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Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites
Our understanding of the formation and evolution of the primary lunar crust is based on geochemical systematics from the lunar ferroan anorthosite (FAN) suite. Recently, much effort has been made to understand this suite’s petrologic history to constrain the timing of crystallisation and to interpre...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5517601/ https://www.ncbi.nlm.nih.gov/pubmed/28724931 http://dx.doi.org/10.1038/s41598-017-06134-x |
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author | Pernet-Fisher, J. F. Joy, K. H. Martin, D. J. P. Donaldson Hanna, K. L. |
author_facet | Pernet-Fisher, J. F. Joy, K. H. Martin, D. J. P. Donaldson Hanna, K. L. |
author_sort | Pernet-Fisher, J. F. |
collection | PubMed |
description | Our understanding of the formation and evolution of the primary lunar crust is based on geochemical systematics from the lunar ferroan anorthosite (FAN) suite. Recently, much effort has been made to understand this suite’s petrologic history to constrain the timing of crystallisation and to interpret FAN chemical diversity. We investigate the shock histories of lunar anorthosites by combining Optical Microscope (OM) ‘cold’ cathodoluminescence (CL)-imaging and Fourier Transform Infrared (FTIR) spectroscopy analyses. In the first combined study of its kind, this study demonstrates that over ~4.5 Ga of impact processing, plagioclase is on average weakly shocked (<15 GPa) and examples of high shock states (>30 GPa; maskelynite) are uncommon. To investigate how plagioclase trace-element systematics are affected by moderate to weak shock (~5 to 30 GPa) we couple REE+Y abundances with FTIR analyses for FAN clasts from lunar meteorite Northwest Africa (NWA) 2995. We observe weak correlations between plagioclase shock state and some REE+Y systematics (e.g., La/Y and Sm/Nd ratios). This observation could prove significant to our understanding of how crystallisation ages are evaluated (e.g., plagioclase-whole rock Sm-Nd isochrons) and for what trace-elements can be used to differentiate between lunar lithologies and assess magma source compositional differences. |
format | Online Article Text |
id | pubmed-5517601 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-55176012017-07-20 Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites Pernet-Fisher, J. F. Joy, K. H. Martin, D. J. P. Donaldson Hanna, K. L. Sci Rep Article Our understanding of the formation and evolution of the primary lunar crust is based on geochemical systematics from the lunar ferroan anorthosite (FAN) suite. Recently, much effort has been made to understand this suite’s petrologic history to constrain the timing of crystallisation and to interpret FAN chemical diversity. We investigate the shock histories of lunar anorthosites by combining Optical Microscope (OM) ‘cold’ cathodoluminescence (CL)-imaging and Fourier Transform Infrared (FTIR) spectroscopy analyses. In the first combined study of its kind, this study demonstrates that over ~4.5 Ga of impact processing, plagioclase is on average weakly shocked (<15 GPa) and examples of high shock states (>30 GPa; maskelynite) are uncommon. To investigate how plagioclase trace-element systematics are affected by moderate to weak shock (~5 to 30 GPa) we couple REE+Y abundances with FTIR analyses for FAN clasts from lunar meteorite Northwest Africa (NWA) 2995. We observe weak correlations between plagioclase shock state and some REE+Y systematics (e.g., La/Y and Sm/Nd ratios). This observation could prove significant to our understanding of how crystallisation ages are evaluated (e.g., plagioclase-whole rock Sm-Nd isochrons) and for what trace-elements can be used to differentiate between lunar lithologies and assess magma source compositional differences. Nature Publishing Group UK 2017-07-19 /pmc/articles/PMC5517601/ /pubmed/28724931 http://dx.doi.org/10.1038/s41598-017-06134-x Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Pernet-Fisher, J. F. Joy, K. H. Martin, D. J. P. Donaldson Hanna, K. L. Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites |
title | Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites |
title_full | Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites |
title_fullStr | Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites |
title_full_unstemmed | Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites |
title_short | Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites |
title_sort | assessing the shock state of the lunar highlands: implications for the petrogenesis and chronology of crustal anorthosites |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5517601/ https://www.ncbi.nlm.nih.gov/pubmed/28724931 http://dx.doi.org/10.1038/s41598-017-06134-x |
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