596
Chapter 12 Basin Evolution and Sediments
a GREAT VALLEY FOREARC BASIN, CALIFORNIA
TRANSFOAM FAULT
(SAN ANOAEAS F.)
b
NEOGENE
~~--~~QQQ2~~
FAANClSCAN
COMPI..EX
(MESOZOIC)
NEOGENE
MAlN mENDS IN SANDSTONE PETAOFAOes
,
,
~VOLCANICS
rZ7777Z7/Zd OUARTZ
!
~
j
CAUST
c
Fig. 12.26. The Cretaeeous-Tertiary Great Valley
foreare basin of California. a Simplified map of major geoteetonie units. b Evolution of eonvergent margin and foreare basin of eentral California in three
stages; note transition from terraeed, residual basin
on oeeanie ernst (Cretaeeous) to shelved eomposite
basin on both oeeanie ernst and subduetion eomplex
(Paleogene). The final stage is a relie foreare basin,
SUBOUCT'ON COMPI..EX
+ FIU.E) COMPOSITE
VOLCANIC APC \ 1/
- FOREAAC BASlN
PALAEOGENE
EARLYCRET.
APCMASSlF
(ACCAErED
JURASSIC ARe)
\1/
QCEANIC CRUST
SAN ~OREAS FAULT
COUJSION ZONe OF
EARUER (JUAASSIC)
OCEANICAPC
d
N
A
the western part of whieh was uplifted and partially
eroded. c Simplified eross-seetion of Great Valley
(loeation shown in a and b). d Map view of basin
evolution, showing widening of basin as well as migration of volcanie are with time. (After Diekinson
and Seely 1979; Ingersolll982; Moxon and Graham
1987)