Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites

Abstract 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...

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Autores principales:	J. F. Pernet-Fisher, K. H. Joy, D. J. P. Martin, K. L. Donaldson Hanna
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6595ef2e18144130b79f28eac0a33312
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spelling	oai:doaj.org-article:6595ef2e18144130b79f28eac0a333122021-12-02T11:41:12ZAssessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites10.1038/s41598-017-06134-x2045-2322https://doaj.org/article/6595ef2e18144130b79f28eac0a333122017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06134-xhttps://doaj.org/toc/2045-2322Abstract 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.J. F. Pernet-FisherK. H. JoyD. J. P. MartinK. L. Donaldson HannaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. F. Pernet-Fisher K. H. Joy D. J. P. Martin K. L. Donaldson Hanna Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites
description	Abstract 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	article
author	J. F. Pernet-Fisher K. H. Joy D. J. P. Martin K. L. Donaldson Hanna
author_facet	J. F. Pernet-Fisher K. H. Joy D. J. P. Martin K. L. Donaldson Hanna
author_sort	J. F. Pernet-Fisher
title	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_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_sort	assessing the shock state of the lunar highlands: implications for the petrogenesis and chronology of crustal anorthosites
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/6595ef2e18144130b79f28eac0a33312
work_keys_str_mv	AT jfpernetfisher assessingtheshockstateofthelunarhighlandsimplicationsforthepetrogenesisandchronologyofcrustalanorthosites AT khjoy assessingtheshockstateofthelunarhighlandsimplicationsforthepetrogenesisandchronologyofcrustalanorthosites AT djpmartin assessingtheshockstateofthelunarhighlandsimplicationsforthepetrogenesisandchronologyofcrustalanorthosites AT kldonaldsonhanna assessingtheshockstateofthelunarhighlandsimplicationsforthepetrogenesisandchronologyofcrustalanorthosites
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Assessing the shock state of the lunar highlands: Implications for the petrogenesis and chronology of crustal anorthosites

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