Research Article
Tectonic Controls on Near-Surface Variations in CH4 and CO2 Concentrations along the Northwestern Margin of the Ordos Block, China
Figure 4
Models of earth degassing throughout (a) the Yinchuan Graben and (b) the Haiyuan Block. In (a), the extensional tectonic setting provides pathways (fractures) of gas migration (modified after [35]). In (b), the compressional tectonic setting creates overlapping structures that inhibit the rise of deep gases (modified after [6]).
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