Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea
Abstract Mass wasting is triggered on many continental slopes by a number of mechanisms, including seismic shaking, high sedimentation rates, the presence of weak geological units and gas hydrate dissociation. In this study, the morphology of a Late Miocene–Early Pliocene mass‐transport complex ( MT...
Published in: | Basin Research |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/bre.12288 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12288 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12288 |
id |
crwiley:10.1111/bre.12288 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/bre.12288 2024-06-23T07:55:43+00:00 Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea Omosanya, Kamaldeen Olakunle 2018 http://dx.doi.org/10.1111/bre.12288 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12288 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12288 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Basin Research volume 30, issue 5, page 942-964 ISSN 0950-091X 1365-2117 journal-article 2018 crwiley https://doi.org/10.1111/bre.12288 2024-05-31T08:12:14Z Abstract Mass wasting is triggered on many continental slopes by a number of mechanisms, including seismic shaking, high sedimentation rates, the presence of weak geological units and gas hydrate dissociation. In this study, the morphology of a Late Miocene–Early Pliocene mass‐transport complex ( MTC ) on the Utgard High is unravelled and discussed in relation to possible trigger mechanisms. The approach used here includes 3D seismic interpretation and the analysis of variance attribute maps. The interpreted MTC is located on the crest and flanks of the Utgard High and is composed of three mass‐transport deposits with seismic characters varying from transparent and chaotic seismic facies at the base to slightly deformed layers composed of mounds and rafted blocks in the middle and chaotic to transparent reflections at the top. Lithologically, the MTC consists predominantly of claystone with high gamma ray and low density and resistivity values, demonstrating that the associated mounds represent remobilized ooze sediments. A vertical stack of six magmatic sills emplaced from 55.6 to 56.3 Ma into the Upper Cretaceous shales is interpreted at depths of 3,000–5,500 ms two‐way travel time ( TWTT ). In association with these magmatic sills are several hydrothermal vent complexes that interacted with the top MTC horizon, signifying that episodic and secondary fluid‐venting events might be the principal mechanism facilitating mass wasting in the study area. In addition, the remobilization of ooze sediments into mounds is hypothesized to be dependent on fluids and clayey layers. As a corollary of this work, the importance of relict and recurrent episodes of fluid flow in the Vøring Basin and their influence on the geotechnical integrity of the overburden and later mass wasting is established. Article in Journal/Newspaper Norwegian Sea Wiley Online Library Norwegian Sea Utgard ENVELOPE(13.279,13.279,65.920,65.920) Basin Research 30 5 942 964 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Mass wasting is triggered on many continental slopes by a number of mechanisms, including seismic shaking, high sedimentation rates, the presence of weak geological units and gas hydrate dissociation. In this study, the morphology of a Late Miocene–Early Pliocene mass‐transport complex ( MTC ) on the Utgard High is unravelled and discussed in relation to possible trigger mechanisms. The approach used here includes 3D seismic interpretation and the analysis of variance attribute maps. The interpreted MTC is located on the crest and flanks of the Utgard High and is composed of three mass‐transport deposits with seismic characters varying from transparent and chaotic seismic facies at the base to slightly deformed layers composed of mounds and rafted blocks in the middle and chaotic to transparent reflections at the top. Lithologically, the MTC consists predominantly of claystone with high gamma ray and low density and resistivity values, demonstrating that the associated mounds represent remobilized ooze sediments. A vertical stack of six magmatic sills emplaced from 55.6 to 56.3 Ma into the Upper Cretaceous shales is interpreted at depths of 3,000–5,500 ms two‐way travel time ( TWTT ). In association with these magmatic sills are several hydrothermal vent complexes that interacted with the top MTC horizon, signifying that episodic and secondary fluid‐venting events might be the principal mechanism facilitating mass wasting in the study area. In addition, the remobilization of ooze sediments into mounds is hypothesized to be dependent on fluids and clayey layers. As a corollary of this work, the importance of relict and recurrent episodes of fluid flow in the Vøring Basin and their influence on the geotechnical integrity of the overburden and later mass wasting is established. |
format |
Article in Journal/Newspaper |
author |
Omosanya, Kamaldeen Olakunle |
spellingShingle |
Omosanya, Kamaldeen Olakunle Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea |
author_facet |
Omosanya, Kamaldeen Olakunle |
author_sort |
Omosanya, Kamaldeen Olakunle |
title |
Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea |
title_short |
Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea |
title_full |
Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea |
title_fullStr |
Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea |
title_full_unstemmed |
Episodic fluid flow as a trigger for Miocene‐Pliocene slope instability on the Utgard High, Norwegian Sea |
title_sort |
episodic fluid flow as a trigger for miocene‐pliocene slope instability on the utgard high, norwegian sea |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1111/bre.12288 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbre.12288 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12288 |
long_lat |
ENVELOPE(13.279,13.279,65.920,65.920) |
geographic |
Norwegian Sea Utgard |
geographic_facet |
Norwegian Sea Utgard |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_source |
Basin Research volume 30, issue 5, page 942-964 ISSN 0950-091X 1365-2117 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bre.12288 |
container_title |
Basin Research |
container_volume |
30 |
container_issue |
5 |
container_start_page |
942 |
op_container_end_page |
964 |
_version_ |
1802648403586318336 |