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| Titel: |
Alice Springs age shear zones from the southeastern Reynolds Range, central Australia |
| Auteur: |
Cartwright, I. Buick, I. S. Foster, D. A. Lambert, D. D. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 46 (1999) nr. 3 pagina's 355-363 |
| Jaar: |
1999-06 |
| Inhoud: |
The southeast Reynolds Range, central Australia, is cut by steep northwest-trending shear zones that are up to hundreds of metres wide and several kilometres long. Amphibolite-facies shear zones cut metapelites, while greenschist-facies shear zones cut metagranites. Rb-Sr and 40Ar-39Ar data suggest that both sets of shear zones formed in the 400-300 Ma Alice Springs Orogeny, with the sheared granites yielding well-constrained 40Ar-39Ar ages of ca 334 Ma. These data imply that the shear zones represent a distinct tectonic episode in this terrain, and were not formed during cooling from the ca 1.6 Ga regional metamorphism. A general correlation between regional metamorphic grade and the grade of Alice Springs structures implies a similar distribution of heat sources for the two events. This may be most consistent with both phases of metamorphism being caused by the burial of anomalously radiogenic heat-producing granites. The sheared rocks commonly have undergone metasomatism implying that the shear zones were conduits of fluid flow during Alice Springs times. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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