Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex

The Mt. Riiser-Larsen area of the Napier Complex, East Antarctica, is underlain by various kinds of ultrahigh-temperature (UHT) metamorphic rocks such as orthopyroxene felsic gneiss, garnet felsic gneiss, garnet-sillimanite gneiss, mafic gneiss and meta-ultramafic rocks. On the basis of the mode of...

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Main Authors: Satoko Suzuki, Tomokazu Hokada, Masahiro Ishikawa, Hideo Ishizuka
Format: Report
Language:English
Published: Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University for Advanced Studies 1999
Subjects:
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3045
http://id.nii.ac.jp/1291/00003045/
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spelling ftnipr:oai:nipr.repo.nii.ac.jp:00003045 2023-05-15T13:49:00+02:00 Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex Satoko Suzuki Tomokazu Hokada Masahiro Ishikawa Hideo Ishizuka 1999-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3045 http://id.nii.ac.jp/1291/00003045/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3045&item_no=1&attribute_id=18&file_no=1 en eng Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University for Advanced Studies Geological Institute, Yokohama National University Department of Geology, Kochi University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3045 http://id.nii.ac.jp/1291/00003045/ AA1130866X Polar geoscience, 12, 101-125(1999-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3045&item_no=1&attribute_id=18&file_no=1 bulk rock chemistries Mt. Riiser-Larsen Napier Complex original rocks ultrahigh-temperature metamorphic rocks Departmental Bulletin Paper P(論文) 1999 ftnipr 2022-11-26T19:42:23Z The Mt. Riiser-Larsen area of the Napier Complex, East Antarctica, is underlain by various kinds of ultrahigh-temperature (UHT) metamorphic rocks such as orthopyroxene felsic gneiss, garnet felsic gneiss, garnet-sillimanite gneiss, mafic gneiss and meta-ultramafic rocks. On the basis of the mode of occurrence and petrography, the garnet felsic gneisses are further divided into garnet felsic gneiss I (garnet-poor type) and II (garnet-rich type), the mafic gneisses into quartz-free and -bearing types, and the metaultramafic rocks into phlogopite-free and -bearing types. Bulk rock chemical analyses for the major, minor and rare earth elements (REEs) demonstrate that (1) both the garnetsillimanite gneiss and garnet felsic gneiss II are of sedimentary origin such as mudstone and sandstone, respectively, and (2) other rocks are of igneous origin, as follows: i) the orthopyroxene felsic gneiss and garnet felsic gneiss I are chemically comparable with CIPW normative tonalite to granodiorite and granite, respectively, of which the former also exhibits a calc-alkaline compositional variation with a REE signature comparable to the Archaean TTG (tonalite-trondhjemite-granodiorite); ii) the quartz-free and quartz-bearing mafic gneisses have been derived from flat or slightly LREE-depleted and LREE-enriched tholeiitic basalts, respectively; iii) phlogopite-free and phlogopite-bearing meta-ultramafic rocks have been derived from depleted mantle peridotites and komatiitic rocks, respectively, of which the latter shows a magmatic compositional variation controlled by addition or subtraction of only olivine. These chemical features reveal that the various kinds of original rocks are intermingled in the Riiser-Larsen area, which is important for understanding the site of development of original rocks in the Napier Complex. Report Antarc* Antarctica East Antarctica Enderby Land Polar geoscience National Institute of Polar Research Repository, Japan East Antarctica Riiser-Larsen ENVELOPE(50.667,50.667,-66.783,-66.783) Napier ENVELOPE(-58.440,-58.440,-62.167,-62.167)
institution Open Polar
collection National Institute of Polar Research Repository, Japan
op_collection_id ftnipr
language English
topic bulk rock chemistries
Mt. Riiser-Larsen
Napier Complex
original rocks
ultrahigh-temperature metamorphic rocks
spellingShingle bulk rock chemistries
Mt. Riiser-Larsen
Napier Complex
original rocks
ultrahigh-temperature metamorphic rocks
Satoko Suzuki
Tomokazu Hokada
Masahiro Ishikawa
Hideo Ishizuka
Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex
topic_facet bulk rock chemistries
Mt. Riiser-Larsen
Napier Complex
original rocks
ultrahigh-temperature metamorphic rocks
description The Mt. Riiser-Larsen area of the Napier Complex, East Antarctica, is underlain by various kinds of ultrahigh-temperature (UHT) metamorphic rocks such as orthopyroxene felsic gneiss, garnet felsic gneiss, garnet-sillimanite gneiss, mafic gneiss and meta-ultramafic rocks. On the basis of the mode of occurrence and petrography, the garnet felsic gneisses are further divided into garnet felsic gneiss I (garnet-poor type) and II (garnet-rich type), the mafic gneisses into quartz-free and -bearing types, and the metaultramafic rocks into phlogopite-free and -bearing types. Bulk rock chemical analyses for the major, minor and rare earth elements (REEs) demonstrate that (1) both the garnetsillimanite gneiss and garnet felsic gneiss II are of sedimentary origin such as mudstone and sandstone, respectively, and (2) other rocks are of igneous origin, as follows: i) the orthopyroxene felsic gneiss and garnet felsic gneiss I are chemically comparable with CIPW normative tonalite to granodiorite and granite, respectively, of which the former also exhibits a calc-alkaline compositional variation with a REE signature comparable to the Archaean TTG (tonalite-trondhjemite-granodiorite); ii) the quartz-free and quartz-bearing mafic gneisses have been derived from flat or slightly LREE-depleted and LREE-enriched tholeiitic basalts, respectively; iii) phlogopite-free and phlogopite-bearing meta-ultramafic rocks have been derived from depleted mantle peridotites and komatiitic rocks, respectively, of which the latter shows a magmatic compositional variation controlled by addition or subtraction of only olivine. These chemical features reveal that the various kinds of original rocks are intermingled in the Riiser-Larsen area, which is important for understanding the site of development of original rocks in the Napier Complex.
format Report
author Satoko Suzuki
Tomokazu Hokada
Masahiro Ishikawa
Hideo Ishizuka
author_facet Satoko Suzuki
Tomokazu Hokada
Masahiro Ishikawa
Hideo Ishizuka
author_sort Satoko Suzuki
title Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex
title_short Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex
title_full Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex
title_fullStr Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex
title_full_unstemmed Geochemical study of granulites from Mt. Riiser-Larsen, Enderby Land, East Antarctica: Implication for protoliths of the Archaean Napier Complex
title_sort geochemical study of granulites from mt. riiser-larsen, enderby land, east antarctica: implication for protoliths of the archaean napier complex
publisher Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University for Advanced Studies
publishDate 1999
url https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3045
http://id.nii.ac.jp/1291/00003045/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3045&item_no=1&attribute_id=18&file_no=1
long_lat ENVELOPE(50.667,50.667,-66.783,-66.783)
ENVELOPE(-58.440,-58.440,-62.167,-62.167)
geographic East Antarctica
Riiser-Larsen
Napier
geographic_facet East Antarctica
Riiser-Larsen
Napier
genre Antarc*
Antarctica
East Antarctica
Enderby Land
Polar geoscience
genre_facet Antarc*
Antarctica
East Antarctica
Enderby Land
Polar geoscience
op_relation https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3045
http://id.nii.ac.jp/1291/00003045/
AA1130866X
Polar geoscience, 12, 101-125(1999-10)
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3045&item_no=1&attribute_id=18&file_no=1
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