Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling
ABSTRACT A piston core from the basinal part (depth of 5188 m) of the South Shetland Trench (West Antarctica) yielded a terrigenous mud section 11 m long, which can be subdivided with great precision into turbidite and hemipelagite layers. Mud turbidites (mean bed thickness = 44 cm) alternate regula...
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crwiley:10.1111/j.1365-3091.1991.tb01015.x 2024-06-02T07:57:37+00:00 Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling POREBSKI, SZCZEPAN J. MEISCHNER, DIETER GÖRLICH, KRZYSZTOF 1991 http://dx.doi.org/10.1111/j.1365-3091.1991.tb01015.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1991.tb01015.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1991.tb01015.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 38, issue 4, page 691-715 ISSN 0037-0746 1365-3091 journal-article 1991 crwiley https://doi.org/10.1111/j.1365-3091.1991.tb01015.x 2024-05-03T11:01:45Z ABSTRACT A piston core from the basinal part (depth of 5188 m) of the South Shetland Trench (West Antarctica) yielded a terrigenous mud section 11 m long, which can be subdivided with great precision into turbidite and hemipelagite layers. Mud turbidites (mean bed thickness = 44 cm) alternate regularly with, and are best distinguishable from, their hemipelagite host (mean bed thickness = 17 cm) by the following features: (i) sharp basal contacts; (ii) terrigenous sand‐free textures (except basal, well‐sorted silt laminae) and the absence of outsized (ice‐rafted) components; (iii) a laminated, little to non‐bioturbated internal structure; (iv) distinct textural and compositional grading; and (v) marked steps on water‐content and sediment‐density logs. Mud turbidites recovered from the South Shetland Trench differ from an earlier model mud‐turbidite sequence by their: (i) excessive (about six times larger) bed thickness; (ii) complex internal organization, manifested in multiple repetitions (up to four) of the same structural interval(s) in sequential or nonsequential order; (iii) distinctive very fine‐grained cap of highly porous clay, rich in fragments of siliceous biogenics; (iv) widespread zones of penesyndepositional deformation; and (v) evidence of flow reversals. These features are interpreted to record deposition from large, muddy turbidity currents subjected to flow transformations, including soliton‐ and/or seiche‐related reversals, induced by ponding and interactions of the flow with the topographical confinements of the trench. It is concluded that‘contained’muddy turbidites cannot be adequately modelled using published sequences. Differentiation of single‐model and‘contained’mud turbidites offers obvious advantages in basin analysis and in understanding the plethora of turbidity current‐related depositional mechanisms of deep‐sea mud. Article in Journal/Newspaper Antarc* Antarctica West Antarctica Wiley Online Library South Shetland Trench ENVELOPE(-59.500,-59.500,-61.000,-61.000) West Antarctica Sedimentology 38 4 691 715 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT A piston core from the basinal part (depth of 5188 m) of the South Shetland Trench (West Antarctica) yielded a terrigenous mud section 11 m long, which can be subdivided with great precision into turbidite and hemipelagite layers. Mud turbidites (mean bed thickness = 44 cm) alternate regularly with, and are best distinguishable from, their hemipelagite host (mean bed thickness = 17 cm) by the following features: (i) sharp basal contacts; (ii) terrigenous sand‐free textures (except basal, well‐sorted silt laminae) and the absence of outsized (ice‐rafted) components; (iii) a laminated, little to non‐bioturbated internal structure; (iv) distinct textural and compositional grading; and (v) marked steps on water‐content and sediment‐density logs. Mud turbidites recovered from the South Shetland Trench differ from an earlier model mud‐turbidite sequence by their: (i) excessive (about six times larger) bed thickness; (ii) complex internal organization, manifested in multiple repetitions (up to four) of the same structural interval(s) in sequential or nonsequential order; (iii) distinctive very fine‐grained cap of highly porous clay, rich in fragments of siliceous biogenics; (iv) widespread zones of penesyndepositional deformation; and (v) evidence of flow reversals. These features are interpreted to record deposition from large, muddy turbidity currents subjected to flow transformations, including soliton‐ and/or seiche‐related reversals, induced by ponding and interactions of the flow with the topographical confinements of the trench. It is concluded that‘contained’muddy turbidites cannot be adequately modelled using published sequences. Differentiation of single‐model and‘contained’mud turbidites offers obvious advantages in basin analysis and in understanding the plethora of turbidity current‐related depositional mechanisms of deep‐sea mud. |
format |
Article in Journal/Newspaper |
author |
POREBSKI, SZCZEPAN J. MEISCHNER, DIETER GÖRLICH, KRZYSZTOF |
spellingShingle |
POREBSKI, SZCZEPAN J. MEISCHNER, DIETER GÖRLICH, KRZYSZTOF Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling |
author_facet |
POREBSKI, SZCZEPAN J. MEISCHNER, DIETER GÖRLICH, KRZYSZTOF |
author_sort |
POREBSKI, SZCZEPAN J. |
title |
Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling |
title_short |
Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling |
title_full |
Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling |
title_fullStr |
Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling |
title_full_unstemmed |
Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling |
title_sort |
quaternary mud turbidites from the south shetland trench (west antarctica): recognition and implications for turbidite facies modelling |
publisher |
Wiley |
publishDate |
1991 |
url |
http://dx.doi.org/10.1111/j.1365-3091.1991.tb01015.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1991.tb01015.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1991.tb01015.x |
long_lat |
ENVELOPE(-59.500,-59.500,-61.000,-61.000) |
geographic |
South Shetland Trench West Antarctica |
geographic_facet |
South Shetland Trench West Antarctica |
genre |
Antarc* Antarctica West Antarctica |
genre_facet |
Antarc* Antarctica West Antarctica |
op_source |
Sedimentology volume 38, issue 4, page 691-715 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-3091.1991.tb01015.x |
container_title |
Sedimentology |
container_volume |
38 |
container_issue |
4 |
container_start_page |
691 |
op_container_end_page |
715 |
_version_ |
1800740808291254272 |