Thermal conductivities under high pressure in core samples from IODP NanTroSEIZE drilling site C0001

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doi: 10.1029/2010GC003449
Author(s): Lin, Weiren; Tadai, Osamu; Hirose, Takehiro; Tanikawa, Wataru; Takahashi, Manabu; Mukoyoshi, Hideki; Kinoshita, Masataka
Author Affiliation(s): Primary:
Japan Agency for Marine-Earth Science and Technology, Kochi Institute for Core Sample Research, Nankoku, Japan
Other:
Marine Works Japan, Japan
National Institute of Industrial Science and Technology, Japan
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, Vol.12. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 45 refs.; illus., incl. sketch map
Summary: We examined the effects of high pressure on thermal conductivity in core samples from the slope-apron facies and the upper part of the accretionary prism at site C0001 of the NanTroSEIZE drilling program and in other samples of five terrestrial rock types. Thermal conductivity clearly increased with increasing pressure for both wet (water saturated) and dry samples. We determined the rate of thermal conductivity change of the NanTroSEIZE sediments to be 0.014 Wm-1K-1/MPa when pressure was increased, and 0.01 Wm-1K-1/MPa when pressure was decreased. Using the rate determined for decreasing pressure, we estimated that thermal conductivities measured at atmospheric pressure rather than at in situ pressure may be underestimated by 7% for a core sample from around 1 km depth and by 20% for a core sample from around 3 km depth. In general, the rate of thermal conductivity change with pressure showed a positive correlation with porosity. However, the relationship of the rate of thermal conductivity change to porosity is also dependent on the fabric, mineral composition, and pore structure of the sediments and rocks. Furthermore, for two sandstones we tested, the effect of pressure on thermal conductivity for dry samples was greater than that for wet samples.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Accretionary wedges; Boreholes; Cores; Decollement; Heat flow; High pressure; IODP Site C0001; Instruments; Integrated Ocean Drilling Program; Marine geology; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; Pressure; Saturated materials; Subduction zones; Techniques; Thermal conductivity; West Pacific
Coordinates: N331400 N331400 E1364300 E1364300
N325000 N333000 E1370000 E1362000
Record ID: 2013046512
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