Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks.
The Sivorg Terrane is the largest crustal block of the Heimefrontfjella. It consists of a thick supracrustal sequence of metavolcanic and metasedimentary rocks that are intruded by a wide range of predominantly granitic plutonic rocks. The protolith ages of the metavolcanic rocks have been dated at...
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ftnerc:oai:nora.nerc.ac.uk:8954 2023-05-15T14:05:16+02:00 Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. Jacobs, Joachim Bauer, Wilfried Weber, Klaus Spaeth, Gerhard Thomas, Robert J. 2009 text http://nora.nerc.ac.uk/id/eprint/8954/ https://nora.nerc.ac.uk/id/eprint/8954/1/Jac2009a.pdf http://www.polarforschung.de/ en eng Deutschen Gesellschaft für Polarforschung https://nora.nerc.ac.uk/id/eprint/8954/1/Jac2009a.pdf Jacobs, Joachim; Bauer, Wilfried; Weber, Klaus; Spaeth, Gerhard; Thomas, Robert J. 2009 Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. Polarforschung, 79 (1). 11-19. Earth Sciences Publication - Article PeerReviewed 2009 ftnerc 2023-02-04T19:25:47Z The Sivorg Terrane is the largest crustal block of the Heimefrontfjella. It consists of a thick supracrustal sequence of metavolcanic and metasedimentary rocks that are intruded by a wide range of predominantly granitic plutonic rocks. The protolith ages of the metavolcanic rocks have been dated at ~1170-1140 Ma and the granitoid intrusions at ~1110-1050 Ma. The best estimate for Grenville-age metamorphism in the Sivorg Terrane is 1090-1060 Ma. Unlike the other two terranes in the Heimefrontfjella, the Sivorg Terrane records intense reworking of Mesoproterozoic rocks during the Late Neoproterozoic- Cambrian East African – Antarctic Orogeny. U-Pb detrital zircon provenance analyses from two samples indicate that at least two age-groups of different supracrustal sequences crop out in the Sivorg Terrane. The older, preorogenic sequence gave youngest detrital ages of ~1140 Ma, which are interpreted as dating the maximum deposition age of the original sediment. These rocks also provide evidence of a Palaeoproterozoic to Archaean foreland. The second sample is dominated by Mesoproterozoic to late Neoproterozoic detrital zircons, with a significant proportion of ages ranging from 1100 to 980 Ma. The youngest ages significantly postdate the Grenville-age metamorphism, so the sediments must have been deposited after or during the Late Mesoproterozoic orogenesis and, as such, might represent remnants of a molasse deposit of the orogen. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Polarforschung Natural Environment Research Council: NERC Open Research Archive Antarctic East Antarctica Heimefrontfjella ENVELOPE(-11.000,-11.000,-74.667,-74.667) |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Jacobs, Joachim Bauer, Wilfried Weber, Klaus Spaeth, Gerhard Thomas, Robert J. Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. |
topic_facet |
Earth Sciences |
description |
The Sivorg Terrane is the largest crustal block of the Heimefrontfjella. It consists of a thick supracrustal sequence of metavolcanic and metasedimentary rocks that are intruded by a wide range of predominantly granitic plutonic rocks. The protolith ages of the metavolcanic rocks have been dated at ~1170-1140 Ma and the granitoid intrusions at ~1110-1050 Ma. The best estimate for Grenville-age metamorphism in the Sivorg Terrane is 1090-1060 Ma. Unlike the other two terranes in the Heimefrontfjella, the Sivorg Terrane records intense reworking of Mesoproterozoic rocks during the Late Neoproterozoic- Cambrian East African – Antarctic Orogeny. U-Pb detrital zircon provenance analyses from two samples indicate that at least two age-groups of different supracrustal sequences crop out in the Sivorg Terrane. The older, preorogenic sequence gave youngest detrital ages of ~1140 Ma, which are interpreted as dating the maximum deposition age of the original sediment. These rocks also provide evidence of a Palaeoproterozoic to Archaean foreland. The second sample is dominated by Mesoproterozoic to late Neoproterozoic detrital zircons, with a significant proportion of ages ranging from 1100 to 980 Ma. The youngest ages significantly postdate the Grenville-age metamorphism, so the sediments must have been deposited after or during the Late Mesoproterozoic orogenesis and, as such, might represent remnants of a molasse deposit of the orogen. |
format |
Article in Journal/Newspaper |
author |
Jacobs, Joachim Bauer, Wilfried Weber, Klaus Spaeth, Gerhard Thomas, Robert J. |
author_facet |
Jacobs, Joachim Bauer, Wilfried Weber, Klaus Spaeth, Gerhard Thomas, Robert J. |
author_sort |
Jacobs, Joachim |
title |
Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. |
title_short |
Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. |
title_full |
Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. |
title_fullStr |
Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. |
title_full_unstemmed |
Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. |
title_sort |
geology of the sivorg terrane, heimefrontfjella, (east antarctica), and new u-pb zircon provenance analyses of metasedimentary rocks. |
publisher |
Deutschen Gesellschaft für Polarforschung |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/8954/ https://nora.nerc.ac.uk/id/eprint/8954/1/Jac2009a.pdf http://www.polarforschung.de/ |
long_lat |
ENVELOPE(-11.000,-11.000,-74.667,-74.667) |
geographic |
Antarctic East Antarctica Heimefrontfjella |
geographic_facet |
Antarctic East Antarctica Heimefrontfjella |
genre |
Antarc* Antarctic Antarctica East Antarctica Polarforschung |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Polarforschung |
op_relation |
https://nora.nerc.ac.uk/id/eprint/8954/1/Jac2009a.pdf Jacobs, Joachim; Bauer, Wilfried; Weber, Klaus; Spaeth, Gerhard; Thomas, Robert J. 2009 Geology of the Sivorg Terrane, Heimefrontfjella, (East Antarctica), and new U-Pb zircon provenance analyses of metasedimentary rocks. Polarforschung, 79 (1). 11-19. |
_version_ |
1766277086215929856 |