Geochemical Signature of Magmatic-Hydrothermal Fluids Exsolved from the Beauvoir Rare-Metal Granite (Massif Central, France): Insights from LA-ICPMS Analysis of Primary Fluid Inclusions

Table 2

Salinity calculated from microthermometric data for the L1- and L2-types fluid inclusions in the H₂O-NaCl system [43] and H₂O-NaCl-LiCl system [44].

			Host-mineral	Size μm	Microthermometry				Salinity in H2O-NaCl system		Salinity in H2O-NaCl-LiCl system
FI-type	Sample	FI n°				ice	Hl		[NaCl] (1)	[NaCl] (2)	[NaCl]	[LiCl]	[Na]	[Li]	Na/Li
					°C	°C	°C	°C	wt.% eq	wt.% eq	wt.%	wt.%	wt.%	wt.%	ratio
Beauvoir granite
L1-type	B1-125a	A4	Toz	14	−78	−37.1	275	491	—	36.3	26.5	12.5	10.4	2.0	5.1
L1-type	B1-379a	A6a	Qtz	23	−73	−37.8	~280	530	34.2	—	26.1	12.9	10.3	2.1	4.9
L1-type	B1-379a	A6b	Qtz	17	−73	−34.8	~280	527	31.9	—	27.1	11.4	10.7	1.9	5.7
L1-type	B1-379a	A6c	Qtz	19	−69	−35.8	~280	515	32.6	—	26.6	11.4	10.5	1.9	5.6
L1-type	B1-379a	9a	Qtz	20	−66	−34.0	282	540	—	36.8	28.5	10.5	11.2	1.7	6.5
L1-type	B1-379c	5b	Toz	10	−56	−39.9	~280	600	36.0	—	24.9	13.1	9.8	2.1	4.6
L1-type	B1-379c	6j	Toz	20	−70	−36.1	~280	578	32.9	—	26.9	12.1	10.6	2.0	5.3
L2-type	B1-125a	11	Qtz	25	−72	−38.1	404	525	—	47.9	41.6	10.4	16.4	1.7	9.6
L2-type	B1-379a	7a	Qtz	30	−73	−39.9	406	402	—	48.1	41.9	11.1	16.5	1.8	9.0
L2-type	B1-379c	21	Qtz	20	−60	−29.0	354	529	—	42.8	37.8	7.2	14.9	1.2	12.6
La Bosse stockwork
L1-type	ECH-X2b	44a	Qtz	16	−80	−29.9	~280	422	28.6	—	30.8	8.2	12.1	1.3	9.0
L1-type	ECH-X2b	44b	Qtz	10	—	−30.0	~280	377	28.7	—	31.6	8.4	12.4	1.4	9.0
L2-type	ECH-X2b	42	Qtz	15	−81.0	−41.8	~280	428	37.8	—	25.6	14.4	10.1	2.4	4.3

Salinity in the H₂O-NaCl system was calculated using the ice-melting temperature (1) and the halite dissolution temperature (2); value; —: not determined.