ICONS atlas: AFR - Voltaian Basin

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Overview

This page bundles the available data for the Voltaian 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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Voltaian Basin location map
Basin name Voltaian Basin
Region code AFR
Basin ID 7420
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.

Voltaian Basin cross section
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Dynamic topography evolution for basin centroid
Voltaian 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
Voltaian Basin location map
Statistics - Mantle Lid thickness
Median 146.193
Mean 146.263
Scale 7.817
stdev 7.353
Z_min/Location 117.746/12.5667°Lat 2.76667°Lon
Z_max/Location 160.000/ 8.0°Lat 0.0°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
Voltaian Basin location map
Statistics - Depth of 550 deg isotherm
Median -48.865
Mean -48.816
Scale 1.124
stdev 1.310
Z_min/Location -52.000/8.0°Lat 0.0°Lon
Z_max/Location -43.194/ 12.5667°Lat 2.76667°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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Mobil isopachs
Voltaian Basin location map
Statistics - Mobil isopachs
Median 0.438
Mean 1.090
Scale 0.936
stdev 1.353
Z_min/Location -0.598/11.9667°Lat 2.0°Lon
Z_max/Location 3.822/ 8.36667°Lat -0.933333°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
Voltaian Basin location map
Statistics - Plain crustal thickness
Median 38.412
Mean 37.967
Scale 0.538
stdev 1.388
Z_min/Location 30.841/6.1°Lat -0.233333°Lon
Z_max/Location 39.570/ 8.86667°Lat 0.4°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
Voltaian Basin location map
Statistics - Base middle crust
Median -25.826
Mean -25.685
Scale 0.243
stdev 0.561
Z_min/Location -26.678/9.86667°Lat 0.866667°Lon
Z_max/Location -22.836/ 6.1°Lat -0.233333°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
Voltaian Basin location map
Statistics - Base lower crust
Median -38.840
Mean -38.524
Scale 0.466
stdev 1.130
Z_min/Location -40.239/10.1°Lat 0.933333°Lon
Z_max/Location -32.875/ 6.1°Lat -0.233333°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
Voltaian Basin location map
Statistics - Total crustal thickness
Median 39.055
Mean 38.669
Scale 0.518
stdev 1.311
Z_min/Location 31.951/6.1°Lat -0.233333°Lon
Z_max/Location 40.482/ 10.1°Lat 0.933333°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
Voltaian Basin location map
Statistics - Base upper crust
Median -12.922
Mean -13.016
Scale 0.323
stdev 0.363
Z_min/Location -13.840/10.0°Lat 0.0°Lon
Z_max/Location -12.019/ 6.1°Lat -0.233333°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
Voltaian Basin location map
Statistics - Thermal lithospheric thickness
Median 185.143
Mean 184.932
Scale 7.322
stdev 7.083
Z_min/Location 156.245/12.5667°Lat 2.76667°Lon
Z_max/Location 199.000/ 8.0°Lat 0.0°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
Voltaian Basin location map
Statistics - Heatflow
Median 60.681
Mean 61.467
Scale 2.640
stdev 2.876
Z_min/Location 55.991/9.66667°Lat -1.83333°Lon
Z_max/Location 69.578/ 12.0333°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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Topography (ETOPO2)
Voltaian Basin location map
Statistics - Topography (ETOPO2)
Median 151.000
Mean 168.469
Scale 42.995
stdev 74.955
Z_min/Location 78.000/7.93333°Lat 0.0666667°Lon
Z_max/Location 619.000/ 6.63333°Lat -0.8°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
Voltaian Basin location map
Statistics - Base hard sediments
Median -0.491
Mean -0.557
Scale 0.264
stdev 0.319
Z_min/Location -2.035/6.1°Lat -0.233333°Lon
Z_max/Location -0.095/ 8.7°Lat -1.93333°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
Voltaian Basin location map
Statistics - Temperature at 50km depth
Median 568.600
Mean 570.017
Scale 13.386
stdev 15.676
Z_min/Location 542.000/8.0°Lat 0.0°Lon
Z_max/Location 642.471/ 12.5333°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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Laske sediment thickness
Voltaian Basin location map
Statistics - Laske sediment thickness
Median 1.070
Mean 1.034
Scale 0.885
stdev 0.654
Z_min/Location -0.110/6.8°Lat -1.16667°Lon
Z_max/Location 2.117/ 8.36667°Lat -0.1°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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Lithospheric temperature gradient
Voltaian Basin location map
Statistics - Lithospheric temperature gradient
Median 5.404
Mean 5.441
Scale 0.129
stdev 0.174
Z_min/Location 5.104/8.0°Lat 0.0°Lon
Z_max/Location 6.311/ 12.3333°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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Computations

Isostatic correction
Voltaian Basin location map
Statistics - Isostatic correction
Median 0.453
Mean 0.434
Scale 0.364
stdev 0.269
Z_min/Location 0.000/7.7°Lat -2.03333°Lon
Z_max/Location 0.873/8.36667°Lat -0.1°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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TTS (sediment)
Voltaian Basin location map
Statistics - TTS (sediment)
Median 0.043
Mean 0.123
Scale 0.236
stdev 0.449
Z_min/Location -0.587/8.26667°Lat 0.0°Lon
Z_max/Location 2.013/6.1°Lat -0.233333°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)
Voltaian Basin location map
Statistics - Beta (Sediment)
Median 1.006
Mean 1.020
Scale 0.030
stdev 0.066
Z_min/Location 0.930/8.26667°Lat 0.0°Lon
Z_max/Location 1.347/6.1°Lat -0.233333°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.
Voltaian Basin location map
Statistics - Crustal vs lithosph. extn.
Median 0.030
Mean 0.040
Scale 0.047
stdev 0.059
Z_min/Location -0.139/12.5667°Lat 2.76667°Lon
Z_max/Location 0.208/6.16667°Lat -0.3°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
Voltaian Basin location map
Statistics - Anomalous TTS
Median 0.069
Mean 0.045
Scale 0.241
stdev 0.243
Z_min/Location -0.502/8.13333°Lat -0.0333333°Lon
Z_max/Location 0.633/6.8°Lat -1.16667°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
Voltaian Basin location map
Statistics - Predicted elevation
Median 323.422
Mean 294.513
Scale 154.862
stdev 173.094
Z_min/Location -111.128/6.6°Lat -0.8°Lon
Z_max/Location 818.126/12.8333°Lat 2.56667°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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Beta (Crust)
Voltaian Basin location map
Statistics - Beta (Crust)
Median 0.998
Mean 1.012
Scale 0.014
stdev 0.040
Z_min/Location 0.969/8.86667°Lat 0.4°Lon
Z_max/Location 1.244/6.1°Lat -0.233333°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)
Voltaian Basin location map
Statistics - TTS (crust)
Median -0.013
Mean 0.078
Scale 0.110
stdev 0.283
Z_min/Location -0.249/8.86667°Lat 0.4°Lon
Z_max/Location 1.531/6.1°Lat -0.233333°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
Voltaian Basin location map
Statistics - Differential Beta
Median 0.009
Mean 0.008
Scale 0.032
stdev 0.035
Z_min/Location -0.060/8.1°Lat -0.0666667°Lon
Z_max/Location 0.113/6.6°Lat -0.8°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