Video: Thaum ob daim hlau lithospheric nqa cov pob zeb sab av loj sib tsoo cov txiaj ntsig zoo li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaum ob daim hlau uas nqa continental lithosphere converg cov tshwm sim yog roob roob. Txawm tias ib phaj puas tau khoom hauv qab lwm tus, lub continental crust yog tuab thiab buoyant thiab tsis yooj yim subduct zoo li dej hiav txwv lithosphere.
Ib yam li ntawd ib tug yuav nug, yuav ua li cas tshwm sim thaum ob daim hlau nqa continental crust tsoo?
Qhov tsawg ntom continental crust tsis tuaj yeem tog hauv qab dej hiav txwv ntau dua pob zeb . Hloov chaw, subduction tshwm sim raws li dej hiav txwv phaj dab dej hauv qab continental phaj . Thaum twg ob daim hlau nqa continental crust tsoo , subduction tsis coj qhov chaw. Es tsis txhob, kev sib tsoo squeezes lub pob zeb mus rau hauv tej roob muaj zog.
Ib yam li ntawd, yuav ua li cas thaum lub phaj tau txais subducted? Ob tug tectonic daim hlau thiab lithosphere koom nrog a subduction ib cheeb tsam yuav yog dej hiav txwv, los yog ib qho yog dej hiav txwv thiab lwm yam continental. Lub mantle hauv qab lithosphere yog kub, dej pob zeb. Thaum ib phaj sinks rau hauv nws thaum lub sij hawm subduction , nws melts rau hauv lub mantle.
Cov lus nug tseem yog, yuav ua li cas tom qab kev sib tsoo ntawm ob sab av loj?
Cov kev sib tsoo ntawm ob sab av loj daim hlau tshwm sim thaum ib lub hiav txwv yuav nqaim mus txog rau thaum ob leeg daim hlau sib tsoo . Tom qab kev sib tsoo dej hiav txwv lithosphere tawg tawm thiab tso rau hauv lub mantle. Lub subduction cheeb tsam nws thiaj li ua inactive Lub ob sab av loj ua welded ua ke raws li lawv tau compressed ua ke dhau sijhawm.
Dab tsi yog 2 hom crust pom ntawm lub ntiaj teb nto?
Lub Ntiaj Teb Crust Muaj ob hom crust: nyias dej hiav txwv crust uas underlies lub hiav txwv basins, thiab thicker continental crust uas underlies lub continents. Ob hom crust no yog tsim los ntawm ntau hom pob zeb.
Pom zoo:
Yuav ua li cas tshwm sim thaum daim hlau sib tsoo thiab diverge?
Divergent (Spreading): Qhov no yog qhov uas ob daim hlau txav deb ntawm ib leeg. Convergent (Colliding): Qhov no tshwm sim thaum daim hlau txav ntawm ib leeg thiab sib tsoo. Thaum lub phaj continental ntsib ib lub phaj dej hiav txwv, lub thinner, denser, thiab hloov tau yooj yim dua dej hiav txwv phaj dab dej hauv qab cov phaj tuab, nruj dua
Koj tuaj yeem ua pov thawj li cas 2 daim duab peb sab zoo sib xws siv lub kaum sab xis sab SAS zoo sib xws postulate?
SAS Similarity Theorem hais tias yog ob sab hauv ib daim duab peb sab yog proportional rau ob sab hauv lwm daim duab peb sab thiab lub kaum sab xis nyob rau hauv ob qho tib si congruent, ces ob daim duab peb sab zoo ib yam. Ib qho kev hloov pauv zoo sib xws yog ib lossis ntau qhov kev hloov pauv tsis tu ncua ua raws li kev dilation
Nws hu li cas thaum daim hlau tectonic sib tsoo?
Yog tias ob daim hlau tectonic sib tsoo, lawv tsim ib thaj tsam ntawm cov phaj sib txuas. Feem ntau, ib qho ntawm cov hlau sib txuas yuav txav mus rau hauv qab ntawm lwm qhov, ib qho txheej txheem hu ua subduction. Thaum ob daim phiaj txav deb ntawm ib leeg, peb hu qhov no yog ib thaj tsam sib txawv
Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
Cov kaum sab hauv yog hu ua Sab hauv cov ces kaum. Cov lej ntawm cov kaum sab hauv ntawm daim duab peb sab yog ib txwm 180 degrees. Lub kaum sab nrauv yog lub kaum sab xis ntawm ib sab ntawm ib qho duab, thiab ib txoj kab txuas ntxiv los ntawm sab tom ntej. Qhov sib npaug ntawm lub kaum sab nrauv thiab nws lub kaum sab hauv uas nyob ib sab kuj yog 180 degrees
Cov pob zeb hauv av twg tuaj yeem tsim cov pob zeb zoo li lub raum?
Hematite (los yog haematite) Kuj tseem muaj ntau hom hematite, qee yam yog: raum ore, ib qho loj, botryoidal (lumpy) lossis reniform (lub raum zoo li tus) daim ntawv; specularite, micaceous (flaky) daim ntawv; oolitic, ib daim ntawv sedimentary tsim los ntawm cov nplej me me; liab ochre, ib daim ntawv liab earthy