Questions tagged [orogeny]

concerning processes leading to large-scale deformation of the Earth's surface, particularly mountain-building events

Filter by
Sorted by
Tagged with
17
votes
3answers
8k views

Is there a reason most mountain ranges seem to run parallel to coastlines?

Eyeballing a map of the world, it seems that most mountain ranges that don't occur along continental fault lines run parallel to coastlines. Is there a reason for this?
15
votes
3answers
208 views

What supports the Rockies?

What supports the Rocky Mountains in North America? Or put another way, Why are they there? and Why are they still there? It might be tempting to think of compression, especially in an east-west ...
12
votes
1answer
357 views

What is the current theory about the formation of Tibet?

Although I basically understand, that how the Himalayas formed, it has always confused me how did the vast high Tibetian Plateau came into existence behind it? And what would be its future, is it ...
9
votes
4answers
3k views

Do divergent tectonic plates destroy mountains?

Tectonic plates meeting (convergent plates) form mountains. But if those plates change direction (which I am just assuming they can over time, I have no idea if it's true) and start pulling apart (...
8
votes
1answer
4k views

Correlating the Caledonian and Appalachian Orogenies

The Caledonian mountains and Appalachian mountains are recognised to be the roots of the same Palaeozoic orogenic belt. This has since been split in two with the opening of the Atlantic. On the ...
7
votes
1answer
304 views

Alpine schistosity

I often find the term Alpine schistosity (schistosité alpine in French, scistosità alpina in Italian) in texts about Alpine geology. Chronologically ordered phases of Alpine schistosity producing ...
5
votes
1answer
248 views

How are small mountains created?

I understand that large mountain ranges like the Rockies are created by the tectonic plates moving. I live in Arizona and there are a lot of mountains here but from what I understand, there are no ...
4
votes
3answers
499 views

Are the cores of every mountain range igneous?

Every volcano is a mountain, but not every mountain is a volcano. Still, it strikes me that--at least for the mountain ranges I can think of in this moment--they all seem to have igneous cores. Is ...
4
votes
2answers
154 views

Relative dating of granite pluton

In selecting a sample for age-dating of a granite pluton, which site is a better site to collect a sample from, the centre, top or side? Why was this site a better choice? Which dating method would ...
1
vote
1answer
54 views

What is the value of calculating the elevation of mountains in the past? (paleoelevation)

I would like to know if knowing the history(elevation, temperature, etc) of montains has any application, different from killing curiosity of scientist.
1
vote
0answers
36 views

Are the Olympic Mountains (in Washington state) geologically unique?

So it is my understanding the Washington's Olympic Mountains are basaltic mountains. The reason is that they formed from the upthrust of Ocean crust rather than continental crust as the Farallon plate ...
1
vote
0answers
208 views

Largest mountain range

The major mountain chains of Earth are found near: Convergent (subduction) and convergent (collisional) boundaries or transform boundaries? it should be both subduction and collisional right?