Table 1 Summary of microthermometric and Raman microprobe results from fluid inclusions in vein calcite and celestite
Sample | Depth (m) | Stratigraphy | Mineral | Fluid inclusion petrography | Phases | T m(ice) | wt% eq. NaCl | T h(l + v→l) | Raman spectroscopy | |
|---|---|---|---|---|---|---|---|---|---|---|
min to max/avg (n) | min–max/avg | min–max/avg (n) | Gas phase (in addition to H2O) | Trapped solids | ||||||
OFT32 | 415.72 | Geissberg Member | Calcite | Along cleavage planes; Flat negative-crystal inclusions, up to 50 μm | L + V | −1.7 to −1.3/−1.6 (11) | 2.2–2.9/2.7 | 50–65/56 (19) | CH4 | n.o. |
OFT34 | 443.78 | Effingen Member | Calcite | Along cleavage planes; Flat negative-crystal inclusions, up to 100 μm; Accidentaly trapped dark-reddish solid | L + V Unknown solid in one inclusion | −2.9 to −1.3/−1.6 (6) | 1.4–4.8/2.6 | 55–73/60 (18) | CH4 | Unknown |
OFT38 | 569.33 | Effingen Member | Celestite | Parallel trails; No preferential shape, straight walls, 5-10 μm; Accidentally trapped colourless apatite | L + V | −3.2 to −1.5/−2.1 (15) | 2.6–5.3/3.6 | Leakage | CH4 | Apatite |
L + S | −1.7 to −1.6/−1.6 (3) | 2.7–2.9/2.8 | ||||||||
L | −1.9 to −1.4/−1.7 (5) | 2.4–3.2/2.8 | ||||||||
Calcite | Along cleavage planes; Irregular and flat inclusions, up to 100 μm | L + V | −1.7 to −1.6/−1.7 (2) | 2.7–2.9/2.8 | 47–74/68 (10) | CH4 | n.o. | |||
OFT39 | 586.73 | Effingen Member | Celestite | Parallel trails; No preferential shape, straight walls, 5-10 μm; Accidentally trapped colourless apatite | L + V | −3.0 to −2.2/−2.7 (6) | 3.7–5.0/4.4 | Leakage | CH4 | Apatite |
OFT44 | 708.17 | Lower Hauptrogenstein | Calcite | Along cleavage planes; Flat negative-crystal inclusions, up to 50 μm. Rare accidentally trapped dolomite | L + V Dolomite in one inclusion | −2.0 to −1.2/−1.5 (3) | 2.0–3.4/2.6 | 58–83/67 (7) | n.a. | Dolomite |