Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Allanites in the Sin Quyen IOCG deposit, North Vietnam

Version 1 : Received: 20 August 2020 / Approved: 21 August 2020 / Online: 21 August 2020 (11:09:38 CEST)

How to cite: Nguyen Dinh, C.; Pieczonka, J.; Piestrzynski, A.; Le Khanh, P.; Duong Van, H. Allanites in the Sin Quyen IOCG deposit, North Vietnam. Preprints 2020, 2020080482 (doi: 10.20944/preprints202008.0482.v1). Nguyen Dinh, C.; Pieczonka, J.; Piestrzynski, A.; Le Khanh, P.; Duong Van, H. Allanites in the Sin Quyen IOCG deposit, North Vietnam. Preprints 2020, 2020080482 (doi: 10.20944/preprints202008.0482.v1).

Abstract

Abstract: Allanite minerals are the principal host of REEs in the Sin Quyen, Iron Oxide Copper Gold (IOCG) type deposit. The geochemical characteristics of these minerals are discussed in this work. The studied allanites have an unstable concentration of all major elements, such as REE (14-27 wt%), Ca (9-16 wt%), Al (8-19 wt%), Si (26-34 wt%) and Fe (12-21 wt%). Two different varieties of these minerals are documented, the older with higher REE concentrations ranging from 20 to 27 wt%, and younger with lower total REE concentration ranging from 14 to 19 wt%, which occur as a rim surrounding the older. Differences between the two groups of allanites are documented by Raman spectra and optical properties. The WDS chemical composition indicate that the allanites belong to the Ce-La-ferriallanite family, with low ƩHREE with an average of 0.21 wt.%. This work also supports the estimated timing of the deposit development focusing on detailed petrological study, and documented chemical composition of allanites confirmed by simplified statistical analysis. Temperature 355ºC which was calculated using value of δ34S isotopes is interpreted as a temperature of the second crystallization stage of allanite group. The pressure of crystallization solution was calculated and is ranging from 0.98 to 5.88 MPa.

Subject Areas

allanite; REE; ore minerals; IOCG deposit; North Vietnam

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