Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation
Antarctica was at a centre position within Gondwana and holds a key position for any plate tectonic reconstruction related to its break-up history. North Victoria Land (NVL) is located at the Pacific end of the Transantarctic Mountains (TAM), which represent the uplifted western shoulder of the West...
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ftunivgenova:oai:iris.unige.it:11567/920168 2024-01-28T10:01:00+01:00 Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation Andreas Läufer Laura Crispini Frank Lisker Axel Gerdes Antonia Ruppel Läufer, Andrea Crispini, Laura Lisker, Frank Gerdes, Axel Ruppel, Antonia 2018 ELETTRONICO http://hdl.handle.net/11567/920168 eng eng country:CHE info:eu-repo/semantics/altIdentifier/isbn/978-0-948277-54-2 ispartofbook:POLAR2018 - Abstract Proceedings POLAR2018-Where the Poles come together- SCAR/IASC Open Science Conference firstpage:1936 lastpage:1936 numberofpages:1 http://hdl.handle.net/11567/920168 info:eu-repo/semantics/conferenceObject 2018 ftunivgenova 2024-01-03T17:54:51Z Antarctica was at a centre position within Gondwana and holds a key position for any plate tectonic reconstruction related to its break-up history. North Victoria Land (NVL) is located at the Pacific end of the Transantarctic Mountains (TAM), which represent the uplifted western shoulder of the West Antarctic Rift System. The basement of the TAM formed during subduction of the Palaeopacific Ocean under E Gondwana during the Ross Orogeny. Major uplift of the TAM commenced around the Eocene-Oligocene boundary following sediment accumulation within the wide “Mesozoic Victoria Basin”. This long-lasting geological history led to highly anisotropic crust that is susceptible to repeated reactivation. We present evidence for a polyphase structural evolution of NVL after initial break-up of Gondwana at ca. 180 Ma coeval with the Ferrar volcanic event. Mainly Neogene NW-SE striking dextral strike-slip tectonics with local transtension and transpression controls the present structural architecture of NVL. It may be interpreted as dynamic response to intra-oceanic fracture zones between Australia and Antarctica extending into NVL and the Ross Sea. Dextral strike-slip overprints two older increments: (i) WNW-ESE striking sinistral tectonics of possibly late Mesozoic-early Paleogene age within a transform margin setting between Australia and Antarctica, (ii) ENE-WSW directed extension of NVL continental crust possibly coeval to Adare Trough spreading in Eocene-Oligocene times. Conference Object Antarc* Antarctic Antarctica Ross Sea Victoria Land Università degli Studi di Genova: CINECA IRIS Antarctic Ross Sea Victoria Land Transantarctic Mountains Pacific Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Adare Trough ENVELOPE(172.500,172.500,-70.033,-70.033) |
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Open Polar |
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Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
description |
Antarctica was at a centre position within Gondwana and holds a key position for any plate tectonic reconstruction related to its break-up history. North Victoria Land (NVL) is located at the Pacific end of the Transantarctic Mountains (TAM), which represent the uplifted western shoulder of the West Antarctic Rift System. The basement of the TAM formed during subduction of the Palaeopacific Ocean under E Gondwana during the Ross Orogeny. Major uplift of the TAM commenced around the Eocene-Oligocene boundary following sediment accumulation within the wide “Mesozoic Victoria Basin”. This long-lasting geological history led to highly anisotropic crust that is susceptible to repeated reactivation. We present evidence for a polyphase structural evolution of NVL after initial break-up of Gondwana at ca. 180 Ma coeval with the Ferrar volcanic event. Mainly Neogene NW-SE striking dextral strike-slip tectonics with local transtension and transpression controls the present structural architecture of NVL. It may be interpreted as dynamic response to intra-oceanic fracture zones between Australia and Antarctica extending into NVL and the Ross Sea. Dextral strike-slip overprints two older increments: (i) WNW-ESE striking sinistral tectonics of possibly late Mesozoic-early Paleogene age within a transform margin setting between Australia and Antarctica, (ii) ENE-WSW directed extension of NVL continental crust possibly coeval to Adare Trough spreading in Eocene-Oligocene times. |
author2 |
Läufer, Andrea Crispini, Laura Lisker, Frank Gerdes, Axel Ruppel, Antonia |
format |
Conference Object |
author |
Andreas Läufer Laura Crispini Frank Lisker Axel Gerdes Antonia Ruppel |
spellingShingle |
Andreas Läufer Laura Crispini Frank Lisker Axel Gerdes Antonia Ruppel Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation |
author_facet |
Andreas Läufer Laura Crispini Frank Lisker Axel Gerdes Antonia Ruppel |
author_sort |
Andreas Läufer |
title |
Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation |
title_short |
Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation |
title_full |
Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation |
title_fullStr |
Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation |
title_full_unstemmed |
Polyphase Brittle Tectonics in North Victoria Land and Gondwana Fragmentation |
title_sort |
polyphase brittle tectonics in north victoria land and gondwana fragmentation |
publisher |
country:CHE |
publishDate |
2018 |
url |
http://hdl.handle.net/11567/920168 |
long_lat |
ENVELOPE(170.233,170.233,-71.283,-71.283) ENVELOPE(172.500,172.500,-70.033,-70.033) |
geographic |
Antarctic Ross Sea Victoria Land Transantarctic Mountains Pacific Adare Adare Trough |
geographic_facet |
Antarctic Ross Sea Victoria Land Transantarctic Mountains Pacific Adare Adare Trough |
genre |
Antarc* Antarctic Antarctica Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/isbn/978-0-948277-54-2 ispartofbook:POLAR2018 - Abstract Proceedings POLAR2018-Where the Poles come together- SCAR/IASC Open Science Conference firstpage:1936 lastpage:1936 numberofpages:1 http://hdl.handle.net/11567/920168 |
_version_ |
1789325674841899008 |