Variations in the thermal conductivities of surface sediments in the Nankai subduction zone off Tokai, central Japan

Marine Geophysical Researches - Tập 33 - Trang 269-283 - 2012
Shusaku Goto1, Tomonobu Mizoguchi2, Ryo Kimura3, Masataka Kinoshita4,5, Makoto Yamano6, Hideki Hamamoto7
1Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
2System Intech Co., Ltd., Tokyo, Japan
3Global Ocean Development Inc., Yokohama, Japan
4Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
5Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Kochi, Japan
6Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
7Center for Environmental Science in Saitama, Saitama, Japan

Tóm tắt

We investigated the relationship between variations in the thermal conductivity of surface sediments and the topography in the Nankai subduction zone off Tokai, central Japan, the easternmost part of the Nankai subduction zone, which has an accretionary prism with varied topography. We analyzed sediment thermal conductivity data obtained from the trough floor and accretionary prism. Variations in the thermal conductivity of sediments were related to the topographic features formed by accretionary prism development. Thermal conductivities of 1.1 W/m K were measured on the trough floor where thick terrigenous turbidites have been deposited. The thermal conductivity of Nankai Trough floor sediments decreases from northeast to southwest along the trough, probably because of the decreased grain size and/or changes in sediment mineral composition. High thermal conductivities (≥1.0 W/m K) were measured in fault scarps on the accretionary prism. A landward increase in these values on the prism may be explained by decreased porosity of the sediments attributable to tectonic deformation during accretionary prism development. At the base of the fault scarp of the frontal thrust, low thermal conductivities (<0.9 W/m K) were measured, likely reflecting the high porosity of the talus deposits. Low thermal conductivity (0.9 W/m K) was also measured in slope basins on the accretionary prism, likely also related to the high porosity of the sediments. Our results demonstrate that, for accurate heat flow measurement in an area of varied topography, the geothermal gradient and the thermal conductivity of the sediments must be measured within regions with similar topographic features.

Tài liệu tham khảo

Arai K (2008) Geological map of Enshu Nada, geology map series, no. 65 (CD). Geological Survey of Japan, AIST (in Japanese with English abstract) Bangs NL, Shipley TH, Gulick SPS, Moore GF, Kuromoto S, Nakamura Y (2004) Evolution of the Nankai Trough decollement from the trench into the seismogenic zone: inferences from three-dimensional seismic reflection imaging. Geology 32:273–276 Becker K, Von Herzen RP, Kirklin J, Evans R, Kadko D, Kinoshita M, Matsubayashi O, Mills R, Schultz A, Rona PA (1996) Conductive heat flow at the TAG active hydrothermal mound: results from 1993–1995 submersible surveys. Geophys Res Lett 23:3463–3466 Beziat A, Dardaine M, Mouche E (1992) Measurements of the thermal conductivity of clay–sand and clay–graphite mixtures used as engineered barriers for high-level radioactive waste disposal. Appl Clay Sci 6:245–263 Blum P (1997) Physical properties handbook: a guide to the shipboard measurement of physical properties of deep-sea cores. ODP Tech Note 26. http://www-odp.tamu.edu/publications/tnotes/tn26/INDEX.HTM Brigaud F, Vasseur G (1989) Mineralogy, porosity and fluid control on thermal conductivity of sedimentary rocks. Geophys J 98:525–542 Carslaw HS, Jaeger JC (1959) Conduction of heat in solids, 2nd edn. Oxford University Press, London Chamot-Rooke N, Renard V, Le Pichon X (1987) Magnetic anomalies in the Shikoku Basin: a new interpretation. Earth Planet Sci Lett 83:214–228 Cochonat P, Cadet JP, Lallemant SJ, Mazzotti S, Nouzé H, Fouchet C, Foucher JP (2002) Slope instabilities and gravity processes in fluid migration and tectonically active environment in the eastern Nankai accretionary wedge (Kaiko–Tokai ‘96 cruise). Mar Geol 187:193–202 Davis EE, Chapman DS, Villinger H, Robinson S, Grigel J, Rosenberger A, Pribnow D (1997) Seafloor heat flow on the eastern flank of the Juan de Fuca Ridge: data from the ‘‘FlankFlux’’ studies through 1995. In: Proceedings of the ODP, initial reports, 168. Ocean Drilling Program, Texas A&M University, College Station, TX, pp 23–33 Goto S, Matsubayashi O (2008) Inversion of needle-probe data for sediment thermal properties of the eastern flank of the Juan de Fuca Ridge. J Geophys Res 113:B08105. doi:10.1029/2007JB005119 Goto S, Matsubayashi O (2009) Relations between the thermal properties and porosity of sediments in the eastern flank of the Juan de Fuca Ridge. Earth Planets Space 61:863–870 Grevemeyer I, Kaul N, Kopf A (2009) Heat flow anomalies in the Gulf of Cadiz and off Cape San Vincente, Portugal. Mar Petrol Geol 26:795–804 Gulick SPS, Bangs NLB, Shipley TH, Nakamura Y, Moore G, Kuramoto S (2004) Three-dimensional architecture of the Nankai accretionary prism’s imbricate thrust zone off Cape Muroto, Japan: prism reconstruction via en echelon thrust propagation. J Geophys Res 109:B02105. doi:10.1029/2003JB002654 Hamamoto H, Yamano M, Goto S, Kinoshita M, Fujino K, Wang K (2011) Heat flow distribution and thermal structure of the Nankai subduction zone off Kii Peninsula. Geochem Geophys Geosyst 12:Q0AD20. doi:10.1029/2011GC003623 Harris RN, Grevemeyer I, Ranero CR, Villinger H, Barckhausen U, Henke T, Mueller C, Neben S (2010) Thermal regime of the Costa Rican convergent margin: 1. Along-strike variations in heat flow from probe measurements and estimated from bottom-simulating reflectors. Geochem Geophys Geosyst 11:Q12S28. doi:10.1029/2010GC003272 Hartmann A, Villinger H (2002) Inversion of marine heat flow measurements by expansion of the temperature decay function. Geophys J Int 148:628–636 Henry P, Foucher JP, Le Pichon X, Sibuet M, Kobayashi K, Tarits P, Chamot-Rooke N, Furuta T, Schultheiss P (1992) Interpretation of temperature measurements from the Kaiko–Nankai cruise: modeling of fluid flow in clam colonies. Earth Planet Sci Lett 109:355–371 Henry P, Lallemant S, Nakamura K, Tsunogai U, Mazzotti S, Kobayashi K (2002) Surface expression of fluid venting at the toe of the Nankai wedge and implications for flow paths. Mar Geol 187:119–143 Horai K (1971) Thermal conductivity of rock-forming minerals. J Geophys Res 76:1278–1308 Horai K, Simmons G (1969) Thermal conductivity of rock-forming minerals. Earth Planet Sci Lett 6:359–368 Hyndman RD, Davis EE, Wright JA (1979) The measurement of marine geothermal heat flow by a multipenetration probe with digital acoustic telemetry and in situ thermal conductivity. Mar Geophys Res 4:181–205 Ikehara K (2001) Recurrence interval of large earthquakes along the eastern Nankai Trough inferred from deep-sea turbidites. J Geogr (Chigaku Zasshi) 110:471–478 (in Japanese with English abstract) Jaeger JC (1956) Conduction of heat in an infinite region bounded internally by a circular cylinder of a perfect conductor. Aust J Phys 9:167–179 Kaul N, Foucher JP, Heesemann M (2006) Estimating mud expulsion rates from temperature measurements on Håkon Mosby Mud Volcano, SW Barents Sea. Mar Geol 229:1–14 Kawamura K, Ogawa Y, Anma R, Yokoyama S, Kawakami S, Dilek Y, Moore GF, Hirano S, Yamaguchi A, Sasaki T, YK05-08 Leg 2 and YK06-02 Shipboard Scientific Parties (2009) Structural architecture and active deformation of the Nankai Accretionary Prism, Japan: submersible survey results from the Tenryu Submarine Canyon. Geol Soc Am Bull 121:1629–1646 Kaye GWC, Laby TH (1986) Tables of physical and chemical constants and some mathematical functions, 15th edn. Longman, London Kinoshita M, Yamano M (1995) Heat flow distribution in the Nankai Trough region. In: Tokuyama H, Shcheka S, Isezaki N, Vysotskiy S, Kulinich R, Karp B, Lelikov E, Fujioka K, Liu G (eds) Geology and geophysics of the Philippine Sea. Terra Scientific Publishing Company, Tokyo, pp 77–86 Kinoshita M, Kanamatsu T, Kawamura K, Shibata T, Hamamoto H, Fujino K (2008) Heat flow distribution on the floor of Nankai Trough off Kumano and implications for the geothermal regime of subducting sediments. JAMSTEC Rep Res Dev 8:13–28 Kobayashi K (2002) Tectonic significance of the cold seepage zones in the eastern Nankai accretionary wedge—an outcome of the 15 years’ KAIKO projects. Mar Geol 187:3–30 Lallemand SE, Glaçon G, Lauriat-Rage A, Fiala-Médioni A, Cadet JP, Beck C, Sibuet M, Iiyama JT, Sakai H, Taira A (1992) Seafloor manifestations of fluid seepage at the top of a 2000-metre-deep ridge in the eastern Nankai accretionary wedge: long-lived venting and tectonic implications. Earth Planet Sci Lett 109:333–346 Le Pichon X, Kobayashi K, Cadet JP, Iiyama T, Nakamura K, Pautot G, Renard V, the Kaiko Scientific Crew (1987) Project Kaiko—introduction. Earth Planet Sci Lett 83:183–185 Le Pichon X, Kobayashi K, Kaiko–Nankai Scientific Crew (1992) Fluid venting activity within the eastern Nankai trough accretionary wedge: a summary of the 1989 Kaiko–Nankai results. Earth Planet Sci Lett 109:303–318 Lister CRB (1979) The pulse-probe method of conductivity measurement. Geophys J R Astr Soc 57:451–461 Lucazeau F, Bonneville A, Escartin J, Von Herzen RP, Gouze P, Carton H, Cannat M, Vidal V, Adam C (2006) Heat flow variations on a slowly accreting ridge: constraints on the hydrothermal and conductive cooling for the Lucky Strike segment (Mid-Atlantic Ridge, 37°N). Geochem Geophys Geosyst 7:Q07011. doi:10.1029/2005GC001178 Martin V, Henry P, Nouzé H, Noble M, Ashi J, Pascal G (2004) Erosion and sedimentation as processes controlling the BSR-derived heat flow on the Eastern Nankai margin. Earth Planet Sci Lett 222:131–144 Mazzotti S, Lallemant SJ, Henry P, Le Pichon X, Tokuyama H, Takahashi N (2002) Intraplate shortening and underthrusting of a large basement ridge in the eastern Nankai subduction zone. Mar Geol 187:63–88 Midttømme K, Roaldset E (1998) The effect of grain size on thermal conductivity of quartz sands and silts. Petrol Geosci 4:165–172 Moore GF, Taira A, Klaus A, Becker L, Boeckel B, Cragg BA, Dean A, Fergusson CL, Henry P, Hirano S, Hisamitsu T, Hunze S, Kastner M, Maltman AJ, Morgan JK, Murakami Y, Saffer DM, Sánchez-Gómez M, Screaton EJ, Smith DC, Spivack AJ, Steurer J, Tobin HJ, Ujiie K, Underwood MB, Wilson M (2001) New insights into deformation and fluid flow processes in the Nankai Trough accretionary prism: Results of Ocean Drilling Program Leg 190. Geochem Geophys Geosyst 2. doi:10.129/2001GC000166 Moore GF, Park JO, Bangs NL, Gulick SP, Tobin HJ, Nakamura Y, Sato S, Tsuji T, Yoro T, Tanaka H, Uraki S, Kido Y, Sanada Y, Kuramoto S, Taira A (2009) Structural and seismic stratigraphic framework of the NanTroSEIZE Stage 1 transect. In: Kinoshita M, Tobin H, Ashi J, Kimura G, Lallemant S, Screaton EJ, Curewitz D, Masago H, Moe KT, the Expedition 314/315/316 Scientists (eds) Proceedings of IODP, 314/315/316. Integrated Ocean Drilling Program Management International, Inc., Washington, DC. doi:10.2204/iodp.proc.314315316.102.2009 Nagihara S, Lister CRB (1993) Accuracy of marine heat-flow instrumentation: numerical studies on the effects of probe construction and the data reduction scheme. Geophys J Int 112:161–177 Okino K, Shimakawa Y, Nagaoka S (1994) Evolution of the Shikoku Basin. J Geomag Geoelectr 46:463–479 Ratcliffe EH (1960) The thermal conductivities of ocean sediments. J Geophys Res 65:1535–1541 Shyu CT, Hsu SK, Liu CS (1998) Heat flows off southwest Taiwan: measurements over mud diapirs and estimated from bottom simulating reflectors. Terr Atmos Ocean Sci 9:795–812 Soh W, Tokuyama H (2002) Rejuvenation of submarine canyon associated with ridge subduction, Tenryu Canyon, off Tokai, central Japan. Mar Geol 187:203–220 Taira A, Niitsuma N (1986) Turbidite sedimentation in the Nankai Trough as interpreted from magnetic fabric, grain size, and detrital modal analyses. In: Kagami H, Karig DE, Coulbourn WT (eds) Initial reports of the DSDP, 87. United States Government Printing Office, Washington, pp 611–632 The Research Group for Active Submarine Faults Off Tokai (1999) Active submarine faults off Tokai—results from the Japan–France KAIKO–Tokai project. University of Tokyo Press, Tokyo (in Japanese with English summary) Tsunogai U, Yoshida N, Gamo T (2002) Carbon isotopic evidence of methane oxidation through sulfate reduction in sediment beneath cold seep vents on the seafloor at Nankai Trough. Mar Geol 187:145–160 Vacquier V, Uyeda S, Yasui M, Sclater J, Corry C, Watanabe T (1966) Studies of the thermal state of the earth. The 19th paper: heat-flow measurements in the northwestern Pacific. Bull Earthq Res Inst 44:1519–1535 Villinger H, Davis EE (1987) A new reduction algorithm for marine heat flow measurements. J Geophys Res 92:12846–12856 Von Herzen RP, Maxwell AE (1959) The measurement of thermal conductivity of deep-sea sediments by a needle-probe method. J Geophys Res 64:1557–1563 Yamano M, Kinoshita M, Goto S, Matsubayashi O (2003) Extremely high heat flow anomaly in the middle part of the Nankai Trough. Phys Chem Earth 28:487–497 Yamano M, Kinoshita M, Goto S (2008) High heat flow anomalies on an old oceanic plate observed seaward of the Japan Trench. Int J Earth Sci 97:345–352 Yasui M, Kishii T, Watanabe T, Uyeda S (1966) Studies of the thermal state of the earth. The 18th paper: terrestrial heat flow in the Japan Sea (2). Bull Earthq Res Inst 44:1501–1518 Zühlsdorff L, Hutnak M, Fisher AT, Spiess V, Davis EE, Nedimovic M, Carbotte S, Villinger H, Becker K (2005) Site surveys related to IODP Expedition 301: ImageFlux (SO149) and RetroFlux (TN116) expeditions and earlier studies. In: Fisher AT, Urabe T, Klaus A, the Expedition 301 Scientists (eds) Proceedings of the IODP, 301. Integrated Ocean Drilling Program Management International, Inc., College Station, TX. doi:10.2204/iodp.proc.301.102.2005