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Characterization of mesostasis areas in mare basalts: constraining melt compositions from which apatite crystallizes

Potts, N. J.; Tartèse, R.; Anand, M.; Franchi, I. A.; van Westrenen, W.; Barnes, Jessica and Griffiths, A. A. (2014). Characterization of mesostasis areas in mare basalts: constraining melt compositions from which apatite crystallizes. In: 45th Lunar and Planetary Science Conference, 17-21 Mar 2014, Houston, Texas.

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Crystallization of major silicate and oxide phases from basaltic melts produces late-stage liquids whose chemical compositions differ from the initial melt. These chemically evolved liquids crystallize phases in the interstitial mesostasis regions in lunar basaltic rocks. Enrichment of incompatible elements, including volatiles such as OH, F, Cl, is characteristic of these late-stage liquids and encourages growth of accessory phases including apatite [Ca5(PO4)2(F,Cl,OH)]. Apatite is the main volatile bearing crystalline phase in lunar rocks. It starts crystallizing after ~95% melt solidification in typical mare basalts, but could crystallize earlier, after ~85-90% solidification in KREEP basalts. Using the OH contents of apatites, several researchers have calculated water contents for parental magmas. These calculated parental magma water contents can then be used to estimate a range of values for water in the mantle source regions of mare basalts [e.g.,2-6]. Therefore, a better characterization of the mesostasis areas, and of the melts in which apatite forms, is paramount to gain further insights and constraints on water in the lunar interior, especially because important parameters such as partitioning of volatiles between late-stage melts and apatite remain poorly constrained.

Item Type: Conference or Workshop Item
Copyright Holders: 2014 The Author
Keywords: mesotasis; mare basalt; Apollo; apatite
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: 41012
Depositing User: Nicola Potts
Date Deposited: 30 Sep 2014 10:13
Last Modified: 08 May 2019 22:46
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