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Details van artikel 5 van 16 gevonden artikelen
| Titel: |
Early Proterozoic history of the Karari Fault Zone, northwest Gawler Craton, South Australia |
| Auteur: |
Rankin, L. R. Martin, A. R. Parker, A. J. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 36 (1989) nr. 1 pagina's 123-133 |
| Jaar: |
1989-03 |
| Inhoud: |
A 300 km-long linear aeromagnetic anomaly associated with the Karari Fault Zone defines a subvertical, Early Proterozoic, intracratonic shear zone within the Gawler Craton. The shear zone contains various mylonites and separates quartz + sapphirine-bearing granulites to the northwest from upper amphibolite facies gneisses to the southeast. The aeromagnetic anomaly is produced by magnetite-rich metasediments (iron formation), semi-pelitic gneisses and thin pegmaties which have become interlayered on all scales during deformation. All have undergone intense non-coaxial strain with development of both Type I and Type II S-C proto- to ultra-mylonite fabrics. Kinematic indicators, including asymmetrical megacryst tails, elongation lineations, vergence relationships of S-C foliations, and mica 'fish' indicate downthrow of the northwestern block with a sinistral strike-slip component. The shear zone represents a major zone of crustal weakness which has remained intermittently active until the Tertiary. Earlier, perhaps Archaean, upthrusting of the northwestern block is suggested. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 16 gevonden artikelen
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