ICONS atlas: AFR - Bechar Basin

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Overview

This page bundles the available data for the Bechar 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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Bechar Basin location map
Basin name Bechar Basin
Region code AFR
Basin ID 7120
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.

Bechar Basin cross section
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Dynamic topography evolution for basin centroid
Bechar 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
Bechar Basin location map
Statistics - Mantle Lid thickness
Median 63.961
Mean 63.919
Scale 0.178
stdev 0.173
Z_min/Location 63.469/31.6667°Lat -2.93333°Lon
Z_max/Location 64.218/ 32.0667°Lat -1.9°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
Bechar Basin location map
Statistics - Depth of 550 deg isotherm
Median -34.000
Mean -34.001
Scale 0.000
stdev 0.003
Z_min/Location -34.004/31.6667°Lat -2.06667°Lon
Z_max/Location -34.000/ 31.6667°Lat -2.93333°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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Mobil isopachs
Bechar Basin location map
Statistics - Mobil isopachs
Median 1.609
Mean 1.701
Scale 0.425
stdev 0.436
Z_min/Location 1.074/32.0667°Lat -2.86667°Lon
Z_max/Location 3.040/ 31.6333°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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Plain crustal thickness
Bechar Basin location map
Statistics - Plain crustal thickness
Median 31.986
Mean 32.032
Scale 0.804
stdev 0.669
Z_min/Location 30.911/32.0667°Lat -1.9°Lon
Z_max/Location 33.767/ 31.6667°Lat -2.93333°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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Base middle crust
Bechar Basin location map
Statistics - Base middle crust
Median -25.262
Mean -25.264
Scale 0.191
stdev 0.196
Z_min/Location -25.669/31.6333°Lat -2.1°Lon
Z_max/Location -24.779/ 32.0667°Lat -2.86667°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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Base lower crust
Bechar Basin location map
Statistics - Base lower crust
Median -35.425
Mean -35.472
Scale 0.314
stdev 0.263
Z_min/Location -36.013/31.6333°Lat -2.1°Lon
Z_max/Location -35.062/ 32.0667°Lat -2.86667°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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Total crustal thickness
Bechar Basin location map
Statistics - Total crustal thickness
Median 36.205
Mean 36.239
Scale 0.297
stdev 0.239
Z_min/Location 35.922/32.0667°Lat -2.7°Lon
Z_max/Location 36.719/ 31.6333°Lat -2.63333°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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Base upper crust
Bechar Basin location map
Statistics - Base upper crust
Median -14.783
Mean -14.683
Scale 0.601
stdev 0.517
Z_min/Location -15.388/31.7333°Lat -2.03333°Lon
Z_max/Location -13.469/ 32.0333°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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Thermal lithospheric thickness
Bechar Basin location map
Statistics - Thermal lithospheric thickness
Median 100.130
Mean 100.158
Scale 0.083
stdev 0.097
Z_min/Location 100.000/32.0°Lat -2.0°Lon
Z_max/Location 100.470/ 31.6333°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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Heatflow
Bechar Basin location map
Statistics - Heatflow
Median 69.419
Mean 69.430
Scale 0.578
stdev 0.480
Z_min/Location 68.485/31.6333°Lat -2.1°Lon
Z_max/Location 70.363/ 32.0667°Lat -2.86667°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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Topography (ETOPO2)
Bechar Basin location map
Statistics - Topography (ETOPO2)
Median 844.000
Mean 877.164
Scale 83.026
stdev 131.113
Z_min/Location 705.000/31.7°Lat -2.76667°Lon
Z_max/Location 1861.000/ 31.9667°Lat -1.96667°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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Base hard sediments
Bechar Basin location map
Statistics - Base hard sediments
Median -3.529
Mean -3.440
Scale 0.789
stdev 0.642
Z_min/Location -4.352/31.9°Lat -1.93333°Lon
Z_max/Location -2.040/ 32.0333°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
Bechar Basin location map
Statistics - Temperature at 50km depth
Median 832.550
Mean 832.442
Scale 0.309
stdev 0.359
Z_min/Location 831.259/31.6333°Lat -2.1°Lon
Z_max/Location 833.000/ 32.0°Lat -2.0°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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Laske sediment thickness
Bechar Basin location map
Statistics - Laske sediment thickness
Median 6.891
Mean 6.888
Scale 0.611
stdev 0.511
Z_min/Location 5.597/32.0667°Lat -1.9°Lon
Z_max/Location 7.716/ 31.9667°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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Lithospheric temperature gradient
Bechar Basin location map
Statistics - Lithospheric temperature gradient
Median 9.308
Mean 9.304
Scale 0.014
stdev 0.016
Z_min/Location 9.255/31.6333°Lat -2.1°Lon
Z_max/Location 9.332/ 32.0°Lat -2.0°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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Computations

Isostatic correction
Bechar Basin location map
Statistics - Isostatic correction
Median 2.499
Mean 2.495
Scale 0.175
stdev 0.149
Z_min/Location 2.105/32.0667°Lat -1.9°Lon
Z_max/Location 2.732/31.9667°Lat -2.8°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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TTS (sediment)
Bechar Basin location map
Statistics - TTS (sediment)
Median 1.024
Mean 0.945
Scale 0.975
stdev 0.773
Z_min/Location -0.660/32.0333°Lat -2.9°Lon
Z_max/Location 2.164/32.0667°Lat -1.9°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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Beta (Sediment)
Bechar Basin location map
Statistics - Beta (Sediment)
Median 1.151
Mean 1.152
Scale 0.160
stdev 0.128
Z_min/Location 0.922/32.0333°Lat -2.9°Lon
Z_max/Location 1.383/32.0667°Lat -1.9°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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Crustal vs lithosph. extn.
Bechar Basin location map
Statistics - Crustal vs lithosph. extn.
Median 0.033
Mean 0.032
Scale 0.026
stdev 0.022
Z_min/Location -0.022/31.6667°Lat -2.93333°Lon
Z_max/Location 0.069/32.0667°Lat -1.9°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
Bechar Basin location map
Statistics - Anomalous TTS
Median 0.781
Mean 0.710
Scale 0.795
stdev 0.633
Z_min/Location -0.650/32.0333°Lat -2.9°Lon
Z_max/Location 1.668/31.9667°Lat -1.9°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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Predicted elevation
Bechar Basin location map
Statistics - Predicted elevation
Median 1531.780
Mean 1534.470
Scale 21.957
stdev 17.686
Z_min/Location 1510.650/32.0667°Lat -2.43333°Lon
Z_max/Location 1570.810/31.6333°Lat -2.63333°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)
Bechar Basin location map
Statistics - Beta (Crust)
Median 1.032
Mean 1.031
Scale 0.026
stdev 0.021
Z_min/Location 0.978/31.6667°Lat -2.93333°Lon
Z_max/Location 1.068/32.0667°Lat -1.9°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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TTS (crust)
Bechar Basin location map
Statistics - TTS (crust)
Median 0.245
Mean 0.234
Scale 0.190
stdev 0.158
Z_min/Location -0.177/31.6667°Lat -2.93333°Lon
Z_max/Location 0.500/32.0667°Lat -1.9°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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Differential Beta
Bechar Basin location map
Statistics - Differential Beta
Median 0.119
Mean 0.120
Scale 0.143
stdev 0.109
Z_min/Location -0.077/32.0333°Lat -2.9°Lon
Z_max/Location 0.314/32.0667°Lat -1.9°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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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