[BCG09-P14] Geochemical characterization of modern black mud by Independent Component Analysis
Keywords:redox sensitive metals, black mud, black shale, Independent Component Analysis
In the modern ocean, black mud that is enriched in organic carbon and/or sulfides deposits in certain sea areas associated with an oxygen-depleted water mass, such as a silled basin or an upwelling area. These black muds likely constitute comparable counterparts of the ancient black shales. Therefore, to characterize the geochemical features of these black muds may provide a new insight into the past oceanic environmental changes.
In this study, we determined contents of major and trace elements, total organic carbon (TOC), and total sulfur (TS) of black mud and shale samples collected from a variety of geographic conditions and redox states in the water mass. In order to characterize the geochemistry of black mud and shale, we also applied Independent Component Analysis to the multi-elemental data set. We will present the analytical result and discuss its implications for the oceanic environmental changes.