Geochemical Features Of Redox-Sensitive Trace Metals In Sediments Under Oxygen-Depleted Marine Environments
MINERALS(2020)
摘要
Organic- and sulfide-rich sediments have formed in oxygen-depleted environments throughout Earth's history. The fact that they are generally enriched in redox-sensitive elements reflects the sedimentary environment at the time of deposition. Although the modern ocean is well oxidized, oxygen depletion occurs in certain areas such as restricted basins and high-productivity zones. We measured bulk chemical compositions (major and trace elements, total organic carbon, and total sulfur) of organic- and sulfide-rich sediments collected from eight areas having oxygen-depleted water to discuss relationships between geochemical features and sedimentary environments. Major elemental compositions generally show mixtures of terrigenous detritus and biogenic carbonate. Some redox-sensitive elements might be controlled by organic matter content, whereas others could be contained in sulfide minerals in sediments. In particular, Mo and U show a characteristic trend; areas with higher Mo and U-at least partially owing to a depositional process called the "particulate shuttle"-generally correspond to regions influenced by the open ocean. In contrast, areas with lower Mo and U are more restricted marine environments. This suggests that the degree of Mo and U enrichment reflects the geography in terms of proximity to the open ocean, or the degree of the supply of these elements from the open ocean.
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关键词
sediment geochemistry, oxygen-depleted conditions, redox-sensitive elements, organic-rich sediment, Deep Sea Drilling Project, Ocean Drilling Program, International Ocean Discovery Program
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