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19 Answered Questions for the topic Geochemistry

Geochemistry Physical Science Geology

07/22/19

Upon breaking apart andesite, what do you get?

I'm aware that andesite consists of about 60 percent silica and as for minerals, pretty sure it's usually pyroxene and plagioclase. What form would these take on if they were to be separated?... more
Geochemistry Physical Science Geology

07/19/19

Is porphyritic texture always indicative of a 2 stage cooling process?

Is porphyritic texture always indicative of a 2 stage cooling process? Can't the phenocrysts and groundmass be formed at the same time depending upon the chemical constituents forming the rock? The... more
Geochemistry Physical Science Geology

07/07/19

What controls the acidity of the ocean?

I have learned that: * coral reefs are made up mostly of calcium carbonate * coral reefs are mainly distributed in the tropical zone * The calcium carbonate will be decomposed in the reaction... more
Geochemistry Physical Science Geology

07/03/19

What is the difference between mineral groups and series?

It seems to me when reading about minerals, groups and series are spoken about interchangably in similar types of contexts. Is there a difference? If so, what?
Geochemistry Physical Science Geology

07/01/19

Why silicon is abundant in earth surface?

What is the reason for having silicon in so large quantity on earth surface?
Geochemistry Physical Science Geology

06/25/19

Why are alkali basalts found at rifting centres and on top of 'plumes', whereas MORBs are generally tholeiitic?

So I was essentially wondering why it was that the basalts on top of 'plumes' at 'hotspots' (sometimes called OIBs, ocean island basalts) and at continental rifting centres are enriched in alkaline... more
Geochemistry Geology Plate Tectonics

06/11/19

What was the likely composition of Earth's early crust (how did crustal composition evolve)?

Was the first crust entirely mafic (oceanic) crust which was later distilled via volcanic arcs along subduction zones to make felsic rocks or did the earth start with bits of felsic crust?Are the... more
Geochemistry Geology Volcanology

06/08/19

Is the magma in one volcano different from the magma in every other volcano?

Is there a significant difference between the magma in different volcanoes? If so, why?Doesn't all magma come from the same place if you go down deep enough?
Geochemistry Geology Mineralogy

06/02/19

Are there minerals which are not been found on earth but which are still possible to exist?

On Earth we find many kind of minerals, a lot of them are silicates. How much different kind of minerals would there be on Earth?But are there Fe minerals found in meteorites which do no occur on... more
Geochemistry Geology Geophysics

05/30/19

Why is continental crust less dense than oceanic?

Why is it that continental crust is less dense than oceanic, where in fact continental crust is thicker than oceanic crust?
Geochemistry Geology Petrology

05/11/19

What are the high field strength and large ion lithophile (HFS or HFSE & LIL or LILE) elements?

There are two groups of elements that are frequently mentioned when discussing incompatible trace elements. They are the high field strength elements (HFS or HFSE) and the large ion lithophile... more
Geochemistry Geology Meteorite

05/02/19

Which theory is stronger, that iron came from outside or was formed within earth?

Where is the current body of science learning towards, that iron came from meteor or it was somehow formed on earth?
Geochemistry Physical Science Geology

04/28/19

Is the magma in one volcano different from the magma in every other volcano?

First off, a confession: I'm asking this question because of *The Lord of the Rings*. If you're not aware already, in the story, a magical ring can only be destroyed in a specific volcano. The... more
Geochemistry Geology Teaching

04/26/19

Recreating the rock cycle?

I want to recreate the rock cycle using some item that can behave as a rock. The purpose of this is to get a point across to my students about how really there is a reason why the rock cycle is... more
Geochemistry Physical Science Geology

03/27/19

Why is continental crust less dense than oceanic?

Why is it that continental crust is less dense than oceanic, where in fact continental crust is thicker than oceanic crust?
Geochemistry Geology Rocks

03/27/19

What was the first rock in the rock cycle?

I am an undergraduate student but I am a tutor at a High School, and one student asked me. Attempting to explain the rock cycle "if one rock turns into the other then which came first" my gut is... more
Geochemistry Geology Earth History

03/27/19

Why silicon is abundant in earth surface?

What is the reason for having silicon in so large quantity on earth surface?
Geochemistry Physical Science Geology

03/19/19

What was the first rock in the rock cycle?

I am an undergraduate student but I am a tutor at a High School, and one student asked me. Attempting to explain the rock cycle "if one rock turns into the other then which came first" my gut is... more
Geochemistry Geology Geophysics

03/19/19

Magma resultant from group 1 and group 2 elements?

I was recently speaking with a geology professor over lunch at a university who has a theory that I've never heard before. His postulation was quite compelling and I was hoping to do a little... more

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