Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23
Pebbles (>10 mm) sampled from three drill sites on the continental rise west of the Antarctic Peninsula during Ocean Drilling Program Leg 178 were classified by shape and roundness. In addition, pebble lithology and surface texture were visually identified. To increase the pebble sample number to...
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ftdatacite:10.1594/pangaea.735543 2023-05-15T13:40:55+02:00 Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23 Hassler, Lauren E Cowan, Ellen A 2001 application/zip https://dx.doi.org/10.1594/pangaea.735543 https://doi.pangaea.de/10.1594/PANGAEA.735543 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/odp.proc.sr.178.212.2001 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg178 Joides Resolution Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 2001 ftdatacite https://doi.org/10.1594/pangaea.735543 https://doi.org/10.2973/odp.proc.sr.178.212.2001 2022-02-08T16:24:46Z Pebbles (>10 mm) sampled from three drill sites on the continental rise west of the Antarctic Peninsula during Ocean Drilling Program Leg 178 were classified by shape and roundness. In addition, pebble lithology and surface texture were visually identified. To increase the pebble sample number to 331, three sites that were drilled 94 to 213 km from the continental shelf edge were integrated into the data set using magnetostratigraphy for core correlation. Pebbles were compared in three groups defined by the same stratigraphic intervals at each site: 3.1-2.2 Ma (late Pliocene), 2.2-0.76 Ma (late Pliocene-late Pleistocene), and 0.76 Ma to the Holocene. Pebble lithologies originate from sources on the Antarctic Peninsula margin. Most pebbles are metamorphic and sedimentary pebbles are rare (<6%), whereas mafic volcanic and intrusive igneous lithologies increase in abundance upsection. Pebbles from 3.1 to 0.76 Ma, plotted on sphericity-roundness diagrams, indicate original transport as basal and supraglacial/englacial debris. Pebbles are abundant and of diverse lithology. From 0.76 Ma to the present, the number of pebbles is low and their shape characteristics indicate they originated as basal debris. Observed changes in ice-rafted pebbles can be explained by growth of an ice sheet and inundation of the Antarctic Peninsula topography by ice ~0.76 Ma. Prior to this, outlet and valley glaciers transported debris at high levels within and at the base of the ice. The mass accumulation rate of sand fluctuates and includes rounded quartz grains. Ice-sheet growth may have been accompanied by overall cooling from subpolar to polar glacial regimes, which halted meltwater production and enhanced the growth of ice shelves, which consequently reduced sediment supply to icebergs. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelves Iceberg* DataCite Metadata Store (German National Library of Science and Technology) Antarctic Antarctic Peninsula Ramsay ENVELOPE(-44.733,-44.733,-60.733,-60.733) The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg178 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Drilling/drill rig Leg178 Joides Resolution Ocean Drilling Program ODP Hassler, Lauren E Cowan, Ellen A Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23 |
topic_facet |
Drilling/drill rig Leg178 Joides Resolution Ocean Drilling Program ODP |
description |
Pebbles (>10 mm) sampled from three drill sites on the continental rise west of the Antarctic Peninsula during Ocean Drilling Program Leg 178 were classified by shape and roundness. In addition, pebble lithology and surface texture were visually identified. To increase the pebble sample number to 331, three sites that were drilled 94 to 213 km from the continental shelf edge were integrated into the data set using magnetostratigraphy for core correlation. Pebbles were compared in three groups defined by the same stratigraphic intervals at each site: 3.1-2.2 Ma (late Pliocene), 2.2-0.76 Ma (late Pliocene-late Pleistocene), and 0.76 Ma to the Holocene. Pebble lithologies originate from sources on the Antarctic Peninsula margin. Most pebbles are metamorphic and sedimentary pebbles are rare (<6%), whereas mafic volcanic and intrusive igneous lithologies increase in abundance upsection. Pebbles from 3.1 to 0.76 Ma, plotted on sphericity-roundness diagrams, indicate original transport as basal and supraglacial/englacial debris. Pebbles are abundant and of diverse lithology. From 0.76 Ma to the present, the number of pebbles is low and their shape characteristics indicate they originated as basal debris. Observed changes in ice-rafted pebbles can be explained by growth of an ice sheet and inundation of the Antarctic Peninsula topography by ice ~0.76 Ma. Prior to this, outlet and valley glaciers transported debris at high levels within and at the base of the ice. The mass accumulation rate of sand fluctuates and includes rounded quartz grains. Ice-sheet growth may have been accompanied by overall cooling from subpolar to polar glacial regimes, which halted meltwater production and enhanced the growth of ice shelves, which consequently reduced sediment supply to icebergs. |
format |
Article in Journal/Newspaper |
author |
Hassler, Lauren E Cowan, Ellen A |
author_facet |
Hassler, Lauren E Cowan, Ellen A |
author_sort |
Hassler, Lauren E |
title |
Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23 |
title_short |
Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23 |
title_full |
Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23 |
title_fullStr |
Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23 |
title_full_unstemmed |
Characteristics of ice-rafted pebbles from ODP Leg 178 holes, supplement to: Hassler, Lauren E; Cowan, Ellen A (2001): Characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the Antarctic Peninsula (Sites 1095, 1096, and 1101). In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-23 |
title_sort |
characteristics of ice-rafted pebbles from odp leg 178 holes, supplement to: hassler, lauren e; cowan, ellen a (2001): characteristics of ice-rafted pebbles from the continental rise sediment drifts west of the antarctic peninsula (sites 1095, 1096, and 1101). in: barker, pf; camerlenghi, a; acton, gd; ramsay, ats (eds.) proceedings of the ocean drilling program, scientific results, college station, tx (ocean drilling program), 178, 1-23 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2001 |
url |
https://dx.doi.org/10.1594/pangaea.735543 https://doi.pangaea.de/10.1594/PANGAEA.735543 |
long_lat |
ENVELOPE(-44.733,-44.733,-60.733,-60.733) |
geographic |
Antarctic Antarctic Peninsula Ramsay The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Ramsay The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelves Iceberg* |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelves Iceberg* |
op_relation |
https://dx.doi.org/10.2973/odp.proc.sr.178.212.2001 |
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.735543 https://doi.org/10.2973/odp.proc.sr.178.212.2001 |
_version_ |
1766143302342541312 |