Tholeiitic basalt txawv li cas ntawm pob zeb volcanic feem ntau?
Tholeiitic basalt txawv li cas ntawm pob zeb volcanic feem ntau?

Video: Tholeiitic basalt txawv li cas ntawm pob zeb volcanic feem ntau?

Video: Tholeiitic basalt txawv li cas ntawm pob zeb volcanic feem ntau?
Video: Mantle geochemistry sees plumes, doesn’t it? OIB + Continental LIP’s - James H Natland 2024, Hlis ntuj nqeg
Anonim

Pob zeb hauv tholeiitic magma series yog cais raws li subalkaline (lawv muaj sodium tsawg dua li lwm yam basalts ) thiab yog txawv ntawm pob zeb Nyob rau hauv lub calc-alkaline magma series los ntawm redox lub xeev ntawm magma lawv crystallized los ntawm ( tholeiitic magmas yog txo; calc-alkaline magmas yog oxidized).

Ib yam li ntawd, koj tuaj yeem nug, tholeiitic txhais li cas?

-īt '] Ib qho ntawm cov pob zeb tsis zoo uas zoo sib xws rau cov basalt, tab sis yog nplua nuj nyob hauv silica thiab hlau thiab pluag hauv txhuas dua li basalt. Tholeiites tsim tshwj xeeb tshaj yog nyob rau hauv nruab nrab ntug dej hiav txwv ridges thiab nyob rau hauv continental rift cheeb tsam.

Dab tsi tshwm sim rau basalt dhau sijhawm? Lava txias sai heev vim qhov saum npoo ntawm lub ntiaj teb txias. Qhov no txhais tau hais tias igneous pob zeb tsim los ntawm txias lava, xws li basalt , tsuas muaj sij hawm kom loj hlob me me muaju. Feem ntau cov npuas roj tuaj yeem nkag rau hauv cov pob zeb no thiab. Thaum no tshwm sim , igneous pob zeb tsim muaju thiab hais tias crystallise.

Ib yam li ntawd, alkaline pob zeb yog dab tsi?

Alkaline pob zeb , ib yam ntawm ntau yam pob zeb Nyob rau hauv uas cov tshuaj cov ntsiab lus ntawm alkalies (potassium oxide thiab sodium oxide) zoo txaus rau alkaline minerals los tsim. Cov zaub mov zoo li no tej zaum yuav txawv txawv sodium nplua nuj, nrog qhov sib piv ntawm alkalies rau silica (SiO.2), raws li nyob rau hauv feldspathoids.

Vim li cas cov pob zeb basaltic tshwm sim ntawm nruab nrab ntug dej hiav txwv ridges thiab ntawm qhov chaw kub hauv dej hiav txwv chaw teeb tsa?

Basalts ntawm Dej hiav txwv Divergent Boundaries Feem ntau ntawm Lub Ntiaj Teb basalt yog ua nyob rau hauv divergent phaj ciam teb ntawm lub nruab nrab - ntug dej hiav txwv system (saib daim ntawv qhia). Ntawm no convection tam sim no xa pob zeb kub los ntawm tob hauv lub mantle. Qhov no pob zeb kub melts raws li lub divergent ciam rub sib nrug, thiab lub molten pob zeb tawg mus rau hauv hiav txwv pem teb.

Pom zoo: