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Transcript
JA N M AY E N A N D P L AT E B O U N DA R I E S I N T H E N E AT L A N T I C
603
Table 1. Finite rotations of the northern Jan Mayen microcontinent
relative to a fixed Eurasia plate
Chron
Age
Latitude
Longitude
Angle
13y
18o
20o
21o
22o
23o
24o
25y (fit)
30.0
33.1
40.1
43.8
47.9
49.7
50.9
53.3
55.9
0.00
67.11
58.90
60.03
56.49
54.60
55.44
27.28
40.00
0.00
129.15
157.90
158.66
153.68
154.09
154.43
136.06
145.00
0.00
0.62
8.52
13.22
12.89
13.57
15.99
7.11
11.40
Table 2. Finite rotations of Greenland relative to a fixed Eurasia plate
Chron
Age
Latitude
Longitude
Based on Gaina et al. (2002) dataset
5o
10.9
66.40
133.00
6o
20.1
68.90
132.60
13y
33.1
68.32
132.60
18o
40.1
61.38
137.81
20o
43.8
57.80
135.00
21o
47.9
53.54
128.40
22o
49.7
50.66
127.80
24o
53.3
51.50
122.20
25y (fit)
55.9
52.00
122.80
Subset of magnetic data from Greenland and Lofoten basins
5o
10.9
66.40
133.00
6o
20.1
68.90
132.60
13y
33.1
68.32
132.60
18o
40.1
58.87
133.47
20o
43.8
56.25
130.96
21o
47.9
53.56
127.71
22o
49.7
48.49
128.53
24o
53.3
51.50
122.10
Subset of magnetic data from Irminger and Iceland basins
5o
10.9
66.40
133.00
6o
20.1
68.90
132.60
13y
33.1
68.32
132.60
18o
40.1
55.88
136.05
20o
43.8
57.80
135.35
21o
47.9
37.02
136.20
22o
49.7
42.32
136.07
24o
53.3
51.50
122.20
Angle
2.56
5.08
7.68
8.61
8.89
9.29
9.56
11.37
12.40
2.56
5.08
7.68
7.97
8.45
9.24
9.27
11.35
2.56
5.08
7.68
8.00
8.15
8.64
9.47
11.37
reflection lines from the Jan Mayen microcontinent (Fig. 5), and
published interpretations of seismic profiles (Richardson et al.
1998; Korenaga et al. 2000; Nielsen et al. 2002; Hopper et al.
2003; Spitzer et al. 2005).
Fig. 2. (a) Overview of magnetic data interpretations in the NE Atlantic
(+; from Gaina et al. 2002). The rectangle shows the location of the
magnetic anomaly interpretation in the Norway Basin: d, based on
Verhoef et al. (1996) magnetic data compilation; ., based on a recent
magnetic survey in the northernmost part (Olesen et al. 2007; Gernigon
et al. 2009). Background image is the free air gravity anomaly (Sandwell
& Smith 1997; Forsberg & Kenyon 2004) highlighted by the directional
derivative (1208) of the free air gravity. Seaward-dipping reflectors
(SDRS) are shaded transparent light grey; black line indicates continent–
ocean boundary (COB). JMMC, Jan Mayen microcontinent; EJMFZ and
WJMFZ, east and west Jan Mayen Fracture Zone, respectively.
(b) Schematic crustal transect A–B and magnetic profile across the
Norwegian–Greenland Sea. The profile shows the magnetic anomalies
from C24 (and possibly C25) to the extinct Aegir Ridge in the Norway
Basin, east of the Jan Mayen microcontinent, and from C6–7 to the
present Kolbeinsey Ridge, west of the Jan Mayen microcontinent.
Seismic data
In this study we have used selected seismic lines from both the
IS-JMR-01 and NPD-JM-85 seismic surveys. The IS-JMR-01
survey was collected by Wavefield Inseis ASA between 20 July
and 12 August 2001, using the vessel M.V. Polar Princess. The
survey consists of 2765 km of new filtered migrated reflection
seismic recorded to a depth of 10 s and extends the earlier
seismic reflection survey (NPD-JM-85) that was jointly collected by the Norwegian Petroleum Directorate (NPD) and the
National Energy Authority of Iceland in 1985. This earlier
survey has been described and interpreted by Skogseid &
Eldholm (1987) and Gudlaugsson et al. (1988). The new dataset
provides a better picture of the Jan Mayen structures and a
better resolution of the seismic facies, which will be described
in detail in a future contribution. The interpretation of the ISJMR-01 and NPD-JM-85 seismic reflection data combined with
gravity and magnetic data (Fig. 5) was integrated into our platetectonic context, to decipher the tectonic evolution of the Jan
Mayen microcontinent and surrounding areas at a regional
scale.