Ophiolite yog dab tsi thiab vim li cas lawv tseem ceeb?
Ophiolite yog dab tsi thiab vim li cas lawv tseem ceeb?

Video: Ophiolite yog dab tsi thiab vim li cas lawv tseem ceeb?

Video: Ophiolite yog dab tsi thiab vim li cas lawv tseem ceeb?
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Anonim

Txij li cov kws tshawb fawb yeej tsis tau tho qhov tob txaus rau hauv lub ntiaj teb los soj ntsuam lub mantle, ophiolites yog tseem ceeb vim lawv yog qhov chaw uas geologists tuaj yeem soj ntsuam cov ntu loj ntawm mantle pob zeb ncaj qha.

Ib yam li ntawd ib tug yuav nug, ua li cas yog ib qho ophiolite tsim?

tsim . … ultramafic pob zeb yog hu ua ophiolites . Ntau tus geologists ntseeg qhov ntawd ophiolites tsim nyob rau hauv dej hiav txwv ridges tau emplaced los ntawm tectonic rog ntawm convergent phaj ciam teb thiab tom qab ntawd tau tshwm sim nyob rau hauv heev deformed orogenic (roob) txoj siv sia.

Kuj Paub, hom pob zeb ua li cas los ntawm ophiolite? Ophiolite yog stratified igneous pob zeb complex tsim los ntawm sab sauv basalt tus tswv cuab, nruab nrab gabbro cov tswv cuab thiab cov tswv cuab hauv qis peridotite (Fig. 1). Qee qhov loj loj ntsuas ntau tshaj 10 km tuab, 100 km dav thiab 500 km ntev. Lub sij hawm " opiolite " txhais tau tias "nab pob zeb" hauv Greek.

Tsis tas li ntawd, qhov twg ophiolite sequences tsim niaj hnub no?

Ophiolites tau pom hauv Cyprus, New Guinea, Newfoundland, California, thiab Oman. Lub Samail opiolite nyob rau sab hnub tuaj Oman tej zaum tau kawm nyob rau hauv qhov nthuav dav tshaj plaws. Tej zaum pob zeb tsim nyob rau hauv Cretaceous tsis deb ntawm dab tsi yog tam sim no lub Persian Gulf.

Dab tsi yog ib qho Ophiolite suite?

-līt', ō'fē-] Ib ntu ntawm pob zeb uas muaj cov dej hiav txwv sib sib zog nqus dej hiav txwv overlying (los saum toj mus rau hauv qab) hauv ncoo basalts, sheeted dikes, gabbro, dunite, thiab peridotite.

Pom zoo: