Charles Mountains (East Antarctica)
Summary Shaw massif is situated in the central part of the Prince Charles Mountains and represents a complex with complicated fold structure and compositions that include biotite leucogneisses, garnet-biotite gneisses and plagiogneises (Lambert gneisses); amphibole-biotite melanogneisses, garnet-bio...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.561.9274 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea124.pdf |
| Summary: | Summary Shaw massif is situated in the central part of the Prince Charles Mountains and represents a complex with complicated fold structure and compositions that include biotite leucogneisses, garnet-biotite gneisses and plagiogneises (Lambert gneisses); amphibole-biotite melanogneisses, garnet-biotite plagiogneisses (Shaw melanogneisses). Also, there are poorly developed garnet-sillimanite-biotite gneisses (Isabelle paragneisses) which are met in the form of xenolith bodies among the Lambert gneisses and could be the fragments of the ancient sedimentary layer. The obtained U-Pb data reflect the two main geological events with ages 900-1100 Ma and 450-550 Ma corresponding to Rayner and Pan-African tectonothermal events. The Shaw Massif terrane has been affected by at least 5 deformation events and three stages of metamorphic reworking. The structural geological position of the Shaw Massif region could be interpreted as a younger, high grade metamorphic region framing the Fisher Province. |
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