HR: 0800h
AN: T51A-1321    [Abstracts]
TI: Characterization of Unfractured Wall Rocks of TCDP Hole-B by Combination of Thermal-Property and TDR Measurements in Laboratory
AU: * Matsubayashi, O
EM: matsubayashi-osamu@aist.go.jp
AF: National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tukuba, 305-8567 Japan
AU: Lin, W
EM: lin@jamstec.go.jp
AF: Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Hirono, T
EM: hirono@jamstec.go.jp
AF: Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Song, S
EM: srsong@ntu.edu.tw
AF: National Taiwan University, P.O.BOx 13-318, Taipei, 106 Taiwan
AU: Hung, J
EM: jhung@earth.ncu.edu.tw
AF: National Central University, 300 Jungda Rd, Chung-Li, 320 Taiwan
AB: As part of comprehensive studies of non-destructive physical properties of the cores from Hole-B drilled for the Taiwan Chelungpu-fault Drilling Project (TCDP), we have closely examined the data of combined thermal-property and TDR (water content) measurements which were carefully performed in laboratory. The purpose is to establish the bulk characteristics of thermal-properties in response to water content for the non-fractured part of the formations in TCDP Hole-B, so that we can properly assess the baseline thermal regime undisturbed by the thermal effect of fault activity. The sections studied in this work are unfractured parts of the cores (i) from 1142 to 1170m, and (ii) from 1200 to 1235m of Hole-B, which compose the wall rocks immediately below the fault zones of 1137m and 1194m depths, respectively. The instruments used were a transient type thermal-property analyzer with a half space probe for thermal conductivity, and a parallel-rod sensor probe for TDR water content, both are commercially available. Measured value of thermal conductivity ranges from 2.2 to 3.7 W/mK, while TDR water content value covers the approximate range of 15 to 26 percent. It is found by a correlation plot of thermal conductivity (Lamda) vs. water content (w) that within each section there is a very good negative correlation between the two for most of the good quality measurements, indicating thermal conductivity being primarily controlled by the volume ratio of solid grain to interstitial water. Such a relationship is reasonable and would be very useful in evaluation of thermal-properties of the whole section along the drillhole, and also for estimating the thermal-properties of fault zones in particular, which is always difficult to measure directly due to practical constrains.
DE: 8102 Continental contractional orogenic belts and inversion tectonics
DE: 8130 Heat generation and transport
DE: 8150 Plate boundary: general (3040)
SC: Tectonophysics [T]
MN: Fall Meeting 2005