Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula
ABSTRACT Isolated exotic blocks of late Jurassic age occur within an undeformed succession of marine Lower Cretaceous back‐arc basin deposits on the west coast of James Ross Island, Antarctica. These flat, tabular slabs range up to 200 × 800 m in cross‐section and lie concordant with the enclosing C...
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1985
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crwiley:10.1111/j.1365-3091.1985.tb00480.x 2024-06-02T07:58:07+00:00 Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula INESON, J. R. 1985 http://dx.doi.org/10.1111/j.1365-3091.1985.tb00480.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1985.tb00480.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1985.tb00480.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 32, issue 5, page 659-670 ISSN 0037-0746 1365-3091 journal-article 1985 crwiley https://doi.org/10.1111/j.1365-3091.1985.tb00480.x 2024-05-03T11:12:01Z ABSTRACT Isolated exotic blocks of late Jurassic age occur within an undeformed succession of marine Lower Cretaceous back‐arc basin deposits on the west coast of James Ross Island, Antarctica. These flat, tabular slabs range up to 200 × 800 m in cross‐section and lie concordant with the enclosing Cretaceous strata. Although mainly undeformed, one block displays a range of emplacement‐related deformation structures, comparable in many respects to tectonic fabrics produced by simple shear. Emplacement by submarine block gliding is proposed, possibly as the final phase in the evolution of a composite mass transport event. Derivation of such gigantic slabs requires the existence of a steep, highly unstable basin margin during the early Cretaceous. In more complex terranes, differentiation between gravity slides and thrust slices can be difficult. Clearly, internal and marginal disruption of an allochthonous unit is not diagnostic since structures developed within a lithified block during submarine gliding may closely mimic tectonic fabrics. Where contact relationships are ambiguous, emplacement by gravity sliding is suggested by the increasing intensity of internal disruption towards the basal margin and by the style of deformation, reflecting simple shear under low overburden. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island Wiley Online Library Antarctic Antarctic Peninsula Ross Island The Antarctic Sedimentology 32 5 659 670 |
institution |
Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Isolated exotic blocks of late Jurassic age occur within an undeformed succession of marine Lower Cretaceous back‐arc basin deposits on the west coast of James Ross Island, Antarctica. These flat, tabular slabs range up to 200 × 800 m in cross‐section and lie concordant with the enclosing Cretaceous strata. Although mainly undeformed, one block displays a range of emplacement‐related deformation structures, comparable in many respects to tectonic fabrics produced by simple shear. Emplacement by submarine block gliding is proposed, possibly as the final phase in the evolution of a composite mass transport event. Derivation of such gigantic slabs requires the existence of a steep, highly unstable basin margin during the early Cretaceous. In more complex terranes, differentiation between gravity slides and thrust slices can be difficult. Clearly, internal and marginal disruption of an allochthonous unit is not diagnostic since structures developed within a lithified block during submarine gliding may closely mimic tectonic fabrics. Where contact relationships are ambiguous, emplacement by gravity sliding is suggested by the increasing intensity of internal disruption towards the basal margin and by the style of deformation, reflecting simple shear under low overburden. |
format |
Article in Journal/Newspaper |
author |
INESON, J. R. |
spellingShingle |
INESON, J. R. Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula |
author_facet |
INESON, J. R. |
author_sort |
INESON, J. R. |
title |
Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula |
title_short |
Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula |
title_full |
Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula |
title_fullStr |
Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula |
title_full_unstemmed |
Submarine glide blocks from the Lower Cretaceous of the Antarctic Peninsula |
title_sort |
submarine glide blocks from the lower cretaceous of the antarctic peninsula |
publisher |
Wiley |
publishDate |
1985 |
url |
http://dx.doi.org/10.1111/j.1365-3091.1985.tb00480.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1985.tb00480.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1985.tb00480.x |
geographic |
Antarctic Antarctic Peninsula Ross Island The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Ross Island The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island |
op_source |
Sedimentology volume 32, issue 5, page 659-670 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-3091.1985.tb00480.x |
container_title |
Sedimentology |
container_volume |
32 |
container_issue |
5 |
container_start_page |
659 |
op_container_end_page |
670 |
_version_ |
1800741384032878592 |