ICONS atlas: AFR - Chad Basin

Regional basin list

To view the data for individual basins, select a basin from the dropdown menu below or click the basin name in the overview table. This will open a separate page with detailed maps.

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Overview

This page bundles the available data for the Chad 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.

Select data to display:

Chad Basin location map
Basin name Chad Basin
Region code AFR
Basin ID 7320
Plate location/code intra-cratonic/INC
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.

Chad Basin cross section
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Dynamic topography evolution for basin centroid
Chad 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
Chad Basin location map
Statistics - Mantle Lid thickness
Median 112.864
Mean 110.942
Scale 25.461
stdev 23.862
Z_min/Location 75.813/15.0°Lat 12.0°Lon
Z_max/Location 160.324/ 22.6667°Lat 9.3°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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Depth of 550 deg isotherm
Chad Basin location map
Statistics - Depth of 550 deg isotherm
Median -42.838
Mean -42.887
Scale 4.670
stdev 4.334
Z_min/Location -53.001/22.5°Lat 8.8°Lon
Z_max/Location -36.729/ 10.9333°Lat 12.4333°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
Chad Basin location map
Statistics - Mobil isopachs
Median 1.560
Mean 1.697
Scale 1.126
stdev 1.113
Z_min/Location -0.445/12.2333°Lat 18.7°Lon
Z_max/Location 4.291/ 14.5°Lat 13.4333°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
Chad Basin location map
Statistics - Plain crustal thickness
Median 38.993
Mean 39.296
Scale 1.842
stdev 1.766
Z_min/Location 36.146/19.2333°Lat 12.7667°Lon
Z_max/Location 43.602/ 12.6°Lat 9.53333°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
Chad Basin location map
Statistics - Base middle crust
Median -27.160
Mean -27.087
Scale 0.979
stdev 1.043
Z_min/Location -29.826/12.7667°Lat 9.6°Lon
Z_max/Location -25.186/ 12.7333°Lat 16.4333°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
Chad Basin location map
Statistics - Base lower crust
Median -40.194
Mean -40.157
Scale 1.813
stdev 1.359
Z_min/Location -42.827/12.7667°Lat 9.6°Lon
Z_max/Location -37.383/ 19.9°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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Total crustal thickness
Chad Basin location map
Statistics - Total crustal thickness
Median 40.665
Mean 40.585
Scale 1.802
stdev 1.387
Z_min/Location 37.831/19.9°Lat 13.5333°Lon
Z_max/Location 43.450/ 12.6667°Lat 9.56667°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
Chad Basin location map
Statistics - Base upper crust
Median -13.809
Mean -14.063
Scale 0.429
stdev 0.711
Z_min/Location -16.393/16.9667°Lat 14.0333°Lon
Z_max/Location -12.918/ 15.0333°Lat 21.0667°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
Chad Basin location map
Statistics - Thermal lithospheric thickness
Median 152.751
Mean 151.527
Scale 25.488
stdev 23.540
Z_min/Location 117.892/10.9333°Lat 12.8667°Lon
Z_max/Location 200.003/ 22.5°Lat 8.8°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
Chad Basin location map
Statistics - Heatflow
Median 77.475
Mean 78.038
Scale 3.489
stdev 4.099
Z_min/Location 70.693/22.6667°Lat 8.7°Lon
Z_max/Location 97.070/ 12.0°Lat 9.96667°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)
Chad Basin location map
Statistics - Topography (ETOPO2)
Median 355.000
Mean 398.379
Scale 99.334
stdev 126.949
Z_min/Location 212.000/17.7333°Lat 18.7°Lon
Z_max/Location 1244.000/ 18.4333°Lat 9.23333°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
Chad Basin location map
Statistics - Base hard sediments
Median -0.701
Mean -0.861
Scale 0.588
stdev 0.883
Z_min/Location -3.393/16.9667°Lat 14.0333°Lon
Z_max/Location 1.114/ 24.1667°Lat 9.23333°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
Chad Basin location map
Statistics - Temperature at 50km depth
Median 649.519
Mean 655.869
Scale 74.093
stdev 63.545
Z_min/Location 538.993/22.5°Lat 8.8°Lon
Z_max/Location 759.747/ 10.9333°Lat 12.4333°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
Chad Basin location map
Statistics - Laske sediment thickness
Median 0.811
Mean 1.251
Scale 0.502
stdev 1.112
Z_min/Location -0.145/11.1333°Lat 13.3333°Lon
Z_max/Location 6.510/ 15.9667°Lat 14.0°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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Lithospheric temperature gradient
Chad Basin location map
Statistics - Lithospheric temperature gradient
Median 6.435
Mean 6.568
Scale 0.872
stdev 0.847
Z_min/Location 5.071/22.5333°Lat 8.76667°Lon
Z_max/Location 8.090/ 11.2°Lat 12.0667°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
Chad Basin location map
Statistics - Isostatic correction
Median 0.345
Mean 0.514
Scale 0.210
stdev 0.427
Z_min/Location 0.000/23.6°Lat 8.93333°Lon
Z_max/Location 2.386/15.9667°Lat 14.0°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)
Chad Basin location map
Statistics - TTS (sediment)
Median 0.359
Mean 0.347
Scale 0.450
stdev 0.647
Z_min/Location -1.137/24.1667°Lat 9.23333°Lon
Z_max/Location 2.728/17.8333°Lat 14.1°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)
Chad Basin location map
Statistics - Beta (Sediment)
Median 1.048
Mean 1.055
Scale 0.062
stdev 0.101
Z_min/Location 0.873/24.1667°Lat 9.23333°Lon
Z_max/Location 1.536/17.8333°Lat 14.1°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.
Chad Basin location map
Statistics - Crustal vs lithosph. extn.
Median -0.089
Mean -0.150
Scale 0.197
stdev 0.194
Z_min/Location -0.497/15.0°Lat 12.0°Lon
Z_max/Location 0.140/22.6667°Lat 9.33333°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
Chad Basin location map
Statistics - Anomalous TTS
Median 0.117
Mean 0.195
Scale 0.316
stdev 0.502
Z_min/Location -1.165/24.1667°Lat 9.23333°Lon
Z_max/Location 2.262/17.7667°Lat 14.2°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
Chad Basin location map
Statistics - Predicted elevation
Median 965.485
Mean 1008.430
Scale 480.459
stdev 427.454
Z_min/Location 88.816/22.6667°Lat 9.33333°Lon
Z_max/Location 1652.740/15.0°Lat 12.0°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)
Chad Basin location map
Statistics - Beta (Crust)
Median 1.028
Mean 1.022
Scale 0.049
stdev 0.045
Z_min/Location 0.919/12.6°Lat 9.53333°Lon
Z_max/Location 1.109/19.2333°Lat 12.7667°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)
Chad Basin location map
Statistics - TTS (crust)
Median 0.211
Mean 0.152
Scale 0.360
stdev 0.345
Z_min/Location -0.689/12.6°Lat 9.53333°Lon
Z_max/Location 0.766/19.2333°Lat 12.7667°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
Chad Basin location map
Statistics - Differential Beta
Median 0.015
Mean 0.033
Scale 0.043
stdev 0.083
Z_min/Location -0.130/24.1667°Lat 9.23333°Lon
Z_max/Location 0.471/17.8°Lat 14.1333°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