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 1

Petrography, microthermometry, and Raman spectrometry data for the different fluid inclusion types from the Beauvoir granite and the La Bosse stockwork.

Petrography

Microthermometry

Bulk salinity

Gas composition (mol%)

FI-type

n

Rv (%)

Size (µm)

(°C)

ice (°C)

Hh (°C)

Hl (°C)

(°C)

wt.% NaCl eq

n

CO2

N2

CH4

H2S

Beauvoir granite

L1-type

11

20; 60; 40

10–23

−78; −56; −73

−39.9; −12.8

−44

275; 300; 287

491; >600; 542

16.7; 28.1; 26

7

9.7; 65.6; 43.8

20; 81.8; 46

0.3; 22.2; 10.2

—

V2-type

4

80; 90; 90

12–24

−72

−19.3

—

300

375; 595; 465

4.7; 21.9; 15.3

3

57.5; 60.1; 58.5

31.5; 35.2; 33.7

7.2; 8.4; 7.8

—

L2-type

13

20; 40; 30

10–35

−77; −52

−39.9; −1.6

—

215; 407; 359

377; 542; 455

32.6; 48.2; 43.6

1

52.4

34.3

13.2

—

L3-type

1

40

16

−61

−4.26

—

—

322

6.8

—

—

—

—

—

La Bosse stockwork

L1-type

3

40; 40; 40

10–24

−80

−30; −8

−48.7

—

377; 468; 422

27; 28.7; 28

—

—

—

—

—

V2-type

16

60; 80; 60

15–47

−65

−6; −1.4; −3.5

—

—

342; 490; 403

1.4; 9.2; 4.5

7

38.6; 84.3; 55.7

12.9; 53.6; 36.6

2.4; 12.5; 5.9

0; 6.3; 1.7

L2-type

14

30; 40; 30

16–30

−81; −60

−41.8; −2.5

—

263; 328; 286

305; 439; 375

36.7; 40.4; 37.3

—

—

—

—

—

L3-type

27

10; 70; 40

10–77

−72; −61; −72

−2.9; −0.15; −2.1

—

—

338; 398; 380

1.5; 6.5; 3.7

13

22.6; 87.9; 58

7.7; 73.9; 36

0; 10.5; 5.9

—

Values indicated correspond, respectively, to the minimum, maximum, and mode values. Mean values are indicated in italics; —: not determined.