Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway
The c. 350 km 2 Vega intrusive complex is part of the Bindal Batholith and was emplaced at c. 475 Ma into polydeformed supracrustal rocks of the Helgeland Nappe Complex. The intrusive complex is tilted towards the west, exposing asymmetrical zoning. From east to west, the complex is composed of biot...
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ftgeosoclonfig:oai:figshare.com:article/3453440 2023-05-15T16:34:08+02:00 Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway Wayne T. Marko Calvin G. Barnes Aaron S. Yoshinobu Carol D. Frost Øystein Nordgulen 2016-06-21T11:25:02Z https://doi.org/10.6084/m9.figshare.3453440.v1 https://figshare.com/articles/Geology_geochemistry_and_emplacement_conditions_of_the_Vega_intrusive_complex_an_example_of_large-scale_crustal_anatexis___in_north-central_Norway/3453440 unknown doi:10.6084/m9.figshare.3453440.v1 https://figshare.com/articles/Geology_geochemistry_and_emplacement_conditions_of_the_Vega_intrusive_complex_an_example_of_large-scale_crustal_anatexis___in_north-central_Norway/3453440 CC BY 4.0 CC-BY Geology migmatite granitic magmas peraluminou Granodiorite emplacement conditions 350 km 2 Vega ε Nd 475 Ma ultramafic enclaves Helgeland Nappe Complex Bindal Batholith west metaluminous dioritic rocks Sr granitic rocks asymmetrical zoning biotite granite polydeformed supracrustal rocks mafic rocks supracrustal source rocks muscovite crustal anatexis Text Journal contribution 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3453440.v1 2020-02-21T07:24:15Z The c. 350 km 2 Vega intrusive complex is part of the Bindal Batholith and was emplaced at c. 475 Ma into polydeformed supracrustal rocks of the Helgeland Nappe Complex. The intrusive complex is tilted towards the west, exposing asymmetrical zoning. From east to west, the complex is composed of biotite granite, garnet-biotite granite, garnet-bearing muscovite biotite granodiorite and sillimanite-bearing garnet cordierite muscovite biotite granodiorite. In addition, the complex contains small amounts of intrusive migmatite. Granodiorite and intrusive migmatite contain abundant metasedimentary, mafic and ultramafic enclaves. Granodiorite, granite and migmatite are generally peraluminous to strongly peraluminous, calcic to alkalic and magnesian, with initial 87 Sr/ 86 Sr ratios of 0.7096–0.7469 and ε Nd from −7.0 to −11.0. Emplacement of the Vega intrusive complex was coeval with the intrusion of metaluminous dioritic rocks. The intrusive mafic rocks and enclaves in the complex have MORB-like (mid-ocean ridge basalt-like) to calc-alkaline geochemical characteristics. The lack of an isotopic compositional trend between mafic and granitic rocks indicates that magmas did not mix. Instead granitic magmas formed by unmixing of residual phases from crustally derived magmas. Partial melting of supracrustal source rocks may have been related to intra- and underplating of MORB-like magmas into the lower crust during extension. Other Non-Article Part of Journal/Newspaper Helgeland Geological Society of London: Figshare Bindal ENVELOPE(12.377,12.377,65.088,65.088) Helgeland Norway |
institution |
Open Polar |
collection |
Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology migmatite granitic magmas peraluminou Granodiorite emplacement conditions 350 km 2 Vega ε Nd 475 Ma ultramafic enclaves Helgeland Nappe Complex Bindal Batholith west metaluminous dioritic rocks Sr granitic rocks asymmetrical zoning biotite granite polydeformed supracrustal rocks mafic rocks supracrustal source rocks muscovite crustal anatexis |
spellingShingle |
Geology migmatite granitic magmas peraluminou Granodiorite emplacement conditions 350 km 2 Vega ε Nd 475 Ma ultramafic enclaves Helgeland Nappe Complex Bindal Batholith west metaluminous dioritic rocks Sr granitic rocks asymmetrical zoning biotite granite polydeformed supracrustal rocks mafic rocks supracrustal source rocks muscovite crustal anatexis Wayne T. Marko Calvin G. Barnes Aaron S. Yoshinobu Carol D. Frost Øystein Nordgulen Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway |
topic_facet |
Geology migmatite granitic magmas peraluminou Granodiorite emplacement conditions 350 km 2 Vega ε Nd 475 Ma ultramafic enclaves Helgeland Nappe Complex Bindal Batholith west metaluminous dioritic rocks Sr granitic rocks asymmetrical zoning biotite granite polydeformed supracrustal rocks mafic rocks supracrustal source rocks muscovite crustal anatexis |
description |
The c. 350 km 2 Vega intrusive complex is part of the Bindal Batholith and was emplaced at c. 475 Ma into polydeformed supracrustal rocks of the Helgeland Nappe Complex. The intrusive complex is tilted towards the west, exposing asymmetrical zoning. From east to west, the complex is composed of biotite granite, garnet-biotite granite, garnet-bearing muscovite biotite granodiorite and sillimanite-bearing garnet cordierite muscovite biotite granodiorite. In addition, the complex contains small amounts of intrusive migmatite. Granodiorite and intrusive migmatite contain abundant metasedimentary, mafic and ultramafic enclaves. Granodiorite, granite and migmatite are generally peraluminous to strongly peraluminous, calcic to alkalic and magnesian, with initial 87 Sr/ 86 Sr ratios of 0.7096–0.7469 and ε Nd from −7.0 to −11.0. Emplacement of the Vega intrusive complex was coeval with the intrusion of metaluminous dioritic rocks. The intrusive mafic rocks and enclaves in the complex have MORB-like (mid-ocean ridge basalt-like) to calc-alkaline geochemical characteristics. The lack of an isotopic compositional trend between mafic and granitic rocks indicates that magmas did not mix. Instead granitic magmas formed by unmixing of residual phases from crustally derived magmas. Partial melting of supracrustal source rocks may have been related to intra- and underplating of MORB-like magmas into the lower crust during extension. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Wayne T. Marko Calvin G. Barnes Aaron S. Yoshinobu Carol D. Frost Øystein Nordgulen |
author_facet |
Wayne T. Marko Calvin G. Barnes Aaron S. Yoshinobu Carol D. Frost Øystein Nordgulen |
author_sort |
Wayne T. Marko |
title |
Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway |
title_short |
Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway |
title_full |
Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway |
title_fullStr |
Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway |
title_full_unstemmed |
Geology, geochemistry and emplacement conditions of the Vega intrusive complex: an example of large-scale crustal anatexis in north-central Norway |
title_sort |
geology, geochemistry and emplacement conditions of the vega intrusive complex: an example of large-scale crustal anatexis in north-central norway |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3453440.v1 https://figshare.com/articles/Geology_geochemistry_and_emplacement_conditions_of_the_Vega_intrusive_complex_an_example_of_large-scale_crustal_anatexis___in_north-central_Norway/3453440 |
long_lat |
ENVELOPE(12.377,12.377,65.088,65.088) |
geographic |
Bindal Helgeland Norway |
geographic_facet |
Bindal Helgeland Norway |
genre |
Helgeland |
genre_facet |
Helgeland |
op_relation |
doi:10.6084/m9.figshare.3453440.v1 https://figshare.com/articles/Geology_geochemistry_and_emplacement_conditions_of_the_Vega_intrusive_complex_an_example_of_large-scale_crustal_anatexis___in_north-central_Norway/3453440 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3453440.v1 |
_version_ |
1766023887206744064 |