Description of the VRML files

Topography of the modelled area
Topography (green). Approximately 50 km². 10x exaggeration of height.

The major lineaments and boundaries of the ZEV

Scale: depth approx. 10 km.
Elements:


Down-dip projection of foliation planes in the Moldanubian

Scale: depth approx. 10 km.
Elements:
These three surfaces were produced by the following method:
1. Foliation traces were constructed from 1:25000 geological maps
2. Strike lines for depths down to 10 km, spacing 1 km, were constructed around the trace line using the various dips of the foliation.
3. The strike lines were set to the correct depth and splined to give the surfaces seen here.

These down-dip projections were used as passive markers in the model. Analysis of these surfaces gave information to the orientation of existing fabrics after "retro-deformation".


Down-dip projection of foliation in the ZEV.

Scale: Frankonian Lineament is 35 km long.
Elements:
Down/dip projections of the ZEV foliation (yellow and green surfaces; for method see above)
Frankonian Lineament (olive green; down to 10 km)
Luhe Lineament (red; down to 10 km)
Outline of Leuchtenberg and Falkenberg Granites (red; down to 8 km)


Picked seismic surfaces

Scale: Model is approx. a 12 km cube
Elements:
All surfaces were picked from migrated inline seismic traces of the ISO '89 seismic survey. These are interpreted as:
green - the Frankonian Lineament, pink & red -  "B" surfaces (senso Wiederhold 1992; KTB Report 92-5), yellow - unknown surface
purple - base of the Carboniferous sediments west of the Frankonian L.

Mainly these data were used to verify the depth continuation of the Frankonian Lineament.


Seismic interpretation of the ISO '89 data (timeslices)

Scale: Frankonian Lineament is 35 km long
Elements:
Frankonian Lineament (dark red) projected from the surface outcrop on a vector of 055/55 to a depth of 10 km.

All other surfaces were picked from migrated timesections of the ISO '89 seismic survey. These are interpreted as:
SE1 - SE4-5 (after Wiederhold 1992; KTB Report 92-5). They are all probably parallel equivalents to the Frankonian Lineament.

Note how these timesection surfaces fit very well to the projection of the Frankonian Lineament. 


The Dogger/Malm sedimentary contact west of the Frankonian Lineament

Scale: Frankonian Lineament is 35 km long
Elements:
The Dogger/Malm contact west of the Frankonian Lineament, split into 4 "lands" (green, yellow, brown, and red) separated by faults (parallel the Frankonian L. and the Luhe Lineament) shown in grey.
Vertical and lateral offsets of the blocks is approx. 500 m and 800 m, respectively.

This model was used to determine the kinematics of the Upper Cretaceous event. The best restoration path for these blocks is direct northwards lateral displacement and then a purely vertical component.


The present geometrical ZEV model (without topography)

Scale: Frankonian Lineament is 35 km long
Elements:
Frankonian Lineament (blue), Luhe Lineament (light green), both faults at depth continue at depth (~10 km) into a detachment which dips eastwards by 10°; pink)
Down/dip projections of the ZEV foliation (yellow surfaces; for method see above)
Outline of Leuchtenberg, Flossenbürg and Falkenberg Granites (red; down to 8 km), Moldanubian/ZEV boundary and Erbendorf Lineament (orange-brown)


Model of the ZEV, after removing the Upper Cretaceous deformation

Scale: Frankonian Lineament is 35 km long.
Elements:
Present topographies of the Southern German Basin (yellow), ZEV (green), Moldanubian (brown)
Frankonian Lineament (blue), Luhe Lineament (light green), both faults at depth continue at depth (~10 km) into a detachment which dips eastwards by 10°; pink)

Deformation:
The hanging wall (the topographies of the ZEV and the Moldanubian) and passive elements of the ZEV has been moved direct northwards above the combined faults of the Frankonian L., Luhe L. and the detachment. The deformation of the hanging wall was achieved with inclined shear, shear vector 245/60. This is the opposite kinematic framework to that of the Upper Cretaceous. 7 km hanging wall displacement (as seen here), satisfied geological and geophysical criteria. Hence the model shows the situation of the present-day topographies before the start of the Upper Cretaceous. For more information see Tanner et al. (Sp. Pub. Geol. Soc. London 1998).


Model of the ZEV, after removing the Falkenberg Granite (strain method)

Scale: Frankonian Lineament is 35 km long.
Elements:
Present topographies of the Southern German Basin (yellow), ZEV (green), Moldanubian (brown)
Frankonian Lineament (blue), Luhe Lineament (light green), both faults at depth continue at depth (~10 km) into a detachment which dips eastwards by 10°; pink)

Retro-deformation:
The Upper Carboniferous Falkenberg Granite was removed from the ZEV model using a strain tool, whereby the granite pluton is drawn downwards out of the ZEV. This method is appropriate if a ductile, active emplacement of the granite can be assumed.



 

Model of the ZEV, after removing the Falkenberg and Flossenbürg Granites (strain method)

Scale: Frankonian Lineament is 35 km long.
Elements:
Present topographies of the Southern German Basin (yellow), ZEV (green), Moldanubian (brown)
Frankonian Lineament (blue), Luhe Lineament (light green), both faults at depth continue at depth (~10 km) into a detachment which dips eastwards by 10°; pink)

Retro-deformation:
The Upper Carboniferous Falkenberg and Flossenbürg Granites were removed from the ZEV model using a strain tool, whereby the granite plutons were drawn downwards out of the ZEV. This method is appropriate if a ductile, active emplacement of the granites can be assumed.



 

Model of the ZEV, after removing the Falkenberg Granite (volume method)

Scale: Frankonian Lineament is 35 km long.
Elements:
Present topographies of the Southern German Basin (yellow), ZEV (green), Moldanubian (brown)
Frankonian Lineament (blue), Luhe Lineament (light green), both faults at depth continue at depth (~10 km) into a detachment which dips eastwards by 10°; pink)

Retro-deformation:
The Upper Carboniferous Falkenberg Granite was removed from the ZEV model using a volume constant tool, whereby the granite pluton is drawn downwards out of the ZEV and only objects directly above the granite are affected. This method is appropriate if a brittle, volume-constant emplacement of the granite can be assumed.



David Tanner, last updated 20th January.