1. 1000 0569/2011 /027( 02) 0433 50 A cta P etro log ica Sinica 岩石 学报
*
夏琼霞 郑永飞
X I Q iongX ia and ZHENG Y ongF e i
A
, , 230026
CAS K ey L abora tory of C rust M an tleM a terials and Env ironm en ts S ch ool of Earth and Space S cien ces U niversity of S cience and T echnology of Ch ina,
, ,
H ef ei 230026, Ch ina
2010 11 10 收稿, 2011 01 06 改回
X ia QX and Zheng YF 2011 The composition and ch e ical zon ing in garnet from h igh to u ltrah igh pressure m etam orph ic
m
rock s A cta Petrolog ica S in ica, 27( 2) : 433- 450
Abstrac t G arne t is comm on in eclog ite and gne iss of high pressure ( HP ) to u ltrah igh pressure ( UH P) m eta orph ic or ig in It can
m
be we ll preserved during subduc tion zone m eta orphism fo r its h igh re frac to riness and low so lubility in flu id and m e lt The che ica l
m m
composition and m ineral inc lusions preserv ed in garnet can be used to constra in the P T cond itions, m eta orph ic evo lution, and fluid
m
action T he che ica l composition o f garne t is re lated to m any factors such as who le rock co pos ition, P T conditions g arnet fo r ing
m , m , m
m eta o rph ic reactions and the asse blag e of coex isting m inerals T hus the m ajor e le ents trace e lem ents, oxygen iso topes m inera l
m m m , ,
inc lusions and the ir re lations in garnet should all be taken into accoun t when it is used to constra in the me ta orphic P T evo lu tion in
m
UHP m etamo rph ic rocks In add ition, in situ analyses o fU Pb isotopes and trace e lements in accesso ry m inera ls such as zircon and /o r
m onazite inc lusions in garne t can place a direct constra int on the ti e o f m eta orphic garne t grow th T hrough study ing the history of
m m
ga rnet gro th dur ing subduc tion zone m eta orphism, it can not on ly prov ide pe tro log ic and geochem ica l ev idence for the processes to
w m
produce garne t bear ing m eta o rph ic ro cks but also g ive c lues to the orig in o f garnet T hese a re ve ry i portant to the che ica l
m , m m
dyna ics o f subduction zone m eta o rph ism
m m
K ey word s G arnet H P /UHP m etamo rph is O r ig in; Chem ical zon ing Inclusions
; m; ;
在俯冲带 变质过程中, 石榴石是高压 超高压变质榴 辉岩和片麻 岩的常见 变质矿物 由于 石榴石具 有难熔 和流体
中的低溶解能力的特点, 通常可以很好地保存下来, 并且能够保留复杂的化学成 分环带, 以及不同 类型的矿 物或流体包 裹体,
为解释石榴石寄主岩石经历的 变质演化历史提供了重要信息 石榴子石的主微 量元素成分 受控于很多 因素, 如全岩成 分 变
质的温压条件 控制石榴子石形成的相关变质反应 与石 榴子石 共生的 矿物种 类和成 分等 因此, 在 利用石榴 石探讨 超高压
变质的演化历史时, 对石榴石进行系统 的主要 元素 微 量元素 氧 同位 素以 及矿物 包裹 体分析, 以 及相 互间的 成因 关系 同
时, 对石榴石中的锆石或独居石包裹体并进行原位 U Pb定 年和微 量元素分 析, 可以为 变质石 榴石的 形成时代 提供直 接的时
间制约 深入研究超高压变质岩中石榴 石的生长阶段, 不仅可以 为含石 榴石寄 主岩石 的变质 过程提 供岩石学 和地球 化学证
据, 而且对于理解石榴石的形成机制 生长规律及其变质化学动力学过程具有重要的科学意义
石榴石; 高压 /超 高压变质; 成因机制; 环带; 包裹体
P578 947
* 973 ( 2009CB825004 ) ( 40921002 41003014 ) .
: , , 1979 , , , E m ai:l qxxia ustc. edu cn
@ .

2. 434 A cta P etro log ica Sinica 岩石学报 2011, 27( 2)
1 X ray Austroalpine W lz ( 12F03)
( a) ( d) 12F03 X ; ( e) ( c) ( G aid ies et a l , 2008)
.
F ig 1 X ray m aps of a prog rade garnet porphy roblast of m etape lite 12F 03 from the W lz Comp lex in A ustroa lp ine basem ent
.
( a) ( d) X ray m aps of a gar et porphyrob last from samp le 12F03 Th e locat ion of the com positional prof ile A B as illu strated in ( c) is show n in ( e)
n ;
( m od ified after G aid ies e t al. , 2008)
( Spear
, 1993 M enard and Spear
; , 1993; G a id ies et al ,
.
2006) ,
1 引言 ,
S , ( Spear
and Se lverstone 1983; M enard and Spear 1993; A yres and
, ,
, , V ance 1997 Ca rsw e ll et al. ,
, ; 1997, 2000; Enam , 1998;
i
Cooke et al. , 2000; E scuder V iruete et al , 2000 K ing et al ,
. ; .
, ,
( Loo is et al. , 1985; Chakrabo rty
m 2004; K onrad Schm o lke et al. , 2006, 2008a ),
and G angu ly 1992 V ielzeuf et al , 2007),
, ; . ( L asaga and Jiang 1995; V ance 1995 G angu ly
, , ;
, et al. , 1996; G r iffin et al. , 1996; Perchuck et al. , 1999;
( O Br ien 1997; K ing et al. ,
, 2004; K onrad Schm olke et Po llington and Bax ter 2010),
,
al , 2006 Tong et al , 2007; Caddick et al. , 2010)
. ; . (H o lliste r 1966; Loom is and N i ick,
, m
, 1982; Cyg an and Lasaga 1982; Cherno ff and Car lson, 1997;
,
O B rien, 1999; Spea r and D anie, 2001)
l
,
, ,
( V ance and O N ions 1990; W ang et al ,
, . 1992; Park inson,
2000; Compagnon i and H iraji a 2001 Carswe ll et al. , 2003
m, ; ;
D av is andW h itney 2006; Cutts et al. , 2010)
,
2 石榴石的主要元素环带
,
( K onrad Schm olke et al. , 2007) , 2 1

3. 夏琼霞等: 高压 超高压变质岩石中石榴石的环带和成因 435
, X , Ca
( 1) ,
PT ( Spear et a1 , 1984; Enam , 1998) ,
i , H er ann and G reen ( 2001 )
m H er ann
m
( L asage, ( 2002) K2 O Ca M gO A l2 O 3 SiO2 H 2 O ( KCM ASH )
O
l983; Spea r and P arr ish, 1996; A yres and V ance, 1997; , Ca
Carlson and Schwarze 1997; O B rien, 1997; G anguly et al ,
, . , A uzanneau et al.
2000; K ohn, 2004; Spear 2004; Stor and Spear 2005
, m , ; ( 2006) H er
mann and G reen ( 2001)
, 2003 2005)
, , Na , ,
P T ( Spea r et al ,
. ,
1984; Spear 1993; Carswe ll et al. , 2000 K ing et al. , 2004;
, ; ,
K onrad Schm o lke et al. , 2006) ( )
, Mn , ( 2009)
, , , TH ERMO CA LC P T
( D ee r et al. , 1982; Spear 1993)
, H o llister ( 1966, , I (X Grs )
1969) Mn , P T 2 4~ 2 6G Pa 570 ~ 585 ;
Leake ( 1967) Mn II , PT
Mn Fe 1 9~ 2 4GP a 530~ 570 ,
, Ca
, ,
, Mg , Mn , ,
Ca ( Spear et al. , 1984; Mn
Enam , 1998; G hent 1998; Carswe ll et al. ,
i , 2000 Zhang et
; ; , ,
al , 2005a)
. , Ca Mn ,
( H er ann and G reen,
m 2001; ( K ohn 2003)
, ,
H er ann, 2002)
m Carsw ell et al. ( 2000) Mn ( > 650 ),
, , Fe M n M g
, ( T racy 1982)
,
, Ca , ,
, F e /M g Mn ( A nderson and O li p io
m ,
( 2005) , 1977; W oodsw orth 1977; Y ardley
, , 1977; D empster 1985;
,
M gO , M nO Carlson and Schwarze, 1997 C arlson
; , 2002 ) Ca rlson and
, CaO , Schw arze ( 1997) Car lson ( 2002) T ex is L lano
, 10~ 50 m , U p lift ,
, , Mn
,
, 0 5~ 1mm , Mn
, , Mn
, ,
, Mn
P T , ,
, ( , 600 ~ 750
2005) ( Spear 1991; Car lson and Schw arze 1997 Carlson, 2002 )
, , ;
, , CaO ,
, / ( O Br ien 1997 A renas et
, ;
, CaO al , 1997 )
. / ( R einecke
, 1998;
( G a idies et al. , 2006) , A uzanneau et al. Co pagnon i and H iraji a 2001)
m m , W ang and L iou ( 1991)
( 2006)

4. 436 A cta P etro log ica Sinica 岩石学报 2011, 27( 2)
,
,
( > 800 )
,
,
, ,
850~ 900 ,
,
, ( Chen e t a1 ,
1998) , Zhang et a l ( 2005b)
. 2 T o nshend D a
w m
, , Mn
( Fe/ ( 1mm ) ,
Mg ) , 3! ( W h itn ey and
> 900 4 1~ 4 5G Pa , S eaton, 2010)
900 , F ig 2
. EBSD photom icrog raph to show M n zon ing and
, structure o f a po lycrystal g arnet fro the T ownshend D a
m m
, samp le d istinct garne t cry sta ls
Each i age represents a d ifferent slice ( separated by 1mm ) of th e sam e
m
, cluster both s lices contain garnet 3
; , the on ly garnet common to both
slices ( mod if ied afterW h itn ey and Seaton 2010 )
,
( O B rien, 1997)
( EBSD )
( D anie l and Spear 1998; Sp iess et a l , 2001;
, .
W h itney et al. , 2008; W hitney and Seaton, 2010) ,
W h itney and Seaton ( 2010)
3 Mn ( 2),
,
Fe M n M g Ca
,
,
(W h itney and Seaton 2010)
,
3 K 92 12B ,
F allM ounta in
,
, G rt1 + G rt2,
( Spea r et al. , 1990; Spear and K ohn, 1996;
G rt4 G rt5 ( K ohn et a l , 1997)
.
K ohn et al. , 1997 P yle and Spear 1999, 2000 )
; ,
( F ig 3 E lectron m icroprobe trave rse ac ross garnet from sa ple
. m
) ( 3) , K 92 12B, show ing mu ltiple stag es of ga rnet gro th
w
18 V ert ical l ines separate areas correspond ing to G rt1 + G rt2, G rt4, and
, O ,
G rt5 ( modif ied afterK ohn e t al. , 1997)
,
( G rt1 + G rt2 )
1995) ( Py le and
( ),
Spear 1999)
, G rt3 ,
Ch l+ Q tz= G rt1 + H 2 O, B t+ Sil1 + Q tz= G rt2 + M s ,
Bt+ S il1 3 + P l+ Q tz= G rt3 + K fs+ m elt
,
Mn Fe M g (Ca )
,
G rt1 + G rt2 , Mn Fe M g
( Spear et al , 1990, 1995)
. G rt1 Cr ,
, M us+ P l+ Q tz
( G rt2 ), ( Spear et al ,
.
(M s+ P l+ Q tz= S il3 + m elt ∀ K fs)

5. 夏琼霞等: 高压 超高压变质岩石中石榴石的环带和成因 437
4 X ray VCA 7079 2 ( D ah lqu ist et al. , 2007)
F ig 4 X ray co positiona lm aps and spessa rtine inve rse be ll shaped zon ing pro files in t o ga rnets fro gran ite VCA 7079 ( after
. m w m
D ah lqu ist et al , 2007)
.
A bb reviations CZ= cen tral zon e I Z= in ter ed iate composit ional zone; M R Z= m argin al ri zone
: ; C m m
, Cr ( annuli) ,
, , 18
O ,
Cr ( Spear and K ohn, Ca G rt5 ,
1996; K ohn et al. , 1997 Spear et al , 1999)
; . ,
,
, K fs+ G rt2 3 + ( ) = Bt
+ S il4 + P l+ Q tz ( R eNTR, R e trog rade
2 2
N e t transfer R eactions) G rt3, Mn
,
,
( L eake 1967; M ann ing 1983 D eer et a l , 1992),
, , ; .
, [ S il1 4 + ( )
( L eake 1967 A llan and
, ;
∀ K fs= M s+ P l+ Q tz],
G rt4, B t+ S il1 4 + Q tz + P l= G rt4 + C la rke 1981; M ille r and Stoddard,
, 1981; du Bray, 1988;
M s G rt4 Mn , H og an, 1996; K ebede et al , 2001 D ahlquist et al. , 2007)
. ;
( Spea r et al ,
. ,
1990) G rt3 (M n ) G rt4 (M n ( du B ray 1988; V illa ros et al. , 2009) ,
,
), Mn ! ( hum p) ( Spear ,
et a l , 1990; K ohn et a l , 1997 )
. . ,

6. 438 A cta P etro log ica Sinica 岩石学报 2011, 27( 2)
( D ah lqu ist et al. , 2007) , du Bray ( 1988) ,
, ( ) M iller and Stoddard ( 1981) , Mn
(H abler et al. , 2007) , , M n /( F e
, + M g) # 0 04 , du Bray ( 1988) A rab ian Sh ie ld
,
M n /( F e+ M g ) # 0 04
, ,
, , ( L eake, D ah lqu ist et al. ( 2007)
1967; du Bray 1988; D ah lqu ist et a , 2007; V illaros et al ,
, . P e n R osado
2009) ( 4) , ,
, M n /( Fe+ M g )
, Mn
Fe Mg , Mn 2 3
, , ( )
, Mn Fe , ,
Y ard ley ( 1977) Spear ( C lechenko and V a lley 2003; D zigge l
,
( 1993) , , et al , 2009)
. ,
T < 640 ∀ 30 , Mn PT ( G arcia Casco et al ,
.
( Y ard ley, 1977; M ann ing, 1983 H arr ison,
; 2002),
1988); T > 700 ,Mn ( Jam tve it and A nderson, 1992)
,
, ( O rto leva et al. , 1987)
( D ay et al. , 1992) Setouch i ,
( K ano and Y ash i a
m, 1976; , ( Y ardley et al ,
.
K aw abata and T akafu j, 2005)
i 1991; Cro e et al. , 2001; C lechenko and V alley 2003; Sm ith
w ,
D ay et al ( 1992)
. et al , 2004)
. ( D zigge l et al. , 2009) ( 5)
, K ano and Y ash i a ( 1976)
m ,
K aw abata and T akafuji ( 2005) ,
( Ja tv eit et al. , 1993; Cro e et al ,
m w .
2001; C lechenko and V alley 2003)
,
, ,
( K a abata and T akafu j, 2005)
w i
,
< 500~ 700M P a ( G reen and R ing ood 1968;
w ,
G reen 1972 1992)
, ,
3 石榴石的微量元素环带
( Pa ti o Douce and ,
Johnson, 1991; Skjerlie and Johnston, 1993; V ie lzeuf and
M onte,l 1994) ( H ickm ott et al. , 1987
; H ickmo tt and Sh i izu,
m 1990;
Mn ( M iller et al. , 1981
; C lem ens and W al,l 1981, H ickm ott and Spear 1992; L anzirott, 1995; Spear and K ohn,
, i
1982), S P T fH 2O 1996; Cherno ff and Ca rlson 1999)
,
Mn , 200~ 600 Pa ( C lemens and
M , Mn
W a l, 1988)
l S Mn ,
, Strathbog ie , ,
( C rd) + ( Bt) ( Phillips et
al , 1981), V io let T own
. ,
( Crd) + ( O px ) ( C lemens and W a l, 1984)
l ( H ickm ott et al. , 1987 H ickmo tt and Sh i izu,
; m
G reen ( 1977) , , 1990; H ickm o tt and Spear
, 1992; Spear and K ohn, 1996;
Mn Cherno ff and C arlson 1999; O ta end i et al. , 2002 K on rad
, m ;

7. 夏琼霞等: 高压 超高压变质岩石中石榴石的环带和成因 439
5 N a ib ia
m N avachab Mn Ca X ( D zigge l et
al. , 2009)
F ig 5 The oscillatory zoning profiles and X ray composition maps o fM n and Ca in the garnet from the N avachab go ld depo sit in
.
N a ibia ( m od ified afte r D z iggel et al. , 2009)
m
Schmo lke et al. , 2008a) H ickm ott K ohn, 1996); ( 4) ,
, ( H ickmo tt and Sh i izu, 1990); ( 5)
m
( H ickmo tt ( H ickm ott et al. , 1987; X iao et
and Spear 1992),
, al , 2002); ( 6)
.
( H ickm ott and Sh i izu, 1990 ), P T
m ( H ickm ott et ( Schwandt et al , 1996);
.
al , 1987; H ickm ott and Spear 1992) ,
. , ( 7) ( Cherno ff
( H ickm ott et al. , 1992 H erv ig and Peacock, 1989)
; and Carlson, 1999) ,
, ( Jun
, and H ellenbrand, 2006 K onrad Schmo lke et al. , 2008a b)
; ,
( H ickm ott et al. , 1987 O B rien, 1997; K on rad Schmo lke et
;
al , 2008a b)
. , , Sm N d Lu H f Sm ( Y ang and R ivers 2002)
, ,
Lu , ,
( L apen et ,
al , 2003; K y lander C lark et al. , 2007 Cheng et al. , 2008,
. ; , ! ( H ickmo tt et al ,
.
2009a b, 2010, 2011)
, ( HREE ) 1987; Spear et al. , 1990; K ohn et al. , 1997; Py le and Spear
,
Y ( H ickm ott et al , 1987 Bea et al. , 1994;
. ; 1999) , ,
H er ann,
m 2002
; O tamend i et al ,
. 2002; R ubatto and ,
H er ann 2003 2007) ,
m , , , ,
, (M REE) (HR EE) Y !( 6)
( H ickmo tt and Shi izu 1990;
m ,
Lanziro tt, 1995; Chernoff and Car lson, 1999 O ta end iet al ,
i ; m . ( L anzirott,i 1995; Spea r and K ohn, 1996;
2002) , : ( 1) Py le and Spea r 1999; Chernoff and Carlson, 1999; Py le et al ,
, .
( L anz irott,i 1995); ( 2 ) 2001; Y ang and R ivers 2002),
,
( O ta endi et al , 2002); ( 3)
m . ( Chernoff and Carlson, 1999) ,
( H ickmo tt et al. , 1987; Spea r and P icuris Yb Y P Ti

8. 440 A cta P etro log ica Sinica 岩石学报 2011, 27( 2)
6
( Y ang and R ivers 2002)
,
F ig 6 A schem atic diag ra show ing the va riation o f ga rnet
. m
com patible and inco pa tible e le en ts formed by ga rnet
m m
resorp tion and subsequent reg row th ( m od ified a fter Y ang and
R ivers 2002)
,
Sc , Ca
, ,
; 7 V erpenesse t 714 3
, 4 ( a),
( Chernoff and Carlson, 1999) 4 ( b) ( K onrad
, Schm olke et al , 2008a)
.
( Chernoff and C arlson 1997, 1999)
, F ig 7
. R EE zon ing profiles o f g arnet fo r sa ple 714 3 fro
m m
, , V erpenesset ( a) and four d ifferen tR EE pa tterns co rrespond to
four stag es o f garnet grow th ( b ) ( mod ified afte r K onrad
, ( P Ca Schm olke et al , 2008a)
.
REE ) , ,
, LREE HREE ,
, ; M REE ! REE ( Zone
, ; HREE , 2), HREE M REE ,
( Y ang and R ivers 2002)
, HREE M REE ,
, , Ep
, ,
K onrad Schm o lke et al. ( 2008a) ( ) Amp+ Ep∃ G rt( 2) ( G rs ) + Cpx ( 1) + K y+ Q tz
, + H 2O REE M REE , HREE
, LREE ( Z one 3),
, , , ,
( 7) ( ) Amp + Cpx ( 1) ∃ G rt( 3) + Cpx ( 2 ) + Q tz+
REE ( Zone 1), HREE H 2O REE M REE , HREE
M REE , HREE , MR EE ( Zone 4),
, , , Ky, Cpx( 2) +
Chl+ Ep+ Q tz∃ ( A l ) G rt( 1) + (
m ) K y∃ G rt( 4) + Cpx ( 3) + Q tz
Amp+ H 2 O, HREE ( SI S)
M

9. 夏琼霞等: 高压 超高压变质岩石中石榴石的环带和成因 441
( LA ICP M S) , ,
( ), M REE HREE TTG
( B ea
et al , 1996; G r iffin et al. , 1996, 1999; Egg in, 2003; Rusk et
. ( Z hang et al , 2009, 2010)
.
al , 2004; Luguet et al. , 2005 R ighter et al. , 2005;
. ;
, 2005 2006)
,
Sass i et al. ( 2000) SI S
M 4 石榴石的氧同位素环带
, HREE , 20 90
Jahn et al. ( 2003 2005)
, ( Chamber la in and Conrad 1991, 1993; Y oung and
,
LA I M S
CP , R um ble 1993; Ja tve it and H erv ig 1994),
, m , K ohn et al.
, ( 1993)
X iao et T ie rra de l F uego
al ( 2001 2002)
. , , 18
O 5∋ ,
LA ICPM S , 75
( 2004) ( K ohn et al. , 1993)
LA I M S
CP , ,
Ce ,
( 2006) ( CCSD ) ( Chamber la in and Conrad, 1991, 1993; Y oung and Rum ble,
, M REE 1993; Ja tve it and H erv ig 1994; K ohn and V a lley 1994; V an
m , ,
M REE HREE H aren et al. , 1996 Crowe et al. , 2001; Ske lton et al. , 2002;
;
, Sm Lu ( H aur i et al ,
. M a rtin et al , 2006)
. K ohn et al. ( 1997)
1994), , ,
, HREE MR EE , ,
( H ickm ott et al. , 1987
; H ickm o tt and Sh i izu,
m 1990; X iao et al. ( 2002)
Schwandt et al. , 1996) CCSD /
M REE , ( 2006) , 5 8 ( 5 2mm 18
O
HREE ( 8 9∋ ~ 9 3∋ ), ( )
18
, HREE ( K le in et al , 2000),
. O ( 6 8∋ ~ 7 4∋ ) ,
( K osler 2001 ),
, ,
18
HREE O
, , ,
18
HREE , / , O
18
, , O,
18
HREE , O , X iao et al. ( 2002 )
18
!: ( 1) O
M REE HREE ,
( Rubatto 2002; W h itehouse and P latt 2003); ( 2)
, , Lu H f
176
L u /177 H f 176
H f/
177
Hf ( Zheng et al. , 2005 W u et al. , 2006)
;
5 石榴石中的矿物包裹体研究
,
( X ia et al , 2009, 2010; Zheng 2009a Chen et al ,
. , ; . (
2010), ( ) ,
) (
) , ( , 2004)
HREE , 900 ,
DZr/ Grt % 1, 850 DZ r/G rt # 5( R ubatto and
H er ann, 2007)
m & 850 , /

10. 442 A cta P etro log ica Sinica 岩石学报 2011, 27( 2)
, ( Na K A l S i ),
( X iao et al. , 2000, , ,
2001, 2002 Franz et al , 2001;
; . Scambe llur i and Philippo t
, ( Scambellur i and Philippo t 2001;
, , 2009)
2001; T ouret 2001; Fu et al , 2001, 2002 2003a b; Fan et
, . , ,
al ,
. 2002, 2003, 2005; Shen et al. , 2003
; T ou ret and ,
Co pagnon,i 2003;
m , 2005 2006;
, , 2005
;
, 2005, 2006; Zhang et al. , 2005b, 2006 2007, 2008)
, ( Parkinson, 2000; K a abata and T akafuj,i 2005 Cutts et
w ;
( Zheng, al , 2010)
. K awabata and T akafuji ( 2005)
2008; Zheng et al. , 2009a ), Setouch i ,
( Zheng, ,
2009a b; Zheng et a l , 2009b, 2011)
, . ;
, , P ark inson
( O kay et al. , 1989; W ang et al , 1989 1992 )
. , ( 2000) K okche tav ,
( Xu et al. , 1992) ,
( > 100km ), , , (
8): ( T ype 1 );
, ( + + ) , ,
( Okay et al. , 1989) , ,
, ( T ype 2) ; +
, , ( Type 3);
, W ang and , , ( T ype
L iou ( 1991) 4);
, T ype 1 ,
(T = 380~ 580 , P < 1 0G Pa); 3
( Ferrando et al , 2005; M a lasp ina et al ,
. . ,
2006; , 2009) Ferrando et al. ( 2005) ( P ~ 2 6G Pa T ~ 600
, ) , K okche tav
W ang
, + + ∀ et al ( 1992)
.
∀ Zn ∀ ∀ ∀ ∀ ∀ , ,
∀ M a laspina et al. ( 2006)
,
( ), ,
10% ~ 20% 80% ~ 90% 400 1 2~ 1 5GP a
( + ∀ ∀ ∀ ) , ,
, , 600 ,
/ 2 0~ 2 2GP a
Saxon ian E rzg eb irge ,
(Hw ang et al , 2001 Stockhert et al. , 2001)
. ; Cutts et al. ( 2010) M oine Superg roup
K okchetav , LA I
CP
(Hw ang et al. , 2003) MS U Pb ,
, U Pb 825 ~ 780M a,
/ ( Ph ilippot ; U Pb 724
and Se lverstone, 1991; Ph ilippot
, 1993; Ph ilippot et al ,
. ∀ 6M a, SI S
M U Pb 725 ∀ 4M a ,
1995; Zhang et al. , 2008 M posko s et al. , 2009 ),
; ;
(H ura i et al. , 2010) U Pb 464 ∀ 3 a
M , 462 ∀
, 2M a SI S
M 463 ∀ 4M a
, , , ,

11. 夏琼霞等: 高压 超高压变质岩石中石榴石的环带和成因 443
8 K ulet ,
( Park inson, 2000 )
F ig 8
. Sketch of garnet po rphyrob last in K ulet wh itesch ist ( N 307 ), show ing co rre lation betw een inc lusion asse lages and
mb
prograde co pos itiona l zona tion
m
N ote rad ial fractu ring around sil ica inclusions in them an tle reg ion U pp er right in set show s com pos itional l ine p rofile of th eG rt and low er right in set
, ,
system atic d istribu tion of s ilica inclus ion types Q tz and / or C oe in the G rt ( after Park inson, 2000 )
U Pb ,
, , 6 结语
: ( 1) ,
( K awabata and T akafuj,i 2005); ( 2)
, , ,
,
( O kay et al. , 1989 W ang et al. , 1989,
;
1992; Parkinson, 2000); ( 3) ,
, + ,
( van R oer und and D rury 1998 Y e et al. , 2000;
m , ;
, 2002; Song et a l , 2004) ,
.
,
, , ,
, ,
,