ICONS atlas: AFR - Illizi Basin

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Overview

This page bundles the available data for the Illizi 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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Illizi Basin location map

Basin name	Illizi Basin
Region code	AFR
Basin ID	7230
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.

Illizi Basin cross section

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Dynamic topography evolution for basin centroid

Illizi 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

Illizi Basin location map

Statistics - Mantle Lid thickness
Median	130.258
Mean	128.086
Scale	23.165
stdev	19.207
Z_min/Location	88.907/29.1333°Lat 6.6°Lon
Z_max/Location	160.074/ 25.0°Lat 9.0°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

Illizi Basin location map

Statistics - Depth of 550 deg isotherm
Median	-46.272
Mean	-45.960
Scale	4.278
stdev	3.580
Z_min/Location	-53.000/25.0°Lat 9.0°Lon
Z_max/Location	-39.207/ 29.1333°Lat 6.6°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

Illizi Basin location map

Statistics - Mobil isopachs
Median	1.645
Mean	1.777
Scale	0.926
stdev	0.828
Z_min/Location	0.189/24.3667°Lat 9.36667°Lon
Z_max/Location	3.660/ 29.1333°Lat 8.63333°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

Illizi Basin location map

Statistics - Plain crustal thickness
Median	38.768
Mean	38.958
Scale	0.831
stdev	0.723
Z_min/Location	37.953/28.0333°Lat 10.1333°Lon
Z_max/Location	40.441/ 26.3°Lat 11.0333°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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Base middle crust

Illizi Basin location map

Statistics - Base middle crust
Median	-25.968
Mean	-26.058
Scale	0.695
stdev	0.539
Z_min/Location	-26.997/24.3667°Lat 9.46667°Lon
Z_max/Location	-25.344/ 27.9°Lat 8.0°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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Base lower crust

Illizi Basin location map

Statistics - Base lower crust
Median	-38.656
Mean	-38.726
Scale	0.292
stdev	0.381
Z_min/Location	-40.312/29.1333°Lat 6.6°Lon
Z_max/Location	-38.229/ 27.6667°Lat 10.3667°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

Illizi Basin location map

Statistics - Total crustal thickness
Median	39.555
Mean	39.575
Scale	0.523
stdev	0.400
Z_min/Location	38.903/27.7667°Lat 10.3°Lon
Z_max/Location	40.966/ 26.3333°Lat 11.1°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

Illizi Basin location map

Statistics - Base upper crust
Median	-13.106
Mean	-13.188
Scale	0.378
stdev	0.340
Z_min/Location	-14.141/29.1333°Lat 6.6°Lon
Z_max/Location	-12.752/ 25.1667°Lat 8.13333°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

Illizi Basin location map

Statistics - Thermal lithospheric thickness
Median	169.469
Mean	167.661
Scale	23.687
stdev	19.297
Z_min/Location	129.710/29.1333°Lat 6.6°Lon
Z_max/Location	200.000/ 25.0°Lat 9.0°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

Illizi Basin location map

Statistics - Heatflow
Median	71.220
Mean	69.844
Scale	1.883
stdev	3.188
Z_min/Location	61.016/28.5333°Lat 6.06667°Lon
Z_max/Location	75.043/ 27.7667°Lat 10.3°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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Topography (ETOPO2)

Illizi Basin location map

Statistics - Topography (ETOPO2)
Median	553.000
Mean	650.082
Scale	112.678
stdev	296.130
Z_min/Location	271.000/29.1°Lat 7.5°Lon
Z_max/Location	1874.000/ 25.2°Lat 8.1°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

Illizi Basin location map

Statistics - Base hard sediments
Median	0.205
Mean	0.233
Scale	1.018
stdev	0.733
Z_min/Location	-0.951/29.1333°Lat 7.8°Lon
Z_max/Location	1.360/ 25.4667°Lat 9.1°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

Illizi Basin location map

Statistics - Temperature at 50km depth
Median	603.474
Mean	611.721
Scale	57.384
stdev	47.917
Z_min/Location	539.000/25.0°Lat 9.0°Lon
Z_max/Location	713.081/ 29.1333°Lat 6.6°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

Illizi Basin location map

Statistics - Laske sediment thickness
Median	0.882
Mean	1.042
Scale	0.532
stdev	0.591
Z_min/Location	-0.029/24.9333°Lat 8.8°Lon
Z_max/Location	2.480/ 29.1333°Lat 8.86667°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

Illizi Basin location map

Statistics - Lithospheric temperature gradient
Median	5.914
Mean	6.006
Scale	0.771
stdev	0.587
Z_min/Location	5.071/25.0°Lat 9.0°Lon
Z_max/Location	7.285/ 29.1333°Lat 6.6°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

Illizi Basin location map

Statistics - Isostatic correction
Median	0.375
Mean	0.438
Scale	0.221
stdev	0.242
Z_min/Location	0.000/25.0333°Lat 8.43333°Lon
Z_max/Location	1.013/29.1333°Lat 8.86667°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)

Illizi Basin location map

Statistics - TTS (sediment)
Median	-0.647
Mean	-0.670
Scale	0.740
stdev	0.529
Z_min/Location	-1.502/25.8333°Lat 9.2°Lon
Z_max/Location	0.367/28.6667°Lat 6.13333°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)

Illizi Basin location map

Statistics - Beta (Sediment)
Median	0.924
Mean	0.925
Scale	0.082
stdev	0.058
Z_min/Location	0.839/25.8333°Lat 9.2°Lon
Z_max/Location	1.049/28.6667°Lat 6.13333°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.

Illizi Basin location map

Statistics - Crustal vs lithosph. extn.
Median	-0.038
Mean	-0.073
Scale	0.113
stdev	0.117
Z_min/Location	-0.386/29.1333°Lat 6.6°Lon
Z_max/Location	0.089/24.3667°Lat 9.36667°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

Illizi Basin location map

Statistics - Anomalous TTS
Median	-0.900
Mean	-0.864
Scale	0.554
stdev	0.416
Z_min/Location	-1.495/25.9°Lat 9.2°Lon
Z_max/Location	0.129/28.8°Lat 6.26667°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

Illizi Basin location map

Statistics - Predicted elevation
Median	618.156
Mean	669.044
Scale	392.413
stdev	338.087
Z_min/Location	106.224/25.0°Lat 9.0°Lon
Z_max/Location	1397.710/29.1333°Lat 6.6°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)

Illizi Basin location map

Statistics - Beta (Crust)
Median	1.030
Mean	1.026
Scale	0.022
stdev	0.019
Z_min/Location	0.988/26.3°Lat 11.0333°Lon
Z_max/Location	1.053/28.0333°Lat 10.1333°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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TTS (crust)

Illizi Basin location map

Statistics - TTS (crust)
Median	0.231
Mean	0.194
Scale	0.163
stdev	0.141
Z_min/Location	-0.096/26.3°Lat 11.0333°Lon
Z_max/Location	0.391/28.0333°Lat 10.1333°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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Differential Beta

Illizi Basin location map

Statistics - Differential Beta
Median	-0.110
Mean	-0.101
Scale	0.049
stdev	0.043
Z_min/Location	-0.160/25.9333°Lat 9.2°Lon
Z_max/Location	0.018/28.8°Lat 6.26667°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