ICONS atlas: AFR - Djefara Basin

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Overview

This page bundles the available data for the Djefara Basin in the Africa. The images are hyperlinks and will open up a separate window with a high resolution PDF image of the map.
The basin data is derived from a lower resolution grid which has been upsampled using GMT. This could have introduced an accuracy which is beyond the original data resolution.

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Djefara Basin location map
Basin name Djefara Basin
Region code AFR
Basin ID 7220
Plate location/code pasv divrg cont marg/PDC
Basin cross section

The basin cross section is automatically generated using the available crustal structure data sets. Sometimes the data labels are not plotted correctly, depending on the length of the section.

The location of the profile is indicated in all maps as dashed-dotted thin black line. For the endpoints of the profile, the two points of a given polygon located farthest away from each other were computed.

Djefara Basin cross section
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Dynamic topography evolution for basin centroid
Djefara Basin dynamic topography through time

The dynamic topography history for the basin is derived by tracking the basin centroid. The paleo-location for this point is computed using the EarthByte plate kinematic framework rotating the position back in time.

The dynamic topography model is derived from the S20RTS seismic tomography model (Ritsema et al., 99) by converting seismic velocites to density anomalies using an empirical scaling factor of 0.25. The density anomalies are then advected back in time to compute mantle flow with plate motions superimposed (using the EarthByte plate rotation framework) as surface boundary conditions. The dynamic topography is then derived from the computed density distribution using a free upper boundary. For details regarding the methodology see the following papers:

  • B. Steinberger, H. Schmeling, and G. Marquart. Large-scale lithospheric stress field and topography induced by global mantle circulation. Earth Planet. Sci. Lett., 186:75-91, 2001.
    doi: 10.1016/S0012-821X(01)00229-1.
  • B. Steinberger. Effects of latent heat release at phase boundaries on flow in the Earth's mantle, phase boundary topography and dynamic topography at the Earth's surface. Phys. Earth Planet. Int., 164:2-20, 2007.
    doi: 10.1016/j.pepi.2007.04.021.

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Observations

Mantle Lid thickness
Djefara Basin location map
Statistics - Mantle Lid thickness
Median 83.125
Mean 82.851
Scale 1.562
stdev 1.613
Z_min/Location 78.686/32.7°Lat 15.1°Lon
Z_max/Location 86.188/ 33.0°Lat 11.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Depth of 550 deg isotherm
Djefara Basin location map
Statistics - Depth of 550 deg isotherm
Median -37.203
Mean -37.259
Scale 0.413
stdev 0.371
Z_min/Location -38.000/33.0°Lat 11.0°Lon
Z_max/Location -36.540/ 33.1667°Lat 13.5667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Mobil isopachs
Djefara Basin location map
Statistics - Mobil isopachs
Median 2.904
Mean 2.984
Scale 1.265
stdev 0.952
Z_min/Location 1.206/33.0°Lat 14.4°Lon
Z_max/Location 4.484/ 33.3333°Lat 11.6333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Plain crustal thickness
Djefara Basin location map
Statistics - Plain crustal thickness
Median 33.323
Mean 33.460
Scale 1.760
stdev 1.467
Z_min/Location 30.572/33.8°Lat 11.2667°Lon
Z_max/Location 36.622/ 32.4°Lat 15.3°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base middle crust
Djefara Basin location map
Statistics - Base middle crust
Median -25.693
Mean -25.630
Scale 1.216
stdev 1.110
Z_min/Location -28.255/32.4°Lat 15.5°Lon
Z_max/Location -23.153/ 33.7°Lat 11.4667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base lower crust
Djefara Basin location map
Statistics - Base lower crust
Median -36.649
Mean -36.790
Scale 1.792
stdev 1.552
Z_min/Location -40.474/32.4°Lat 15.4°Lon
Z_max/Location -33.663/ 33.7667°Lat 11.3333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Total crustal thickness
Djefara Basin location map
Statistics - Total crustal thickness
Median 36.956
Mean 37.074
Scale 1.916
stdev 1.613
Z_min/Location 33.826/33.7667°Lat 11.3333°Lon
Z_max/Location 40.653/ 32.4°Lat 15.3°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base upper crust
Djefara Basin location map
Statistics - Base upper crust
Median -14.609
Mean -14.621
Scale 0.852
stdev 0.807
Z_min/Location -16.533/32.4°Lat 15.5333°Lon
Z_max/Location -12.957/ 33.6667°Lat 11.5333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Thermal lithospheric thickness
Djefara Basin location map
Statistics - Thermal lithospheric thickness
Median 119.826
Mean 119.925
Scale 1.963
stdev 1.632
Z_min/Location 116.330/33.9667°Lat 10.8667°Lon
Z_max/Location 123.000/ 33.0°Lat 11.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Heatflow
Djefara Basin location map
Statistics - Heatflow
Median 72.142
Mean 72.016
Scale 4.716
stdev 4.451
Z_min/Location 60.321/33.5333°Lat 11.8°Lon
Z_max/Location 82.058/ 34.0°Lat 9.76667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Topography (ETOPO2)
Djefara Basin location map
Statistics - Topography (ETOPO2)
Median -1.000
Mean -11.335
Scale 63.752
stdev 102.726
Z_min/Location -457.000/32.7°Lat 15.1°Lon
Z_max/Location 384.000/ 32.6°Lat 13.8667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base hard sediments
Djefara Basin location map
Statistics - Base hard sediments
Median -3.247
Mean -3.330
Scale 0.369
stdev 0.346
Z_min/Location -4.349/32.8333°Lat 14.8333°Lon
Z_max/Location -2.899/ 33.2°Lat 12.0333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Temperature at 50km depth
Djefara Basin location map
Statistics - Temperature at 50km depth
Median 751.781
Mean 751.616
Scale 11.007
stdev 9.034
Z_min/Location 734.981/32.9667°Lat 11.0°Lon
Z_max/Location 774.159/ 32.9667°Lat 14.5333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Laske sediment thickness
Djefara Basin location map
Statistics - Laske sediment thickness
Median 2.209
Mean 2.349
Scale 1.257
stdev 1.069
Z_min/Location 0.797/32.8333°Lat 13.4667°Lon
Z_max/Location 4.829/ 33.6°Lat 11.6667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Lithospheric temperature gradient
Djefara Basin location map
Statistics - Lithospheric temperature gradient
Median 8.064
Mean 8.056
Scale 0.148
stdev 0.127
Z_min/Location 7.804/33.0°Lat 11.0°Lon
Z_max/Location 8.339/ 34.0°Lat 10.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Computations

Isostatic correction
Djefara Basin location map
Statistics - Isostatic correction
Median 0.908
Mean 0.951
Scale 0.486
stdev 0.407
Z_min/Location 0.339/32.8333°Lat 13.4667°Lon
Z_max/Location 1.854/33.6°Lat 11.6667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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TTS (sediment)
Djefara Basin location map
Statistics - TTS (sediment)
Median 2.292
Mean 2.379
Scale 0.631
stdev 0.598
Z_min/Location 1.112/33.5333°Lat 11.8°Lon
Z_max/Location 3.822/32.9°Lat 14.6667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Beta (Sediment)
Djefara Basin location map
Statistics - Beta (Sediment)
Median 1.415
Mean 1.456
Scale 0.161
stdev 0.170
Z_min/Location 1.166/33.5333°Lat 11.8°Lon
Z_max/Location 1.956/32.9°Lat 14.6667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Crustal vs lithosph. extn.
Djefara Basin location map
Statistics - Crustal vs lithosph. extn.
Median -0.014
Mean -0.018
Scale 0.047
stdev 0.036
Z_min/Location -0.106/32.4°Lat 15.4°Lon
Z_max/Location 0.045/33.7333°Lat 11.4°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Anomalous TTS
Djefara Basin location map
Statistics - Anomalous TTS
Median 2.612
Mean 2.560
Scale 1.030
stdev 0.848
Z_min/Location 0.692/33.6°Lat 11.6667°Lon
Z_max/Location 4.121/32.8333°Lat 14.8333°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Predicted elevation
Djefara Basin location map
Statistics - Predicted elevation
Median 1278.100
Mean 1294.670
Scale 130.339
stdev 113.084
Z_min/Location 1083.540/33.7333°Lat 11.4°Lon
Z_max/Location 1559.570/32.4°Lat 15.5°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Beta (Crust)
Djefara Basin location map
Statistics - Beta (Crust)
Median 0.981
Mean 0.979
Scale 0.053
stdev 0.043
Z_min/Location 0.893/32.4°Lat 15.3°Lon
Z_max/Location 1.070/33.8°Lat 11.2667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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TTS (crust)
Djefara Basin location map
Statistics - TTS (crust)
Median -0.148
Mean -0.181
Scale 0.421
stdev 0.351
Z_min/Location -0.937/32.4°Lat 15.3°Lon
Z_max/Location 0.510/33.8°Lat 11.2667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Differential Beta
Djefara Basin location map
Statistics - Differential Beta
Median 0.461
Mean 0.477
Scale 0.210
stdev 0.196
Z_min/Location 0.110/33.6°Lat 11.6667°Lon
Z_max/Location 0.986/32.8667°Lat 14.7333°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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This basin data is based on interpolated global grids and might contain gridding errors or wrongly interpolated data values.

Page generated 2008-08-03 02:36:30 CEST | © Christian Heine, School of Geosciences, Sydney University, Australia