Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway
On Varanger Peninsula, the roughly NW–SE-trending Trollfjorden–Komagelva Fault Zone separates Neoproterozoic successions that accumulated in a shallow-marine platformal domain to the SW of the fault from deepmarine basinal to deltaic sediments to the NE. In Ediacaran time the fault scarp acted as a...
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ftoslouniv:oai:www.duo.uio.no:10852/97459 2023-07-30T04:02:35+02:00 Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway ENEngelskEnglishDouble-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway Gabrielsen, Roy Helge Roberts, David Gjelsvik, Tone Sygnabere, Trond Olav Hassan, Muhammad Faleide, Jan Inge 2022-10-31T09:50:19Z http://hdl.handle.net/10852/97459 https://doi.org/10.1144/jgs2021-153 EN eng Gabrielsen, Roy Helge Roberts, David Gjelsvik, Tone Sygnabere, Trond Olav Hassan, Muhammad Faleide, Jan Inge . Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway. Journal of the Geological Society. 2022, 178 http://hdl.handle.net/10852/97459 2066577 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of the Geological Society&rft.volume=178&rft.spage=&rft.date=2022 Journal of the Geological Society 179 6 17 https://doi.org/10.1144/jgs2021-153 0016-7649 VDP::Marin geologi: 466 Journal article Tidsskriftartikkel Peer reviewed AcceptedVersion 2022 ftoslouniv https://doi.org/10.1144/jgs2021-153 2023-07-12T22:38:52Z On Varanger Peninsula, the roughly NW–SE-trending Trollfjorden–Komagelva Fault Zone separates Neoproterozoic successions that accumulated in a shallow-marine platformal domain to the SW of the fault from deepmarine basinal to deltaic sediments to the NE. In Ediacaran time the fault scarp acted as a buttress in a period of basinal inversion during the top-to-the-SW, contractional Timanian orogeny. During the subsequent, top-to-the-SE to -ESE, polyphase Caledonian orogenesis the fault acted as a dextral strike-slip megafracture and lateral ramp. In the northeastern terrane, Timanian and Caledonian fold interference has produced several examples of double-folding and intersecting cleavages. In the southwestern terrane, the Lower Allochthon Gaissa Thrust Belt overlies the Parautochthon, below which a 45 km long deformation front has been mapped. Tectonic shortening within this frontal zone varies from top-to-the-SSE in the west to topto-the-ESE in the east. Imbricate thrust sheets disrupt the succession in the northeastern terrane, below which a floor décollement is speculated to emerge as a frontal fault along a prominent footwall of the precursor fault that acted on the seabed in outermost Varangerfjorden. By use of potential field data, the Caledonian structures on Varanger can be followed to the north into the Barents Sea where the nappe pile in the pre-Carboniferous basement reaches a thickness of several kilometres. Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway Article in Journal/Newspaper Barents Sea Finnmark North Norway Varanger Varangerfjord* Varangerfjorden Finnmark Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Barents Sea Norway Buttress ENVELOPE(-57.083,-57.083,-63.550,-63.550) Varangerfjorden ENVELOPE(30.000,30.000,70.000,70.000) Komagelva ENVELOPE(30.528,30.528,70.241,70.241) Journal of the Geological Society 179 6 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
topic |
VDP::Marin geologi: 466 |
spellingShingle |
VDP::Marin geologi: 466 Gabrielsen, Roy Helge Roberts, David Gjelsvik, Tone Sygnabere, Trond Olav Hassan, Muhammad Faleide, Jan Inge Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway |
topic_facet |
VDP::Marin geologi: 466 |
description |
On Varanger Peninsula, the roughly NW–SE-trending Trollfjorden–Komagelva Fault Zone separates Neoproterozoic successions that accumulated in a shallow-marine platformal domain to the SW of the fault from deepmarine basinal to deltaic sediments to the NE. In Ediacaran time the fault scarp acted as a buttress in a period of basinal inversion during the top-to-the-SW, contractional Timanian orogeny. During the subsequent, top-to-the-SE to -ESE, polyphase Caledonian orogenesis the fault acted as a dextral strike-slip megafracture and lateral ramp. In the northeastern terrane, Timanian and Caledonian fold interference has produced several examples of double-folding and intersecting cleavages. In the southwestern terrane, the Lower Allochthon Gaissa Thrust Belt overlies the Parautochthon, below which a 45 km long deformation front has been mapped. Tectonic shortening within this frontal zone varies from top-to-the-SSE in the west to topto-the-ESE in the east. Imbricate thrust sheets disrupt the succession in the northeastern terrane, below which a floor décollement is speculated to emerge as a frontal fault along a prominent footwall of the precursor fault that acted on the seabed in outermost Varangerfjorden. By use of potential field data, the Caledonian structures on Varanger can be followed to the north into the Barents Sea where the nappe pile in the pre-Carboniferous basement reaches a thickness of several kilometres. Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway |
format |
Article in Journal/Newspaper |
author |
Gabrielsen, Roy Helge Roberts, David Gjelsvik, Tone Sygnabere, Trond Olav Hassan, Muhammad Faleide, Jan Inge |
author_facet |
Gabrielsen, Roy Helge Roberts, David Gjelsvik, Tone Sygnabere, Trond Olav Hassan, Muhammad Faleide, Jan Inge |
author_sort |
Gabrielsen, Roy Helge |
title |
Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway |
title_short |
Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway |
title_full |
Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway |
title_fullStr |
Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway |
title_full_unstemmed |
Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway |
title_sort |
double-folding and thrust-front geometries associated with the timanian and caledonian orogenies in the varanger peninsula, finnmark, north norway |
publishDate |
2022 |
url |
http://hdl.handle.net/10852/97459 https://doi.org/10.1144/jgs2021-153 |
long_lat |
ENVELOPE(-57.083,-57.083,-63.550,-63.550) ENVELOPE(30.000,30.000,70.000,70.000) ENVELOPE(30.528,30.528,70.241,70.241) |
geographic |
Barents Sea Norway Buttress Varangerfjorden Komagelva |
geographic_facet |
Barents Sea Norway Buttress Varangerfjorden Komagelva |
genre |
Barents Sea Finnmark North Norway Varanger Varangerfjord* Varangerfjorden Finnmark |
genre_facet |
Barents Sea Finnmark North Norway Varanger Varangerfjord* Varangerfjorden Finnmark |
op_source |
0016-7649 |
op_relation |
Gabrielsen, Roy Helge Roberts, David Gjelsvik, Tone Sygnabere, Trond Olav Hassan, Muhammad Faleide, Jan Inge . Double-folding and thrust-front geometries associated with the Timanian and Caledonian orogenies in the Varanger Peninsula, Finnmark, North Norway. Journal of the Geological Society. 2022, 178 http://hdl.handle.net/10852/97459 2066577 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of the Geological Society&rft.volume=178&rft.spage=&rft.date=2022 Journal of the Geological Society 179 6 17 https://doi.org/10.1144/jgs2021-153 |
op_doi |
https://doi.org/10.1144/jgs2021-153 |
container_title |
Journal of the Geological Society |
container_volume |
179 |
container_issue |
6 |
_version_ |
1772813399296573440 |