Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE
International audience A network of monazite-rich, coarse-grained veins and fine-grained veins permeating the mid-Proterozoic Concordia Granite in the Kliphoog area near Springbok, Namaqualand, North Cape Province, South Africa, are describedwith respect to theirwhole-rock chemistry, petrography, mi...
Published in: | Lithos |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Subjects: | |
Online Access: | https://cnrs.hal.science/hal-04627216 https://doi.org/10.1016/j.lithos.2020.105762 |
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ftunivrennes1hal:oai:HAL:hal-04627216v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Rennes 1: Publications scientifiques (HAL) |
op_collection_id |
ftunivrennes1hal |
language |
English |
topic |
Zircon Monazite Fluids REE Granite South Africa [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
spellingShingle |
Zircon Monazite Fluids REE Granite South Africa [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy Harlov, Daniel Ballouard, Christophe Elburg, Marlina Knoper, Michael Wilke, Franziska Ning, Wen Bin Andreoli, Marco A.G. Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE |
topic_facet |
Zircon Monazite Fluids REE Granite South Africa [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
description |
International audience A network of monazite-rich, coarse-grained veins and fine-grained veins permeating the mid-Proterozoic Concordia Granite in the Kliphoog area near Springbok, Namaqualand, North Cape Province, South Africa, are describedwith respect to theirwhole-rock chemistry, petrography, mineralogy, andmineral chemistry along with zircon andmonazite geochronology. Chondrite-normalized trace element data indicate that the coarse-grained veins are enriched in LREE relative to the Concordia GranitewithHREE enrichment being somewhat variable.HREE in altered Concordia Granite, at the contact with the coarse-grained vein, are heavily depleted compared to unaltered Concordia Granite while the LREE show the same approximate abundances. Chloritization is common in the coarse-grained veins along mineral grain boundaries with chlorite replacing most of the orthopyroxene megacrysts, though occasional remnants of orthopyroxene remain in the core. A traverse across one of the coarse-grained veins showed no obvious mineral chemical trends between the vein and surrounding granite. Relic Fe-richmegacryst orthopyroxene has an Al2O3 content of around 2.0 wt% suggesting formation at around 700 °C. The Fe-rich biotite has mean Ti values ranging from TiO2=4.1 to 1.2 wt% indicating formation at 700–800 °C. The coarse-grained veins and fine-grained veins are characterized by abundant accessory Th-rich monazite, heterogeneously distributed in the veins. Lesser amounts of monazite are found in the granite. Other accessory minerals in the veins and granite include zircon and rare fluorapatite. Back-scattered electron imaging shows that the anhedral to euhedral monazite grains (up to more than 1500 μm in size) tend to be complexly zoned with light and dark areas. Lighter areas are more enriched in Th and/or Ce than darker areas. This complex zoning can occur as magmatic/sector zoning and more commonly as a complex series of metasomatic alteration events. Metasomatic textures, which are due to variable fluid-induced mobility of ... |
author2 |
German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) GeoRessources Institut national des sciences de l'Univers (INSU - CNRS)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) University of Johannesburg South Africa (UJ) State Key Laboratory of Geological Processes and Mineral Resources Wuhan (GPMR) China University of Geosciences Wuhan (CUG) University of the Witwatersrand Johannesburg (WITS) ANR-10-LABX-0021,RESSOURCES21,Strategic metal resources of the 21st century(2010) |
format |
Article in Journal/Newspaper |
author |
Harlov, Daniel Ballouard, Christophe Elburg, Marlina Knoper, Michael Wilke, Franziska Ning, Wen Bin Andreoli, Marco A.G. |
author_facet |
Harlov, Daniel Ballouard, Christophe Elburg, Marlina Knoper, Michael Wilke, Franziska Ning, Wen Bin Andreoli, Marco A.G. |
author_sort |
Harlov, Daniel |
title |
Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE |
title_short |
Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE |
title_full |
Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE |
title_fullStr |
Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE |
title_full_unstemmed |
Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE |
title_sort |
genesis of monazite-rich, orthopyroxene-bearing veins in the kliphoog area of the concordia granite, springbok, namaqualand, south africa: sources, fluids, and the mobility of actinides and ree |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://cnrs.hal.science/hal-04627216 https://doi.org/10.1016/j.lithos.2020.105762 |
genre |
North Cape |
genre_facet |
North Cape |
op_source |
ISSN: 0024-4937 Lithos https://cnrs.hal.science/hal-04627216 Lithos, 2020, 376-377, pp.105762. ⟨10.1016/j.lithos.2020.105762⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2020.105762 hal-04627216 https://cnrs.hal.science/hal-04627216 doi:10.1016/j.lithos.2020.105762 |
op_doi |
https://doi.org/10.1016/j.lithos.2020.105762 |
container_title |
Lithos |
container_volume |
376-377 |
container_start_page |
105762 |
_version_ |
1810464956486778880 |
spelling |
ftunivrennes1hal:oai:HAL:hal-04627216v1 2024-09-15T18:24:34+00:00 Genesis of monazite-rich, orthopyroxene-bearing veins in the Kliphoog area of the Concordia Granite, Springbok, Namaqualand, South Africa: Sources, fluids, and the mobility of actinides and REE Harlov, Daniel Ballouard, Christophe Elburg, Marlina Knoper, Michael Wilke, Franziska Ning, Wen Bin Andreoli, Marco A.G. German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) GeoRessources Institut national des sciences de l'Univers (INSU - CNRS)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) University of Johannesburg South Africa (UJ) State Key Laboratory of Geological Processes and Mineral Resources Wuhan (GPMR) China University of Geosciences Wuhan (CUG) University of the Witwatersrand Johannesburg (WITS) ANR-10-LABX-0021,RESSOURCES21,Strategic metal resources of the 21st century(2010) 2020-12 https://cnrs.hal.science/hal-04627216 https://doi.org/10.1016/j.lithos.2020.105762 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2020.105762 hal-04627216 https://cnrs.hal.science/hal-04627216 doi:10.1016/j.lithos.2020.105762 ISSN: 0024-4937 Lithos https://cnrs.hal.science/hal-04627216 Lithos, 2020, 376-377, pp.105762. ⟨10.1016/j.lithos.2020.105762⟩ Zircon Monazite Fluids REE Granite South Africa [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy info:eu-repo/semantics/article Journal articles 2020 ftunivrennes1hal https://doi.org/10.1016/j.lithos.2020.105762 2024-07-11T23:35:00Z International audience A network of monazite-rich, coarse-grained veins and fine-grained veins permeating the mid-Proterozoic Concordia Granite in the Kliphoog area near Springbok, Namaqualand, North Cape Province, South Africa, are describedwith respect to theirwhole-rock chemistry, petrography, mineralogy, andmineral chemistry along with zircon andmonazite geochronology. Chondrite-normalized trace element data indicate that the coarse-grained veins are enriched in LREE relative to the Concordia GranitewithHREE enrichment being somewhat variable.HREE in altered Concordia Granite, at the contact with the coarse-grained vein, are heavily depleted compared to unaltered Concordia Granite while the LREE show the same approximate abundances. Chloritization is common in the coarse-grained veins along mineral grain boundaries with chlorite replacing most of the orthopyroxene megacrysts, though occasional remnants of orthopyroxene remain in the core. A traverse across one of the coarse-grained veins showed no obvious mineral chemical trends between the vein and surrounding granite. Relic Fe-richmegacryst orthopyroxene has an Al2O3 content of around 2.0 wt% suggesting formation at around 700 °C. The Fe-rich biotite has mean Ti values ranging from TiO2=4.1 to 1.2 wt% indicating formation at 700–800 °C. The coarse-grained veins and fine-grained veins are characterized by abundant accessory Th-rich monazite, heterogeneously distributed in the veins. Lesser amounts of monazite are found in the granite. Other accessory minerals in the veins and granite include zircon and rare fluorapatite. Back-scattered electron imaging shows that the anhedral to euhedral monazite grains (up to more than 1500 μm in size) tend to be complexly zoned with light and dark areas. Lighter areas are more enriched in Th and/or Ce than darker areas. This complex zoning can occur as magmatic/sector zoning and more commonly as a complex series of metasomatic alteration events. Metasomatic textures, which are due to variable fluid-induced mobility of ... Article in Journal/Newspaper North Cape Université de Rennes 1: Publications scientifiques (HAL) Lithos 376-377 105762 |