FORMASIYa

FORMASIYa (az lotini Formatio — tashakkul, paydoish), formasiyai geologi, geoformasiya, geogenerasiya, majmui tabiii jinshoi kuhi, mineralho va madanhora guyand, ki az jihati paragenetiki bo hamdigar zich aloqamand buda, az rui sinn va sharoiti geologii paydoish ba yakdigar tamoman nazdikand. Mafhumi «formasiya» dar asri 18 baroi ifoda namudani tabaqahoi gafsi jinshoi tahshini ba vujud omadaast. Formasiyai magmavi tarokumi jinshoi kuhii magmavist, ki dar sharoitya muayyani geologi paydo shuda, marhalahoi judogonai taraqqiyoti in yo on qitai qishri Zaminro dar bar megirad. Formasiyai metamorfi dar asosi prinsipi umumiyati paydoishi jinshoi kuhii metamorfi, ki bo strukturahoi muayyani tektoniki aloqamandand, judo karda meshavad. Formasiyai metasomati (masalan, formasiyahoi skarni, greyzeni, albiti) chandon inkishof nayoftaast. Formasiyai madan bo formasiyai magmavi va metasomati zich aloqamand buda, bo onho dar yak jo vomekhurad. Masalan, formasiyai madani khromit, pirrotin-khalkopirit-pentlandit va gayra bisyor mamuland.