Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175
The continental slope in Orphan Basin, northeast of Newfoundland, is underlain by several seaward-thinning debris-flow wedges alternating with acoustically stratified, regionally extensive, mainly hemipelagic sediments. d18O stratigraphy and volcanic ash layers in a 11.67-m core indicate that the up...
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1996
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ftdatacite:10.1594/pangaea.754856 2023-05-15T15:39:11+02:00 Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175 Hiscott, Richard N Aksu, Ali E 1996 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.754856 https://doi.pangaea.de/10.1594/PANGAEA.754856 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1006/qres.1996.0017 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY DEPTH, sediment/rock Calcite Dolomite Kalifeldspar Plagioclase Quartz Piston corer X-ray diffraction XRD Calculated from weight loss on acidification GF/F filtered Dataset dataset Supplementary Dataset 1996 ftdatacite https://doi.org/10.1594/pangaea.754856 https://doi.org/10.1006/qres.1996.0017 2022-02-09T13:17:17Z The continental slope in Orphan Basin, northeast of Newfoundland, is underlain by several seaward-thinning debris-flow wedges alternating with acoustically stratified, regionally extensive, mainly hemipelagic sediments. d18O stratigraphy and volcanic ash layers in a 11.67-m core indicate that the uppermost debris-flow wedge formed during the last of several sea-level lowstands in isotopic stages 2–4. Similarly, seismic reflection correlation of dated levels at DSDP Site 111 with the Orphan Basin succession suggests that two deeper debris-flow wedges were deposited during oxygen isotopic stages 6 and 8. The oldest of the debris-flow deposits in at least three of the wedges formed well into the corresponding glacial cycle, after ice sheets had reached the edge of the continental shelf. Slower deposition by hemipelagic processes and ice rafting formed the acoustically stratified units, including Heinrich layers. The youngest three debris-flow wedges each have volumes of 1300–1650 km**3. Approximately two-thirds of this material is attributed to glacial erosion of Mesozoic and Tertiary strata beneath the Northeast Newfoundland Shelf. The remainder is believed to have been derived by glacial erosion of older bedrock that now forms the island of Newfoundland. The observed sediment volumes and the inferred basal and upper ages of the debris-flow wedges imply an average glacial denudation rate of about 0.13 mm/yr for this older bedrock, and an average of about 60 m of glacial bedrock erosion since oxygen isotope stage 22. This denudation rate is similar to estimates from the Barents Sea region off Norway. Dataset Barents Sea Labrador Sea Newfoundland DataCite Metadata Store (German National Library of Science and Technology) Newfoundland Barents Sea Norway Northeast Newfoundland Shelf ENVELOPE(-52.500,-52.500,51.000,51.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
DEPTH, sediment/rock Calcite Dolomite Kalifeldspar Plagioclase Quartz Piston corer X-ray diffraction XRD Calculated from weight loss on acidification GF/F filtered |
spellingShingle |
DEPTH, sediment/rock Calcite Dolomite Kalifeldspar Plagioclase Quartz Piston corer X-ray diffraction XRD Calculated from weight loss on acidification GF/F filtered Hiscott, Richard N Aksu, Ali E Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175 |
topic_facet |
DEPTH, sediment/rock Calcite Dolomite Kalifeldspar Plagioclase Quartz Piston corer X-ray diffraction XRD Calculated from weight loss on acidification GF/F filtered |
description |
The continental slope in Orphan Basin, northeast of Newfoundland, is underlain by several seaward-thinning debris-flow wedges alternating with acoustically stratified, regionally extensive, mainly hemipelagic sediments. d18O stratigraphy and volcanic ash layers in a 11.67-m core indicate that the uppermost debris-flow wedge formed during the last of several sea-level lowstands in isotopic stages 2–4. Similarly, seismic reflection correlation of dated levels at DSDP Site 111 with the Orphan Basin succession suggests that two deeper debris-flow wedges were deposited during oxygen isotopic stages 6 and 8. The oldest of the debris-flow deposits in at least three of the wedges formed well into the corresponding glacial cycle, after ice sheets had reached the edge of the continental shelf. Slower deposition by hemipelagic processes and ice rafting formed the acoustically stratified units, including Heinrich layers. The youngest three debris-flow wedges each have volumes of 1300–1650 km**3. Approximately two-thirds of this material is attributed to glacial erosion of Mesozoic and Tertiary strata beneath the Northeast Newfoundland Shelf. The remainder is believed to have been derived by glacial erosion of older bedrock that now forms the island of Newfoundland. The observed sediment volumes and the inferred basal and upper ages of the debris-flow wedges imply an average glacial denudation rate of about 0.13 mm/yr for this older bedrock, and an average of about 60 m of glacial bedrock erosion since oxygen isotope stage 22. This denudation rate is similar to estimates from the Barents Sea region off Norway. |
format |
Dataset |
author |
Hiscott, Richard N Aksu, Ali E |
author_facet |
Hiscott, Richard N Aksu, Ali E |
author_sort |
Hiscott, Richard N |
title |
Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175 |
title_short |
Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175 |
title_full |
Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175 |
title_fullStr |
Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175 |
title_full_unstemmed |
Mineral concentration in sediment core HU92045-11P, supplement to: Hiscott, Richard N; Aksu, Ali E (1996): Quaternary sedimentary processes and budgets in Orphan Basin, Southwestern Labrador Sea. Quaternary Research, 45(2), 160-175 |
title_sort |
mineral concentration in sediment core hu92045-11p, supplement to: hiscott, richard n; aksu, ali e (1996): quaternary sedimentary processes and budgets in orphan basin, southwestern labrador sea. quaternary research, 45(2), 160-175 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1996 |
url |
https://dx.doi.org/10.1594/pangaea.754856 https://doi.pangaea.de/10.1594/PANGAEA.754856 |
long_lat |
ENVELOPE(-52.500,-52.500,51.000,51.000) |
geographic |
Newfoundland Barents Sea Norway Northeast Newfoundland Shelf |
geographic_facet |
Newfoundland Barents Sea Norway Northeast Newfoundland Shelf |
genre |
Barents Sea Labrador Sea Newfoundland |
genre_facet |
Barents Sea Labrador Sea Newfoundland |
op_relation |
https://dx.doi.org/10.1006/qres.1996.0017 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.754856 https://doi.org/10.1006/qres.1996.0017 |
_version_ |
1766370642802769920 |