Automatic image analysis of X-ray radiographs: a new method for ichnofabric evaluation |
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| Institution: | 1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou 510275, China;2. Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing 100875, China;3. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;4. Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;5. Department of Biological and Agricultural Engineering and Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, USA |
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| Abstract: | Automated ichnofabric analysis was performed on X-ray radiographs from five gravity cores retrieved from Late Quaternary sediments from the SW Portuguese continental slope. The image analysis program DIAna was used to detect and quantify the part of the ichnofabric consisting of pyritized microburrows, presumably Trichichnus and “Mycellia”. Abundance and orientation of the burrows were determined at 5-cm intervals. The results agree with manual counts of burrows in the coarse fraction of the sediment, and they indicate that the abundance of the pyritized burrows depends on enhanced organic carbon content, fine grain size, and low bottom water oxygenation. In contrast, no clear correlation between burrow orientation and environmental conditions was observed. |
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