Fig. 6
From: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden
Partial mass chromatograms. Samples are from limestone fracture (VM2:212), sediment-granite contact (VM1:251) and deep granite fractures (VM1:442, CC1:539, CC1:608), showing (a) the n-alkane distribution pattern (straight chain hydrocarbons, m/z 85, ●), (b) the fatty acid distribution (m/z 69, 74; ■) of all investigated samples and (c) weak hopanoid signals (m/z 191) from the calcite in the granite fracture sample CC1:539
