Multi-mineral coupling reveal iron-sulfur cycles in a receding methane seep ...

• Main Author: 文覃 张
• Format: Dataset
• Language: unknown
• Published: Mendeley 2023
• Subjects: Planktonic foraminifera
• Online Access: https://dx.doi.org/10.17632/bjbnff2gts.1; https://data.mendeley.com/datasets/bjbnff2gts/1

The studies aiming to uncover diverse minerals as archive of paleo- and modern methane seep are extensive. Furthermore, Fe-S cycle in methane seep has attracted our attention for a long time. The predominated biogeochemical reaction in methane seep is sulfate reduction coupled with the anaerobic oxidation of methane and mainly occurs in sulfate–methane transition zone (SMTZ). The H2S generated from this reaction combined with active iron in the sediment and eventually formed pyrite (FeS2). Here, we studied a core with length of 14 m sampled from Shenhu Area, South China Sea by combining multiple methods such as SEM and EDS test, AMS14C dating of planktonic foraminifera. By coupling various minerals with respect to their features, we found two paleo-SMTZs which means there were twice methane seep activities. The AMS14C dating and carbon and oxygen isotope test planktonic foraminifera exhibited the successive sedimentation from MIS3 to MIS1. The increasing contents of pyrite and mean diameter as well as ...