ICONS atlas: AFR - Chad Basin

Regional basin list

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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.

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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