Early Cretaceous dextral transpressional deformation within the Median Batholith, Stewart Island, New Zealand
| Autor: | A. H. Allibone, Andy J. Tulloch |
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| Rok vydání: | 2008 |
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| Zdroj: | New Zealand Journal of Geology and Geophysics. 51:115-134 |
| ISSN: | 1175-8791 0028-8306 |
| Popis: | The character, timing, and significance of deformation within the Median Batholith has been debated since at least 1967, with allochthonous and autochthonous models proposed to account for internal variations in the character of the batholith. Stewart Island provides excellent exposures of intrabatholithic structures, allowing many aspects of the deformation history within the batholith to be analysed, far removed from the effects of later deformation related to the current plate boundary. Median Batholith rocks in northern and central Stewart Island are deformed by three major structures: the Freshwater Fault System, Escarpment Fault, and Gutter Shear Zone. Lineation orientations, Al in hornblende geobarometry, and Ar‐Ar thermochronology indicate up to c. 7 km of NNE‐directed uplift of the hanging wall of the Escarpment Fault between c. 110 and 105 Ma. Unlike the Escarpment Fault, a wide range of mineral elongation lineation orientations, including many oblique to the strike and dip of related f... |
| Databáze: | OpenAIRE |
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