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Details van artikel 6 van 11 gevonden artikelen
| Titel: |
Metamorphism and deformation of an Early Permian extensional basin sequence: The Manning Group, southern New England Orogen |
| Auteur: |
Jenkins, R. B. Offler, R. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 43 (1996) nr. 4 pagina's 423-435 |
| Jaar: |
1996-08 |
| Inhoud: |
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. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 11 gevonden artikelen
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