| 11. | Lamprophyre dykes and sheets have intruded at Hibbs Bay and nearby on the south west coast.
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| 12. | Hornblende lamprophyre ( spessarites ) contain plagioclase, coloured light brown and are oriented north-south.
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| 13. | The sapphire bearing Yogo dike is a dark gray to green intrusive rock known as a lamprophyre.
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| 14. | The dikes or sills consist either of phonolite, tinguaite, lamprophyre micromalignite, lamprophyre micromelteigite, or carbonatite.
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| 15. | The dikes or sills consist either of phonolite, tinguaite, lamprophyre micromalignite, lamprophyre micromelteigite, or carbonatite.
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| 16. | Ultrapotassic lamprophyre dikes can also be found along the basin flanks, which are highly unusual in the Rocky Mountain region.
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| 17. | Radiometric dates of 1883-1870 Ma are reported for mafic, ultramafic, carbonatite and lamprophyre intrusions within the Trough.
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| 18. | Volcanic rocks which have been observed include absarokite, andesite, basaltic andesite, hornblende-lamprophyre, minette and spessartite.
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| 19. | Ultrapotassic, ultramafic igneous rocks such as lamprophyre, lamproite and kimberlite are known to have reached the surface of the Earth.
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| 20. | Lamprophyre erratics that originated from the bed of the North Sea demonstrate the influence of ice action on the geomorphology of the islands.
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