| 1. | This is especially critical for komatiite lavas and ultramafic intrusive rocks.
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| 2. | Igneous intrusive rocks are generally not divided into formations.
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| 3. | The intrusive rocks ( late Precambrian ) are in part covered by sand.
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| 4. | The mineralogy changes with distance from the intrusive rock.
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| 5. | Granodiorite, tonalite and diorite are most common intrusive rocks found in continental arcs.
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| 6. | Magmatic fluids coming from the intrusive rock may also take part in the metamorphic reactions.
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| 7. | Intrusive rocks formed at greater depths are called plutonic or " abyssal ".
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| 8. | The intrusive rocks of the area are composed of three types : ring intrusions and central plutons.
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| 9. | The quartz-porphyries are distinguished from the rhyolites by being either intrusive rocks or Palaeozoic lavas.
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| 10. | Alignment of tabular minerals in metamorphic rocks, igneous rocks and intrusive rocks may form a foliation.
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