Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica
The 600–660 Ma East African Orogen (EAO) granulites of the Mozambique Belt were correlated and extended into a coast marginal area of East Antarctica through the NNW–SSW-trending granulite-bearing Schirmacher Oasis. Tracing similarities in lithological association, granulite-facies metamorphism and...
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.3738362 https://figshare.com/collections/Geological_studies_in_the_Baalsrudfjellet_nunatak_between_the_Schirmacher_Oasis_and_the_Wohlthat_Mountains_to_establish_the_continuation_of_the_East_African_Orogen_EAO_in_central_Dronning_Maud_Land_East_Antarctica/3738362 |
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ftdatacite:10.6084/m9.figshare.c.3738362 2023-05-15T13:42:13+02:00 Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica S.K. Roy N.C. Pant A. Kundu A. Dharwadkar P.K. Kumar Sonalika Joshi Raghuram Mohd. Sadiq Mayuri Pandey 2017 https://dx.doi.org/10.6084/m9.figshare.c.3738362 https://figshare.com/collections/Geological_studies_in_the_Baalsrudfjellet_nunatak_between_the_Schirmacher_Oasis_and_the_Wohlthat_Mountains_to_establish_the_continuation_of_the_East_African_Orogen_EAO_in_central_Dronning_Maud_Land_East_Antarctica/3738362 unknown Figshare https://dx.doi.org/10.1144/sp457.3 CC BY https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3738362 https://doi.org/10.1144/sp457.3 2021-11-05T12:55:41Z The 600–660 Ma East African Orogen (EAO) granulites of the Mozambique Belt were correlated and extended into a coast marginal area of East Antarctica through the NNW–SSW-trending granulite-bearing Schirmacher Oasis. Tracing similarities in lithological association, granulite-facies metamorphism and geochronological data, the 640 Ma EAO was extended by another 110 km south of Schirmacher into the Humboldt Mountains in central Dronning Maud Land (cDML). Based on younger anorogenic magmatism east and west of the Humboldt Mountains, a 10–20 km-wide linear corridor of the EAO from the Schirmacher to the Humboldt Mountains was proposed. There are eight nunataks between Schirmacher and the Humboldt Mountains projected above the ice sheet. These nunataks are strategically placed because they represent the small (4–10 km 2 ), isolated rock exposures in approximately 5000 km 2 of ice-covered area. Baalsrudfjellet is one of these nunataks that is located at the easternmost margin of the proposed EAO corridor and represents a significant outcrop to validate the presence of the EAO between Schirmacher and the Humboldt Mountains. This study brings out a two-stage metamorphic evolution ( c . 660–680 Ma and c . 580 Ma) with melt generation associated with the younger event. Geochronological constraints by monazite chemical dating from metapelites confirm and validate the continuation of the EAO in-between the Schirmacher Oasis and the Humboldt Mountains. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Baalsrudfjellet ENVELOPE(12.050,12.050,-70.907,-70.907) Dronning Maud Land East Antarctica Humboldt Mountains ENVELOPE(11.500,11.500,-71.667,-71.667) Wohlthat Mountains ENVELOPE(12.333,12.333,-71.583,-71.583) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences S.K. Roy N.C. Pant A. Kundu A. Dharwadkar P.K. Kumar Sonalika Joshi Raghuram Mohd. Sadiq Mayuri Pandey Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The 600–660 Ma East African Orogen (EAO) granulites of the Mozambique Belt were correlated and extended into a coast marginal area of East Antarctica through the NNW–SSW-trending granulite-bearing Schirmacher Oasis. Tracing similarities in lithological association, granulite-facies metamorphism and geochronological data, the 640 Ma EAO was extended by another 110 km south of Schirmacher into the Humboldt Mountains in central Dronning Maud Land (cDML). Based on younger anorogenic magmatism east and west of the Humboldt Mountains, a 10–20 km-wide linear corridor of the EAO from the Schirmacher to the Humboldt Mountains was proposed. There are eight nunataks between Schirmacher and the Humboldt Mountains projected above the ice sheet. These nunataks are strategically placed because they represent the small (4–10 km 2 ), isolated rock exposures in approximately 5000 km 2 of ice-covered area. Baalsrudfjellet is one of these nunataks that is located at the easternmost margin of the proposed EAO corridor and represents a significant outcrop to validate the presence of the EAO between Schirmacher and the Humboldt Mountains. This study brings out a two-stage metamorphic evolution ( c . 660–680 Ma and c . 580 Ma) with melt generation associated with the younger event. Geochronological constraints by monazite chemical dating from metapelites confirm and validate the continuation of the EAO in-between the Schirmacher Oasis and the Humboldt Mountains. |
format |
Article in Journal/Newspaper |
author |
S.K. Roy N.C. Pant A. Kundu A. Dharwadkar P.K. Kumar Sonalika Joshi Raghuram Mohd. Sadiq Mayuri Pandey |
author_facet |
S.K. Roy N.C. Pant A. Kundu A. Dharwadkar P.K. Kumar Sonalika Joshi Raghuram Mohd. Sadiq Mayuri Pandey |
author_sort |
S.K. Roy |
title |
Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica |
title_short |
Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica |
title_full |
Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica |
title_fullStr |
Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica |
title_full_unstemmed |
Geological studies in the Baalsrudfjellet nunatak between the Schirmacher Oasis and the Wohlthat Mountains to establish the continuation of the East African Orogen (EAO) in central Dronning Maud Land, East Antarctica |
title_sort |
geological studies in the baalsrudfjellet nunatak between the schirmacher oasis and the wohlthat mountains to establish the continuation of the east african orogen (eao) in central dronning maud land, east antarctica |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3738362 https://figshare.com/collections/Geological_studies_in_the_Baalsrudfjellet_nunatak_between_the_Schirmacher_Oasis_and_the_Wohlthat_Mountains_to_establish_the_continuation_of_the_East_African_Orogen_EAO_in_central_Dronning_Maud_Land_East_Antarctica/3738362 |
long_lat |
ENVELOPE(12.050,12.050,-70.907,-70.907) ENVELOPE(11.500,11.500,-71.667,-71.667) ENVELOPE(12.333,12.333,-71.583,-71.583) |
geographic |
Baalsrudfjellet Dronning Maud Land East Antarctica Humboldt Mountains Wohlthat Mountains |
geographic_facet |
Baalsrudfjellet Dronning Maud Land East Antarctica Humboldt Mountains Wohlthat Mountains |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Sheet |
op_relation |
https://dx.doi.org/10.1144/sp457.3 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3738362 https://doi.org/10.1144/sp457.3 |
_version_ |
1766165539854483456 |