ICONS atlas: AFR - Anambra Basin

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Overview

This page bundles the available data for the Anambra 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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Anambra Basin location map
Basin name Anambra Basin
Region code AFR
Basin ID 7710
Plate location/code pasv divrg cont marg/PDC
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.

Anambra Basin cross section
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Dynamic topography evolution for basin centroid
Anambra 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
Anambra Basin location map
Statistics - Mantle Lid thickness
Median 84.168
Mean 84.188
Scale 13.129
stdev 10.472
Z_min/Location 65.218/6.33333°Lat 7.8°Lon
Z_max/Location 107.069/ 8.23333°Lat 7.33333°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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Depth of 550 deg isotherm
Anambra Basin location map
Statistics - Depth of 550 deg isotherm
Median -37.187
Mean -37.171
Scale 2.523
stdev 2.005
Z_min/Location -41.416/8.23333°Lat 7.33333°Lon
Z_max/Location -33.405/ 5.83333°Lat 7.36667°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
Anambra Basin location map
Statistics - Mobil isopachs
Median 2.287
Mean 2.352
Scale 1.839
stdev 1.664
Z_min/Location -0.579/8.7°Lat 8.76667°Lon
Z_max/Location 7.638/ 5.83333°Lat 7.36667°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
Anambra Basin location map
Statistics - Plain crustal thickness
Median 36.159
Mean 35.275
Scale 1.293
stdev 2.126
Z_min/Location 27.490/5.83333°Lat 7.36667°Lon
Z_max/Location 37.266/ 8.33333°Lat 7.73333°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
Anambra Basin location map
Statistics - Base middle crust
Median -27.336
Mean -27.569
Scale 1.195
stdev 1.028
Z_min/Location -29.925/6.46667°Lat 7.93333°Lon
Z_max/Location -25.892/ 7.23333°Lat 6.56667°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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Base lower crust
Anambra Basin location map
Statistics - Base lower crust
Median -38.774
Mean -38.877
Scale 0.697
stdev 0.806
Z_min/Location -40.748/6.76667°Lat 8.2°Lon
Z_max/Location -36.220/ 7.23333°Lat 6.56667°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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Total crustal thickness
Anambra Basin location map
Statistics - Total crustal thickness
Median 38.978
Mean 39.076
Scale 0.692
stdev 0.827
Z_min/Location 36.258/5.83333°Lat 7.36667°Lon
Z_max/Location 40.994/ 6.76667°Lat 8.2°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 upper crust
Anambra Basin location map
Statistics - Base upper crust
Median -15.797
Mean -16.261
Scale 1.745
stdev 1.664
Z_min/Location -19.839/6.16667°Lat 7.63333°Lon
Z_max/Location -14.199/ 8.3°Lat 7.46667°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
Anambra Basin location map
Statistics - Thermal lithospheric thickness
Median 123.271
Mean 123.263
Scale 12.261
stdev 10.030
Z_min/Location 103.342/5.83333°Lat 7.36667°Lon
Z_max/Location 145.614/ 8.23333°Lat 7.33333°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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Heatflow
Anambra Basin location map
Statistics - Heatflow
Median 75.969
Mean 76.510
Scale 2.297
stdev 2.414
Z_min/Location 73.181/8.36667°Lat 7.86667°Lon
Z_max/Location 83.387/ 6.06667°Lat 7.26667°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)
Anambra Basin location map
Statistics - Topography (ETOPO2)
Median 153.000
Mean 195.775
Scale 32.617
stdev 85.102
Z_min/Location 55.000/7.26667°Lat 6.66667°Lon
Z_max/Location 543.000/ 8.2°Lat 8.2°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
Anambra Basin location map
Statistics - Base hard sediments
Median -3.033
Mean -3.602
Scale 2.019
stdev 2.077
Z_min/Location -8.912/5.83333°Lat 7.36667°Lon
Z_max/Location -1.117/ 8.3°Lat 7.46667°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
Anambra Basin location map
Statistics - Temperature at 50km depth
Median 751.135
Mean 752.953
Scale 51.151
stdev 41.089
Z_min/Location 673.782/8.2°Lat 7.26667°Lon
Z_max/Location 845.291/ 5.83333°Lat 7.36667°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
Anambra Basin location map
Statistics - Laske sediment thickness
Median 2.884
Mean 3.218
Scale 1.137
stdev 1.545
Z_min/Location 0.817/8.06667°Lat 7.13333°Lon
Z_max/Location 9.023/ 5.83333°Lat 7.36667°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
Anambra Basin location map
Statistics - Lithospheric temperature gradient
Median 7.965
Mean 7.871
Scale 0.696
stdev 0.582
Z_min/Location 6.557/8.06667°Lat 7.13333°Lon
Z_max/Location 9.108/ 7.0°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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Computations

Isostatic correction
Anambra Basin location map
Statistics - Isostatic correction
Median 1.166
Mean 1.265
Scale 0.427
stdev 0.535
Z_min/Location 0.348/8.06667°Lat 7.13333°Lon
Z_max/Location 3.072/5.83333°Lat 7.36667°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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TTS (sediment)
Anambra Basin location map
Statistics - TTS (sediment)
Median 1.941
Mean 2.337
Scale 1.736
stdev 1.600
Z_min/Location 0.424/8.7°Lat 8.76667°Lon
Z_max/Location 5.857/6.0°Lat 7.5°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)
Anambra Basin location map
Statistics - Beta (Sediment)
Median 1.330
Mean 1.614
Scale 0.350
stdev 0.682
Z_min/Location 1.057/8.7°Lat 8.76667°Lon
Z_max/Location 3.984/6.0°Lat 7.5°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.
Anambra Basin location map
Statistics - Crustal vs lithosph. extn.
Median -0.084
Mean -0.092
Scale 0.081
stdev 0.071
Z_min/Location -0.274/7.2°Lat 8.63333°Lon
Z_max/Location 0.063/7.23333°Lat 6.56667°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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Anomalous TTS
Anambra Basin location map
Statistics - Anomalous TTS
Median 2.675
Mean 2.907
Scale 1.346
stdev 1.147
Z_min/Location 1.343/8.73333°Lat 8.93333°Lon
Z_max/Location 5.363/6.33333°Lat 7.8°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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Predicted elevation
Anambra Basin location map
Statistics - Predicted elevation
Median 1403.150
Mean 1404.070
Scale 238.443
stdev 195.274
Z_min/Location 1003.810/8.2°Lat 7.26667°Lon
Z_max/Location 1779.360/6.5°Lat 7.96667°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)
Anambra Basin location map
Statistics - Beta (Crust)
Median 0.909
Mean 0.936
Scale 0.032
stdev 0.062
Z_min/Location 0.882/8.33333°Lat 7.73333°Lon
Z_max/Location 1.196/5.83333°Lat 7.36667°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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TTS (crust)
Anambra Basin location map
Statistics - TTS (crust)
Median -0.781
Mean -0.570
Scale 0.308
stdev 0.506
Z_min/Location -1.044/8.33333°Lat 7.73333°Lon
Z_max/Location 1.281/5.83333°Lat 7.36667°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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Differential Beta
Anambra Basin location map
Statistics - Differential Beta
Median 0.418
Mean 0.678
Scale 0.310
stdev 0.624
Z_min/Location 0.163/8.73333°Lat 8.93333°Lon
Z_max/Location 2.861/6.03333°Lat 7.53333°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