Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica)
Thin sections of impregnated samples were used for micromorphological analysis of the ‘Ricker Hills Tillite’ in southern Victoria Land, Antarctica. The tillite is composed of massive matrix-supported diamicton with a porphyric coarse/fine related distribution, low sorting, low rounding and medium to...
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Online Access: | http://hdl.handle.net/11568/104330 https://doi.org/10.1016/j.quascirev.2004.11.011 |
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ftunivpisairis:oai:arpi.unipi.it:11568/104330 2024-02-04T09:54:30+01:00 Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica) BARONI, CARLO Fasano F. Baroni, Carlo Fasano, F. 2006 STAMPA http://hdl.handle.net/11568/104330 https://doi.org/10.1016/j.quascirev.2004.11.011 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000238300200009 volume:25 issue:9-10 firstpage:976 lastpage:992 numberofpages:17 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11568/104330 doi:10.1016/j.quascirev.2004.11.011 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33646372467 Tillite micromorphology warm-based ice sheet Cenozoic Victoria Land Antarctica info:eu-repo/semantics/article 2006 ftunivpisairis https://doi.org/10.1016/j.quascirev.2004.11.011 2024-01-10T17:42:43Z Thin sections of impregnated samples were used for micromorphological analysis of the ‘Ricker Hills Tillite’ in southern Victoria Land, Antarctica. The tillite is composed of massive matrix-supported diamicton with a porphyric coarse/fine related distribution, low sorting, low rounding and medium to high angularity. Glacial deposits are completely represented by lodgement till. Phyllosilicate reorientation patterns (plasmic fabrics) are visible in most samples, especially associated skelsepic and lattisepic patterns. Syndepositional pervasive till shearing (glacially induced) is evidenced by clast alignments, shear planes, rotational structures and pressure shadows. Boudinage, ductile shear zones, and rotational structures are also widespread in the deformed bedrock. Water-escape structures are clearly evident in the tillite and in the bedrock. Shear planes infilled by injection veins in lodgement till and at the till-bedrock interface testify to the presence of water during deposition. Secondary features like clay and silt coatings, sparite calcite, and oxidation products were found in all the examined outcrops. They formed under phreatic conditions due to saturated water circulation. A warm-based ice sheet was responsible for the deposition of the tillite. Past ice-flow directions were similar to present ones. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Victoria Land ARPI - Archivio della Ricerca dell'Università di Pisa Ricker Hills ENVELOPE(159.167,159.167,-75.683,-75.683) Victoria Land Quaternary Science Reviews 25 9-10 976 992 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
Tillite micromorphology warm-based ice sheet Cenozoic Victoria Land Antarctica |
spellingShingle |
Tillite micromorphology warm-based ice sheet Cenozoic Victoria Land Antarctica BARONI, CARLO Fasano F. Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica) |
topic_facet |
Tillite micromorphology warm-based ice sheet Cenozoic Victoria Land Antarctica |
description |
Thin sections of impregnated samples were used for micromorphological analysis of the ‘Ricker Hills Tillite’ in southern Victoria Land, Antarctica. The tillite is composed of massive matrix-supported diamicton with a porphyric coarse/fine related distribution, low sorting, low rounding and medium to high angularity. Glacial deposits are completely represented by lodgement till. Phyllosilicate reorientation patterns (plasmic fabrics) are visible in most samples, especially associated skelsepic and lattisepic patterns. Syndepositional pervasive till shearing (glacially induced) is evidenced by clast alignments, shear planes, rotational structures and pressure shadows. Boudinage, ductile shear zones, and rotational structures are also widespread in the deformed bedrock. Water-escape structures are clearly evident in the tillite and in the bedrock. Shear planes infilled by injection veins in lodgement till and at the till-bedrock interface testify to the presence of water during deposition. Secondary features like clay and silt coatings, sparite calcite, and oxidation products were found in all the examined outcrops. They formed under phreatic conditions due to saturated water circulation. A warm-based ice sheet was responsible for the deposition of the tillite. Past ice-flow directions were similar to present ones. |
author2 |
Baroni, Carlo Fasano, F. |
format |
Article in Journal/Newspaper |
author |
BARONI, CARLO Fasano F. |
author_facet |
BARONI, CARLO Fasano F. |
author_sort |
BARONI, CARLO |
title |
Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica) |
title_short |
Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica) |
title_full |
Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica) |
title_fullStr |
Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica) |
title_full_unstemmed |
Micromorphological evidence of warm-based glacier deposition from the Richer Hills Tillite (Victoria Land, Antarctica) |
title_sort |
micromorphological evidence of warm-based glacier deposition from the richer hills tillite (victoria land, antarctica) |
publishDate |
2006 |
url |
http://hdl.handle.net/11568/104330 https://doi.org/10.1016/j.quascirev.2004.11.011 |
long_lat |
ENVELOPE(159.167,159.167,-75.683,-75.683) |
geographic |
Ricker Hills Victoria Land |
geographic_facet |
Ricker Hills Victoria Land |
genre |
Antarc* Antarctica Ice Sheet Victoria Land |
genre_facet |
Antarc* Antarctica Ice Sheet Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000238300200009 volume:25 issue:9-10 firstpage:976 lastpage:992 numberofpages:17 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11568/104330 doi:10.1016/j.quascirev.2004.11.011 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33646372467 |
op_doi |
https://doi.org/10.1016/j.quascirev.2004.11.011 |
container_title |
Quaternary Science Reviews |
container_volume |
25 |
container_issue |
9-10 |
container_start_page |
976 |
op_container_end_page |
992 |
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1789974454760112128 |