Современные проблемы геологии

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Современные проблемы геологии Лекция Б2 Глобальная тектоника

Геотектоника

Возможные будущие суперконтиненты Список суперконтинентов Древние суперконтиненты Гондвана (~600 — 30 миллионов лет назад) Лавразия (~300 — 60 миллионов лет назад) Пангея (~300 — 180 миллионов лет назад) Лавруссия (~300 миллионов лет назад) Паннотия (~600 — 540 миллионов лет назад) Родиния (~1.1 миллиард лет назад — ~750 миллионов лет назад) Коламбия, также известен как Нуна, (~1.8 — 1.5 миллиарда лет назад) Нена (~1.8 миллиарда лет назад) Кенорланд (~2.7 миллиарда лет назад) Neoarchean sanukitoid cratons and new continental crust formed Kenorland. Protracted tectonic magna plume rifting occurred 2.48 to 2.45 Ga and this contributed to the Paleoproterozoic glacial events in 2.45 to 2.22 Ga. Final breakup occurred ~2.1 Ga.) Ур (~3 миллиарда лет назад) en:Komatii Formation (3.475 миллиарда лет назад) Ваальбара (~3.6 миллиарда лет назад) en:Yilgarn (Zircon crystals from the Jack Hills of the Narryer Gneiss Terrane, Yilgarn craton, Western Australia and also 300 km. south point to a continental crust formation between 4.4-4.3 Ga. Evidence is the high Oxygen-18 values of 8.5 and micro-inclusions of SiO2 in these zircon crystals consistent with growth from a granitic source supracrustal material, low-temperature interactions and a liquid ocean.) Современные суперконтиненты Афроевразия (~5 миллионов лет назад — наши дни) Америка (~15 миллионов лет назад — наши дни) Евразия (~60 миллионов лет назад — наши дни) Возможные будущие суперконтиненты Пангея Ультима или Амазия (через ~250 — ~400 миллионов лет); Австралия-Антарктида-Афроевразия (через ~130 миллионов лет). Антарктида объединится с южной Австралией или Азией, которые к тому моменту будут составлять один суперконтинент. Австралия-Афроевразия (через ~60 миллионов лет) — Австралия столкнётся с восточной Азией с образованием горной цепи, сравнимой с существующей в Гималаях.