Thank you so much!! you have literally explained this topic in 8 mins, which my instructor kinda explained it in 3 full lectures, yet I could not understand it from him. You are so good in this hope you reach places!! xoxo
Very nice. Excellent explanations and animations. Great work. One comment: at 5 minutes the evolution of the system after the peritectic reaction has the blue dot moving from olivine to enstatite as the system cools down. However, that is not going to be the case. The blue dot should disappear (as olivine is consumed) and a new dot (maybe a different color?) should appear to the left of the green symbol (on the enstatite line). From then on all three symbols (the new symbol for enstatite + the green and yellow symbols) would move down but remain linked by a horizontal line. Just posting this note as I think readers may also have that question.
Thanks for the comment! Yes, this is a good point. Once olivine is consumed in the reaction with the liquid, I should have represented enstatite with a new symbol rather than animate what initially represented olivine. As a further note for any readers, the olivine would disappear if the system was undergoing batch crystallization. In fractional crystallization examples, olivine cumulates may have already been removed but have not undergone a peritectic reaction and these would evolve separately to essentially dunites if all liquid was effectively removed. - thus the liquid can only react with olivine it remains equilibrated with.
Sir is their any way to speak to u about a doubt I have in this example 2. Is it so that after the liquid at eutectic is totally consumed why is the green sytem mark evolving and not the yellow point on which we are eventually discussing the discontinuous reaction l=cristobalite + enstatite. ?? wont that point move down after F=1? 5:32 If all my liquid gets consumed to form the eutectic mixture what will remain in the system ?? If nothing remains in the system how can it evolve further equilibrium conditions😅 I know Im missing out on some minor point or concept but really very anxious to find the missing piece. It would be a great favour if you help me to clear the doubt🙏❤❤❤❤❤
Hi Lai, it should be 59% liquid so not sure how missed that so thanks! You can see liquid will be the dominant phase since the line nearer the y axis is longer!
Hi Will, Im really sorry but i just dont understand... Can you please explain again about the Congruent reaction and how its different from the incongruent reaction. Many thanks Big J
Hi Big J. What a great question! Sure, a congruent reaction is a continuous reaction like how you like you + football = off-target and so on. Incongruent reactions are discontinuous so me + football = goal since there is no more goals after the first Hope this helps
Hi Lorraine, thanks for the question 😎 if I remember my colour scheme correctly, the blue diamond represents the composition of the crystallising mineral(s), the green represents the whole system, and the gold represents the evolution of the co-existing liquid.
Hi Susil, thanks for your comment. Are you referring to when olivine becomes replaced by pyroxene during peritectic reaction? or how olivine rimmed by pyroxene happens in real rocks? just want to understand your question better :)
@@opti_misticsusil7633 No need for sir, Will is fine! haha - sure. So olivine is typically the first phase to crystalline in a mantle-derived magma. As the magma cools, other minerals will want to start crystallising. When we get to the peritectic point, pyroxene will want to crystalline at the expense of olivine (suggest watching my Bowen's Reaction Series video too!). Because of this there will be a reaction: olivine + liquid = pyroxene. One of those reactants will be consumed first. If liquid is consumed first, we might see olivine with pyroxene rims. If the olivine is consumed first, the system will progress to the right of the diagram in this video! Hope this helps
Hi Jay. Sure! Essentially, in these incongruent (or discontinuous) reactions, the solid (olivine in this case) and the liquid react to make a second solid (pyroxene in this case). Therefore, Olivine and Liquid are reactants. There is a finite amount of both Olivine and Liquid and they will continue to react to make pyroxene until either Olivine or Liquid are exhausted. If the liquid is exhausted first - the system is solidified. If the olivine is consumed first, the liquid will continue to evolve towards the eutectic. Hope this helps.
William, my guy, thanks a lot for these videos, they're brilliant! Quick question; in the last example, when the silica-rich liquid crystallises, the green dot ends in the enstatite + cristobalite region at around 1500deg.C, but if you were to further cool that towards 1400deg.C, would the remaining cristobalite react into the tridymite?
Thank god. this helps much compared to my 12 weeks of lecture
i guess I'm pretty randomly asking but do anybody know of a good website to stream new tv shows online ?
@Julian Amir i would suggest Flixzone. Just google for it :)
@Xander Benton Yea, I've been watching on FlixZone for since march myself :)
@Xander Benton Thank you, I signed up and it seems like a nice service =) I really appreciate it!
@Julian Amir You are welcome =)
Thank you so much!! you have literally explained this topic in 8 mins, which my instructor kinda explained it in 3 full lectures, yet I could not understand it from him. You are so good in this hope you reach places!! xoxo
Very nice. Excellent explanations and animations. Great work. One comment: at 5 minutes the evolution of the system after the peritectic reaction has the blue dot moving from olivine to enstatite as the system cools down. However, that is not going to be the case. The blue dot should disappear (as olivine is consumed) and a new dot (maybe a different color?) should appear to the left of the green symbol (on the enstatite line). From then on all three symbols (the new symbol for enstatite + the green and yellow symbols) would move down but remain linked by a horizontal line. Just posting this note as I think readers may also have that question.
Thanks for the comment! Yes, this is a good point. Once olivine is consumed in the reaction with the liquid, I should have represented enstatite with a new symbol rather than animate what initially represented olivine. As a further note for any readers, the olivine would disappear if the system was undergoing batch crystallization. In fractional crystallization examples, olivine cumulates may have already been removed but have not undergone a peritectic reaction and these would evolve separately to essentially dunites if all liquid was effectively removed.
- thus the liquid can only react with olivine it remains equilibrated with.
Amazing! Love from India
Sir is their any way to speak to u about a doubt I have in this example 2. Is it so that after the liquid at eutectic is totally consumed why is the green sytem mark evolving and not the yellow point on which we are eventually discussing the discontinuous reaction l=cristobalite + enstatite. ?? wont that point move down after F=1? 5:32 If all my liquid gets consumed to form the eutectic mixture what will remain in the system ?? If nothing remains in the system how can it evolve further equilibrium conditions😅 I know Im missing out on some minor point or concept but really very anxious to find the missing piece. It would be a great favour if you help me to clear the doubt🙏❤❤❤❤❤
Thank you sir, you help me more than my professor 3 weeks of lectures
May I know if the percentage of solid stated at 3:27 is wrong? Is that 49%
Hi Lai, it should be 59% liquid so not sure how missed that so thanks! You can see liquid will be the dominant phase since the line nearer the y axis is longer!
@@WillDSmith95 thxxxx. Your videos always help!
What happens if you start at the top of Enstatite at 1587 degree and cool it?
Hi Will, Im really sorry but i just dont understand... Can you please explain again about the Congruent reaction and how its different from the incongruent reaction.
Many thanks
Big J
Hi Big J. What a great question! Sure, a congruent reaction is a continuous reaction like how you like you + football = off-target and so on. Incongruent reactions are discontinuous so me + football = goal since there is no more goals after the first
Hope this helps
What do each of the three diamonds signify, ie the gold, the blue and the green?
Hi Lorraine, thanks for the question 😎 if I remember my colour scheme correctly, the blue diamond represents the composition of the crystallising mineral(s), the green represents the whole system, and the gold represents the evolution of the co-existing liquid.
Can I get the equilibrium melting
Really love the explanation
My Man👍👍
Can u plz explain how reaction rim form between olivine and pyroxene with the peritectic diagram???
Hi Susil, thanks for your comment. Are you referring to when olivine becomes replaced by pyroxene during peritectic reaction? or how olivine rimmed by pyroxene happens in real rocks? just want to understand your question better :)
@@WillDSmith95 thanks for ur reply sir....i just wanna have clear concept on the both the issue that how reaction rim is formed and when...
@@opti_misticsusil7633 No need for sir, Will is fine! haha - sure. So olivine is typically the first phase to crystalline in a mantle-derived magma. As the magma cools, other minerals will want to start crystallising. When we get to the peritectic point, pyroxene will want to crystalline at the expense of olivine (suggest watching my Bowen's Reaction Series video too!). Because of this there will be a reaction: olivine + liquid = pyroxene. One of those reactants will be consumed first. If liquid is consumed first, we might see olivine with pyroxene rims. If the olivine is consumed first, the system will progress to the right of the diagram in this video! Hope this helps
@@WillDSmith95 thank you... definetly it works..
sir can you please explain the point about liq being consumed first or solid being consumed first i am unable t understand that part
Hi Jay. Sure! Essentially, in these incongruent (or discontinuous) reactions, the solid (olivine in this case) and the liquid react to make a second solid (pyroxene in this case). Therefore, Olivine and Liquid are reactants. There is a finite amount of both Olivine and Liquid and they will continue to react to make pyroxene until either Olivine or Liquid are exhausted. If the liquid is exhausted first - the system is solidified. If the olivine is consumed first, the liquid will continue to evolve towards the eutectic. Hope this helps.
William, my guy, thanks a lot for these videos, they're brilliant! Quick question; in the last example, when the silica-rich liquid crystallises, the green dot ends in the enstatite + cristobalite region at around 1500deg.C, but if you were to further cool that towards 1400deg.C, would the remaining cristobalite react into the tridymite?
Can u please tell the basalt saturation in this