ICONS atlas: AFR - Ahnet Basin

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Overview

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

Basin name	Ahnet Basin
Region code	AFR
Basin ID	7190
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.

Ahnet Basin cross section

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Dynamic topography evolution for basin centroid

Ahnet 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

Ahnet Basin location map

Statistics - Mantle Lid thickness
Median	136.014
Mean	135.277
Scale	8.905
stdev	8.490
Z_min/Location	113.074/27.1333°Lat 1.33333°Lon
Z_max/Location	153.364/ 24.2°Lat 2.9°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

Ahnet Basin location map

Statistics - Depth of 550 deg isotherm
Median	-47.041
Mean	-46.932
Scale	1.761
stdev	1.694
Z_min/Location	-50.591/24.2°Lat 2.9°Lon
Z_max/Location	-42.799/ 27.1333°Lat 1.33333°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

Ahnet Basin location map

Statistics - Mobil isopachs
Median	1.834
Mean	1.884
Scale	0.440
stdev	0.602
Z_min/Location	0.387/24.2°Lat 2.9°Lon
Z_max/Location	3.992/ 27.0333°Lat 1.7°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

Ahnet Basin location map

Statistics - Plain crustal thickness
Median	37.356
Mean	37.365
Scale	1.715
stdev	1.430
Z_min/Location	34.309/27.0333°Lat 2.2°Lon
Z_max/Location	40.088/ 24.2°Lat 2.9°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

Ahnet Basin location map

Statistics - Base middle crust
Median	-25.769
Mean	-25.879
Scale	0.954
stdev	0.813
Z_min/Location	-27.662/24.2°Lat 2.86667°Lon
Z_max/Location	-24.390/ 27.1667°Lat 2.7°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

Ahnet Basin location map

Statistics - Base lower crust
Median	-38.138
Mean	-38.185
Scale	0.902
stdev	0.786
Z_min/Location	-39.689/24.2°Lat 2.86667°Lon
Z_max/Location	-36.115/ 27.1667°Lat 2.7°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

Ahnet Basin location map

Statistics - Total crustal thickness
Median	38.437
Mean	38.499
Scale	0.937
stdev	0.816
Z_min/Location	36.437/27.1667°Lat 2.7°Lon
Z_max/Location	40.073/ 24.2°Lat 2.9°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

Ahnet Basin location map

Statistics - Base upper crust
Median	-13.384
Mean	-13.401
Scale	0.150
stdev	0.135
Z_min/Location	-13.904/27.1333°Lat 1.33333°Lon
Z_max/Location	-13.194/ 25.8333°Lat 2.1°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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Thermal lithospheric thickness

Ahnet Basin location map

Statistics - Thermal lithospheric thickness
Median	174.480
Mean	173.775
Scale	9.839
stdev	9.257
Z_min/Location	150.556/27.1333°Lat 1.33333°Lon
Z_max/Location	193.437/ 24.2°Lat 2.9°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

Ahnet Basin location map

Statistics - Heatflow
Median	53.955
Mean	54.255
Scale	2.275
stdev	1.888
Z_min/Location	51.434/24.3667°Lat 1.6°Lon
Z_max/Location	58.699/ 25.9333°Lat 3.3°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)

Ahnet Basin location map

Statistics - Topography (ETOPO2)
Median	299.000
Mean	306.138
Scale	84.508
stdev	111.567
Z_min/Location	110.000/26.1°Lat 1.53333°Lon
Z_max/Location	915.000/ 24.8°Lat 2.8°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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Base hard sediments

Ahnet Basin location map

Statistics - Base hard sediments
Median	-0.771
Mean	-0.820
Scale	0.770
stdev	0.658
Z_min/Location	-2.400/27.1667°Lat 1.56667°Lon
Z_max/Location	0.401/ 24.2°Lat 2.9°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

Ahnet Basin location map

Statistics - Temperature at 50km depth
Median	590.309
Mean	593.531
Scale	22.271
stdev	21.703
Z_min/Location	551.873/24.2°Lat 2.9°Lon
Z_max/Location	652.701/ 27.1333°Lat 1.33333°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

Ahnet Basin location map

Statistics - Laske sediment thickness
Median	0.974
Mean	1.154
Scale	0.724
stdev	0.719
Z_min/Location	0.060/24.2°Lat 2.9°Lon
Z_max/Location	3.090/ 27.1667°Lat 1.56667°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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Lithospheric temperature gradient

Ahnet Basin location map

Statistics - Lithospheric temperature gradient
Median	5.725
Mean	5.792
Scale	0.344
stdev	0.325
Z_min/Location	5.256/24.2°Lat 2.9°Lon
Z_max/Location	6.705/ 26.9°Lat 1.03333°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

Ahnet Basin location map

Statistics - Isostatic correction
Median	0.413
Mean	0.482
Scale	0.301
stdev	0.291
Z_min/Location	0.026/24.2°Lat 2.9°Lon
Z_max/Location	1.242/27.1667°Lat 1.56667°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)

Ahnet Basin location map

Statistics - TTS (sediment)
Median	0.364
Mean	0.338
Scale	0.440
stdev	0.376
Z_min/Location	-0.429/24.2°Lat 2.86667°Lon
Z_max/Location	1.161/27.1667°Lat 1.5°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 (Sediment)

Ahnet Basin location map

Statistics - Beta (Sediment)
Median	1.049
Mean	1.048
Scale	0.062
stdev	0.053
Z_min/Location	0.948/24.2°Lat 2.86667°Lon
Z_max/Location	1.174/27.1667°Lat 1.5°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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Crustal vs lithosph. extn.

Ahnet Basin location map

Statistics - Crustal vs lithosph. extn.
Median	0.016
Mean	0.012
Scale	0.018
stdev	0.021
Z_min/Location	-0.099/26.8°Lat 0.833333°Lon
Z_max/Location	0.047/24.2°Lat 2.9°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

Ahnet Basin location map

Statistics - Anomalous TTS
Median	0.154
Mean	0.127
Scale	0.076
stdev	0.099
Z_min/Location	-0.111/25.9333°Lat 3.3°Lon
Z_max/Location	0.428/27.1333°Lat 1.33333°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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Predicted elevation

Ahnet Basin location map

Statistics - Predicted elevation
Median	470.376
Mean	484.285
Scale	105.867
stdev	111.416
Z_min/Location	239.129/24.2°Lat 2.9°Lon
Z_max/Location	847.582/26.8°Lat 0.833333°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)

Ahnet Basin location map

Statistics - Beta (Crust)
Median	1.028
Mean	1.029
Scale	0.047
stdev	0.040
Z_min/Location	0.958/24.2°Lat 2.9°Lon
Z_max/Location	1.119/27.0333°Lat 2.2°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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TTS (crust)

Ahnet Basin location map

Statistics - TTS (crust)
Median	0.212
Mean	0.211
Scale	0.349
stdev	0.291
Z_min/Location	-0.344/24.2°Lat 2.9°Lon
Z_max/Location	0.833/27.0333°Lat 2.2°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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Differential Beta

Ahnet Basin location map

Statistics - Differential Beta
Median	0.021
Mean	0.019
Scale	0.013
stdev	0.015
Z_min/Location	-0.014/26.6°Lat 3.2°Lon
Z_max/Location	0.070/27.1333°Lat 1.33333°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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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