Dziko lachisanu ndi chitatu .. Zealandia ndi dziko lowopsya ndi zinsinsi kwa nthawi yoyamba

Pakuya pafupifupi mamita 3500 (mamita 1066) pansi pa mafunde a South Pacific pali kontinenti yachisanu ndi chitatu yomwe inatayika, dziko lalikulu lomira, lotchedwa Zealandia, lomwe asayansi adatsimikizira ngati kontinenti mu 2017, koma sanathe kujambula. mapu akuwonetsa kufalikira kwake. .

Zealandia ili pansi pa madzi a Pacific Ocean, kum’mwera chakumadzulo, ndipo zikuoneka kuti New Zealand wamakono anali mbali yake chabe.

"Tidapanga mamapuwa kuti apereke chithunzi cholondola, chokwanira, komanso chaposachedwa kwambiri cha geology ya New Zealand ndi Southwest Pacific - kuposa momwe tinaliri kale," adatero Nick Mortimer, yemwe adatsogolera gululi.

Kodi zodabwitsa zisanu ndi ziwiri zapadziko lapansi zomwe zidasangalatsa dziko lapansi ndi ziti?

Mortimer et al.'s bathymetric mapu ozungulira Zealandia, mawonekedwe ndi kuya kwa pansi pa nyanja, kuwonjezera pa deta yake ya tectonic, inavumbulutsa malo enieni a Zealandia, kudutsa malire a tectonic plate.

Mamapu adawululanso zatsopano za momwe Zealandia, yomwe idamira zaka mamiliyoni ambiri zapitazo, idapangidwa.

Malinga ndi zatsopanozi, Zealandia ili ndi dera la pafupifupi 5 miliyoni masikweya kilomita (XNUMX miliyoni masikweya kilomita), pafupifupi theka la kukula kwa kontinenti yapafupi ya Australia.

Kuti mudziwe zambiri za kontinenti yomwe ili pansi pamadzi, Mortimer ndi gulu lake adapanga mapu a Zealandia ndi pansi pa nyanja mozungulira. Mapu a bathymetric omwe adapanga akuwonetsa momwe mapiri ndi zitunda za kontinentiyi zilili pamwamba pamadzi.

Mapu akuwonetsanso madera a m'mphepete mwa nyanja, ndi mayina azinthu zazikulu zapansi pa nyanja. Mapu ndi gawo la padziko lonse lapansi Kupanga mapu a pansi pa nyanja yonse pofika 2030.

Amakhulupirira kuti Zealandia adasiyana ndi Australia pafupifupi zaka 80 miliyoni zapitazo, ndipo adamira pansi pa nyanja ndikugawanika kwa dziko lapansi lomwe limadziwika kuti Gondwana Land.

Mortimer anali atafotokoza kale kuti akatswiri a sayansi ya nthaka anapeza, kumayambiriro kwa zaka za zana lapitalo, zidutswa za granite zochokera kuzilumba za pafupi ndi New Zealand, ndi miyala ya metamorphic ku New Caledonia yosonyeza geology ya kontinenti.