Trachyte feem ntau cuam tshuam nrog lwm cov lavas hauv thaj av volcanic thiab xav tias tau tsim los ntawm cov crystallization thiab abstraction ntawm hlau, magnesium, thiab calcium minerals los ntawm niam txiv bas altic lava. Ob hom trachyte feem ntau lees paub.
Trachytes thiab Syenites cuam tshuam li cas thiab lawv feem ntau ua los ntawm dab tsi?
Synites thiab Trachytes. Syenites, thiab lawv cov extrusive sib npaug trachytes, yog pob zeb nplua nuj nyob rau hauv alkali feldspar, nrog cov keeb kwm uas qhia txog keeb kwm los ntawm fractional crystallization. Lawv lub ntsiab mafic minerals yog Fe-nplua nuj olivine (fayalite, Fa) thiab clinopyroxene.
Koj tuaj yeem ntes Trachytes li cas?
Xim: sib txawv tab sis feem ntau lub teeb xim, feem ntau lub teeb xim phenocrystsKev ntxhib los mos: Feem ntau porphyritic (yuav ua tau trachytic), qee zaum aphanitic. Cov ntsiab lus ntxhia: Orthoclase phenocrysts hauv av loj ntawm orthoclase nrog me plagioclase, biotite, hornblende, augite thiab lwm yam.
Puas yog trachyte nruab nrab?
Trachyte yog pob zeb extrusive, belongs rau alkali series ntawm intermediate volcanic pob zeb.
Dab tsi ua rau Trachytic kev ntxhib los mos?
Trachytic yog ib qho kev ntxhib los mos ntawm cov pob zeb extrusive nyob rau hauv uas lub hauv paus av muaj me ntsis volcanic iav thiab muaj feem ntau ntawm feeb tabular crystals, uas yog, sanidine microlites. … Trachytic kev ntxhib los mos tshwm sim hauv pob zeb uas nplua nuj nyob hauv alkalies; yog li cov vitreous loj ntawm cov pob zeb muaj qhov viscosity tsawg.
