Geology of Langhovde, Lutzow-Holm Bay, East Antarctica
The rocks exposed in Langhovde, Liitzow-Holm Bay, East Antarctica, are chiefly metamorphic and granitic, with less extensive glacial deposits and beach sediments. Metamorphic rocks consist of metabasite, pyroxene gneiss, hornblende gneiss, garnet-biotite gneiss, porphyroblastic gneiss, garnet gneiss...
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National Institute of Polar Research
1974
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ftdoajarticles:oai:doaj.org/article:1e15ce11d4ec41cda8e77181ac8b445c 2023-05-15T13:37:54+02:00 Geology of Langhovde, Lutzow-Holm Bay, East Antarctica Terumi ISHIKAWA 1974-12-01T00:00:00Z https://doi.org/10.15094/00007772 https://doaj.org/article/1e15ce11d4ec41cda8e77181ac8b445c EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00007772 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007772 0085-7289 2432-079X https://doaj.org/article/1e15ce11d4ec41cda8e77181ac8b445c Antarctic Record, Iss 51, Pp 1-17 (1974) Geography (General) G1-922 article 1974 ftdoajarticles https://doi.org/10.15094/00007772 2023-01-08T01:36:14Z The rocks exposed in Langhovde, Liitzow-Holm Bay, East Antarctica, are chiefly metamorphic and granitic, with less extensive glacial deposits and beach sediments. Metamorphic rocks consist of metabasite, pyroxene gneiss, hornblende gneiss, garnet-biotite gneiss, porphyroblastic gneiss, garnet gneiss and garnetbearing granitic gneiss. These rocks generally show gentle angle foliation striking northeast and may be Precambrian or possibly Early Paleozoic in age. The metamorphic rocks of Langhovde have a prominent compositional layering or foliation, denned by alternation of quartz-feldspathic, quartzitic, garnetbiotitic or amphibolitic layers of all scales from a fraction of a centimeter to several tens of meters. Foliation is weak in pyroxene gneiss and hornblende gneiss. In the garnet-biotite gneiss and porphyroblastic gneiss, foliation is accentuated by the parallel arrengement of biotite, garnet, feldspars and quartz. The northern part of Langhovde is marked with fold structures, represented by anticlines with an axis of N45°W and synclines with an axis of E-W. In the southern part is found a monoclinal structure striking NE and dipping to the west. Granitic rock is microcline granite, which occurs in the vicinity of Hukuro Cove. The rock is slightly gneissic, pink-colored, and coarse-grained, and it consists mainly of quartz, perthite or perthitic microcline, and biotite, with small amounts of plagioclase and garnet. Glacial deposits are distributed all over the ice-free area, and particularly thick along the boundary between the continental ice and the ice-free area. Immediately overlying the basement is a glacial deposit composed of gneissose rock boulders and cobbles. The boulders are typically rounded and seem to be similar in composition to the underlying basement gneiss. Beach gravel and sand form a terrace along the shore of the inlet and include fossil shells (Adamussium colbecki and Laternula elliptica). ^<14>C age of them shows 3840 ±90 years B.P. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Directory of Open Access Journals: DOAJ Articles East Antarctica Langhovde ENVELOPE(39.733,39.733,-69.217,-69.217) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Terumi ISHIKAWA Geology of Langhovde, Lutzow-Holm Bay, East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
The rocks exposed in Langhovde, Liitzow-Holm Bay, East Antarctica, are chiefly metamorphic and granitic, with less extensive glacial deposits and beach sediments. Metamorphic rocks consist of metabasite, pyroxene gneiss, hornblende gneiss, garnet-biotite gneiss, porphyroblastic gneiss, garnet gneiss and garnetbearing granitic gneiss. These rocks generally show gentle angle foliation striking northeast and may be Precambrian or possibly Early Paleozoic in age. The metamorphic rocks of Langhovde have a prominent compositional layering or foliation, denned by alternation of quartz-feldspathic, quartzitic, garnetbiotitic or amphibolitic layers of all scales from a fraction of a centimeter to several tens of meters. Foliation is weak in pyroxene gneiss and hornblende gneiss. In the garnet-biotite gneiss and porphyroblastic gneiss, foliation is accentuated by the parallel arrengement of biotite, garnet, feldspars and quartz. The northern part of Langhovde is marked with fold structures, represented by anticlines with an axis of N45°W and synclines with an axis of E-W. In the southern part is found a monoclinal structure striking NE and dipping to the west. Granitic rock is microcline granite, which occurs in the vicinity of Hukuro Cove. The rock is slightly gneissic, pink-colored, and coarse-grained, and it consists mainly of quartz, perthite or perthitic microcline, and biotite, with small amounts of plagioclase and garnet. Glacial deposits are distributed all over the ice-free area, and particularly thick along the boundary between the continental ice and the ice-free area. Immediately overlying the basement is a glacial deposit composed of gneissose rock boulders and cobbles. The boulders are typically rounded and seem to be similar in composition to the underlying basement gneiss. Beach gravel and sand form a terrace along the shore of the inlet and include fossil shells (Adamussium colbecki and Laternula elliptica). ^<14>C age of them shows 3840 ±90 years B.P. |
format |
Article in Journal/Newspaper |
author |
Terumi ISHIKAWA |
author_facet |
Terumi ISHIKAWA |
author_sort |
Terumi ISHIKAWA |
title |
Geology of Langhovde, Lutzow-Holm Bay, East Antarctica |
title_short |
Geology of Langhovde, Lutzow-Holm Bay, East Antarctica |
title_full |
Geology of Langhovde, Lutzow-Holm Bay, East Antarctica |
title_fullStr |
Geology of Langhovde, Lutzow-Holm Bay, East Antarctica |
title_full_unstemmed |
Geology of Langhovde, Lutzow-Holm Bay, East Antarctica |
title_sort |
geology of langhovde, lutzow-holm bay, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1974 |
url |
https://doi.org/10.15094/00007772 https://doaj.org/article/1e15ce11d4ec41cda8e77181ac8b445c |
long_lat |
ENVELOPE(39.733,39.733,-69.217,-69.217) |
geographic |
East Antarctica Langhovde |
geographic_facet |
East Antarctica Langhovde |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Antarctic Record, Iss 51, Pp 1-17 (1974) |
op_relation |
https://doi.org/10.15094/00007772 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007772 0085-7289 2432-079X https://doaj.org/article/1e15ce11d4ec41cda8e77181ac8b445c |
op_doi |
https://doi.org/10.15094/00007772 |
_version_ |
1766099440392732672 |