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Zeeden, Christian; Hilgen, Frederik J; Röhl, Ursula; Seelos, Klemens; Lourens, Lucas Joost (2015): Core scan image analysis corrected for cracks, ODP Hole 154-926C. PANGAEA,, Supplement to: Zeeden, C et al. (2015): Sediment color as a tool in cyclostratigraphy – a new application for improved data acquisition and correction from drill cores. Newsletters on Stratigraphy, 48(3), 277-285,

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Drill cores are essential for the study of deep-sea sediments and on-land sites because often no suitable outcrop is available or accessible. These cores form the backbone of stratigraphical studies using and combining various dating techniques. Cyclostratigraphy is usually based on fast and inexpensive measurements of physical sediment properties. One indirect but highly valuable proxy for reconstructing the sediment composition and variability is sediment color. However, cracks and other disturbances in sediment cores may dramatically influence the quality of color data retrieved either directly from photospectrometry or derived from core image analysis. Here we present simple but powerful algorithms to extract color data from core images, and focus on routines to exclude cracks from these images. Results are discussed using the example of an ODP core from the Ceara Rise in the Central Atlantic. The crack correction approach presented highly improves the quality of color data and allows the easy incorporation of cracked cores into studies based on core images. This facilitates the quick and inexpensive generation of large color datasets directly from quantified core images, for cyclostratigraphy and other purposes.
Latitude: 3.718830 * Longitude: -42.908400
Date/Time Start: 1994-02-25T19:00:00 * Date/Time End: 1994-02-27T16:00:00
Minimum Elevation: -3610.0 m * Maximum Elevation: -3610.0 m
154-926C * Latitude: 3.718830 * Longitude: -42.908400 * Date/Time Start: 1994-02-25T19:00:00 * Date/Time End: 1994-02-27T16:00:00 * Elevation: -3610.0 m * Penetration: 398.3 m * Recovery: 394.21 m * Location: North Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 42 cores; 397.8 m cored; 0 m drilled; 99.1 % recovery
High resolution image scanning was carried out employing a GEOTEK linescan imaging device (Geoscan) at the MARUM, University of Bremen. Core surfaces were manually cleaned of mold and other visible contamination before scanning the half-cores without covering them with foil.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample code/labelSample labelZeeden, ChristianDSDP/ODP/IODP sample designation
2Greyscale valueGreyZeeden, ChristianMulti-Sensor Core Logger, GEOTEKof the original image
3Greyscale valueGreyZeeden, ChristianDeCrack routineresult A of the DeCrack routine
4Greyscale valueGreyZeeden, ChristianDeCrack routineresult B of the DeCrack routine
5Greyscale valueGreyZeeden, ChristianDeCrack routineresult C of the DeCrack routine
750 data points

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