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Article << Previous     |         Contents Vol 43(4)

Late Cambrian palaeomagnetic data from the Cupala Creek Formation, western New South Wales, Australia

Christian Vérard

Ludwig–Maximillians–Universität, Geophysics Department, Theresienstraße 40, 80 333 München, Germany. Current address: Université de Lausanne, Institut de Geologie & Paléontologie, Quartier Dorigny, 1015 Lausanne, Switzerland. Email: christian.verard@unil.ch

Exploration Geophysics 43(4) 283-294 http://dx.doi.org/10.1071/EG11052
Submitted: 3 December 2011  Accepted: 3 July 2012   Published: 9 August 2012


 
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Abstract

The Tasmanides of south-eastern Australia comprises the Delamerian Orogen, considered to be stable relative to the craton of Gondwana since the mid Cambrian, despite the presence of the Grasmere Knee Zone, a change of structural trends in the Broken Hill area. A palaeomagnetic study has been carried out on the Late Cambrian red sandstones of the Cupala Creek Formation, a post-Delamerian formation gently folded in the latest Ordovician–Early Silurian and/or Early Devonian. Anisotropy of magnetic susceptibility (AMS) measurements show that internal strain is negligible and low Königsberger ratios indicate that lightning effects can be discarded. The magnetisation observed is complex with four components, which are sometimes difficult to isolate clearly. The orientation of the first component corresponds to the present-day field and appears to be associated with weathering effects. The second component (~185°-350°C) is of reverse polarity relative to the third (350°-575°C). These two components are interpreted to represent a chemical remagnetisation, which lasted long enough to record a reversal as the reversal test is positive and classified C. The overprint must be Early Palaeozoic in age. The last component is carried by haematite and/or maghaemite and is believed to be primary, which is supported by the positive ‘pseudo-unconformity’ test with the underlying Early–Middle Cambrian Teltawongee beds, and by the good correspondence of the pole [PLong. 351.3°/PLat.+33.9° (dp = 3.6°; dm = 6.0°); African coordinates] with other poles of the same age for Gondwana. Despite the presence of the Grasmere Knee Zone, these results imply that this area of the Delamerian Orogen did not record any movement or rotation since the Late Cambrian and can be considered as part of the craton of Gondwana.

Key words: APW path of Gondwana, Cupala Creek Formation, Delamerian Orogen, Late Cambrian, New South Wales, palaeomagnetism, Tasmanides.


References

Bachtadse, V., and Briden, J., 1990, Paleomagnetic constraints on the position of Gondwana during Ordovician to Devonian times, in W. McKerrow, and C. Scotese, eds., Palaeozoic palaeogeography and biogeography, Geological Society Memoir, 12, 43–48.

Bachtadse, V., and Briden, J., 1991, Palaeomagnetism of Devonian ring complexes from the Bayuda Desert – new constraints on the Apparent Polar Wander path for Gondwanaland: Geophysical Journal International, 104, 635–646
CrossRef |

Clark, D., and Lackie, M., 2003, Palaeomagnetism of the Early Permian Mount Leyshon Intrusive Complex and Tuckers Igneous Complex, North Queensland, Australia: Geophysical Journal International, 153, 523–547
CrossRef |

Crawford, A., Stevens, B., and Fanning, M., 1997, Geochemistry and tectonic setting of some Neoproterozoic and Early Cambrian volcanics in western New South Wales: Australian Journal of Earth Sciences, 44, 831–852
CrossRef | CAS |

Embleton, B., McEhlinny, M., Crawford, A., and Luck, G., 1974, Palaeomagnetism and the tectonic evolution of the Tasman Orogenic Zone: Journal of the Geological Society of Australia, 21, 187–194

Flinn, D., 1962, On folding during three dimensional progressive deformation: Quarterly Journal of the Geological Society of London, 118, 385–428
CrossRef |

Flinn, D., 1965a, On the symmetry principle and the deformation ellipsoid: Geological Magazine, 102, 36–45
CrossRef |

Flinn, D., 1965b, Deformation in metamorphism, in W. S. Pitcher, and G. W. Flinn, eds., Controls of metamorphism: Oliver & Boyd, 46–72.

Glen, R., 1992, Thrust, extensional and strike-slip tectonics in an evolving Palaeozoic orogen: a structural synthesis of the Lachlan Orogen of southeastern Australia, in C. Fergusson, and R. Glen, eds., The Palaeozoic Eastern Margin of Gondwanaland: tectonics of the Lachlan Fold Belt, southeastern Australia and related orogens: Tectonophysics, 214, 341–380.

Gray, D., Foster, D., and Bucher, M., 1997, Recognition and definition of orogenic events in the Lachlan Fold Belt: Australian Journal of Earth Sciences, 44, 489–501
CrossRef | CAS |

Greenfield, J., Gilmore, P., and Mills, K., 2010, Explanatory notes for the Koonenberry Belt geological maps. Geological Survey of New South Wales Bulletin, 35, 498 pages.

Grunow, A., 1999, Gondwana events and palaeogeography: a palaeomagnetic review: Journal of African Earth Sciences, 28, 53–69
CrossRef |

Jelinek, V., 1981, Characterization of the magnetic fabric of rocks: Tectonophysics, 79, T63–T67
CrossRef |

Kent, D., and Van der Voo, R., 1990, Palaeozoic palaeogeography from palaeomagnetism of the Atlantic-bordering continents, in W. McKerrow, and C. Scotese, eds., Palaeozoic palaeogeography and biogeography, Geological Society Memoir, 12, 49–56.

Kirschvink, J., 1978, The Precambrian – Cambrian boundary problem: paleomagnetic directions from the Amadeus Basin, Central Australia: Earth and Planetary Science Letters, 40, 91–100
CrossRef |

Königsberger, J., 1938, Natural residual magnetism in eruptive rocks: Terrestrial Magnetism and Atmospheric Electricity, 43, 119–130
CrossRef |

Lawver, L., and Scotese, C., 1987, A revised reconstruction of Gondwanaland, in G. McKenzie, ed., Gondwana Six: structure, tectonics and geophysics: American Geophysical Union, Geophysical Monograph, 40, 17–23.

Leitch, E., and Scheibner, E., 1987, Stratotectonic terranes of the eastern Australian Tasmanides, in XX Leitch, and XX Scheibner, eds., Terrane accretion and orogenic belts: American Geophysical Union, Geodynamic Series 19, 1–19.

Leonhardt, R., 2006, Analysing rock magnetic measurements: the Roc kmag Analyser 1.0 software: Computers & Geosciences, 32, 1420–1431
CrossRef |

Li, Z.-X., and Powell, C., 2001, An outline of the palaeogeographic evolution of the Australasian region since the beginning of the Neoproterozoic: Earth-Science Reviews, 53, 237–277
CrossRef |

Livermore, R., Smith, A., and Briden, J., 1985, Palaeomagnetic constraints on the distribution of continents in the Late Silurian and Early Devonian: Philosophical Transactions of the Royal Society Series B, 309, 29–56
CrossRef |

McElhinny, M., and Embleton, B., 1974, Australian palaeomagnetism and the Phanerozoic plate tectonics of eastern Gondwanaland: Tectonophysics, 22, 1–29
CrossRef |

McElhinny, M., and Lock, J., 1996, I.A.G.A. palaeomagnetic databases with access (Version 4.4, 2003, maintained by Pisarevsky): Surveys in Geophysics, 17, 575–591
CrossRef |

McElhinny, M., Powell, C., and Pisarevsky, S., 2003, Paleozoic terranes of eastern Australia and the drift history of Gondwana: Tectonophysics, 362, 41–65
CrossRef |

McFadden, P., and McElhinny, M., 1988, The combined analysis of remagnetization circles and direct observations in palaeomagnetism: Earth and Planetary Science Letters, 87, 161–172
CrossRef |

McFadden, P., and McElhinny, M., 1990, Classification of the reversal test in palaeomagnetism: Geophysical Journal International, 103, 725–729
CrossRef |

Morel, P., and Irving, E., 1978, Tentative paleocontinental maps for the Early Phanerozoic and Proterozoic: The Journal of Geology, 86, 535–561
CrossRef |

Perroud, H., Van der Voo, R., and Bonhommet, N., 1984, Paleozoic evolution of the Armorica plate on the basis of paleomagnetic data: Geology, 12, 579–582
CrossRef |

Powell, C., Li, Z.-X., Thrupp, G., and Schmidt, P., 1990, Australian Palaeozoic palaeomagnetism and tectonics, tectonostratigraphic terrane constraints from the Tasman Fold Belt, in A. E. Grady et al., eds., Australian tectonics: Journal of Structural Geology, 12, 553–565.

Schmidt, P., Powell, C., Li, Z.-X., and Thrupp, G., 1990, Reliability of Palaeozoic palaeomagnetic poles and APWP of Gondwanaland, in P. Schmidt, and R. Van der Voo, eds., Reliability of palaeomagnetic data: Tectonophysics, 184, 87–100.

Scotese, C., Van der Voo, R., and Barrett, S., 1985, Silurian and Devonian base maps: Philosophical Transactions of the Royal Society Series B, 309, 57–77
CrossRef |

Smith, A., 1999, Gondwana: its shape, size and position from Cambrian to Triassic times: Journal of African Earth Sciences, 28, 71–97
CrossRef |

Stevens, B., Mills, K., Direen, N., and Cooper, I., 2002, Bancannia 7236 - Wonnaminta 7336 - Kayrunnera 7436 1 : 100 000 geological sheet. Koonenberry Pre-Permian Interpretation map, Geological Survey of New South Wales, 1v, map.

Torsvik, T., and Van der Voo, R., 2002, Refining Gondwana and Pangea palaeogeography: estimates of Phanerozoic non-dipole (octupole) fields: Geophysical Journal International, 151, 771–794
CrossRef |

Van der Voo, R., 1990, The reliability of palaeomagnetic data: Tectonophysics, 184, 1–9
CrossRef |

Veevers, J., 1984, ed., Phanerozoic earth history of Australia: Clarendon Press.

Vérard, C., 2004, Palaeozoic palaeomagnetism of south-eastern Australia: implications for the APW path of Gondwana: Ph.D. thesis, Ludwig-Maximilians-Universität München, Germany.

Vérard, C., 2009, Palaeomagnetic study of the Late Silurian–Early Devonian Mt Daubeny Formation from the Broken Hill area, New South Wales: Australian Journal of Earth Sciences, 56, 687–710
CrossRef |

Willman, C, Van den Berg, A, and Morand, V, 2002, Evolution of the south-eastern Lachlan Fold Belt in Victoria: Australian Journal of Earth Sciences, 49, 271–289
CrossRef |

Zijderveld, J., 1967, A.C. demagnetisation of rocks, in D. W. Collinson, K. M. Creer, and S. K. Runcorn, eds., Methods in palaeomagnetism: Elsevier Science, 254–286.


   
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