Paleomagnetic and geochronological study of carboniferous forearc basin rocks in the Southern New England orogen (Eastern Australia)

Pisarevsky, Sergei A., Rosenbaum, Gideon, Shaanan, Uri, Hoy, Derek, Speranza, Fabio and Mochales, Tania (2016) Paleomagnetic and geochronological study of carboniferous forearc basin rocks in the Southern New England orogen (Eastern Australia). Tectonophysics, 681 263-277. doi:10.1016/j.tecto.2016.01.029


Author Pisarevsky, Sergei A.
Rosenbaum, Gideon
Shaanan, Uri
Hoy, Derek
Speranza, Fabio
Mochales, Tania
Title Paleomagnetic and geochronological study of carboniferous forearc basin rocks in the Southern New England orogen (Eastern Australia)
Journal name Tectonophysics   Check publisher's open access policy
ISSN 0040-1951
Publication date 2016-06-20
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.tecto.2016.01.029
Open Access Status Not Open Access
Volume 681
Start page 263
End page 277
Total pages 46
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
We present results of a paleomagnetic study from Carboniferous forearc basin rocks that occur at both limbs of the Texas Orocline (New England Orogen, eastern Australia). Using thermal and alternating field demagnetizations, two remanence components have been isolated from rocks sampled from the Emu Creek terrane, in the eastern limb of the orocline. A middle-temperature Component M is post-folding and was likely acquired during low-temperature oxidation at 65–35 Ma. A high-temperature Component H is pre-folding, but its comparison with the paleomagnetic data from coeval rocks in the northern Tamworth terrane on the other limb of Texas Orocline does not indicate rotations around a vertical axis, as expected from geological data. A likely explanation for this apparent discrepancy is that Component H postdates the oroclinal bending, but predates folding in late stages of the 265–230 Ma Hunter Bowen Orogeny. The post-Kiaman age of Component H is supported by the presence of an alternating paleomagnetic polarity in the studied rocks. A paleomagnetic study of volcanic and volcaniclastic rocks in the Boomi Creek area (northern Tamworth terrane) revealed a stable high-temperature pre-folding characteristic remanence, which is dated to c. 318 Ma using U–Pb zircon geochronology. The new paleopole (37.8°S, 182.7°E, A95 = 16.2°) is consistent with previously published poles from coeval rocks from the northern Tamworth terrane. The combination of our new paleomagnetic and geochronological data with previously published results allows us to develop a revised kinematic model of the New England Orogen from 340 Ma to 270 Ma, which compared to the previous model, incorporates a different orientation of the northern Tamworth terrane at 340 Ma.
Keyword New England oroclines
Carboniferous
Paleomagnetism
Geochronology
Gondwana
Kiaman Superchron
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
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Created: Thu, 04 Feb 2016, 04:59:00 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences