1985). The whole Paleozoic to Cenozoic apparent polar wander path (APWP) for Australia was reviewed by Embleton (1981Embleton ( , 1984.…”

Section: Previous Studies Of Australian Polar Wander Pathmentioning

confidence: 99%

Motion of the Australian Plate from Sediment Paleoinclinations, Early Cretaceous through Holocene

Kodama¹,

Ogg²

1992

Proceedings of the Ocean Drilling Program

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The change in paleolatitude of the areas off northwestern Australia since the Early Cretaceous was determined from Paleomagnetism of cores from ODP Leg 123 (Sites 765 and 766) and DSDP Leg 27 (Site 261). The Early Cretaceous paleolatitudes determined for Sites 766 and 261 agree with each other, indicating an average paleolatitude of 37° ± 3°, which is slightly lower than expected from the Australian apparent polar wander path (APWP). The Early Cretaceous to Paleogene paleolatitudes for Site 765 are systematically lower than those predicted by the Australian apparent polar wander path. In particular, the disagreement between these data and predictions for the mid-to-Late Cretaceous is in excess of 15°. INTRODUCTIONLeg 123 of the Ocean Drilling Program was undertaken in the Argo and Gascoyne abyssal plains in the eastern Indian Ocean, which lie between the Java Trench to the north and the northwestern margin of Australia to the south (Fig. 1). Analyses of marine magnetic anomalies (Larson, 1975;Heirtzler et al., 1978;Fullerton et al., 1989) and previous drilling of DSDP Leg 27 in the Argo Abyssal Plain (Veevers, Heirtzler, et al., 1974) suggested that the basins off northwestern Australia are among the oldest in the Indian Ocean, with an age for the oldest portion of Oxfordian to Kimmeridgian (150-160 Ma). Although DSDP Site 261 in the Argo Abyssal Plain (12.9°S, 117.9°E) was penetrated down to basaltic basement, the recovery of sediment cores was poor (20% on average), and the paleontological age of the basalt/sediment contact was not well constrained as Hauterivian-Valanginian to upper Oxfordian (Veevers, Heirtzler, et al., 1974).Thus, the primary objectives of Leg 123 were (1) to recover a complete sedimentary section from the Late Jurassic to Holocene for elucidating the tectonic and paleoceanographic development of the Indian Ocean, (2) to improve the Late Jurassic to Early Cretaceous magnetobiostratigraphy for the Southern Hemisphere by correlating to the magnetic polarity time scale, as compiled from the Pacific and Atlantic-Tethys regions, and (3) to investigate the geochemistry and petrology of the oldest oceanic basement formed at the initial break-up of Gondwanaland. Site 765 of Leg 123 thus was placed near the ocean/continent boundary of the Argo Abyssal Plain and the Exmouth Plateau (16.0°S, 117.6°E; 5730 mbsf), where a Late Jurassic marine magnetic anomaly lineation identified as Chron M25 (late Oxfordian) by Fullerton et al. (1989) trends in an east-northeast to west-southwest direction (Fig. 2). Site 766 was located at the foot of the western Exmouth Plateau (19.9°S, 110.5°E; 4008 mbsf), about 10 km southeastward from Chron M10 of Fullerton et al. (1989). Thick sequences of Lower Cretaceous to Holocene strata, together with basaltic basement, were recovered at both sites. No Jurassic sediment, however, has been recognized from Site 765, the basal age of which was late Berriasian, while the age of the sediment/basalt Gradstein, F. M., Ludden, J. N., et al., 1992. Proc. ODP, Sci. Results, 123...

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Section: Previous Studies Of Australian Polar Wander Pathmentioning

confidence: 99%

Motion of the Australian Plate from Sediment Paleoinclinations, Early Cretaceous through Holocene

Kodama¹,

Ogg²

1992

Proceedings of the Ocean Drilling Program

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Paleomagnetic study of Siluro‐Devonian volcanic rocks from the central Lachlan Orogen: Implications for the apparent pole wander path of Gondwana

2005

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The apparent pole wander (APW) path for Gondwana is still not clearly established, in particular, for Silurian‐Devonian times. A controversial debate places authors who argue for an “X path,” running directly through Africa on a reconstruction of Gondwana against those who advocate a large loop passing by southern South America, the “Y path.” Most of the paleomagnetic data used to draw this loop come from the Lachlan Orogen (Australia). A paleomagnetic study was carried out in the well‐dated Ambone and Ural volcanics in the central subprovince of Lachlan Orogen, New South Wales. Anisotropy of magnetic susceptibility measurements confirms detailed mapping of the region and shows that these massive dacitic sills and/or lava flows are flat lying. Among the different localities studied, only one yields interpretable paleomagnetic results. Two components of magnetization can be identified: a midtemperature direction yielding a corresponding pole in Australian coordinates λ = 67.9°S/ϕ = 084.4°E (B = 5; n = 21; dp = 17.5°/dm = 23.1°) and a high‐temperature direction with a corresponding VGP λ = 24.4°S/ϕ = 060.6°E (B = 5; n = 25; dp = 1.4°/dm = 2.5°). The first is interpreted as corresponding to an Early Carboniferous pole position and can be regarded as an overprint probably related to the Early Carboniferous Kanimblan orogenic event. The second does not correspond to any expected Silurian‐Devonian or younger pole position. This magnetization is thought to be primary in origin; however, secular variation has apparently not been averaged out in the single lava flow sampled. Therefore the earliest Devonian paleopole position probably lies in a 30° cone around the obtained VGP, and this position can only match the X‐type APW path for Gondwana. It is in particular very different from coeval poles obtained in the eastern subprovince of the Lachlan Orogen, and it is mostly used as key poles supporting the Silurian‐Devonian loop for the APW path of Gondwana. Therefore some poles from the Lachlan Orogen must be affected by rotation to explain these results. The Lachlan Orogen was hence not stable up to the mid‐Paleozoic, and data from this region should not be used as representative for Gondwana.

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A review of the paleomagnetism of Australia and Antarctica

Embleton

1981

Paleoreconstruction of the Continents

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The Late Devonian paleomagnetic field for southeastern Australia: A new result for the Lochiel Formation and a reassessment of results from the Catombal Group

Cited by 4 publications

References 12 publications

Motion of the Australian Plate from Sediment Paleoinclinations, Early Cretaceous through Holocene

Motion of the Australian Plate from Sediment Paleoinclinations, Early Cretaceous through Holocene

Paleomagnetic study of Siluro‐Devonian volcanic rocks from the central Lachlan Orogen: Implications for the apparent pole wander path of Gondwana

A review of the paleomagnetism of Australia and Antarctica

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