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Open AccessArticle

Apatite from NWA 10153 and NWA 10645—The Key to Deciphering Magmatic and Fluid Evolution History in Nakhlites

1
Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda 51/55, 00-818 Warsaw, Poland
2
Department of Geological Sciences, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou, 15780 Zografou, Athens, Greece
3
Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany
4
Faculty of Chemistry, Jagiellonian University, Raman Imaging Group, Gronostajowa 2, 30-387 Cracow, Poland
5
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Mickiewicza 30, 30-059 Cracow, Poland
6
Institute of Geology Academy of Sciences of the Czech Republic Rozvojová 269, 165 00 Prague Czech Republic
7
Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Cracow, Senacka 1, 31-002 Cracow, Poland
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(11), 695; https://doi.org/10.3390/min9110695
Received: 10 September 2019 / Revised: 6 November 2019 / Accepted: 7 November 2019 / Published: 10 November 2019
(This article belongs to the Special Issue Mineralogy of Meteorites)
Apatites from Martian nakhlites NWA 10153 and NWA 10645 were used to obtain insight into their crystallization environment and the subsequent postcrystallization evolution path. The research results acquired using multi-tool analyses show distinctive transformation processes that were not fully completed. The crystallization history of three apatite generations (OH-bearing, Cl-rich fluorapatite as well as OH-poor, F-rich chlorapatite and fluorapatite) were reconstructed using transmission electron microscopy and geochemical analyses. Magmatic OH-bearing, Cl-rich fluorapatite changed its primary composition and evolved toward OH-poor, F-rich chlorapatite because of its interaction with fluids. Degassing of restitic magma causes fluorapatite crystallization, which shows a strong structural affinity for the last episode of system evolution. In addition to the three apatite generations, a fourth amorphous phase of calcium phosphate has been identified with Raman spectroscopy. This amorphous phase may be considered a transition phase between magmatic and hydrothermal phases. It may give insight into the dissolution process of magmatic phosphates, help in processing reconstruction, and allow to decipher mineral interactions with hydrothermal fluids.
Keywords: fluorapatite; chlorapatite; amorphous calcium phosphate; volatiles; nakhlite; TEM; EPMA; Raman imaging; LA-ICP-MS fluorapatite; chlorapatite; amorphous calcium phosphate; volatiles; nakhlite; TEM; EPMA; Raman imaging; LA-ICP-MS
MDPI and ACS Style

Birski, Ł.; Słaby, E.; Chatzitheodoridis, E.; Wirth, R.; Majzner, K.; Kozub-Budzyń, G.A.; Sláma, J.; Liszewska, K.; Kocjan, I.; Zagórska, A. Apatite from NWA 10153 and NWA 10645—The Key to Deciphering Magmatic and Fluid Evolution History in Nakhlites. Minerals 2019, 9, 695.

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