Assertion: ethane | /r/HasProperty | detected in top 47 mbsf fig. 2
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text: At Site 1231, where ethane and propane were detected in the top 47 mbsf (Fig. 2), the concurrent presence of dissolved manganese, dissolved iron (1), and sorbed methane with δ13C of −57 to −65‰ (Fig. 3), testifies to microbial activity in this sediment interval.