The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland
Ferroan granitoid intrusions are rare in the Archaean rock record, but have played a large role in the evolution of the Proterozoic crust, particular in relation to anorthosite-mangerite-charnockite-granite suites. Here we discuss the petrogenesis of the ca. 2785–2805 Ma ferroan Ilivertalik Intrusiv...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-08-01
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| Series: | Geosciences |
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| Online Access: | http://www.mdpi.com/2076-3263/8/9/319 |
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| author | Tomas Næraa Thomas F. Kokfelt Anders Scherstén Andreas Petersson |
| author_facet | Tomas Næraa Thomas F. Kokfelt Anders Scherstén Andreas Petersson |
| author_sort | Tomas Næraa |
| collection | DOAJ |
| description | Ferroan granitoid intrusions are rare in the Archaean rock record, but have played a large role in the evolution of the Proterozoic crust, particular in relation to anorthosite-mangerite-charnockite-granite suites. Here we discuss the petrogenesis of the ca. 2785–2805 Ma ferroan Ilivertalik Intrusive Complex, which has many geochemical similarities to Proterozoic iron rich granitoids. We present major and trace element whole rock chemistry and combined in-situ zircon U-Pb, Hf and O isotope data. The intrusive complex divides into: (i) minor tabular units of mainly diorite-tonalite compositions, which are typically situated along contacts to the host basement and (ii) interior larger, bodies of mainly granite-granodiorite composition. Geochemically these two unites display continuous to semi-continuous trends in Haker-diagrams. Whole rock REE enrichment display increases from Yb to La, from 10–25 to 80–100 times chondrite, respectively. The diorite-tonalite samples are generally more enriched in REE compared to the granite-granodiorite samples. The complex has hafnium isotope compositions from around +1.5 to −2.5 epsilon units and δ18O compositions in the range of 6.3 to 6.6‰. The complex is interpreted to be derived from partial melting in a crustal source region during anomalously high crustal temperatures. |
| first_indexed | 2024-12-21T17:41:21Z |
| format | Article |
| id | doaj.art-809b66ea40154351a36d00499a4bd0d4 |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-12-21T17:41:21Z |
| publishDate | 2018-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-809b66ea40154351a36d00499a4bd0d42022-12-21T18:55:36ZengMDPI AGGeosciences2076-32632018-08-018931910.3390/geosciences8090319geosciences8090319The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West GreenlandTomas Næraa0Thomas F. Kokfelt1Anders Scherstén2Andreas Petersson3Department of Geology, Lund University, 223 62 Lund, SwedenGeological Survey of Denmark and Greenland (GEUS), 1350 Copenhagen, DenmarkDepartment of Geology, Lund University, 223 62 Lund, SwedenSchool of Earth Sciences, The University of Western Australia, Crawley 6009, AustraliaFerroan granitoid intrusions are rare in the Archaean rock record, but have played a large role in the evolution of the Proterozoic crust, particular in relation to anorthosite-mangerite-charnockite-granite suites. Here we discuss the petrogenesis of the ca. 2785–2805 Ma ferroan Ilivertalik Intrusive Complex, which has many geochemical similarities to Proterozoic iron rich granitoids. We present major and trace element whole rock chemistry and combined in-situ zircon U-Pb, Hf and O isotope data. The intrusive complex divides into: (i) minor tabular units of mainly diorite-tonalite compositions, which are typically situated along contacts to the host basement and (ii) interior larger, bodies of mainly granite-granodiorite composition. Geochemically these two unites display continuous to semi-continuous trends in Haker-diagrams. Whole rock REE enrichment display increases from Yb to La, from 10–25 to 80–100 times chondrite, respectively. The diorite-tonalite samples are generally more enriched in REE compared to the granite-granodiorite samples. The complex has hafnium isotope compositions from around +1.5 to −2.5 epsilon units and δ18O compositions in the range of 6.3 to 6.6‰. The complex is interpreted to be derived from partial melting in a crustal source region during anomalously high crustal temperatures.http://www.mdpi.com/2076-3263/8/9/319ferroan granitezircon geochronologygeochemistryArchaean geology |
| spellingShingle | Tomas Næraa Thomas F. Kokfelt Anders Scherstén Andreas Petersson The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland Geosciences ferroan granite zircon geochronology geochemistry Archaean geology |
| title | The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland |
| title_full | The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland |
| title_fullStr | The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland |
| title_full_unstemmed | The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland |
| title_short | The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland |
| title_sort | ca 2785 2805 ma high temperature ilivertalik intrusive complex of southern west greenland |
| topic | ferroan granite zircon geochronology geochemistry Archaean geology |
| url | http://www.mdpi.com/2076-3263/8/9/319 |
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