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Characterization of mesostasis regions in lunar basalts: Understanding late-stage melt evolution and its influence on apatite formation

Potts, Nicola J.; Tartèse, Romain; Anand, Mahesh; van Westrenen, Wim; Griffiths, Alexandra A.; Barrett, Thomas J. and Franchi, Ian A. (2016). Characterization of mesostasis regions in lunar basalts: Understanding late-stage melt evolution and its influence on apatite formation. Meteoritics & Planetary Science, 51(9) pp. 1555–1575.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1111/maps.12681
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Abstract

Recent studies geared toward understanding the volatile abundances of the lunar interior have focused on the volatile-bearing accessory mineral apatite. Translating measurements of volatile abundances in lunar apatite into the volatile inventory of the silicate melts from which they crystallized, and ultimately of the mantle source regions of lunar magmas, however, has proved more difficult than initially thought. In this contribution, we report a detailed characterization of mesostasis regions in four Apollo mare basalts (10044, 12064, 15058, and 70035) in order to ascertain the compositions of the melts from which apatite crystallized. The texture, modal mineralogy, and reconstructed bulk composition of these mesostasis regions vary greatly within and between samples. There is no clear relationship between bulk-rock basaltic composition and that of bulk-mesostasis regions, indicating that bulk-rock composition may have little influence on mesostasis compositions. The development of individual melt pockets, combined with the occurrence of silicate liquid immiscibility, exerts greater control on the composition and texture of mesostasis regions. In general, the reconstructed late-stage lunar melts have roughly andesitic to dacitic compositions with low alkali contents, displaying much higher SiO2 abundances than the bulk compositions of their host magmatic rocks. Relevant partition coefficients for apatite-melt volatile partitioning under lunar conditions should, therefore, be derived from experiments conducted using intermediate compositions instead of compositions representing mare basalts.

Item Type: Journal Item
Copyright Holders: 2016 The Meteoritical Society
ISSN: 1945-5100
Project Funding Details:
Funded Project NameProject IDFunding Body
STFC DTG 2015 - 2016 (2015 Intake)ST/N50421X/1STFC (Science & Technology Facilities Council)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 46950
Depositing User: Nicola Potts
Date Deposited: 03 Aug 2016 14:25
Last Modified: 08 May 2019 22:41
URI: http://oro.open.ac.uk/id/eprint/46950
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