1. Deformational events are often also associated with volcanism and igneous activity . 2. Zonation patterns associated with igneous activity are usually easy to interpret. 3. The Waziristan hills were subject to igneous activity during the late Cretaceous period. 4. Laccolith formations are caused by igneous activity otherwise known as melting within the earth. 5. Igneous activity associated with this stretching occurred from 12 million to 4 million years ago.6. The igneous suite marks the last phase of igneous activity of Precambrian age in the Indian subcontinent. 7. Hydration of minerals occurs generally in concert with hydrothermal circulation which may be driven by tectonic or igneous activity . 8. During the early part of the era, considerable igneous activity took place in neighboring states to the east. 9. Many of the grabens have prominent signs of igneous activity , with diabase intrusions and basalt flows being quite common. 10. Igneous activity continued throughout the Cenozoic but was particularly more active in the northern region of Borneo in the Neogene.
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