 x .2  ,/ῌ-* ,**. &Japanese Journal of Structural Geology, No. .2, ,/ῌ-*, ,**.(%&

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Experimental studies of fracture and friction
with gas-medium high-pressure and high-temperature apparatus

*ῌ*, **Koji Masuda* and Takashi Arai*, **Key Words : gas-medium apparatus, fracture, friction, high-pressure, high-temperature !
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*  ONOP QOq ~TNOInstitute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial
Science and Technology** @ : M] e National Institute of Technology and Evaluation

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and Tullis, +320 C()DEQSabc FGf#}~H; I2 # tJKLENOabS|d e#f12 ~abS|d e#M$%.$#Nkk<%)  ONOPQOq &Masuda et al., ,**,( WRSK  JK k ! , e - e#M12 @ ~ - eabS|d e# %) "2J }~abS|d e H; xy ῌ 8SῌSC$K3 , :2 %)ET t  ,-%#Dl  abS|d e$D45&QS3k /**u UR>%L( > V9 # :%!kWX ONOP ,-%t#9Y Zῌ[:%)"#$"\ \:%6 %:) "W+ ,-%7]2]
:%/  * QRQS3 ,-%# ῌ r¡ ^J-2¢J
# \2J ><*_J2 )£> `* abc> d_ef> :;]2
C ῌ r¡  ""abS|d e¤ QRQS453VJ_J26£> :%>:)Masuda et al. &,**-(  QRQS3¥s¦s§S¨7V ¤) g h© %]ª+&ij«klV¬"(­®¥s¦s§d< m¯ +0 mm n1 .* mm °o7 N7 Vc;) 7pc> +*±/./ῌs,R>qRJ0**u **<%+,&Wet(*+, &Dry( S¨7V ¤)Dry +,8S +-* MPa, Wet +,8S ,**MPa k*S 1* MPa  rB+,s²
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Lockner et al. +320# P Chester +33.#  VG ¡P¢ ¡ £%64]^F%  =¤¥¦f^§/4J]^F%
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a³b´µmssῌµln V#Fig. ,The experimentally observed frictional response
to a suddenly imposed increase and then decrease insliding velocity (V). In this case, a-b¶*.

Strength of mylonite samples as a function ofFig. +temperature.

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Sample and furnace conﬁguration for frictional
Fig. experiments.

Fig. .
The friction parameter b for dry and wet feldspar gouge. Sliding velocity was changed from *./ mm/s
to /.* mm/s. Evolution e#ect b is sensitive to presenceof water.

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#6q 89:  jk$f rstuv%w:1  ,- /01 &'nDEF x":J1 .myz/RKanagawa et al., ,***, Karner et al., +331 {S  jk.o :| $fn .m }~ :f
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A (6 :±(%&Fig. /The friction parameter (a-b) for wet quartz gougeplotted against temperature.

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SEM images for the feldspar gouge after the friction experiments at 0**+ under the dry (right) andFig. 0wet (left) conditions. Bar scales are /mm.

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