torstai 18. heinäkuuta 2013

Iapetus ja Rheic meret


Abstract

Differences in the origin and evolution of the Iapetan and Rheic oceans profoundly affected the development of the Ouachitan–Appalachian–Variscan orogen. The Iapetus Ocean was initiated in the Late Neoproterozoic–Early Cambrian by the separation of large continental landmasses (Laurentia, Baltica, Gondwana), whereas the Rheic Ocean originated in the Late Cambrian–Early Ordovician as the result of the separation of several ribbon continents, collectively termed peri-Gondwanan terranes, from the northern margin of Gondwana. Compared to the classic passive margin developed along the Laurentian margin of Iapetus, passive margin successions to the Rheic Ocean are more limited in extent.

During convergence, both margins of the Iapetus Ocean developed western Pacific-type arc–back-arc systems, whereas subduction of the Rheic Ocean was primarily directed beneath Laurentia and was Andean in style. Closure of Iapetus involved a number of arc–back-arc accretionary events and had occurred by the Middle Silurian as a result of Laurentia–Baltica collision (to form Laurussia) and the accretion of the peri-Gondwanan terranes. Rheic Ocean closure occurred in the Carboniferous by way of continent–continent collision between Laurussia and Gondwana, with Gondwana on the lower plate.
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Lue koko teksti Comparative evolution of the Iapetus and Rheic Oceans: A North American perspective.


Äänestämme...
Kuka haluaa ottaa Appalakien muodostumisen teemaksi, käsi ylös?

Kuka haluaa jatkaa tutustumista Miguahsan maisemiin ja jättää Appalakien synnyn ja suuret alkumeret Iapetuksen ja Rheic ammattilaisten päänsäryksi?

Okay.

Jatkamme yhteisellä päätöksellä tutustumista Miguashan kaloihin ja muuhun vedessä vilisevään Jumalan siunaamaan elämään!

Myönnän auliisti, että pieni peptalk härän sarvista ei auttanut nyt, ei edes itseäni...


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