Dej nyab bas alt yog tsim los ntawm kev tawg lossis kev tawg ntawm cov roob hluav taws lojuas npog qhov dav dav ntawm thaj av lossis dej hiav txwv pem teb nrog ntws ntawm mafic igneous pob zeb (bas alt lava ntws).
Dab tsi ua rau dej nyab bas alts?
Dej nyab Bas alts yog qhov tawg loj heev uas ua rau dej nyab thaj chaw loj ntawm lub ntiaj teb, npog thaj tsam dav nrog thaj chaw tiaj tus lava. Lawv tau hais tias yog qhov tshwm sim ntawm mantle convection los ntawm cov chaw kub, uas tshwm sim tsis sib xws hauv lub sijhawm thiab qhov chaw.
bas alts tsim li cas?
Bas alts yog tsim los ntawm qhov txias sai ntawm bas altic lava, sib npaug rau gabbro-norite magma, los ntawm sab hauv ntawm lub crust thiab nthuav tawm los yog ze rau ntawm lub ntiaj teb. Cov bas alt ntws no yog tuab heev thiab dav, uas cov kab noj hniav yuav luag tsis tuaj.
Yuav ua li cas hom phaj ciam teb feem ntau cuam tshuam nrog dej nyab bas alts?
Associated with convergent (destructive) phaj margins Gabbro Ib coarse grained intrusive igneous pob zeb, zoo ib yam nyob rau hauv muaj pes tsawg leeg rau bas alt, tab sis qhov txias heev maj mam tsim cov muaju loj. Nws yog feem ntau yog txuam nrog loj scale intrusive igneous lub cev (plutons thiab batholiths).
Puas dej nyab bas alts suav tias yog roob hluav taws?
Dej nyab bas alts tseem tsis tau lwm yam txawv ntawm "volcano" Qee qhov hauv ntiaj teb tau npog ntau txhiab square kilometers ntawm tuab bas alt lava ntws - tus neeg ntws yuav ntau dua 50 meters tuab, thiab ib tug neeg ntws mus rau ntau pua kilometers.
