Tectonic subsidence of the Lomonosov Ridge
The Cenozoic sedimentary record revealed by the Integrated Ocean Drilling Program's Arctic Coring Expedition (ACEX) to the Lomonosov Ridge microcontinent in 2004 is characterized by an unconformity attributed to the period 44-18 Ma. According to conventional thermal kinematic models, the microc...
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ftunivlausanne:oai:serval.unil.ch:BIB_B2654C400006 2024-02-11T10:01:22+01:00 Tectonic subsidence of the Lomonosov Ridge Minakov, A.N. Podladchikov, Y.Y. 2012 https://serval.unil.ch/notice/serval:BIB_B2654C400006 https://doi.org/10.1130/G32445.1 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1130/G32445.1 https://serval.unil.ch/notice/serval:BIB_B2654C400006 doi:10.1130/G32445.1 urn:issn:0091-7613 Geology, vol. 40, pp. 99-102 info:eu-repo/semantics/article article 2012 ftunivlausanne https://doi.org/10.1130/G32445.1 2024-01-22T01:01:23Z The Cenozoic sedimentary record revealed by the Integrated Ocean Drilling Program's Arctic Coring Expedition (ACEX) to the Lomonosov Ridge microcontinent in 2004 is characterized by an unconformity attributed to the period 44-18 Ma. According to conventional thermal kinematic models, the microcontinent should have subsided to >1 km depth owing to rifting and subsequent separation from the Barents-Kara Sea margin at 56 Ma. We propose an alternative model incorporating a simple pressure-temperature (P-T) relation for mantle density. Using this model, we can explain the missing stratigraphic section by post-breakup uplift and erosion. The pattern of linear magnetic anomalies and the spreading geometry imply that the generation of oceanic crust in the central Eurasia Basin could have been restricted and confined by non-volcanic thinning of the mantle lithosphere at an early stage (ca. 56-40 Ma). In response to a rise in temperature, the mantle mineral composition may have changed through breakdown of spinet peridotite and formation of less dense plagioclase peridotite. The consequence of lithosphere heating and related mineral phase transitions would be post-breakup uplift followed by rapid subsidence to the deep-water environment observed on the Lomonosov Ridge today. Article in Journal/Newspaper Arctic Kara Sea Lomonosov Ridge Université de Lausanne (UNIL): Serval - Serveur académique lausannois Arctic Eurasia Basin ENVELOPE(80.000,80.000,87.000,87.000) Kara Sea Geology 40 2 99 102 |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
description |
The Cenozoic sedimentary record revealed by the Integrated Ocean Drilling Program's Arctic Coring Expedition (ACEX) to the Lomonosov Ridge microcontinent in 2004 is characterized by an unconformity attributed to the period 44-18 Ma. According to conventional thermal kinematic models, the microcontinent should have subsided to >1 km depth owing to rifting and subsequent separation from the Barents-Kara Sea margin at 56 Ma. We propose an alternative model incorporating a simple pressure-temperature (P-T) relation for mantle density. Using this model, we can explain the missing stratigraphic section by post-breakup uplift and erosion. The pattern of linear magnetic anomalies and the spreading geometry imply that the generation of oceanic crust in the central Eurasia Basin could have been restricted and confined by non-volcanic thinning of the mantle lithosphere at an early stage (ca. 56-40 Ma). In response to a rise in temperature, the mantle mineral composition may have changed through breakdown of spinet peridotite and formation of less dense plagioclase peridotite. The consequence of lithosphere heating and related mineral phase transitions would be post-breakup uplift followed by rapid subsidence to the deep-water environment observed on the Lomonosov Ridge today. |
format |
Article in Journal/Newspaper |
author |
Minakov, A.N. Podladchikov, Y.Y. |
spellingShingle |
Minakov, A.N. Podladchikov, Y.Y. Tectonic subsidence of the Lomonosov Ridge |
author_facet |
Minakov, A.N. Podladchikov, Y.Y. |
author_sort |
Minakov, A.N. |
title |
Tectonic subsidence of the Lomonosov Ridge |
title_short |
Tectonic subsidence of the Lomonosov Ridge |
title_full |
Tectonic subsidence of the Lomonosov Ridge |
title_fullStr |
Tectonic subsidence of the Lomonosov Ridge |
title_full_unstemmed |
Tectonic subsidence of the Lomonosov Ridge |
title_sort |
tectonic subsidence of the lomonosov ridge |
publishDate |
2012 |
url |
https://serval.unil.ch/notice/serval:BIB_B2654C400006 https://doi.org/10.1130/G32445.1 |
long_lat |
ENVELOPE(80.000,80.000,87.000,87.000) |
geographic |
Arctic Eurasia Basin Kara Sea |
geographic_facet |
Arctic Eurasia Basin Kara Sea |
genre |
Arctic Kara Sea Lomonosov Ridge |
genre_facet |
Arctic Kara Sea Lomonosov Ridge |
op_source |
Geology, vol. 40, pp. 99-102 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G32445.1 https://serval.unil.ch/notice/serval:BIB_B2654C400006 doi:10.1130/G32445.1 urn:issn:0091-7613 |
op_doi |
https://doi.org/10.1130/G32445.1 |
container_title |
Geology |
container_volume |
40 |
container_issue |
2 |
container_start_page |
99 |
op_container_end_page |
102 |
_version_ |
1790597183707283456 |