Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in
samples of the unexposed continental crust at the rifted margin of western Dronning Maud Land (WDML). The exposed bedrock of the ice-covered study area comprises Jurassic tholeiites and minor Permian sedimentary rocks. The xenoliths comprise mainly granulite facies metamorphosed igneous and sediment...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.503.9504 2023-05-15T16:02:40+02:00 Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in Western Dronning Maud L I. Romu A. V. Luttinen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.9504 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea080.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.9504 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea080.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea080.pdf text ftciteseerx 2016-01-08T09:16:35Z samples of the unexposed continental crust at the rifted margin of western Dronning Maud Land (WDML). The exposed bedrock of the ice-covered study area comprises Jurassic tholeiites and minor Permian sedimentary rocks. The xenoliths comprise mainly granulite facies metamorphosed igneous and sedimentary rock types; sediments of shallower origin and cognate phlogopitite and silicocarbonatite inclusions are also found. This heterogeneous suite of crustal xenoliths shows textural and compositional affinity to Proterozoic rock types of Heimefrontfjella and Mannefallknausane area. Two leucocratic gneissic tonalites, which probably represent middle crustal levels, yielded U-Pb SHRIMP zircon ages of ~1.0–1.3 Ga. The granoblastic mafic granulites probably represent unexposed lower parts of the continental crust: Mineral–whole-rock Sm-Nd isotope results imply compositional affinity to Proterozoic lower crustal xenoliths from Lesotho, South Africa, and equilibration of the Sm-Nd system during Grenvillean and Jurassic magmatic events. Highest pressures, 11-17 kbars, were recorded by mafic garnet granulites. Overall, these lamproite-hosted crustal xenoliths indicate extension of the Proterozoic Maud Belt crust to Vestfjella. Text Dronning Maud Land Unknown Dronning Maud Land Heimefrontfjella ENVELOPE(-11.000,-11.000,-74.667,-74.667) Mannefallknausane ENVELOPE(-14.500,-14.500,-74.583,-74.583) Vestfjella ENVELOPE(-14.000,-14.000,-73.167,-73.167) |
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Open Polar |
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Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
samples of the unexposed continental crust at the rifted margin of western Dronning Maud Land (WDML). The exposed bedrock of the ice-covered study area comprises Jurassic tholeiites and minor Permian sedimentary rocks. The xenoliths comprise mainly granulite facies metamorphosed igneous and sedimentary rock types; sediments of shallower origin and cognate phlogopitite and silicocarbonatite inclusions are also found. This heterogeneous suite of crustal xenoliths shows textural and compositional affinity to Proterozoic rock types of Heimefrontfjella and Mannefallknausane area. Two leucocratic gneissic tonalites, which probably represent middle crustal levels, yielded U-Pb SHRIMP zircon ages of ~1.0–1.3 Ga. The granoblastic mafic granulites probably represent unexposed lower parts of the continental crust: Mineral–whole-rock Sm-Nd isotope results imply compositional affinity to Proterozoic lower crustal xenoliths from Lesotho, South Africa, and equilibration of the Sm-Nd system during Grenvillean and Jurassic magmatic events. Highest pressures, 11-17 kbars, were recorded by mafic garnet granulites. Overall, these lamproite-hosted crustal xenoliths indicate extension of the Proterozoic Maud Belt crust to Vestfjella. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Western Dronning Maud L I. Romu A. V. Luttinen |
spellingShingle |
Western Dronning Maud L I. Romu A. V. Luttinen Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in |
author_facet |
Western Dronning Maud L I. Romu A. V. Luttinen |
author_sort |
Western Dronning Maud L |
title |
Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in |
title_short |
Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in |
title_full |
Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in |
title_fullStr |
Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in |
title_full_unstemmed |
Lamproite-hosted xenoliths of Vestfjella: implications for lithospheric architecture in |
title_sort |
lamproite-hosted xenoliths of vestfjella: implications for lithospheric architecture in |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.9504 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea080.pdf |
long_lat |
ENVELOPE(-11.000,-11.000,-74.667,-74.667) ENVELOPE(-14.500,-14.500,-74.583,-74.583) ENVELOPE(-14.000,-14.000,-73.167,-73.167) |
geographic |
Dronning Maud Land Heimefrontfjella Mannefallknausane Vestfjella |
geographic_facet |
Dronning Maud Land Heimefrontfjella Mannefallknausane Vestfjella |
genre |
Dronning Maud Land |
genre_facet |
Dronning Maud Land |
op_source |
http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea080.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.9504 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea080.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766398332398206976 |