?k/X a .3 ] 1-῏10 ,**0 Japanese Journal of Structural Geology, No. .3, 1-῏10, ,**0/0

Internal furnace for the gas-medium high-pressureand high-temperature apparatus at the Geological
Survey of Japan/AIST.

*ῌ**ῌ **
Koji Masuda*, Kenichi Iryo**, and Akira Ogura**
Key Words : gas-medium apparatus, internal furnace,high-pressure, high-temperature

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and Tullis, +320 ; 67ῌ8j ,**.( 9Bu C-9 4 %mh1/D_  a ,**/ { 2 » ,0 |}g(*  /X0YZ[ /X~C
Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial
Science and Technology, Ibaraki -*/῏2/01, Japan** ῌ9
SE Co. Ltd.

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Fig. +Internal furnace for the gas-medium apparatus of theGeological Survey of Japan/AIST. (a) A ceramics tube andheater coils (two-zone furnace). (b) A heater case (photo). (c) Aheater case (drawing).

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^Y<(rHJ#+ ) o&'k*pI+ :Schematic illustration of the internal furnace and sample assembly. The whole assembly ﬁts inside the pressure
Fig. ,vessel. The system is designed to handle a cylindrical sample of max. /* mm length and ,* mm diameter. A *.,/ mmthick annealed copper jacket isolates the specimen from the argon-gas conﬁning medium. Tungsten carbide (WC) spacers
minimize the temperature gradient across the sample. Alumina spacers prevent excess heat from escaping through theends of the column. T+, T,, TC+, TC,, and TC- are locations of the thermocouples. The gap between the upper furnace
bore and the copper jacket is ﬁlled with insulating materials that serve to restrict convection of the argon gas.

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Fig. - (a) Temperatures measured inside and around the internal furnace as a function of time.
(b) Fluctuation of temperatures at the top of the sample (T+) and at the bottom of the sample (T,)
during the period c when we kept the temperature at 2**_ under the conﬁning pressure of ,**MPa. Positions of the thermocouples (T+, T,, TC+, TC,, and TC-) are shown in Fig. ,.

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L BGH) F«¬ L­® ¤¯,V@ V:¡UF'3s)ῐMasuda, K., Fujimoto, K. and Arai, T., ,**,, A newgas-medium, high-pressure and high-temperature deformation apparatus at AIST, Japan.
Earth Planets Space, /., +*3+ῌ+*3..
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°±²³ῌ ,**. tO8u7;78"#vwH45´"#) ¸*¹ no.
.2 ,/ῌ-*.
Paterson, M.S., +31*, A high-pressure, high-temperature apparatus for rock deformation. Int. Jour.
Rock Mech. Min. Sci., 1, /+1ῌ/,0.
Paterson, M.S., +33*, Rock deformation experimentation. In Duba, A.G., Durham, W.B., Handin,J.W. and Wang, H.F., eds., The Brittle-Ductile
Transition in Rocks, The Heard Volume, Geophysical Monograph /0, Amer. Geophys. Union, +21ῌ+3..
Tullis, T. and Tullis, J., +320, Experimental rockdeformation techniques, In Hobbs, B.E. andHeard, H.C., eds., Mineral and Rock Deformation : Laboratory Studies, The Paterson Volume,Geophysical Monograph -0, Amer. Geophys.
Union, ,31ῌ-,..
Wibberley, C.A. J. and Shimamoto, T., ,**-, Internal
structure and permeability of major strike-slip
fault zones : the Median Tectonic Line in Mie
Prefecture, Southwest Japan. Jour. Struct. Geol.,,/, /3ῌ12.

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