2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Feem ntau txuam nrog unsieved volcanic kev ua si-xws li Plinian los yog krakatoan eruption styles, los yog phreatomagmatic eruptions- pyroclastic deposits yog feem ntau tsim los ntawm huab cua tshauv, lapilli thiab foob pob los yog blocks ejected los ntawm lub roob hluav taws nws tus kheej, tov nrog tawg lub teb chaws pob zeb.
Tsuas yog li ntawd, cov khoom siv pyroclastic yog dab tsi?
Pyroclastic khoom yog lwm lub npe rau huab ntawm tshauv, lava fragments nqa los ntawm huab cua, thiab vapor. Xws li ib ntws feem ntau yog * heev * kub, thiab txav * nrawm * vim buoyancy muab los ntawm cov vapors. Pyroclastic ntws tuaj yeem ncua mais ntawm lub roob hluav taws, thiab ua rau lub neej thiab cov khoom puas tsuaj hauv lawv txoj kev.
Tom qab ntawd, lo lus nug yog, dab tsi yog 4 hom pyroclastic khoom? Cov ntsiab lus hauv cov teeb no (4)
- volcanic foob pob. loj foob pob ntawm magma uas tawv nyob rau hauv cov huab cua.
- Lapili. txhais tau tias "me me pob zeb" hauv Italian.
- volcanic tshauv. Cov ntaub ntawv thaum cov pa roj hauv cov tawv magma nthuav dav sai thiab cov phab ntsa ntawm cov pa roj npuas tawg mus rau hauv me me, iav zoo li nyiaj.
- volcanic blocks.
Kuj paub, pyroclastic flow tsim li cas?
Lawv tuaj yeem yog tsim los ntawm lub cev qhuav dej ntawm cov ntaub ntawv ntom ntom nyob rau hauv lub nce eruption kab los yog ncaj qha los ntawm lub volcanic vent. Pyroclastic ntws suav nrog vesicle-nplua nuj pumice ntws thiab dense block-and-ash ntws tsim los ntawm gravitational collapse ntawm loj hlob lava domes thiab active lava- ntws pem hauv ntej.
Cov volcanoes twg yog tsim los ntawm pyroclastic deposits?
Composite los yog Stratovolcanoes (Fig. 5.14) erupted ob leeg lava thiab pyroclastic deposits. Yog li ntawd, cov slopes ntawm stratovolcanoes yog tsim los ntawm lava ntws alternating nrog txheej ntawm pyroclastic deposits. Stratovolcanoes muaj qhov chaw siab tshaj tshaj qhov thaiv hluav taws xob thiab muaj ntau nyob rau hauv cov kab sib txuas sib txuas (Fig.
Pom zoo:
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