Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England
Continuous sedimentary gradients are only crudely expressed by standard facies and microfacies methods which are more appropriate to situations where changes occur in relatively discrete steps. In carbonate sediments and rocks, continuous gradients are often represented by the arrangement of compone...
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Blackwell Science Ltd
1991
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Online Access: | http://hdl.handle.net/2078.1/50967 https://doi.org/10.1111/j.1365-3091.1991.tb01012.x |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:50967 2024-05-12T08:08:52+00:00 Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England Hennebert, M. Lees, Alan UCL 1991 http://hdl.handle.net/2078.1/50967 https://doi.org/10.1111/j.1365-3091.1991.tb01012.x eng eng Blackwell Science Ltd boreal:50967 http://hdl.handle.net/2078.1/50967 doi:10.1111/j.1365-3091.1991.tb01012.x urn:ISSN:0037-0746 urn:EISSN:1365-3091 Sedimentology, Vol. 38, no. 4, p. 623-642 (1991) info:eu-repo/semantics/article 1991 ftunivlouvain https://doi.org/10.1111/j.1365-3091.1991.tb01012.x 2024-04-17T17:30:22Z Continuous sedimentary gradients are only crudely expressed by standard facies and microfacies methods which are more appropriate to situations where changes occur in relatively discrete steps. In carbonate sediments and rocks, continuous gradients are often represented by the arrangement of component grain types in a relay, that is, a systematic shifting of the relative importance of the components. Subdivision of such relays into (micro)facies can only be arbitrary. Correspondence analysis is shown to be useful for detecting, isolating and describing relays. Particular use is made of the arch effect in which samples and components from data sets with a strong unidimensional structure (a relay) plot in the form of an arch in the plane of the first two factor axes. A relay index, indicating the position of samples in the relay, can be extracted from the analysis and plotted on maps and stratigraphic logs to reveal details of the sedimentary gradient in areal and/or stratigraphic context. Examples are given from: (i) Recent shallow-marine carbonate sediments from northern Norway, illustrating a relatively simple depositional setting where surface sediments are viewed in plan; and (ii) Lower Carboniferous carbonates of southwest England, representing a more complex regional study of a particular stratigraphic interval viewed in cross-section. In both examples the relays can be related to identifiable environmental gradients. Article in Journal/Newspaper Northern Norway DIAL@UCLouvain (Université catholique de Louvain) Norway The Arch ENVELOPE(-55.981,-55.981,49.700,49.700) Sedimentology 38 4 623 642 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
description |
Continuous sedimentary gradients are only crudely expressed by standard facies and microfacies methods which are more appropriate to situations where changes occur in relatively discrete steps. In carbonate sediments and rocks, continuous gradients are often represented by the arrangement of component grain types in a relay, that is, a systematic shifting of the relative importance of the components. Subdivision of such relays into (micro)facies can only be arbitrary. Correspondence analysis is shown to be useful for detecting, isolating and describing relays. Particular use is made of the arch effect in which samples and components from data sets with a strong unidimensional structure (a relay) plot in the form of an arch in the plane of the first two factor axes. A relay index, indicating the position of samples in the relay, can be extracted from the analysis and plotted on maps and stratigraphic logs to reveal details of the sedimentary gradient in areal and/or stratigraphic context. Examples are given from: (i) Recent shallow-marine carbonate sediments from northern Norway, illustrating a relatively simple depositional setting where surface sediments are viewed in plan; and (ii) Lower Carboniferous carbonates of southwest England, representing a more complex regional study of a particular stratigraphic interval viewed in cross-section. In both examples the relays can be related to identifiable environmental gradients. |
author2 |
UCL |
format |
Article in Journal/Newspaper |
author |
Hennebert, M. Lees, Alan |
spellingShingle |
Hennebert, M. Lees, Alan Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England |
author_facet |
Hennebert, M. Lees, Alan |
author_sort |
Hennebert, M. |
title |
Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England |
title_short |
Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England |
title_full |
Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England |
title_fullStr |
Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England |
title_full_unstemmed |
Environmental Gradients in Carbonate Sediments and Rocks Detected By Correspondence-analysis - Examples From the Recent of Norway and the Dinantian of Southwest England |
title_sort |
environmental gradients in carbonate sediments and rocks detected by correspondence-analysis - examples from the recent of norway and the dinantian of southwest england |
publisher |
Blackwell Science Ltd |
publishDate |
1991 |
url |
http://hdl.handle.net/2078.1/50967 https://doi.org/10.1111/j.1365-3091.1991.tb01012.x |
long_lat |
ENVELOPE(-55.981,-55.981,49.700,49.700) |
geographic |
Norway The Arch |
geographic_facet |
Norway The Arch |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
Sedimentology, Vol. 38, no. 4, p. 623-642 (1991) |
op_relation |
boreal:50967 http://hdl.handle.net/2078.1/50967 doi:10.1111/j.1365-3091.1991.tb01012.x urn:ISSN:0037-0746 urn:EISSN:1365-3091 |
op_doi |
https://doi.org/10.1111/j.1365-3091.1991.tb01012.x |
container_title |
Sedimentology |
container_volume |
38 |
container_issue |
4 |
container_start_page |
623 |
op_container_end_page |
642 |
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1798851990543925248 |