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Photomicrographs showing hydrothermal alteration minerals at the Shwebontha prospect. (Qz-quartz, Ill-illite, Sme-smectite, Chl-Chlorite, Epi-Epidote, Py-Pyrite, Plg-Plagioclase, Lf-Lithic fragment).
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The Shwebontha prospect area is situated in the Central Volcanic Belt, central Myanmar, where the well-known Sagaing Fault serves as its eastern boundary. This study aims to document key the mineralogy, host rock geochemistry and ore mineralizing fluids. The mineralization, hosted by Upper Oligocene to Middle Miocene rhyolites, displays a strong li...
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... the research area, three principal kinds of hydrothermal alteration zones have evolved including silicic, argillic and propylitic alteration types. They are examined by optical petrographic observations (Figure 7). ...
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... is also a common type of hydrothermal alteration in the Shwebontha propsect, and is closely related to ore mineralization. Silicified rock is characterized by equigranular microcrystalline quartz, hematite and sulfide minerals (Figure 7). This alteration is represented by chalcedony, disseminated pyrite with medium to coarse-grained quartz and quartz veinlets in the brecciated sulfide quartz vein and chalcedonic quartz vein (Figure 7). ...
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... rock is characterized by equigranular microcrystalline quartz, hematite and sulfide minerals (Figure 7). This alteration is represented by chalcedony, disseminated pyrite with medium to coarse-grained quartz and quartz veinlets in the brecciated sulfide quartz vein and chalcedonic quartz vein (Figure 7). And, it also occurs as mineralized veins and is associated with breccias blocks of cement, vein-veinlet and stockwork (up to 2-3 cm width) quartz veins ( Figure 7). ...
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... alteration is represented by chalcedony, disseminated pyrite with medium to coarse-grained quartz and quartz veinlets in the brecciated sulfide quartz vein and chalcedonic quartz vein (Figure 7). And, it also occurs as mineralized veins and is associated with breccias blocks of cement, vein-veinlet and stockwork (up to 2-3 cm width) quartz veins ( Figure 7). Argillic alteration is characterized by a variable amount of quartz, plagioclase, opaque minerals and clay minerals (sericite, illite, illite/smeciite, and kaolinite). ...
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... alteration is characterized by a variable amount of quartz, plagioclase, opaque minerals and clay minerals (sericite, illite, illite/smeciite, and kaolinite). Anhedral to subhedral quartz is found as a phenocryst and fine-grained groundmass ( Figure 7). Opaque minerals (pyrite) have occurred dissemination (Figure 7) which is associated with clay minerals (illite, smectite and quartz). ...
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... to subhedral quartz is found as a phenocryst and fine-grained groundmass ( Figure 7). Opaque minerals (pyrite) have occurred dissemination (Figure 7) which is associated with clay minerals (illite, smectite and quartz). Altered plagioclase was replaced by the yellowish-brown colour of sericite and kaolinite (Figure 7). ...
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... minerals (pyrite) have occurred dissemination (Figure 7) which is associated with clay minerals (illite, smectite and quartz). Altered plagioclase was replaced by the yellowish-brown colour of sericite and kaolinite (Figure 7). In addition, plagioclase phenocrysts and groundmass were partially replaced by illite, illite/smectite mixed layer mineral, pyrite and quartz minerals. ...
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... addition, plagioclase phenocrysts and groundmass were partially replaced by illite, illite/smectite mixed layer mineral, pyrite and quartz minerals. Secondary quartz mainly replaced the groundmass or matrix of the rhyolites (Figure 7). According to the microscopic study, the common propylitic alteration minerals are quartz, chlorite, epidote and pyrite (Figure 7). ...
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... quartz mainly replaced the groundmass or matrix of the rhyolites (Figure 7). According to the microscopic study, the common propylitic alteration minerals are quartz, chlorite, epidote and pyrite (Figure 7). The presence of chlorite and epidote can be recorded in the alteration type as propylitic alteration. ...
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... presence of chlorite and epidote can be recorded in the alteration type as propylitic alteration. Altered plagioclase was replaced by quartz, chlorite, epidote, and some clay minerals (Figure 7). Figure [15] , (b) Nb/Y vs Zr/TiO 2 plot of volcanic rocks from the Shwebontha prospect [16] . ...
