****************************************************************************************************************

$BBh(B 69 $B2s(B $BBg5$3$MN7wJ*M}7O%;%_%J!<(B $B$N$*$7$i$;(B

$BF|!!;~!'(B1999$BG/(B 6$B7n(B 24$BF|(B($BLZ(B) $B8aA0(B 9:30 $B!A(B 12:00
$B>l!!=j!'(B$BCO5e4D6-2J3X8&5f2J4IM}Eo(B 2F $B9VF2(B

$BH/I=$B;3Cf(B $B9/M5(B ($B5$8u%b%G%j%s%09V:B(B $B=u65 $BBj!!L\!'(B$B%b%G%k$K$h$kGr0!5*$K$*$1$k3$MNL5;@AG;vJQ$N:F8=(B

****************************************************************************************************************

$B%b%G%k$K$h$kGr0!5*$K$*$1$k3$MNL5;@AG;vJQ$N:F8=(B ($B;3Cf(B $B9/M5(B ) $BH/I=MW;]!'(B

 $B8=:_(B, $B6K0h$GNd5Q$5$lI=AX?e29$,Dc$/$J$j(B, $BD@$_9~$s$G?xH/$7I=AX1vJ,$,9b$/(B 
 $B$J$j(B, $BD@$_9~$s$G?Z5r$,$"$k(B.  
 $B$^$?(B, $B9u?'$NM-5!J*$KIY$s$@Gv$$uBV$K$J$C$F$$$?$H9M$($i$l$k$3$H$+$i(B, $B3$MNL5;@AG(B 
 $B;vJQ(B(oceanic anoxic event, OAE)$B$H8F$P$l$F$$$k(B. $B$=$N@.0x$K$O=t@b$"$k$,(B, 
 Herbert et al(1986)$B$O(B, $BBO@QJ*$r;~4V9bJ,2rG=(B($BLs(B4000$BG/(B)$B$G2r@O$9$k$3$H$K$h$C(B 
 $B$F(B, $BLs(B2$BK|G/4V3V$G4V7gE*$K3$MNL5;@AG>uBV$,B8:_$9$k$3$H(B, $B3$MNL5;@AG>uBV$N;~(B 
 $B4|$H3$MN@8J*@8;:$,Dc$$;~4|$,0lCW$9$k$3$H$r<($7(B, $B$5$i$K(B, $BF|2$,$J$$;~4|$K$I$N$h$&$J%a%+%K%:%`$G5/$3$k$N$+$O:#8e$N2]Bj$H$7(B 
 $B$?(B. 
   $B4JC1$J3$MN=[4D%b%G%k$HJ*o2r$H(B1$B$D$N<~4|2r$H$$$&(B3$B$D(B 
 $B$NMM<0$NG.1v=[4D$,F@$i$l$?(B. $B<~4|E*$JG.1v=[4D$N>l9g$K$O(B, $BCOZ5r$H@0(B 
 $B9gE*$J3$MNL5;@AG>uBV(B, $B3$MN@8J*@8;:(B, $B3$LL?e=`$N%_%i%s%3%S%C%A;~4V%9%1!<%k(B 
 $B$N<~4|E*>uBV$,F@$i$l$?(B. 

-----
$BO"Mm@h(B

$B?eED(B $B85B@(B $B!wKL3$F;Bg3XBg3X1!CO5e4D6-2J3X8&5f2J(B
$BBg5$3$MN@l96Bg=[4DNO3X9V:B(B
mail-to:mizuta@ees.hokudai.ac.jp / Tel: 011-706-2357