thank you so much for this video! we're starting the igneous rocks section in my class tomorrow and was told if we didn't know this chart like the back of our hands we will struggle. I finally am getting a grasp of this!
I realize this is a basic overview. Most that are more detailed indicate that as the magma cools the olivine crystals in the cooling magma react with the magma to make pyroxene. I wonder if its less of a "reaction" but the isolated SiO4 tetrahedra of olivine then form single chains of tetrahedra to form the pyroxene? The elements of both are the same just in a different latice.
We have mandatory geology class at collage, the proffesor didnt explain much about this reaction series, so I am very happy you explained it, it helped me a lot. I wanted to ask though, I am not studying this in english and our proffesor was calling the discontinious branch as magma alcalic and the continous branch magma acidic. I mean he is probably right I just wanted to ask, if it is really like a thing with this, if those branches could be called that too ?
I do not remember hearing it described this way BUT at the top end there is more Calcium which is more basic (an alkali). On the bottom end there is more acidic activity. So I am guessing that is what he was referencing. I just feel that at an introductory level that detail is probably not needed!
Thank you a lot 💖 this was really helpful! But I have a question. When cooling down the magma, shouldn't we pass through the calcium rich plagioclase? Or the type of magma than creates olivine doesn't create the calcium rich plagioclase? (It's my first year studying geology and it's kind of confusing to me)
This video is definitely a simplification of what really happens. To answer your question, a given magma may only have ingredients to make the minerals at the bottom of the series. If that is the case as it cooled, it would not produce Ca-Plagioclase because it would not have the Calcium needed. Another magma might have what is needed to create the minerals at the top so when it started to cool, the Ca-Plagioclase would form. If you look into "felsic magmas" and "mafic magmas" this may help as felsic magmas have what is needed to form the minerals at the bottom whereas mafic magmas have what is needed to form the minerals at the top.
I had trouble with this; the textbook I have describes it as one mineral changing, or crystallizing, into a new mineral. It does state that this happens as the magma cools, but it doesn't say that the minerals drop out at certain temperatures, it says they change into something else; which I found confusing. Like, how could a mineral change into a different mineral.
My presentation is a little of an oversimplification. The text you reference is correct. Different minerals become stable and form under different conditions. So a mineral can morph during the process of cooling. BUT there is something called fractional crystallization and that definitely results in minerals "dropping out" as described here.
Thank you for the explanation, however I am still confuse why the left side is called discontinues series and the right side called as continuous series
It is because the minerals on the left side are discreet minerals. One forms in a certain temperature range and then no longer forms as the temperature drops. On the right side, it is a continuous process. The same mineral forms throughout the whole temperature drop but its composition goes from more Ca rich to more Na rich.
thank you so much for this video! we're starting the igneous rocks section in my class tomorrow and was told if we didn't know this chart like the back of our hands we will struggle. I finally am getting a grasp of this!
I am glad it helped. I think watching this AND listening to what your instructor has to say should really cement this concept for you!
Thank you for this video, I am in a intro geology class and it's hard for me to follow my professor. Your explain things very well!
I am so happy it helped! I have additional videos to help for future topics too.
Simple and easy explanation to that difficult concept! That was very helpful, thanks!!
I am so happy it was helpful!
Got it. Excellent explanation.
Great and clear explanation👍👍👍
So glad it helps!
I realize this is a basic overview. Most that are more detailed indicate that as the magma cools the olivine crystals in the cooling magma react with the magma to make pyroxene. I wonder if its less of a "reaction" but the isolated SiO4 tetrahedra of olivine then form single chains of tetrahedra to form the pyroxene? The elements of both are the same just in a different latice.
As you state, this is a basic overview for an intro class. It is as you describe but I think the term react is still valid.
We have mandatory geology class at collage, the proffesor didnt explain much about this reaction series, so I am very happy you explained it, it helped me a lot. I wanted to ask though, I am not studying this in english and our proffesor was calling the discontinious branch as magma alcalic and the continous branch magma acidic. I mean he is probably right I just wanted to ask, if it is really like a thing with this, if those branches could be called that too ?
I do not remember hearing it described this way BUT at the top end there is more Calcium which is more basic (an alkali). On the bottom end there is more acidic activity. So I am guessing that is what he was referencing. I just feel that at an introductory level that detail is probably not needed!
@@ruppertrocksgeology Thank you for your answer !
@@arthurhamishdent8389 No problem. Maybe some of my other videos will help you to. I am about to release several more in a few weeks!
thanks proff
You are welcome!
Thank you a lot 💖 this was really helpful!
But I have a question. When cooling down the magma, shouldn't we pass through the calcium rich plagioclase? Or the type of magma than creates olivine doesn't create the calcium rich plagioclase?
(It's my first year studying geology and it's kind of confusing to me)
This video is definitely a simplification of what really happens. To answer your question, a given magma may only have ingredients to make the minerals at the bottom of the series. If that is the case as it cooled, it would not produce Ca-Plagioclase because it would not have the Calcium needed. Another magma might have what is needed to create the minerals at the top so when it started to cool, the Ca-Plagioclase would form. If you look into "felsic magmas" and "mafic magmas" this may help as felsic magmas have what is needed to form the minerals at the bottom whereas mafic magmas have what is needed to form the minerals at the top.
perfect!
Thank you so much 😊
You are welcome!
I had trouble with this; the textbook I have describes it as one mineral changing, or crystallizing, into a new mineral. It does state that this happens as the magma cools, but it doesn't say that the minerals drop out at certain temperatures, it says they change into something else; which I found confusing. Like, how could a mineral change into a different mineral.
My presentation is a little of an oversimplification. The text you reference is correct. Different minerals become stable and form under different conditions. So a mineral can morph during the process of cooling. BUT there is something called fractional crystallization and that definitely results in minerals "dropping out" as described here.
thank you!!
I am glad this was helpful!
Thank you for the explanation, however I am still confuse why the left side is called discontinues series and the right side called as continuous series
It is because the minerals on the left side are discreet minerals. One forms in a certain temperature range and then no longer forms as the temperature drops. On the right side, it is a continuous process. The same mineral forms throughout the whole temperature drop but its composition goes from more Ca rich to more Na rich.
Good expplination mam
I am glad it was helpful!
❤
♥️♥️
I am glad this was helpful!
Thank you so much 😊
You are welcome. I am so happy my videos help others besides my students!