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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >High benthic methane flux in low sulfate oceans: Evidence from carbon isotopes in Late Cretaceous Antarctic bivalves
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High benthic methane flux in low sulfate oceans: Evidence from carbon isotopes in Late Cretaceous Antarctic bivalves

机译：低硫酸盐海洋中的高底栖甲烷通量：晚餐南极双抗体中来自碳同位素的证据

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摘要

The shell material of marine benthic bivalves provides a sensitive archive of water chemistry immediately above the sediment-water interface, which in turn is affected by sedimentary geochemistry and redox reactions. Sulfate has a major controlling effect on sedimentary carbon cycling, particularly the processes of methane production and oxidation, with lower concentrations of sulfate likely resulting in an increase in sedimentary methane production. Whilst it is accepted that ocean sulfate varied markedly across the Phanerozoic, evidence of changes in methane production in sediments has so far been lacking. There is potential for the oxidation products of sedimentary methane to be preserved and detected in marine fossils. Here we present the results of high resolution carbonate isotope records from two taxa of well-preserved shallow-infaunal bivalve (Lahillia and Cucullaea) collected from the marine shelf succession across the Cretaceous-Paleogene (K-Pg) boundary in Seymour Island, Antarctica. The succession has preexisting subtle indications of more abundant methane, and the time period is characterized by much lower marine sulfate concentrations than modern.
机译：海洋底栖双壳的壳材料为水化学的敏感档案提供了一种沉积物 - 水界面，其又受沉积地球化学和氧化还原反应的影响。硫酸盐对沉积碳循环，特别是甲烷生产和氧化过程具有主要的控制效果，具有较低浓度的硫酸盐，可能导致沉积甲烷产生的增加。虽然接受海洋硫酸盐，但跨越平衡，沉积物中甲烷产量变化的证据已经缺乏。在海洋化石中保存并检测到沉积甲烷的氧化产物潜力。在这里，我们介绍了从南极洲的白垩纪 - 古常（K-PG）边界的海洋架子连续中收集的两种浅幼儿双向疟原虫（Lahillia和Cucullaea）的高分辨率碳酸盐同位素记录结果。继承具有更丰富的甲烷的微妙表征，时间段的特点是较高的海洋硫酸盐浓度而不是现代。

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