10.5 Organic Matter Preservation in Marine Sediments
a PRODUCTIVITY AND
VERTICAL Corg FLUX ( FeorARe >
:
~
a.
w
c
- /
I
I
I
I
,
I
I
I
I
I
I
I
I
.
I
J
~ ... '"
.. ..
" NEW·
PROD.
NO OXYGEN
MINIMUM
PRIMARY
PROD.
DEEP
BASINS
:
BENTHIC
L __ /- ~OUNDARY LA VER
:
SEDIMENT
BDL =~
AR bJ ····· A~ ..... ..
I -
"--::;' .:
I ::' :' .:::
AR
.. .. . :::' .:: ... . . :-:.::
e
ARe
--- -
C = ARe
eARl + AR e
C PRODUCTIVITY AND
VERTICAL Corg FLUX ( Fc or ARe>
,'"
BDL
ARe
Ce
I
.
!
"
-
.. ,
.........
SHALLOW
BASINS
very
high
I , ~-ob ~ ' 0· · ',' .' :,'
very
high
low
b PRODUCTIVITY AND
VERTICAL Corg FLUX
. ....
d PRODUCTIVITY AND
VERTICAL Corg FLUX
. '
BDL
ARe
d : · · : · · · · · ·
, 0,
• • ••
.:->: :,0:
-475
Fig. 10.9. Semiquantitative models
showing the deerease in organie
earbon flux Fe from
surfaee waters
through the deeper
water eolumn and
zone of benthie degradation loss BDL to
site of ultimate
burial in sediment
(aeeumulation rate
ARe). The models
display deep (a,b)
and shaHow basins
(c,d) as weH as oxie
(a,c) and anoxie
environments (b,d).
BDL and eoneentration of organie earbon Ce in the buried
sediment are mainly
eontroHed by the
inorganie aeeumulation rate AR! (cf.
Fig. lO.7b)