Environmental gradients in carbonate sediments and rocks detected by correspondence analysis: examples from the Recent of Norway and the Dinantian of southwest England
ABSTRACT 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 o...
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Wiley
1991
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crwiley:10.1111/j.1365-3091.1991.tb01012.x 2024-06-02T08:12:06+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, A. 1991 http://dx.doi.org/10.1111/j.1365-3091.1991.tb01012.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1991.tb01012.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1991.tb01012.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 38, issue 4, page 623-642 ISSN 0037-0746 1365-3091 journal-article 1991 crwiley https://doi.org/10.1111/j.1365-3091.1991.tb01012.x 2024-05-03T11:23:15Z ABSTRACT 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 Wiley Online Library Norway The Arch ENVELOPE(-55.981,-55.981,49.700,49.700) Sedimentology 38 4 623 642 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT 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. |
format |
Article in Journal/Newspaper |
author |
HENNEBERT, M. LEES, A. |
spellingShingle |
HENNEBERT, M. LEES, A. 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, A. |
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 |
Wiley |
publishDate |
1991 |
url |
http://dx.doi.org/10.1111/j.1365-3091.1991.tb01012.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1991.tb01012.x https://onlinelibrary.wiley.com/doi/pdf/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 volume 38, issue 4, page 623-642 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
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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1800758432269074432 |