Questions tagged [petrology]

Petrology is the study of rocks and the processes that lead to their formation and alteration.

11 questions with no upvoted or accepted answers
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What is the global distribution of oil filled geodes?

In a general 40 mile radius of Keokuk, Iowa many sedimentary geodes can be found. They are abundant in the Warsaw Formation with the type section at Geode Glenn in Warsaw, Illinois. In one specific ...
8
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0answers
101 views

How can I find a large petrology dataset?

I need a large dataset of the oxide components of peridotitic rocks and their manual classification for a project of mine. The only one that I managed to find was from the EarthChem database and it is ...
4
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0answers
92 views

What causes a change in composition from basanite to nephelinite?

Can the change in composition from basanite to nephelinite (i.e. increasing alkalis with decreasing SiO2) be explained in terms of fractional crystallisation, or only by a decreasing degree of partial ...
4
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0answers
51 views

Lithologic and hydrostratigraphic logs for the Deccan volcanic province, India

I need data on depth/thickness of of different lithologic units under Deccan Volcanic Province in MP, Maharashtra and Gujarat. For this if anyone can help in providing help in obtaining well log data ...
3
votes
2answers
116 views

Can we separate a sandy, clayey & salt layer on basis of their rheological properties?

Since, given enough compaction, salt is able to behave like a fluid & buoyant too if it's overlain by a higher density rock (it could be fine grained clay or a sandy sequence). But in another case,...
2
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0answers
36 views

What is the electrical conductivity of a liquid Komatiite?

I am searching for previous work that has determined the electrical conductivity range for komatiites at the surface. Does anyone have some values or references?
2
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1answer
78 views

regarding four-way closure in structural geology

I am a little bit confused on the two concepts in structural geology, i.e., what is the relationship of anticline and four-way closure. My understanding is that anticline belongs to four-way closure. ...
2
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0answers
15 views

Does fold tightness correlate to deformation intensity?

I'm studying a migmatite with two overprinting fold structures. The first (Dn+1) is tight and the second (Dn+2) is gentle. Would it be fair to assume that, since Dn+1's tightness is, well, tighter, ...
1
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26 views

What are Shoshonites? What conditions make them occur instead of andesites?

What is the significance of shoshonites? Why in some convergent margins, do shoshonites occur instead of andesites?
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0answers
283 views

What is solidus and liquidus temperature of granite?

My understanding is that because a rock is composed of variety of minerals, so it does not have fix melting point, rather there is a range below which whole rock is solid and above which whole rock is ...
1
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29 views

South American Rocks

I'm thinking of visiting South America at some stage, to look at some interesting geology in the Atacama, Patagonian Andes, etc. Does anyone know where the best geological museum is in South America? ...