11.3 Dynamic Denudation Accumulation Systems
0.1
0.2
0.5
1
2
5
10
20
50 100
1~--~~-4~----r-~--LI~'~, ~'----+I--~I~----~'--~I
Ad/Ab~
?~
2
5
a
2
5
- ca
~
-
10-k---E
Q)
-,
b
Ad/Ab
2
co
E
E 5
E
0:
U) 10
C
co
~ 20
:ro,
11
1I
Ii n
~
(In
E 20
a:
Cf)
Global av.©
~ o.~Ulf of
-~ 1'&1')
California
50
\\
D 11
ii~ J" 11
:! c 11
c
ca
CI)
50
~
i S' ' ' o
' ,,~
. I ~~/ >0~
100
"
V
.,
Locall'y
~
/ ____ ~:_ Xi9~~ ~ ::-~: 7 0 _200
100-k--- S
T-i,
I
--1_ _
::- ~ ....
engal fan
Rhone ~ "'<. Slack Sea
200
500
1000
5000", r fan I:',-~: I
Lake-D
"
~" ---,
Chad
"
........-"
-"
-'.....
C
7.
--- __ 70
Q
---- iS'~ V
I Miss. fan
" .
;Qo 6 -- -
Nile fan
Y e l l o w '
-------Sea ~V,~casp;an, Se,
7 Q
V o
= Perialpine =.
lake.
_~
10000J ___ - L __ ~~ ____ l _ _ _ _L~~_L _ _ ~~ _ _ ~-L~L---~
511
Fig. 11.20. Interrelationship between the ratio of
drainage and basin area, Ai Ab' and the mean mechanical sedimentation, SKme' of various basins
(summary). a Trends in the development of
extensional and closing basins (arrows) as weH as
results from some young basins and deep-sea fans.
(Ihe Xigaze forearc basin is Cretaceous; cf. Sect.
12.5.3, Fig. 12.27; b Trend of SR..,e in foreland basin
affected by two phases (1 and II) of overthrusting.
Stage A Overthrust beit still submerged. B Rising
mountain belt. C Increasing drainage area; D:
The average sedimentation rate for dry solid post-rift
deposition was found to be 25 mlMa for the young
gulf and 50 mlMa for its eastem shelf, where the
young sediments lie on protogulf deposits. When the
areal extents of both depositional areas are taken into
account, the average sedimentation rate becomes 36
mlMa (Fig. 11.l9t). Because 11 of the 36 mlMa are
Stillstand, lowering relief
made up of biogenic silica, carbonate, and organic
matter, only 25 mlMa originate from the influx of
terrigenous material (Fig. 11.19b). Ihis average
value for the post-rift gulf does not take into account
that the areal extent of the basin increased during the
last 4 Ma. At present the basin is about three times
larger than 4 Ma ago when it mainly comprised the
0.1
0.2
0.5
1
2
5
10
20
50 100
1~--~~-4~----r-~--LI~'~, ~'----+I--~I~----~'--~I
Ad/Ab~
?~
2
5
a
2
5
- ca
~
-
10-k---E
Q)
-,
b
Ad/Ab
2
co
E
E 5
E
0:
U) 10
C
co
~ 20
:ro,
11
1I
Ii n
~
(In
E 20
a:
Cf)
Global av.©
~ o.~Ulf of
-~ 1'&1')
California
50
\\
D 11
ii~ J" 11
:! c 11
c
ca
CI)
50
~
i S' ' ' o
' ,,~
. I ~~/ >0~
100
"
V
.,
Locall'y
~
/ ____ ~:_ Xi9~~ ~ ::-~: 7 0 _200
100-k--- S
T-i,
I
--1_ _
::- ~ ....
engal fan
Rhone ~ "'<. Slack Sea
200
500
1000
5000", r fan I:',-~: I
Lake-D
"
~" ---,
Chad
"
........-"
-"
-'.....
C
7.
--- __ 70
Q
---- iS'~ V
I Miss. fan
" .
;Qo 6 -- -
Nile fan
Y e l l o w '
-------Sea ~V,~casp;an, Se,
7 Q
V o
= Perialpine =.
lake.
_~
10000J ___ - L __ ~~ ____ l _ _ _ _L~~_L _ _ ~~ _ _ ~-L~L---~
511
Fig. 11.20. Interrelationship between the ratio of
drainage and basin area, Ai Ab' and the mean mechanical sedimentation, SKme' of various basins
(summary). a Trends in the development of
extensional and closing basins (arrows) as weH as
results from some young basins and deep-sea fans.
(Ihe Xigaze forearc basin is Cretaceous; cf. Sect.
12.5.3, Fig. 12.27; b Trend of SR..,e in foreland basin
affected by two phases (1 and II) of overthrusting.
Stage A Overthrust beit still submerged. B Rising
mountain belt. C Increasing drainage area; D:
The average sedimentation rate for dry solid post-rift
deposition was found to be 25 mlMa for the young
gulf and 50 mlMa for its eastem shelf, where the
young sediments lie on protogulf deposits. When the
areal extents of both depositional areas are taken into
account, the average sedimentation rate becomes 36
mlMa (Fig. 11.l9t). Because 11 of the 36 mlMa are
Stillstand, lowering relief
made up of biogenic silica, carbonate, and organic
matter, only 25 mlMa originate from the influx of
terrigenous material (Fig. 11.19b). Ihis average
value for the post-rift gulf does not take into account
that the areal extent of the basin increased during the
last 4 Ma. At present the basin is about three times
larger than 4 Ma ago when it mainly comprised the