Modern cold seeps are of fluctuant flux, which could result in variabilities of geochemical archives through intensively influencing the redox condition in pore fluids. However, the geochemical archives are not fully understood when the redox condition changes. Here, tubular carbonates from the Shenhu Sea Area were used to reconstruct the formation environment and redox conditions. The moderately negative δ¹³C values of the carbonates (−40.1‰ to −30.8‰, VPDB) indicate a mixed carbon source of thermogenic and biogenic methane. The low δ¹⁸O values (−2.7‰ to 1.0‰, VPDB) suggest a type of ¹⁸O-depleted pore fluid possibly influenced by gas hydrate formation. Co-variation of Mo_EF, W_EF, Co_EF, and Cr_EF suggests that high Fe contents in the rims of samples R1 and R2 are induced by Fe (oxyhydr)oxidation enrichment, while the positive correlation between Mo_EF and Mn/Al ratio indicates that high Mn contents in the rims of samples R3 and R4 are induced by Mn (oxyhydr)oxidation enrichment. The occurrence of Fe or Mn enrichment in the rims and the absence of Fe/Mn enrichment in the cores suggest Fe/Mn (oxyhydr)oxides forming in pore fluid rather than in bottom seawater. The carbonate phases of the rims enriched in Fe (oxyhydr)oxides are dominated by high magnesium calcite, while those of the rims enriched in Mn (oxyhydr)oxides are dominated by aragonite. The occurrence of Fe or Mn (oxyhydr)oxides corresponds to the previously proposed formation depth for the carbonate phase. The occurrence of dissolution textures in these rims indicates episodic oxic conditions, which would facilitate Fe²⁺/Mn²⁺ oxidation. We suppose that the Fe²⁺ and Mn²⁺ could be supplied through fluid seepage or diffusion from underlying sediments when the flux decreased. Similar archives may be applied to qualitatively reflect the changes of redox conditions in seep systems. Similar scenarios may help us understand the geochemical records in seeps of fluctuant flux.

现代冷渗流具有波动通量，通过强烈影响孔隙流体的氧化还原条件，可能导致地球化学档案的变化。然而，当氧化还原条件发生变化时，地球化学档案并不完全清楚。在这里，来自神狐海域的管状碳酸盐被用来重建地层环境和氧化还原条件。碳酸盐的中度负δ ¹³ C值（-40.1‰至-30.8‰，VPDB）表明热成因和生物成因甲烷的混合碳源。低 δ ¹⁸ O 值（-2.7‰ 至 1.0‰，VPDB）表明一种¹⁸ O 贫化的孔隙流体可能受天然气水合物形成的影响。Mo _EF , W _EF , Co _EF的协变, 和 Cr _EF表明样品 R1 和 R2 边缘的高 Fe 含量是由 Fe (氧氢) 氧化富集引起的, 而 Mo _{EF之间的正相关}和 Mn/Al 比表明样品 R3 和 R4 边缘中的高 Mn 含量是由 Mn（氢氧化物）氧化富集引起的。边缘中出现 Fe 或 Mn 富集，而岩心中没有 Fe/Mn 富集表明 Fe/Mn（氢氧化物）氧化物是在孔隙流体中而不是在底部海水中形成的。富含铁（氢氧化物）氧化物的轮缘的碳酸盐相以高镁方解石为主，而富含锰（氢氧化物）氧化物的轮缘的碳酸盐相则以文石为主。Fe 或 Mn（氢氧化物）氧化物的出现对应于先前提出的碳酸盐相的形成深度。这些边缘中溶解织构的出现表明偶发性氧化条件，这将促进Fe ²⁺ /Mn ²⁺氧化。我们假设 Fe ²⁺当通量降低时，Mn ²⁺可以通过流体渗漏或从下伏沉积物中扩散提供。类似的档案可用于定性反映渗水系统中氧化还原条件的变化。类似的情景可能有助于我们了解波动通量渗漏中的地球化学记录。