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mInerAloGy of the GeothermAl system In neVIs Faults and fractures are the primary source of permeability in crystalline rocks, however, many active hydrothermal systems exhibit active precipitation of minerals and chemical alteration, which then dictates that fracturing of conducting fluids in the subsurface will often seal and permeability will be lost. In contrast, recurrent brittle fractures and frictional failure in low porosity crystalline rocks produce dilation owing to surface roughness along the fracture wall (Brown, 1987) and the formation of breccias and micro-cracks during fault slip (Lockner and Beeler, 2002). Figure 3 illustrates the ages of eruptions and the mineralogy of Nevis which is rather diverse. At Round Hill which is located in the northwest region of the island is concentrated with hornblende-pyroxene and phyric dacite. At Hurricane Hill, Cades Bay, Saddle Hill Red Cliff, Butler’s Mountain, and Nevis Peak there are pyroxene-phyric dacite, porphyritic dacite, volcanic breccias, porphyritic and orthopyroxene- phyric dacite respectively (Hutton and Nockolds, 1978). GeoloGy of neVIs Radiometric age dating of the almost exclusively volcanic rock of the island of Nevis shows a history of island-forming eruptions that initiated 3.4 million years ago, whilst the youngest only 0.1 million years before present. Pyroclastic rocks with a dacite composition is the dominant rock type hence hinting the presence of a high-level, evolved magmatic center of the type that maintains high heat flux in the near- surface. One interesting feature is that of a sector collapse, which can be shown by topography in the western portion of the island (Figure 4). The apparent sector collapse extends within the range of the northern boundary of the Spring Hill Fault Zone and the southern boundary of Grandee Ghut Fault. Figure 4. Sector collapse on the western portion of Nevis. Figure 3. Ages of eruptions. Mineralogy of Nevis (Hutton and Nockholds, 1978). 24 GHC BULLETIN, AUGUST 2012PDF Image | Geothermal Prospecting for Nevis and Montserrat
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