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Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China

Carbonatites, usually occurring within intra-continental rift-related settings, have strong light rare earth element (LREE) enrichment; they rarely contain economic heavy REE (HREE). Here, we report the identification of Late Triassic HREE-Mo-rich carbonatites in the northernmost Qinling orogen. The...

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Autores principales: Song, Wenlei, Xu, Cheng, Smith, Martin P., Kynicky, Jindrich, Huang, Kangjun, Wei, Chunwan, Zhou, Li, Shu, Qihai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5114661/
https://www.ncbi.nlm.nih.gov/pubmed/27857170
http://dx.doi.org/10.1038/srep37377
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author Song, Wenlei
Xu, Cheng
Smith, Martin P.
Kynicky, Jindrich
Huang, Kangjun
Wei, Chunwan
Zhou, Li
Shu, Qihai
author_facet Song, Wenlei
Xu, Cheng
Smith, Martin P.
Kynicky, Jindrich
Huang, Kangjun
Wei, Chunwan
Zhou, Li
Shu, Qihai
author_sort Song, Wenlei
collection PubMed
description Carbonatites, usually occurring within intra-continental rift-related settings, have strong light rare earth element (LREE) enrichment; they rarely contain economic heavy REE (HREE). Here, we report the identification of Late Triassic HREE-Mo-rich carbonatites in the northernmost Qinling orogen. The rocks contain abundant primary HREE minerals and molybdenite. Calcite-hosted fluid inclusions, inferred to represent a magmatic-derived aqueous fluid phase, contain significant concentrations of Mo (~17 ppm), reinforcing the inference that these carbonatitic magmas had high Mo concentrations. By contrast, Late Triassic carbonatites in southernmost Qinling have economic LREE concentrations, but are depleted in HREE and Mo. Both of these carbonatite types have low δ(26)Mg values (−1.89 to −1.07‰), similar to sedimentary carbonates, suggesting a recycled sediment contribution for REE enrichment in their mantle sources. We propose that the carbonatites in the Qinling orogen were formed, at least in part, by the melting of a subducted carbonate-bearing slab, and that 10 Ma younger carbonatite magmas in the northernmost Qinling metasomatized the thickened eclogitic lower crust to produce high levels of HREE and Mo.
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spelling pubmed-51146612016-11-25 Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China Song, Wenlei Xu, Cheng Smith, Martin P. Kynicky, Jindrich Huang, Kangjun Wei, Chunwan Zhou, Li Shu, Qihai Sci Rep Article Carbonatites, usually occurring within intra-continental rift-related settings, have strong light rare earth element (LREE) enrichment; they rarely contain economic heavy REE (HREE). Here, we report the identification of Late Triassic HREE-Mo-rich carbonatites in the northernmost Qinling orogen. The rocks contain abundant primary HREE minerals and molybdenite. Calcite-hosted fluid inclusions, inferred to represent a magmatic-derived aqueous fluid phase, contain significant concentrations of Mo (~17 ppm), reinforcing the inference that these carbonatitic magmas had high Mo concentrations. By contrast, Late Triassic carbonatites in southernmost Qinling have economic LREE concentrations, but are depleted in HREE and Mo. Both of these carbonatite types have low δ(26)Mg values (−1.89 to −1.07‰), similar to sedimentary carbonates, suggesting a recycled sediment contribution for REE enrichment in their mantle sources. We propose that the carbonatites in the Qinling orogen were formed, at least in part, by the melting of a subducted carbonate-bearing slab, and that 10 Ma younger carbonatite magmas in the northernmost Qinling metasomatized the thickened eclogitic lower crust to produce high levels of HREE and Mo. Nature Publishing Group 2016-11-18 /pmc/articles/PMC5114661/ /pubmed/27857170 http://dx.doi.org/10.1038/srep37377 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Song, Wenlei
Xu, Cheng
Smith, Martin P.
Kynicky, Jindrich
Huang, Kangjun
Wei, Chunwan
Zhou, Li
Shu, Qihai
Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China
title Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China
title_full Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China
title_fullStr Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China
title_full_unstemmed Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China
title_short Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China
title_sort origin of unusual hree-mo-rich carbonatites in the qinling orogen, china
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5114661/
https://www.ncbi.nlm.nih.gov/pubmed/27857170
http://dx.doi.org/10.1038/srep37377
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