Petrophysically determined lithofacies at the Nankai Trough accretionary prism; NanTroSEIZE, IODP Expedition 314

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doi: 10.1144/0016-76492008-136
Author(s): Tudge, J.; Lovell, M. A.; Davies, S. J.; Harvey, P. K.; Saito, S.
Integrated Ocean Drilling Program, Expedition 314 Scientists
Author Affiliation(s): Primary:
University of Leicester, Department of Geology, Leicester, United Kingdom
Japan Agency for Marine-Earth Science & Technology, Japan
Volume Title: Journal of the Geological Society of London
Source: Journal of the Geological Society of London, 166(5), p.961-968. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649 CODEN: JGSLAS
Note: In English. 10 refs.; illus., incl. sect., 1 table, geol. sketch map
Summary: Characterizing the physical properties and identifying boundaries within active accretionary prisms is necessary in understanding their behaviour and recent movement. In such unstable conditions core recovery is not always reliable, especially around fault zones. Integrated Ocean Drilling Program (IODP) Expedition 314 was the first stage of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), and used logging-while-drilling (LWD) technology to record continuous physical property data. We use iterative non-hierarchical cluster analysis (INCA) to quantitatively define the characteristics of the slope sediments and sediments within the accretionary prism at Sites C0001 and C0004. A new and detailed log-based lithostratigraphy is developed, and positions of major boundaries, defined by 3D seismic profiles and initial interpretation of log responses, are refined. The results produce clusters that clearly distinguish the slope sediments and characterize formations within the accretionary prism. Boundaries that correlate to the seismic-defined unconformity between the slope sediments and the accretionary prism, and a boundary within the accretionary prism that corresponds to a megasplay fault previously unresolved by log analysis and borehole images, are identified. Our study demonstrates that INCA analysis of LWD data can accurately define boundaries and characterize sediments in environments where core recovery may be incomplete.
Year of Publication: 2009
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Accretionary wedges; Cluster analysis; Cores; Expedition 314; Fault zones; Faults; IODP Site C0001; IODP Site C0004; Integrated Ocean Drilling Program; Lithofacies; Lithostratigraphy; NanTroSEIZE; Nankai Trough; Nankai Trough Seismogenic Zone Experiment; North Pacific; Northwest Pacific; Pacific Ocean; Physical properties; Resistivity; Sediments; Seismic logging; Statistical analysis; Unconformities; Well-logging; West Pacific
Coordinates: N331400 N331400 E1364300 E1364300
N331300 N331300 E1364300 E1364300
Record ID: 2009083400
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