Shirai, Masaaki et al. (2007): Data report; descriptive evaluation of consolidated sedimentary rock structures with X-ray imaging; examples from Site 1276 core samples

ODP 210
ODP 210 1276


Shirai, Masaaki
University of Tokyo, Ocean Research Institute, Tokyo, Japan

Nishimura, Masahiro
IFREMER Centre de Brest, France

Yasuda, Hisato
Ocean Drilling Program, United States

Data report; descriptive evaluation of consolidated sedimentary rock structures with X-ray imaging; examples from Site 1276 core samples
In: Tucholke, Brian E., Sibuet, Jean-Claude, Klaus, Adam, Arnaboldi, Michela, Delius, Heike, Engstrom, Anna V., Galbrun, Bruno, Gardin, Silvia, Hiscott, Richard N., Karner, Garry D., Ladner, Bryan C., Leckie, R. Mark, Lee, Chao-Shing, Manatschal, Gianreto, Marsaglia, Kathleen M., Pletsch, Thomas K., Pross, Joerg, Robertson, Alastair H. F., Sawyer, Dale S., Sawyer, Derek E., Shillington, Donna J., Shirai, Masaaki, Shryane, Therese, Stant, Sharon Audra, Takata, Hiroyuki, Urquhart, Elspeth, Wilson, Chris, Zhao, Xixi, Proceedings of the Ocean Drilling Program; scientific results; drilling the Newfoundland half of the Newfoundland-Iberia transect; the first conjugate margin drilling in a nonvolcanic rift; covering Leg 210 of the cruises of the Drilling Vessel JOIDES Resolution; St. Georges, Bermuda, to St. John's, Newfoundland; sites 1276 and 1277; 6 July-6 September 2003
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
In order to evaluate X-ray imaging efficacy for observation and description of sedimentary structures in consolidated sedimentary rocks with a computed tomography (CT) scanner, X-ray images obtained during the Ocean Drilling Program Leg 210 cruise and X-ray CT images obtained during postcruise study are compared with split surface digital images of the correlative half-core. Sedimentary structures are clearly to faintly recognized with X-ray images, implying that sedimentary rocks (sandstone, siltstone, and shale) retain density contrasts despite decreases in porosity caused by compaction. X-ray imaging is efficient for observing partial sedimentary and postsedimentation structures. However, carbonate rocks tend to be unsuitable for X-ray imaging and observation because whole-core cementation often masks density contrasts, rendering homogeneous sedimentary structures. Overlap of high-angle structures often prevents clear two-dimensional imaging. X-ray CT scanning is a powerful tool that can image structures in sedimentary rock core samples before they are split. Constructing an efficient X-ray CT imaging methodology to be used during the time constraining the core description process is required.
Coverage:Geographic coordinates:
West:-44.4700East: -44.4700

Sedimentary petrology; Atlantic Ocean; Canada; cementation; clastic rocks; computed tomography; concretions; continental margin; cores; diagenesis; Eastern Canada; Flemish Cap; Grand Banks; imagery; laminations; Leg 210; Newfoundland; Newfoundland and Labrador; North Atlantic; Northwest Atlantic; Ocean Drilling Program; ODP Site 1276; planar bedding structures; secondary structures; sedimentary rocks; sedimentary structures; soft sediment deformation; tomography; X-ray data;