510
SPREADING
CENTER
Chapter 11 Sediment Supply, Subsidence, and Basin Fill
\ \
POROSITY (%1
80
40
200 \
c
400
800
\ \ \ \ \ \ \
TRANSFORM.
OF WET SED.
THICKNESS
\ INTO DRY
800 1---1f---'_'-\SOLID SED.
l
THICKN . \
OF WET
\
SED.
\
m ~~~~~~--r+
1000
o 100 2"00 300 400 500 600 m
THICKNESS OF SOLID MATTEIl
e
SLABli OF EQUAL
'THICKNESS
o 10 20 km
SW
IV
: 1 :\-_~
~WETSED=
4 0 10 20 km
f
DENUDATION =========2)
RATE IN
-
810GENie
MOUNTAINS
750 ml Ma
TERRIGENOUS
(rn/Mal
Fig. 11.19. Sediment budget ofthe central and southem Gulf of Califomia. a Evolution of the gulf from a
shallow-marine protogulf stage on continental crnst
to a transtensional narrow gulf with deep oceanic
spreading centers. b Drainage area, limits of the studied depositional area, and special sections (1- V)
across the gulf. c Porosity/depth relationship representative of major parts of the gulf and conversion
from wet to solid sediment thickness as shown in (e).
ON
. COAST AL PLAIN
~!~~~~~~~,i
d,e Sections 11 and IV of b with thicknesses of wet
(uncompacted, porous) sediment (vertical exaggeration x5), converted in e to dry (compacted, solid)
sediment (shown only for part of the section, vertical
exaggeration x50). f Average sedimentation rates in
the studied gulf area and derived mean denudation
rate in the corresponding drainage area. (After
Einseie and Niemitz 1982)