Page 145 - Carbonate Sedimentology and Sequence Stratigraphy

136 WOLFGANG SCHLAGER

shelf-break
Site 1005
(351 mbsl, 1.5 km)
Holocene
0.01 My
Late
Pleistocene
Site 1003
(481 mbsl, 4 km) 0.26 My

Middle
Site 1006 Pleistocene
(658 mbsl, 30 km)
Site 1007
0.90 My
(647 mbsl, 10 km)
Holocene Early
Late Pleistocene
Pleistocene AB
A/B 1.60 My
Late
Middle
Pleistocene Pleistocene
C
Early
Pleistocene
C
50
Late
Pleistocene
20 km 10 km
0
mbsf
Fig. 7.37.— Erosional truncation of the Bahamian platform slope in the Florida Straits. Erosion is probably caused by steepening of
the slope as it grows higher (see Fig. 3.12) and by current scouring from the Gulf Stream). After Rendle and Reijmer (2002), modified.

high sedimentation rate
aragonite Fig. 7.38.— Model of creating later-
high Mg calcite ally continuous impedance contrast at
organic material the boundary of highstand and lowstand
deposits by selective marine cementa-
high sea level high diagenetic potential
tion. Cementation preferentially affects
highstand deposits because they are rich
low sea level low diagenetic potential Meteoric in metastable aragonite. After Eberli et
cementation
al. (2002), modified.
marine diagenesis:
low sedimentation rate cementation, dolomites
low Mg calcite dissolution, cementation
aragonite
clay

impedance seismic response
v1*ρ1
v1*ρ1<v2*ρ2
v2*ρ2