ICONS atlas: AFR - Nama-Kalahari Basins

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Overview

This page bundles the available data for the Nama-Kalahari Basins 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:
Nama-Kalahari Basins location map
Basin name Nama-Kalahari Basins
Region code AFR
Basin ID 7410
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.

Nama-Kalahari Basins cross section
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Dynamic topography evolution for basin centroid
Nama-Kalahari Basins 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
Nama-Kalahari Basins location map
Statistics - Mantle Lid thickness
Median 107.453
Mean 113.400
Scale 23.531
stdev 21.334
Z_min/Location 82.230/-20.0333°Lat 24.0333°Lon
Z_max/Location 155.770/ -18.9333°Lat 29.4333°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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Depth of 550 deg isotherm
Nama-Kalahari Basins location map
Statistics - Depth of 550 deg isotherm
Median -42.451
Mean -43.400
Scale 4.095
stdev 3.705
Z_min/Location -51.275/-18.9°Lat 29.4333°Lon
Z_max/Location -37.127/ -24.1°Lat 16.1°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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Mobil isopachs
Nama-Kalahari Basins location map
Statistics - Mobil isopachs
Median 0.741
Mean 0.789
Scale 1.005
stdev 0.846
Z_min/Location -1.314/-27.8667°Lat 17.1667°Lon
Z_max/Location 2.544/ -24.2333°Lat 21.3°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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Plain crustal thickness
Nama-Kalahari Basins location map
Statistics - Plain crustal thickness
Median 37.639
Mean 38.310
Scale 2.171
stdev 2.634
Z_min/Location 28.981/-27.1333°Lat 15.8667°Lon
Z_max/Location 43.977/ -28.0667°Lat 20.7333°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
Nama-Kalahari Basins location map
Statistics - Base middle crust
Median -26.966
Mean -26.786
Scale 2.922
stdev 2.272
Z_min/Location -31.442/-23.9°Lat 21.0333°Lon
Z_max/Location -21.695/ -24.3°Lat 16.0333°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 lower crust
Nama-Kalahari Basins location map
Statistics - Base lower crust
Median -39.995
Mean -39.305
Scale 2.955
stdev 2.641
Z_min/Location -42.960/-24.0°Lat 21.8333°Lon
Z_max/Location -31.297/ -27.8667°Lat 17.1667°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
Nama-Kalahari Basins location map
Statistics - Total crustal thickness
Median 41.088
Mean 40.318
Scale 2.991
stdev 2.741
Z_min/Location 31.397/-27.1333°Lat 15.8667°Lon
Z_max/Location 44.022/ -24.0°Lat 21.8333°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
Nama-Kalahari Basins location map
Statistics - Base upper crust
Median -13.179
Mean -13.914
Scale 1.717
stdev 2.194
Z_min/Location -19.759/-23.8°Lat 21.0667°Lon
Z_max/Location -10.617/ -24.0°Lat 16.1333°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
Nama-Kalahari Basins location map
Statistics - Thermal lithospheric thickness
Median 148.763
Mean 153.718
Scale 24.145
stdev 20.992
Z_min/Location 118.725/-24.0°Lat 16.1333°Lon
Z_max/Location 195.836/ -18.9333°Lat 29.4333°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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Heatflow
Nama-Kalahari Basins location map
Statistics - Heatflow
Median 50.522
Mean 51.779
Scale 2.352
stdev 3.823
Z_min/Location 47.549/-24.0667°Lat 24.1°Lon
Z_max/Location 69.119/ -27.2333°Lat 16.0°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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Topography (ETOPO2)
Nama-Kalahari Basins location map
Statistics - Topography (ETOPO2)
Median 1043.000
Mean 1060.670
Scale 131.951
stdev 151.560
Z_min/Location 434.000/-27.5°Lat 17.5667°Lon
Z_max/Location 1950.000/ -24.1667°Lat 16.2°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
Nama-Kalahari Basins location map
Statistics - Base hard sediments
Median 0.054
Mean -0.995
Scale 1.480
stdev 2.493
Z_min/Location -8.317/-23.8333°Lat 21.6°Lon
Z_max/Location 1.255/ -20.3333°Lat 26.7°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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Temperature at 50km depth
Nama-Kalahari Basins location map
Statistics - Temperature at 50km depth
Median 657.760
Mean 646.610
Scale 63.418
stdev 53.898
Z_min/Location 546.763/-18.9333°Lat 29.4333°Lon
Z_max/Location 750.229/ -24.0°Lat 16.1333°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
Nama-Kalahari Basins location map
Statistics - Laske sediment thickness
Median 0.759
Mean 2.359
Scale 0.763
stdev 3.246
Z_min/Location -0.002/-20.0667°Lat 28.6667°Lon
Z_max/Location 13.365/ -23.8333°Lat 20.6333°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
Nama-Kalahari Basins location map
Statistics - Lithospheric temperature gradient
Median 6.463
Mean 6.480
Scale 0.989
stdev 0.741
Z_min/Location 5.209/-18.9333°Lat 29.4333°Lon
Z_max/Location 7.971/ -24.0°Lat 16.1333°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
Nama-Kalahari Basins location map
Statistics - Isostatic correction
Median 0.323
Mean 0.857
Scale 0.322
stdev 1.060
Z_min/Location 0.000/-20.0667°Lat 28.5667°Lon
Z_max/Location 3.947/-23.8333°Lat 20.6333°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)
Nama-Kalahari Basins location map
Statistics - TTS (sediment)
Median -0.445
Mean 0.138
Scale 1.172
stdev 1.652
Z_min/Location -1.772/-21.2°Lat 24.0667°Lon
Z_max/Location 5.049/-23.3333°Lat 22.0667°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)
Nama-Kalahari Basins location map
Statistics - Beta (Sediment)
Median 0.946
Mean 1.095
Scale 0.125
stdev 0.374
Z_min/Location 0.815/-21.2°Lat 24.0667°Lon
Z_max/Location 2.822/-23.3333°Lat 22.0667°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.
Nama-Kalahari Basins location map
Statistics - Crustal vs lithosph. extn.
Median -0.203
Mean -0.199
Scale 0.229
stdev 0.165
Z_min/Location -0.472/-23.4667°Lat 17.7°Lon
Z_max/Location 0.084/-23.9°Lat 26.7333°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
Nama-Kalahari Basins location map
Statistics - Anomalous TTS
Median -0.027
Mean 0.282
Scale 1.275
stdev 1.460
Z_min/Location -2.004/-21.2°Lat 24.0667°Lon
Z_max/Location 4.519/-23.3°Lat 22.1667°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
Nama-Kalahari Basins location map
Statistics - Predicted elevation
Median 1041.850
Mean 940.711
Scale 483.599
stdev 415.492
Z_min/Location 33.986/-23.9°Lat 26.7333°Lon
Z_max/Location 1506.330/-20.0333°Lat 24.0333°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)
Nama-Kalahari Basins location map
Statistics - Beta (Crust)
Median 1.000
Mean 0.987
Scale 0.057
stdev 0.069
Z_min/Location 0.855/-28.0667°Lat 20.7333°Lon
Z_max/Location 1.298/-27.1333°Lat 15.8667°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)
Nama-Kalahari Basins location map
Statistics - TTS (crust)
Median -0.004
Mean -0.143
Scale 0.451
stdev 0.547
Z_min/Location -1.321/-28.0667°Lat 20.7333°Lon
Z_max/Location 1.796/-27.1333°Lat 15.8667°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
Nama-Kalahari Basins location map
Statistics - Differential Beta
Median -0.003
Mean 0.108
Scale 0.153
stdev 0.348
Z_min/Location -0.215/-21.2°Lat 24.1°Lon
Z_max/Location 1.748/-23.3333°Lat 22.0667°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