Page 54 - Carbonate Facies in Geologic History

Trends of Carbonate Buildups May Be Controlled by Tectonic Movements 41

001.0
~ '(;'
""
l Im" 0" r •• ' me",.s . __ _ ..
L",u r of pia. 'on" corbona'"
BEAVERHILL LAI(E •••.•••• '
LEOUC • • .. •. • __
ThruI' foul' . ~
AflO, Moun/jor. 196B

Fig. II-19. Linear trends of Late Devonian platforms across Alberta basin from Toomey et al.
(1970, Fig. i)

ate buildups. Movements both preceding and during carbonate deposition are
known to be important. A good illustration of this in the Holocene and late
Tertiary is seen in the British Honduras-Yucatan barrier reef around the Carib-
bean and the several large atolls or banks off shore from it. Often such faults cause
multiple lineaments of carbonate bodies which are recognizable in the geologic
record. Many of these have underlying positive gravity anomalies (Ball, 1967 a)
with intervening basins represented by negative anomalies. Examples are: the
Bahama Islands which are formed on a north-west trending pre-Cretaceous posi-