Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China

<div>Plot showing CO<sub>2</sub>/<sup>3</sup>He versus <i>δ</i><sup>13</sup> C values for gas samples from the shallow depth wells. A: air end-member; L: limestone end-member; S: sediment end-member.</div>

Geofluids

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Figure 9

Figure 9: Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China 