Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem
Exposures through the LGM latero-frontal moraine loops at sites along the west coast of South Island, New Zealand reveal a depositional environment that was dominated by the progradation of steep fronted, debris flow-fed fans, manifest in crudely stratified to massive diamictons, arranged in sub-hor...
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ftuglasgow:oai:eprints.gla.ac.uk:11435 2024-06-02T08:07:05+00:00 Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem Spedding, N. Evans, D.J.A. 2002 https://eprints.gla.ac.uk/11435/ unknown Spedding, N. and Evans, D.J.A. (2002) Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem. Sedimentary Geology <https://eprints.gla.ac.uk/view/journal_volume/Sedimentary_Geology.html>, 149, pp. 21-42. (doi:10.1016/j.quascirev.2010.08.019 <https://doi.org/10.1016/j.quascirev.2010.08.019>) Articles PeerReviewed 2002 ftuglasgow https://doi.org/10.1016/j.quascirev.2010.08.019 2024-05-06T15:08:16Z Exposures through the LGM latero-frontal moraine loops at sites along the west coast of South Island, New Zealand reveal a depositional environment that was dominated by the progradation of steep fronted, debris flow-fed fans, manifest in crudely stratified to massive diamictons, arranged in sub-horizontal to steeply dipping clinoforms and containing discontinuous bodies of variably sorted, stratified sediment (LFA 1). The fans were constructed by debris-covered glaciers advancing over outwash plains, as recorded by well stratified and horizontally bedded gravels, sands and diamicts (LFA 0). The ice-contact slopes of the fans are offlapped by retreat phase deposits in the form of glacilacustrine depo-centres (LFA 2), which record the existence of moraine-dammed lakes. Interdigitation of lake rhythmites and subaerial to subaqueous sediment gravity flow deposits documents intense debris-flow activity on unstable moraine/fan surfaces. Glacier readvances in all catchments are documented by glacitectonic disturbance and localized hydrofracturing of LFA 2, followed by the emplacement of schist-dominated debris flow-fed fans (LFA 3) inside and over the top of the earlier latero-frontal moraine/fan loops. Contorted and disturbed bedding in LFA 3 reflects its partial deposition in supraglacial positions. Clast lithologies in LFAs 1 and 3 reveal that two distinct transport pathways operated during moraine construction, with an early period of latero-frontal fan construction involving mixed lithologies and a later period of ice-contact/supraglacial fan construction dominated by schist lithologies from the mountains. These two periods of deposition were separated by a period of moraine abandonment and paraglacial reworking of ice-contact slopes to produce LFA 2. The occurrence of LFA 3 at all sites indicates that the glacier readvance phase responsible for its deposition was not localized or glacier-specific, and involved the transfer of large volumes of schist, possibly due to rock slope failures, onto glacier surfaces. ... Article in Journal/Newspaper glacier Iceland University of Glasgow: Enlighten - Publications New Zealand Quaternary Science Reviews 29 27-28 3790 3811 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
unknown |
description |
Exposures through the LGM latero-frontal moraine loops at sites along the west coast of South Island, New Zealand reveal a depositional environment that was dominated by the progradation of steep fronted, debris flow-fed fans, manifest in crudely stratified to massive diamictons, arranged in sub-horizontal to steeply dipping clinoforms and containing discontinuous bodies of variably sorted, stratified sediment (LFA 1). The fans were constructed by debris-covered glaciers advancing over outwash plains, as recorded by well stratified and horizontally bedded gravels, sands and diamicts (LFA 0). The ice-contact slopes of the fans are offlapped by retreat phase deposits in the form of glacilacustrine depo-centres (LFA 2), which record the existence of moraine-dammed lakes. Interdigitation of lake rhythmites and subaerial to subaqueous sediment gravity flow deposits documents intense debris-flow activity on unstable moraine/fan surfaces. Glacier readvances in all catchments are documented by glacitectonic disturbance and localized hydrofracturing of LFA 2, followed by the emplacement of schist-dominated debris flow-fed fans (LFA 3) inside and over the top of the earlier latero-frontal moraine/fan loops. Contorted and disturbed bedding in LFA 3 reflects its partial deposition in supraglacial positions. Clast lithologies in LFAs 1 and 3 reveal that two distinct transport pathways operated during moraine construction, with an early period of latero-frontal fan construction involving mixed lithologies and a later period of ice-contact/supraglacial fan construction dominated by schist lithologies from the mountains. These two periods of deposition were separated by a period of moraine abandonment and paraglacial reworking of ice-contact slopes to produce LFA 2. The occurrence of LFA 3 at all sites indicates that the glacier readvance phase responsible for its deposition was not localized or glacier-specific, and involved the transfer of large volumes of schist, possibly due to rock slope failures, onto glacier surfaces. ... |
format |
Article in Journal/Newspaper |
author |
Spedding, N. Evans, D.J.A. |
spellingShingle |
Spedding, N. Evans, D.J.A. Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem |
author_facet |
Spedding, N. Evans, D.J.A. |
author_sort |
Spedding, N. |
title |
Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem |
title_short |
Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem |
title_full |
Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem |
title_fullStr |
Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem |
title_full_unstemmed |
Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem |
title_sort |
sediments and landforms at kviarjokull, southeast iceland: a reappraisal of the glaciated valley landsystem |
publishDate |
2002 |
url |
https://eprints.gla.ac.uk/11435/ |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
glacier Iceland |
genre_facet |
glacier Iceland |
op_relation |
Spedding, N. and Evans, D.J.A. (2002) Sediments and landforms at Kviarjokull, southeast Iceland: a reappraisal of the glaciated valley landsystem. Sedimentary Geology <https://eprints.gla.ac.uk/view/journal_volume/Sedimentary_Geology.html>, 149, pp. 21-42. (doi:10.1016/j.quascirev.2010.08.019 <https://doi.org/10.1016/j.quascirev.2010.08.019>) |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.08.019 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
27-28 |
container_start_page |
3790 |
op_container_end_page |
3811 |
_version_ |
1800752093975281664 |