41. Tungsten ore deposits are predominantly magmatic or hydrothermal in origin and are associated with felsic igneous intrusions. 42. Xenoliths that originated in the Earth's crust include rich metamorphic rocks and felsic intrusive rocks. 43. The felsic footwall is subject to a pronounced stretching lineation which increases in intensity to the north. 44. This is interpreted to occur due to competency contrast between the felsic footwall and the ultramafic unit. 45. The slopes of the peak are highly unstable, consisting of weak, hydrothermally altered felsic rocks. 46. Gold is associated with silicic, kaolinitic, and pyritic alteration of greenschist-grade felsic metavolcanics. 47. The largest of the less common felsic lava flows is located between Link Lake and Turtle Lake. 48. Mafic melts contain low levels of dissolved gases whereas felsic melts contain high levels of dissolved gases. 49. The ages of these felsic rocks are generally between 2.5 and 3.8 billion years. 50. Felsic and mafic rocks tend to be less affected by carbon dioxide due to their higher aluminium content.
