Metamorphic and geochronological evolution of the Kemp and MacRobertson Land coast, east Antarctica ...
Rocks of the Kemp and MacRobertson Land coastline, east Antarctica, expose a semi-continuous profile through the middle- to lower-crustal sections of a Neoproterozoic convergent orogen called the Rayner Complex. Kemp Land exposures are dominated by Archaean felsic orthogneiss interpreted to represen...
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| Format: | Thesis |
| Language: | unknown |
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University Of Tasmania
2023
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| Online Access: | https://dx.doi.org/10.25959/23248235.v1 https://figshare.utas.edu.au/articles/thesis/Metamorphic_and_geochronological_evolution_of_the_Kemp_and_MacRobertson_Land_coast_east_Antarctica/23248235/1 |
| Summary: | Rocks of the Kemp and MacRobertson Land coastline, east Antarctica, expose a semi-continuous profile through the middle- to lower-crustal sections of a Neoproterozoic convergent orogen called the Rayner Complex. Kemp Land exposures are dominated by Archaean felsic orthogneiss interpreted to represent the tectonically reworked margin of a continental fragment called the Napier Complex, whereas MacRobertson Land exposures are dominated by supracrustal successions of probable Proterozoic age and voluminous felsic plutonic rocks. All of these rocks were deformed and metamorphosed at granulite facies conditions during the ca. 1000 ‚Äö- 900 Ma Rayner Structural Episode, which was a consequence of the convergence of crustal blocks that now constitute extensive parts of eastern India and east Antarctica, and formed part of the supercontinent called Rodinia. This thesis examines the geochronological, metamorphic and structural evolution of the Kemp and MacRobertson Land rocks and focuses on two main themes: (1) the ... |
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