Journal article
Metamorphism and deformation of an Early Permian extensional basin sequence: The Manning Group, southern New England Orogen
Australian Journal of Earth Sciences , Vol.43(4), pp.423-435
1996
Abstract
The Manning Group is a deformed Early Permian extensional sedimentary basin sequence cropping out in the southern New England Orogen. Peak metamorphism occurred during burial, with zeolite facies succeeded by prehnite‐pumpellyite facies assemblages at greater depth. Temperatures ranged from 160 to 260°C according to vitrinite reflectance (Ro) and chlorite geothermometric studies. Limited Ro‐depth data indicate a geothermal gradient of ∼24°C/km, suggesting that ∼10 km of Early Permian sedimentary rocks existed prior to erosion and that the Manning Group is ∼4 km thick. Two deformation events are recognised in the Manning Group. D1 was caused by east‐west compression and produced meridional folds and thrusting. East‐west compression was also operative during D2. At this time σ3 changed from vertical to horizontal, which resulted in rotation of the meridional structures into a southeast trend during sinistral movement on the Manning Fault System and the formation of cleavage in adjacent high‐strain zones. It is suggested that extension was accomplished by movement on a detachment fault.
Details
- Title
- Metamorphism and deformation of an Early Permian extensional basin sequence: The Manning Group, southern New England Orogen
- Authors
- R. B Jenkins (Author) - Sunshine Coast University College (Legacy)R Offler (Author) - University of Newcastle Australia
- Publication details
- Australian Journal of Earth Sciences , Vol.43(4), pp.423-435
- Publisher
- Taylor & Francis
- DOI
- 10.1080/08120099608728265
- ISSN
- 1440-0952
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99523405002621
- Output Type
- Journal article
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