Mineralogy and chemical

compositions of chondrule

rims in the CM carbonaceous

chondrites

CM

CM

ol

:

( )

( )

0.3mm100μm

( )

(Mg, Fe)2Si2O6 , Mg2Si2O6 (Mg,Fe)3Si2O5(OH)4

( )

FeS (Fe, Ni)9S8 6(Fe0.9S) (Mg,Fe2+)(OH)2

10μm50μm

Nogoya

PCP

• :Metzler et al. (1992)

( )

( )

: SEM-EDS

: Y791198 ( ), Cold Bokkeveld ( ), Nogoya ( )

:

: 5μm-150μm,

Y791198 ( ) Nogoya ( )

50μm 0.1mm

mode ( + )

vol%

40 1727

25μm

major minerals:

( ), ( ),

minor minerals:

, ( ),

Y791198 ( )

( )

0.1mm

PCP

major minerals:

( )

minor minerals:

( ),

Nogoya ( )

( )

20μm0.1mm

( )Cold Bokkeveld ( )

(Enstatite)

( PCP)

Nogoya( )

serp

entin

e

Fe

MgSi+Al

serp

entin

e

Y791198( )

serp

entin

e

Si+Al

Fe

Mg Cold Bokkeveld( )

serp

entin

e

Mg

Fe

Si+Al

PCP

serpentine PCP (Mg-rich) (Mg )

( )

Mg ( )

1. :

2. :

3. : Fe-rich Mg-rich

( Mg )

( )