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Paleomagnetism of the Newcastle Range, northern Queensland: Eastern Gondwana in the Late Paleozoic

Anderson, K. L., M. A. Lackie, D. A. Clark, and P. W. Schmidt (2003), Paleomagnetism of the Newcastle Range, northern Queensland: Eastern Gondwana in the Late Paleozoic, J. Geophys. Res. - Solid Earth, 108(B6).

Abstract
[1] The Newcastle Range is an extensive (2500 km(2)) and well-exposed caldera system erupted on the trailing edge of Eastern Gondwana between 325 and 295 Ma. Paleomagnetic samples were collected from ignimbrites and associated microgranitoid intrusions from the central, northern and southern calderas from which three components of magnetization are recognized. Component 1 is considered to be a viscous magnetization acquired during the Brunhes Chron. A presumed Permian component, C2, is found in seven paleomagnetic sites with a mean pole at 30.9degreesS, 139.7degreesE (K = 13.9, A95 = 16.8degrees, ASD = 21.7degrees), agreeing with previously reported Permian data from Australia. Carboniferous units have a well-defined characteristic component, C3, distinguished by dual polarity (predominantly reversed) and moderate to steep inclination directions. Paleomagnetic polarities in the Newcastle Range Volcanics are formation dependent and new constraints on the timing of Carboniferous volcanism (similar to325-317 Ma) are consistent with recent reanalysis of the base of the Permo-Carboniferous Reversed Superchron (PCRS). A mean paleomagnetic pole, calculated from 15 VGPs, lies at 63.4degreesS, 125degreesE (K = 26.22, A95 = 7.6degrees, ASD = 15.8degrees), suggesting that Australia remained at midlatitudes into the Middle Carboniferous. This paleomagnetic pole is consistent with similarly aged poles from Western Gondwana, the conformity of which indicates contributions from nondipole components of the Earth's paleofield were probably not significant in the time immediately preceding the PCRS.
BibTeX
@article{id155,
  author = {K. L. Anderson and M. A. Lackie and D. A. Clark and P. W.  Schmidt},
  journal = {J. Geophys. Res. - Solid Earth},
  number = {B6},
  title = {{Paleomagnetism of the Newcastle Range, northern Queensland: Eastern Gondwana in the Late Paleozoic}},
  volume = {108},
  year = {2003},
  language = {en},
}
EndNote
%0 Journal Article
%A Anderson, K. L.
%A Lackie, M. A.
%A Clark, D. A.
%A Schmidt, P. W. 
%D 2003
%N B6
%V 108
%J J. Geophys. Res. - Solid Earth
%T Paleomagnetism of the Newcastle Range, northern Queensland: Eastern Gondwana in the Late Paleozoic
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Printed 23. Oct 2020 07:43