DEVELOPMENT OF HIGH-RESOLUTION ELEMENTAL ANALYSIS APPROACH FOR COASTAL SETTINGS: COLOR LINE SCANNING, SCANNING X-RAY FLUORESCENCE AND SCANNING LASER-ABLATION INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY
This variability in sediment deposition provides very distinctive sediment sources with distinctive elemental signatures. Cores were analyzed using a color line scanner (sub-mm resolution), as well as scanning XRF (X-ray Fluorescence) with mm-scale resolution and sections of the cores were analyzed by scanning LA-ICP-MS (Laser Ablation Inductively Couple Mass Spectrometry) with micon-scale resolution. This provided a high-resolution elemental record that could discriminate individual laminations/sedimentation events. Each data set was processed to determine the most indicative elements and elemental ratios for each sediment source. Development of an approach to elemental analysis specific for coastal settings is necessary for accurate interpretation of elemental records from sediment cores in coastal settings. This will aid in measuring variability in depositional process (runoff/rainfall, overwash/tropical cyclones and/or tsunamis) on annual to decadal-scale resolution.