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

0518665 - GLÚ 2020 RIV CH eng J - Journal Article
Birski, L. - Słaby, E. - Chatzitheodoridis, E. - Wirth, R. - Majzner, K. - Kozub-Budzyń, G. A. - Sláma, Jiří - 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. Roč. 9, č. 11 (2019), č. článku 695. E-ISSN 2075-163X
Institutional support: RVO:67985831
Keywords : fluorapatite * chlorapatite * amorphous calcium phosphate * volatiles * nakhlite * TEM * EPMA * Raman imaging * LA-ICP-MS
OECD category: Geology
Impact factor: 2.380, year: 2019
Method of publishing: Open access
https://www.mdpi.com/2075-163X/9/11/695

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 a nity 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.
Permanent Link: http://hdl.handle.net/11104/0304997