Study of Rock Blasting Failure Pattern with One Free Boundary
Mineral features according to polarizing microscope images.
|Potassium feldspar (Kfs)||It is semi‐idiomorphic, columnar, and argillaceous; it mainly consists of a strip of orthoclase and a stripe of feldspar; and it has a two-long structure with potassium feldspar.|
|Plagioclase (Pl)||It is semi‐idiomorphic, columnar, and polycrystalline and undergo sericitization and zoisite fossilization; it has a two-long structure with plagioclase.|
|Quartz (Qtz)||It is xenomorphic-granular. The main grain size is 2–5 mm; some grain size is 0.5–2 mm, and the content is about 20%.|
|Biotite (Bt)||It is idiomorphic schistose, brown, chloritization in varying degrees; it shows metasomatic residual or pseudomorphic structure. The main grain size is 0.2–2 mm, and the content is about 7%.|
|Amphibole (Hbl)||It is semi-idiomorphic and columnar. The main grain size is 0.5–2 mm, and the content is about 2%.|
|Others||The auxiliary minerals are magnetite, zircon (Zrn), and apatite (Spn). The altered minerals are sericite, tetrahedrite, and chlorite.|