7.7 Continental Sequence Stratigraphy
a MAIN FACTORS CONTROLLING
FLUVIAL SYSTEMS
ALLUVIAL 0:
HIGH.GRADIENT
FAN
ovo"
LOW-SINUOSITY RIVER
.., ... .,.00"·
i
JE:- _ -- -:;.-:::: .... :....
UPL· ER
~ ........ ~.b .. ·.'.·,..···· .. :·· .. :I. .
UPLIFT
MOST I
- BEo'~LOAD CHANNELS - ± CLIMA TE
OF
~
CHANGE
FINES
SUB-SED
MEDIUM TO LOW-GRADIENT
~
HIGH·SINUOSITY RIVERS
~ ... r.·":o
Jl:--- .. ,~:, .. , t
.... ... , ......... ·DECR. UPLIFT
PART
MEANDERING- - - --_. 80. LOWERING
OF
~ MIXED. LOAD CHANNELS RELIEF
FINES
VERY LOW-GRADIENT
ANASTOMOSING RIVERS
~
~ :-:: ....... , :: ..... '0'·'·,.+
~:~~E ~ MUD.DOMINATED
AND /OR DISTANT
CHANNELS
SOURCE AREA
PLA Y A , lAKE
TRANSPORT
"
RATE
--~-~~~-~~~==~-----~-~-~
t ... SUB-SED = + OR349
b
DOWNSTREAM BASE-LEVEL CONTROL
OF FLUVIAL SYSTEMS
_""'.'
----~ .. .. : ... .
FALL
AN OR PL
2 _ - - - - -
. :,-: :'
\ -~----... :.
t~ 1
SEOU: BOUNOARY
BASE --- MUD-DOMINATED, . - - - - - - - - - - -
LEVEL
± MEANDERING
RISE
..... -BRAID~D OR MEAND.,
_-:-:. ~-r:..::::.
HORIZ. STACKING
_---~ .... ~
~
2----~
*-::-:-::--,----- ... . . . . . . . . .
__ _ -\000 - ___ __ -- - - BRAIDED, - - - - - - -
AN OR PL
VERTICAL ST ACKING
INCISED VALLEYS
t
SOllS
MEANDERING
~ '
1 \
-'
\..
I ....,. -" •
...... _-" ...... ~~ROGR. BRAIDED SYSTE M
~ '2~
--- --- -- -~- ------------- - - - - -
C SOURCE AREA AND /OR DOWNSTREAM CONTROL
OF FLUVIAL BASE LEVEL (BLI
d TYPES OF FLUVIAL
BASE-LEVEL CHANGE
COARSE FACIES
,--- ----PROGRADING
BACKSTEPPING
I
STEADY-STATE
2
BL = CONST. Bl-RISE
... \. ·.:.:'Z--~11111111111:
-2------ ~11~@:
3
Bl· FAll
.--_ ....
I
I
,
2
I
I
I
I
1: SED=SUB
2: SED>SUB
OR DECR. SUB
3: INCR. UPLIFT
IN SOURCE
--..,
I
3
11
'~";". ' AF
".<>
!;.: :
. . .
.' •. BD
STEADYSTATE
./
/ /
_---2'-~
CU :;,::.----,
UPLIFT IN
r
SOURCE AREA
~ -
-__ - 2 ' - - 1
FU == ----~
~ DOWNSTREAM UPLIFT
OR DECREASING SUB
AN = ANASTOMOSING RIVER
AF = ALLUVIAL FAN
BD = BRAIDED RIVER
ME = MEANDERING R.
UPL = UPLIFT
CU = COARSENING UP
FU = FINING UP
PL = PLAYA, LAKE
ER = EROSION