GSI3D model metadata report for HS2 Area 7 (Hampton in Arden to Drayton Bassett) Geology and Regional Geophysics Open Report OR/15/073 BRITISH GEOLOGICAL SURVEY GEOLOGY AND REGIONAL GEOPHYSICS PROGRAMME OPEN REPORT OR/15/073 GSI3D model metadata report for HS2 Area 7 (Hampton in Arden to Drayton Bassett) The National Grid and other Ordnance Survey data © Crown Copyright and database rights K. Ambrose 2017. Ordnance Survey Licence No. 100021290. Edits by A. M. Barron, H. Burke and H. V. Gow Keywords Report; 3D model; GSI3D; HS2; linear route National Grid Reference SW corner 41690 27963 Centre point 41909 29226 NE corner 42074 30367 Map Sheets 154, 168, 169 Bibliographical reference AMBROSE, K. 2017. GSI3D model metadata report for HS2 Area 7 (Hampton in Arden to Drayton Bassett). British Geological Survey Open Report, OR/15/073. 22pp. Copyright in materials derived from the British Geological Survey’s work is owned by the Natural Environment Research Council (NERC) and/or the authority that commissioned the work. You may not copy or adapt this publication without first obtaining permission. Contact the BGS Intellectual Property Rights Section, British Geological Survey, Keyworth, e-mail [email protected]. You may quote extracts of a reasonable length without prior permission, provided a full acknowledgement is given of the source of the extract. Maps and diagrams in this book use topography based on Ordnance Survey mapping. © NERC 2017. 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Location of the Area 7 model outlined in black, proposed HS2 route shown in red. BGS 1:10,00 scale map sheet areas are shown in black, 1:50,000 scale in blue. ..................... 5 Figure 2. Area 7 project area outlined in green with revised geological fault network shown in red. Faults within the project area are represented in the model .............................................. 8 Figure 3 Plot of revised 1:10,000 scale maps used in the model. Area 7 model area outlined in blue, map sheets shown with red cross-hatching .................................................................... 10 Figure 4. Left: Plot of all boreholes within the Area 7 model area. Coded boreholes with drilled depths of 10 m and over are coloured green, under 10 m in black. Red boreholes are not coded. Right: Plot of boreholes used (red dots) in the 39 cross-sections (blue lines) constructed to constrain the model. Model area outlined in black ......................................... 11 Figure 5. Example of development log text .................................................................................. 12 Figure 6 Modelled distribution of first order river terrace deposits (orange) beneath alluvium (pale yellow). Orange areas indicate where alluvium and first order river terrace deposits are present in the model. Areas of sand and gravel extraction can also be seen. ......................... 13 2 OR/15/073 Figure 7. Extension of GLLMP1-XCZ beneath GFDMP-XSVin the middle of the model area around Coleshill ...................................................................................................................... 14 Figure 8. 3D view of all Area 7 cross sections from the south east (vertical exaggeration x10). Key as Table 1. ....................................................................................................................... 17 Figure 9. 3D view of all superficial deposits in Area 7. Alluvium is coloured yellow, river terrace deposits are pale orange, till is blue, glacial gravels are coloured pink. White areas indicate bedrock at surface. Key as Table 1. ........................................................................................ 18 Figure 10. 3D view of all artificial deposits (grey) in Area 7 with ALV (yellow) and RTD 1 (pale orange). This shows the extent of floodplain sand and gravel workings in the area. Key as Table 1. ................................................................................................................................... 19 Figure 11. 3D view of the modelled Permo-Triassic formations volumes, from the south-west. Vertical exaggeration x10. Key as Table 1............................................................................. 20 Figure 12. 3D ‘exploded’ view of the Carboniferous units in Area 7 from the west (vertical exaggeration x10) ................................................................................................................... 20 Figure 13. 3D ‘exploded’ view of the Cambrian units in Area 7, viewed from the west (vertical exaggeration x10). Key as Table 1. ........................................................................................ 21 TABLES Table 1. Units modelled in Area 7 .................................................................................................. 5 Summary This report describes the 3D geological model of HS2 (High Speed 2 rail link) Area 7 (Hampton in Arden to Drayton Bassett), created by Keith Ambrose with support from Steve Thorpe and borehole