Page 265 - Physical Principles of Sedimentary Basin Analysis

7.15 Subsidence of the Vøring margin, NE Atlantic 247

Nyk Utgard Nordland
Hel High Naagrind High Traena Ridge Helgeland
Graben Syncline basin Basin Pleistocene
0
Pliocene
Oligo+Mio
Eocene
10
Paleocene
depth [km] 20 LCB Crust Maastrichtian
Campanian1
Campanian2
Late−Cretaceous1
Late−Cretaceous2
30 Mid−Cretaceous
Lithospheric mantle Early−Cretaceous2
Jurassic
40 Triassic
0 100 200 300
Paleozoic
x−coordinate [km]
(a)
40
crust thickness [km] 30

20

10
initial crustal thickness
present day crustal thickness
0
0 100 200 300
x−coordinate [km]
(b)
2.5
rift phase 1: 400 Ma to 360 Ma
rift phase 2: 310 Ma to 260 Ma
rift phase 3: 160 Ma to 140 Ma
rift phase 4: 80 Ma to 56 Ma
beta−factor [−] 1.5 4
2.0

3

1
2
1.0
0 100 200 300
x−coordinate [km]
(c)
Figure 7.32. (a) The sedimentary basin and crust for a profile at the Vøring margin. LCB is a
lower crustal body. (b) The thickness of the present day crust and an estimate for the initial crustal
thickness. (c) The β-factors along the profile for each rift phase.