A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland
We present high spatial resolution ion-microprobe rare earth element (REE) data for discrete growth phases of complex polyphase zircons from early Archaean Amitsoq gneisses, outer Godthabsfjord, SW Greenland. In Matsuda diagrams, the two major growth phases, >3.8 Ga cores and ca. 3.65 Ga rims, ha...
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ftqueensland:oai:eprints.qut.edu.au:126311 2024-02-04T10:00:45+01:00 A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland Whitehouse, M. J. Kamber, B. S. 2003 https://eprints.qut.edu.au/126311/ unknown Elsevier doi:10.1016/s0301-9268(03)00105-0 Whitehouse, M. J. & Kamber, B. S. (2003) A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland. Precambrian Research, 126(3-4), pp. 363-377. https://eprints.qut.edu.au/126311/ Science & Engineering Faculty Consult author(s) regarding copyright matters This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Precambrian Research lanthanides zircon petrogenesis Archaean Greenland Godthabsfjord combined ion-microprobe high-grade metamorphism crustal evolution age significance pb life akilia origin th isotope Geology Contribution to Journal 2003 ftqueensland https://doi.org/10.1016/s0301-9268(03)00105-0 2024-01-08T23:45:18Z We present high spatial resolution ion-microprobe rare earth element (REE) data for discrete growth phases of complex polyphase zircons from early Archaean Amitsoq gneisses, outer Godthabsfjord, SW Greenland. In Matsuda diagrams, the two major growth phases, >3.8 Ga cores and ca. 3.65 Ga rims, have steep positive slopes from La to Lu, prominent positive Ce anomalies and negative Eu anomalies that are consistent with growth in a melt. Exceptions to this are non-cathodolurnmescent zircon developed between the cores and rims, sometimes truncating zoning in the cores, and late Archaean prismatic tip overgrowths, both of which exhibit flatter light REE (LREE) patterns and have small or no Eu anomaly, which we interpret as the result of metamorphism and/or small-degree, isolated partial melting. Our data support previous interpretations that the ca. 3.65 Ga zircon phase was generated in a melt, with the >3.8 Ga phase representing either original protolith zircons in a large degree partial melt or inherited zircons in an introduced magma. Regardless which of these two interpretations is correct for these, and similar, rocks in the outer GodthAbsfjord, the 3.65 Ga event will have profoundly affected isotopic systems and obscured beyond recognition any earlier igneous features such as cross-cutting relationships, which may only be assigned a minimum 3.65 Ga age. (C) 2003 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Greenland Queensland University of Technology: QUT ePrints Greenland Precambrian Research 126 3-4 363 377 |
institution |
Open Polar |
collection |
Queensland University of Technology: QUT ePrints |
op_collection_id |
ftqueensland |
language |
unknown |
topic |
lanthanides zircon petrogenesis Archaean Greenland Godthabsfjord combined ion-microprobe high-grade metamorphism crustal evolution age significance pb life akilia origin th isotope Geology |
spellingShingle |
lanthanides zircon petrogenesis Archaean Greenland Godthabsfjord combined ion-microprobe high-grade metamorphism crustal evolution age significance pb life akilia origin th isotope Geology Whitehouse, M. J. Kamber, B. S. A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland |
topic_facet |
lanthanides zircon petrogenesis Archaean Greenland Godthabsfjord combined ion-microprobe high-grade metamorphism crustal evolution age significance pb life akilia origin th isotope Geology |
description |
We present high spatial resolution ion-microprobe rare earth element (REE) data for discrete growth phases of complex polyphase zircons from early Archaean Amitsoq gneisses, outer Godthabsfjord, SW Greenland. In Matsuda diagrams, the two major growth phases, >3.8 Ga cores and ca. 3.65 Ga rims, have steep positive slopes from La to Lu, prominent positive Ce anomalies and negative Eu anomalies that are consistent with growth in a melt. Exceptions to this are non-cathodolurnmescent zircon developed between the cores and rims, sometimes truncating zoning in the cores, and late Archaean prismatic tip overgrowths, both of which exhibit flatter light REE (LREE) patterns and have small or no Eu anomaly, which we interpret as the result of metamorphism and/or small-degree, isolated partial melting. Our data support previous interpretations that the ca. 3.65 Ga zircon phase was generated in a melt, with the >3.8 Ga phase representing either original protolith zircons in a large degree partial melt or inherited zircons in an introduced magma. Regardless which of these two interpretations is correct for these, and similar, rocks in the outer GodthAbsfjord, the 3.65 Ga event will have profoundly affected isotopic systems and obscured beyond recognition any earlier igneous features such as cross-cutting relationships, which may only be assigned a minimum 3.65 Ga age. (C) 2003 Elsevier Science B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Whitehouse, M. J. Kamber, B. S. |
author_facet |
Whitehouse, M. J. Kamber, B. S. |
author_sort |
Whitehouse, M. J. |
title |
A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland |
title_short |
A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland |
title_full |
A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland |
title_fullStr |
A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland |
title_full_unstemmed |
A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland |
title_sort |
rare earth element study of complex zircons from early archaean amitsoq gneisses, godthabsfjord, south-west greenland |
publisher |
Elsevier |
publishDate |
2003 |
url |
https://eprints.qut.edu.au/126311/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Precambrian Research |
op_relation |
doi:10.1016/s0301-9268(03)00105-0 Whitehouse, M. J. & Kamber, B. S. (2003) A rare earth element study of complex zircons from early Archaean Amitsoq gneisses, Godthabsfjord, south-west Greenland. Precambrian Research, 126(3-4), pp. 363-377. https://eprints.qut.edu.au/126311/ Science & Engineering Faculty |
op_rights |
Consult author(s) regarding copyright matters This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
op_doi |
https://doi.org/10.1016/s0301-9268(03)00105-0 |
container_title |
Precambrian Research |
container_volume |
126 |
container_issue |
3-4 |
container_start_page |
363 |
op_container_end_page |
377 |
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1789966212732551168 |