Questions tagged [orogeny]
concerning processes leading to large-scale deformation of the Earth's surface, particularly mountain-building events
15
questions
1
vote
0
answers
44
views
Geology of the San Gabriel mountains in the Angeles national forest - rock types
I'm not a geologist, I am a hiker. And after many hikes in California's Sierra Nevada and Utah's red country I figured it would be great to learn some geology and I'm just posting this question to see ...
- 11
3
votes
0
answers
66
views
Why the difference between Italian coastlines and mountain ranges?
Italy’s relatively straight, parallel coastlines in the main part of the “boot” seem surprising given how the Apennines snake through it, from one side to the other and back. Don’t coastlines usually ...
- 333
11
votes
1
answer
1k
views
Origin of Andaman and Nicobar islands
Are Andaman and Nicobar islands in Indian ocean a continuation of Alpide-Himalayan orogeny or are they volcanic in origin?
- 381
5
votes
4
answers
632
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 ...
- 51
4
votes
1
answer
215
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 ...
- 153
9
votes
4
answers
4k
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 (...
- 435
5
votes
1
answer
361
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 ...
- 53
1
vote
0
answers
300
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?
- 111
4
votes
2
answers
211
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 ...
- 41
1
vote
1
answer
55
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.
17
votes
3
answers
11k
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?
- 173
7
votes
1
answer
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 ...
12
votes
1
answer
385
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 ...
- 223
8
votes
1
answer
6k
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 ...
- 3,823
15
votes
3
answers
220
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 ...
- 3,823