12.1 Rift Basins
PROCESS
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POST·
RIFT
TH:RM.
SUB·
SID.
TRANS·
ITION
EX·
TENS.
THERM.
SUB·
SID.
RIFT
ING
c
50
150
BASIN EVOLUTION
FURTHER DEVELOPMENT OF SHELF SEDIMENTS
MAINLY AFFECTED BY:
VARIATIONS IN CLIMATE AND OCEANIC
CIRCULATlON, FAUNAL EVOLUTION
.CENOZOIC
MESOZOIC
UNCON·
SEA LEVEL
FORMITY
CHANGES
a
MAJOR EVENTS IN
MESOZOIC RIFT BASINS
OF NORTH ATLANTIC
(FROM Hlscon ET Al. 1990)
APT.
DEFORMATION
AN) MULTlPLE HlATUSES
I
I BARR. CONDENSED SECTIONS
I HAUT. FINING UPWARD··
TRANSGRESSION
I VAL.
BERA.
TITH
TRANSGRESSIONS
.
AN) REGRESSIONS
KIMM.
VALLEY CUTTING AND
~
t
REGRESSION
FILLING LOCAL,ABRUPT
\
OXF. : DEEPENING
200
Ma
LAKES. LAGOONS. SHALLOW-MARINE
\
: WIOESPREAD HIATUS
\ CALL- :
OV.
LIMEST.
DOLOMITE
( ABOATED RIFTl
-SEA LEVEL
EXTENSION
EVAPORITES
CONTINENTAL RED BEDS. FAN DELTA
UPPER CRET. BQNAVISTA
UMEST. AND
PLATFORM
MUDST.
TRIASSIC RED BEDS
b
JEAf'..NE 0 ' ARC
FLEMISH
GAUCIA
BASIN
CAP
SYNDEPOSITIONAL
UPUFT. REWORKING
SALT
BASEMENT
TRANSFORM FAULT
BANK I8ERIA
557
Fig. 12.8. a Principles of Mesozoic rift basin evolution in the North Atlantic. b Idealized cross-section
between N ewfoundland and Iberia showing boundary fault of aborted Triassie rift basin and CallovianAptian extension of continental crust along low-angle detachment. Size of listric faulted blocks and associated basins increases in direction of shear (distal).
c Structure and sedimentary fill of Jeanne d'Arc basin
based on seismic interpretation (cf. Fig. 12.3d,e).
(Based on Tankard and Welsink 1988; Hiscott et al.
1990).