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source: Moainled trom Ulullanl et al. (<014) Dy Gilullanl ana Groat (<U 1). Figure 2. The corundum (Sapphire and Ruby) deposits suitable environments. The alkaline basalt (host for Sapphire and Ruby is comes from mantle source reservoir.

Figure 2 source: Moainled trom Ulullanl et al. (<014) Dy Gilullanl ana Groat (<U 1). Figure 2. The corundum (Sapphire and Ruby) deposits suitable environments. The alkaline basalt (host for Sapphire and Ruby is comes from mantle source reservoir.

Related Figures (9)

Figure 1. Alkali basalt derived from mantle. Corundum (sapphire and ruby) would come form in the range of about 24 to 50 km below the continental surface. Modified from (Levinson and Cook, 1994).
Figure 1. Alkali basalt derived from mantle. Corundum (sapphire and ruby) would come form in the range of about 24 to 50 km below the continental surface. Modified from (Levinson and Cook, 1994).
Figure 3. (A, B) Pits Excavated, (C, D) minerals associated with Sapphire detected by Magnetic pencil.
Figure 3. (A, B) Pits Excavated, (C, D) minerals associated with Sapphire detected by Magnetic pencil.
Source: modified from (A) Merla et al., 1973; (B) Tadesse et al., 1999. Figure 4. (A) Geological map of Ethiopia, (B) Simplified regional geological map of the northern Ethiopia.
Source: modified from (A) Merla et al., 1973; (B) Tadesse et al., 1999. Figure 4. (A) Geological map of Ethiopia, (B) Simplified regional geological map of the northern Ethiopia.
CONCLUSION found as primary magmatic deposit associated with alkaline basalt and as secondary deposits with eluvial, colluvial and alluvial. According (Levinson and Cook, 1994; Simonet et al., 2002) alkali basalts are most host rock for sapphire. The host rock (alkaline basalt) and the associated sapphire mine- ral may have been derived/produced by partial melting from considerable depths (Cox et al., 1979; Le Bas et al., 1986; Levinson and Cook, 1994; Giuliani et al., 2014) (Figures 1 and 2). From field observation and pits excavated the model of the sapphire mineral is shown in figure 9.
CONCLUSION found as primary magmatic deposit associated with alkaline basalt and as secondary deposits with eluvial, colluvial and alluvial. According (Levinson and Cook, 1994; Simonet et al., 2002) alkali basalts are most host rock for sapphire. The host rock (alkaline basalt) and the associated sapphire mine- ral may have been derived/produced by partial melting from considerable depths (Cox et al., 1979; Le Bas et al., 1986; Levinson and Cook, 1994; Giuliani et al., 2014) (Figures 1 and 2). From field observation and pits excavated the model of the sapphire mineral is shown in figure 9.
Table 1. XRF analyses of the host rocks of sapphire in Chilla area.
Table 1. XRF analyses of the host rocks of sapphire in Chilla area.
Source: Le Bas et al., 1986; Cox et al., 1979. Figure 6. SiO2 Wt. % versus total alkali (Naz0+K20 Wt. %) On the diagram.
Source: Le Bas et al., 1986; Cox et al., 1979. Figure 6. SiO2 Wt. % versus total alkali (Naz0+K20 Wt. %) On the diagram.
source: baragal, ly/ 1; Wilyasniro, 19/4; reccerillo and taylor, ly/o. Figure 7. Discrimination diagrams of the high-K calc-alkaline rock series further into low-K tholeiite series.
source: baragal, ly/ 1; Wilyasniro, 19/4; reccerillo and taylor, ly/o. Figure 7. Discrimination diagrams of the high-K calc-alkaline rock series further into low-K tholeiite series.
Figure 8. (A, B) Outcrop of occurrence of sapphire mineral in contact between tertiary volcanics and granitoid; (C, D, E) Sa- pphire mineral from Chilla area. Table 2. Comparison of Chilla Sapphires host rock with other sapphires deposits host rocks.
Figure 8. (A, B) Outcrop of occurrence of sapphire mineral in contact between tertiary volcanics and granitoid; (C, D, E) Sa- pphire mineral from Chilla area. Table 2. Comparison of Chilla Sapphires host rock with other sapphires deposits host rocks.
Figure 9. Schematic cross sectional model of the sapphire deposit at Chilla area from point A to B in figure 5 (0456382mE t 0457824mE and 1584171mN to 1584773mE).
Figure 9. Schematic cross sectional model of the sapphire deposit at Chilla area from point A to B in figure 5 (0456382mE t 0457824mE and 1584171mN to 1584773mE).
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