Working Paper Article Version 2 This version is not peer-reviewed

Allanites in the Sin Quyen IOCG deposit, North Vietnam

Version 1 : Received: 16 September 2020 / Approved: 18 September 2020 / Online: 18 September 2020 (11:30:20 CEST)
Version 2 : Received: 2 December 2020 / Approved: 3 December 2020 / Online: 3 December 2020 (10:58:03 CET)

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, 2020090433 Nguyen Dinh, C.; Pieczonka, J.; Piestrzynski, A.; Le Khanh, P.; Duong Van, H. Allanites in the Sin Quyen IOCG deposit, North Vietnam. Preprints 2020, 2020090433

Abstract

Allanite minerals are the principal host of REEs in the Sin Quyen, Iron Oxide Copper Gold (IOCG) type deposit. The studied allanites have concentrations of: REE (14-27 wt%), Ca (9-16 wt%), Al (8-19 wt%), Si (26-34 wt%) and Fe (12-21 wt%). Two populations of allanite are documented, the first is texturally older probably related to the Ca-K alteration (second stage of crystallization). This population has higher REE concentrations ranging from 20 to 27 wt%, and the second population texturally younger has lower total REE concentration ranging from 14 to 19.9 wt%, which occur as a rim surrounding the older and likely arose during the K alteration with Cu-Au mineralization (third crystallization). Differences between the two allanite populations are documented by both optical properties and analysis of their chemical composition. The last parameter indicate that the studied allanites belong to the Ce-La-ferriallanite family, with low HREE with an average of 0.21 wt.%. Temperature 355ºC which was calculated using value of δ34S isotopes is interpreted as a temperature of the second crystallization stage of allanite. 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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