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NGU Report 2011.034 NGU Report 2011.034 Geological investigations by drill core logging for the Rogfast tunnel project. Geological Survey of Norway NO-7441 Trondheim, Norway Tel.: 47 73 90 40 00 Telefax 47 73 92 16 20 REPORT Report no.: 2011.034 ISSN 0800-3416 Grading: Open Title: Geological investigations by drill core logging for the Rogfast tunnel project Authors: Client: Aline Saintot & Arne Solli Statens Vegvesen, Region Vest / NGU County: Commune: Rogaland Randaberg, Kvitsøy Map-sheet name (M=1:250.000) Map-sheet no. and -name (M=1:50.000) Haugesund 1213 III Rennesøy, 1113 II Skudeneshavn Deposit name and grid-reference: Number of pages: 71 pp. Price (NOK): NOK 250 Alstein, UTM 32V 300588E 6549227N Map enclosures: Sauholmen, UTM 32V 294861E 6553957N Krågøy, UTM 32V 295884E 6552356N Hesteholmen UTM 32V 295633E 6551992N Fieldwork carried out: Date of report: Project no.: Person responsible: March and September 20-12-2011 341500 2011 Summary: In the framework of Rogfast undersea tunnel project, the Norwegian road authorities, western region, have cored four locations along the tunnel trace. The report contains the results of the geological logging of several of these cores from drilling at four locations. The first core comes from Alstein, an island between Randaberg and Kvitsøy, and displays the typical intrusive mainly gabbroic rocks of the Karmøy Ophiolite unit. A shear zone at the bottom of the core may indicate the vicinity of the sole detachment of the Hardangerfjord Nappe. The three other cores are from Kvitsøy. They display the typical meta- volcanic and volcano-clastic greenstones outcropping on the island but also a large proportion of graphite-rich black shales which was not previously reported in the bedrock suite. The inspection of the cores drilled northward from Sauholmen, an island north of Kvitsøy, confirms the presence of a tectonic fault zone along the Boknafjord. The other cores were drilled toward the east from Krågøy and Hesteholmen, two islands east of Kvitsøy. Along these cores, quartz-rich units and cherty schists are widely present and interlayered with the black shales and greenstones. The cores show an impressive amount of large fault rock intervals and damaged host rocks toward the expected location of steep regional meridian fault zones. Keywords: Bedrock geology Structural geology Drill core logging Scientific report CONTENTS 1. INTRODUCTION .............................................................................................................. 6 2. GEOLOGICAL LOGGING OF ALSTEIN DRILL CORE ............................................... 8 2.1 Geological logging of Alstein drill core ...................................................................... 8 2.2 General remarks on Alstein drill core inspection ........................................................ 9 2.3 Geophysical and geological profile along Alstein drill hole ..................................... 10 3. GEOLOGICAL LOGGING OF SAUHOLMEN DRILL CORES ................................... 11 3.1 Geological logging of Sauholmen Bh01.10 drill core ............................................... 11 3.2 Geological logging of Sauholmen Bh01.10B drill core ............................................ 11 3.3 General remarks on Sauholmen Bh01.10 and Bh01.10B drill cores ......................... 13 3.4 Geological profiles along Sauholmen drill holes ...................................................... 13 3.5 NGU sampling of black shales along Sauholmen Bh01.10B drill core .................... 15 4. GEOLOGICAL LOGGING OF KRÅGØY DRILL CORES ........................................... 16 4.1 Geological logging of Krågøy Hull1 drill core ......................................................... 16 4.2 Geological logging of Krågøy Bh01.11 drill core ..................................................... 16 4.3 Geological logging of Krågøy Bh01.11C drill core .................................................. 17 4.4 General remarks on Krågøy Hull1, Bh01.11 and Bh01.11C drill cores. ................... 17 4.5 Geological profile along Krågøy drill holes .............................................................. 19 5. GEOLOGICAL LOGGING OF HESTEHOLMEN DRILL CORES .............................. 20 5.1 Geological logging of Hesteholmen Bh02.11A drill core ......................................... 20 5.2 Geological logging of Hesteholmen Bh02.11B drill core ......................................... 21 5.3 General remarks on Hesteholmen Bh02.11A and Bh02.11B drill cores ................... 22 5.4 Geological profile along Hesteholmen drill holes ..................................................... 23 6. DISCUSSION AND REVISED GEOLOGICAL MODELS ........................................... 24 6.1 Geological model between Randaberg and Kvitsøy .................................................. 24 6.2 Geological model between Kvitsøy and Vestre Bokn ............................................... 26 7. CONCLUSION ................................................................................................................. 30 8. REFERENCES ................................................................................................................. 33 FIGURES Figure 1. Tectonic map of the Rogfast tunnel region from Rønning et al. (2006) with locations of the four analysed Alstein, Sauholmen, Krågøy and Hesteholmen drill cores. .............. 7 Figure 2: Detailed overview of drill holes investigated next to Kvitsøy. .................................. 7 Figure 3. Sheared granitic layer, mylonitic texture, and porphyroblasts of K-feldspars in the 274.3 – 283 m core interval. ............................................................................................... 9 Figure 4. Geophysical and geological log of the Alstein drill hole. (From Elvebakk 2011). .. 10 Figure 5. Approximately 1 m of breccia, i.e. crushed graphite (silty to sandy grain size; top picture) with brecciated quartz (bottom picture) at 678.5 m within the black shales. This section of the hole collapsed and the drilling was aborted, due to poor rock quality. ..... 12 Figure 6. Silty to sandy grain size breccias in the graphite-rich black shale layer of the 665.8 – 668 m core interval. .......................................................................................................... 12 Figure 7. Geological logs along the profiles of the drill holes of Sauholmen: Bh01.10 (top) and Bh01.10B (bottom). H, elevation relative to 0 m altitude; HD, horizontal distance from the point of drilling at the topographic surface. The thicknesses of brittle crushed zones/breccias and ductile shear zones are exaggerated along the profile for a better visualization. .................................................................................................................... 14 Figure 8. Sauholmen 1 NGU sample. Top picture: before sampling; bottom picture: after sampling. .......................................................................................................................... 15 Figure 9. Sauholmen 2 NGU sample. Left picture: before sampling; right picture: after sampling. .......................................................................................................................... 15 Figure 10. Sauholmen 3 NGU sample. Top picture: before sampling; bottom picture: after sampling. .......................................................................................................................... 15 Figure 11. Picture of a clay-rich, silty to sandy grain size crushed zone, i.e. gouge-bearing breccias, of the 297 – 308 m interval (here, box of the 297.6 – 305 m core interval with top of drill core to the left). .............................................................................................. 17 Figure 12. Picture of the 263.7 – 294.5 m core interval with the large fine-grained clay-rich crushed zone/fault gouge-bearing breccia, typical of the 275– 295 m core interval. ...... 18 Figure 13. Geological logs along the profiles of the drill holes of Krågøy. ............................. 19 Figure 14. Fault gouge/clay-rich silty to sandy grain size crushed zone/breccias with angular quartz fragments of the 416 – 425.3 m core interval (with, here, 424 m at the top left of the picture). ....................................................................................................................... 21 Figure 15. A picture to illustrate the severely crushed clay-rich zone, i.e. fault gouges and breccias of the 417.5 – 426 m core interval. .................................................................... 22 Figure 16. Geological logs along the profiles of the drill holes of Hesteholmen: Bh02.11A (top) and Bh02.11B (bottom). .......................................................................................... 23 Figure 17. Possible geological sections Randaberg – Kvitsøy (modified from Rønning et al. 2006) with a zoom in on the Alstein area. Both proposed profiles show the truncation of the folds in the Hardangerfjord Nappe by its sole detachment. The faults east of Kvitsøy have unknown sense of shear and amount of offset. ........................................................ 26 Figure 18. Map of northern Kvitsøy with the projection of the shallow NNE-dipping bore hole of Sauholmen. The fault and crushed zones may correspond to the reported lineaments and magnetic linear dislocations in Rønning et al. (2006). The geology is from Ragnhildstveit et al. (1998). ............................................................................................
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