Re: zeolite and prehnite-pumpellyite facies metabasalts
Sorry, forgot link, is below
From: Dave Pattison
Sent: Friday, January 31, 2025 15:30
To: Matt Kohn mattkohn@boisestate.edu; msa-talk@minlists.org
Subject: RE: [MSA-talk] Re: zeolite and prehnite-pumpellyite facies metabasalts
Hi all. This may only be of tangential interest – no zeolites - but Paul Starr published a thorough study on a superb sequence of metabasalts from prehnite- pumpellyite facies to lower amphibolite facies near Flin Flon, Manitoba. Dave
https://ucalgary.ca/sites/default/files/teams/373/20Starr1-JMG-FF.pdf
From: Matt Kohn via MSA-talk <msa-talk@minlists.orgmailto:msa-talk@minlists.org>
Sent: Friday, January 31, 2025 13:33
To: msa-talk@minlists.orgmailto:msa-talk@minlists.org
Subject: [MSA-talk] Re: zeolite and prehnite-pumpellyite facies metabasalts
[△EXTERNAL]
Hi,
I’ve tried posting this message a couple times, but the link to Perkins et al. in the last paragraph isn’t working. So, just copy and paste.
Hi Kent,
I suspect my response won’t help you much at this date, but Allen Glazner and I decided to just lump both facies into “incipient metamorphism” and not talk about them directly as a facies. There are several reasons for that decision – it’s hard to find good teaching materials, it’s hard to establish equilibrium, and there’s not a lot of research on those facies (as a facies – lots of work on zeolites, of course).
Also, in the context of teaching igneous and metamorphic petrology, I don’t really teach metamorphic facies for facies sake. Rather, following Allen’s approach, I teach about processes and the mineral assemblages that go along with them. This can include facies, but doesn’t have to. So, I put my examples of zeolites (which I purchased off the internet, BTW) in the section on alteration of oceanic crust at mid-ocean ridges. There, I have examples of metamorphism of basalts and gabbros (zeolitized basalt, greenschists, amphibolites, granulites), but also altered ultramafic rocks (serpentinites and orthoamphibole rocks). Facies does come up, but that’s not really the point of the lab. There’s an earlier lab (by a couple weeks) on the formation of oceanic crust with rocks like basalts, gabbros, and peridotites – the feed stock for the more important metamorphic rocks. ;)
Anyway, something that might help – Dex Perkins, John Brady, and I posted several photos of zeolites to our book (https://optical.minpet.org) including some amygdaloidal basalts. For the ones I contributed, I spent quite a lot of time finding a range of zeolites on ebay/etsy and verifying their identify with Raman before labeling the photos. So, you can be sure they’re ID’d correctly. Personally, I find them texturally interesting, but optically rather dull (sorry to any zeolitiphiles out there). Except the gmelinite (online fig. 2.6.6). That’s a beauty!
Best,
Matt
Note: While I may send email outside of regular business hours, I do not expect the same from others.
Dr. Matthew J. Kohn, University Distinguished Professor
Department of Geosciences, Boise State University
1910 University Dr.; MS1535
Boise, ID 83725-1535
mattkohn@boisestate.edumailto:mattkohn@boisestate.edu
https://www.boisestate.edu/earth/people/matthew-j-kohn/
fax: (208)-426-4061
Pronouns: He/him/his
China book:
https://www.amazon.com/dp/B0BRXWNTS6,
https://www.amazon.com/dp/B0BRZ2XRV9
Optical Mineralogy Book:
https://optical.minpet.org/
Petrology and Plate Tectonics Book:
https://global.oup.com/academic/product/petrology-and-plate-tectonics-9780190490645
On Jan 28, 2025, at 7:30 AM, Kent Ratajeski via MSA-talk <msa-talk@minlists.orgmailto:msa-talk@minlists.org> wrote:
All,
Another teaching-oriented question for you. In lecture, I will include brief discussions of the zeolite and prehnite-pumpellyite metamorphic facies, but I'm wondering what to do for the lab. We have tons of amygdaloidal basalts with white and greenish minerals in the vesicles, but that isn't really enough to establish equilibrium mineral assemblages for the whole rock. As I understand it, metabasalts are actually resistant to zeolite facies metamorphism, and metasediments are where you see actual equilibrium mineral assemblages. Is that true for prehnite-pumpellyite as well?
So what do I do? (A) Throw the samples in there, but say something like "this may or may not actually be an example of the [zeolite/preh-pump] facies, or (B) err on the side of simplicity and sacrifice accuracy and honesty and say "white amygdaloids = zeolite facies; green amygdaloids = preh-pump facies?
Kent
Dr. Kent Ratajeski
Lecturer and Dice Mineralogical Museum Director
North Hall 081
Department of Geology, Geography, and Environment
Calvin University
3201 Burton St. SE
Grand Rapids, MI 49546
(616) 526-6769
https://calvin.edu/directory/people/kent-ratajeski
MSA-talk mailing list -- msa-talk@minlists.orgmailto:msa-talk@minlists.org
To unsubscribe send an email to msa-talk-leave@minlists.orgmailto:msa-talk-leave@minlists.org
Thanks, Dave.
I agree Paul’s study is outstanding, and I recommend his paper highly.
I hope no one took my message to imply that there’s no good research on Z/PP metamorphism. Paul’s is a perfect counter example. I only meant that there’s not very much in the context of facies, so students aren’t likely to encounter this research.
On the other hand, it’s under incipient metamorphic conditions that C-sequestration can occur. That’s probably a lot more important to the average person and immediate societal goals than other metamorphic topics, and a good reason to teach the subject.
Best,
Matt
On Jan 31, 2025, at 3:31 PM, Dave Pattison pattison@ucalgary.ca wrote:
Sorry, forgot link, is below
From: Dave Pattison
Sent: Friday, January 31, 2025 15:30
To: Matt Kohn mattkohn@boisestate.edu; msa-talk@minlists.org
Subject: RE: [MSA-talk] Re: zeolite and prehnite-pumpellyite facies metabasalts
Hi all. This may only be of tangential interest – no zeolites - but Paul Starr published a thorough study on a superb sequence of metabasalts from prehnite- pumpellyite facies to lower amphibolite facies near Flin Flon, Manitoba. Dave
https://ucalgary.ca/sites/default/files/teams/373/20Starr1-JMG-FF.pdf https://ucalgary.ca/sites/default/files/teams/373/20Starr1-JMG-FF.pdf
From: Matt Kohn via MSA-talk <msa-talk@minlists.org mailto:msa-talk@minlists.org>
Sent: Friday, January 31, 2025 13:33
To: msa-talk@minlists.org mailto:msa-talk@minlists.org
Subject: [MSA-talk] Re: zeolite and prehnite-pumpellyite facies metabasalts
[△EXTERNAL]
Hi,
I’ve tried posting this message a couple times, but the link to Perkins et al. in the last paragraph isn’t working. So, just copy and paste.
Hi Kent,
I suspect my response won’t help you much at this date, but Allen Glazner and I decided to just lump both facies into “incipient metamorphism” and not talk about them directly as a facies. There are several reasons for that decision – it’s hard to find good teaching materials, it’s hard to establish equilibrium, and there’s not a lot of research on those facies (as a facies – lots of work on zeolites, of course).
Also, in the context of teaching igneous and metamorphic petrology, I don’t really teach metamorphic facies for facies sake. Rather, following Allen’s approach, I teach about processes and the mineral assemblages that go along with them. This can include facies, but doesn’t have to. So, I put my examples of zeolites (which I purchased off the internet, BTW) in the section on alteration of oceanic crust at mid-ocean ridges. There, I have examples of metamorphism of basalts and gabbros (zeolitized basalt, greenschists, amphibolites, granulites), but also altered ultramafic rocks (serpentinites and orthoamphibole rocks). Facies does come up, but that’s not really the point of the lab. There’s an earlier lab (by a couple weeks) on the formation of oceanic crust with rocks like basalts, gabbros, and peridotites – the feed stock for the more important metamorphic rocks. ;)
Anyway, something that might help – Dex Perkins, John Brady, and I posted several photos of zeolites to our book (https://optical.minpet.org https://optical.minpet.org/) including some amygdaloidal basalts. For the ones I contributed, I spent quite a lot of time finding a range of zeolites on ebay/etsy and verifying their identify with Raman before labeling the photos. So, you can be sure they’re ID’d correctly. Personally, I find them texturally interesting, but optically rather dull (sorry to any zeolitiphiles out there). Except the gmelinite (online fig. 2.6.6). That’s a beauty!
Best,
Matt
Note: While I may send email outside of regular business hours, I do not expect the same from others.
Dr. Matthew J. Kohn, University Distinguished Professor
Department of Geosciences, Boise State University
1910 University Dr.; MS1535
Boise, ID 83725-1535
mattkohn@boisestate.edu mailto:mattkohn@boisestate.edu
https://www.boisestate.edu/earth/people/matthew-j-kohn/ https://www.boisestate.edu/earth/people/matthew-j-kohn/
fax: (208)-426-4061
Pronouns: He/him/his
China book:
https://www.amazon.com/dp/B0BRXWNTS6 https://www.amazon.com/dp/B0BRXWNTS6,
https://www.amazon.com/dp/B0BRZ2XRV9 https://www.amazon.com/dp/B0BRZ2XRV9
Optical Mineralogy Book:
https://optical.minpet.org/ https://optical.minpet.org/
Petrology and Plate Tectonics Book:
https://global.oup.com/academic/product/petrology-and-plate-tectonics-9780190490645 https://global.oup.com/academic/product/petrology-and-plate-tectonics-9780190490645
On Jan 28, 2025, at 7:30 AM, Kent Ratajeski via MSA-talk <msa-talk@minlists.org mailto:msa-talk@minlists.org> wrote:
All,
Another teaching-oriented question for you. In lecture, I will include brief discussions of the zeolite and prehnite-pumpellyite metamorphic facies, but I'm wondering what to do for the lab. We have tons of amygdaloidal basalts with white and greenish minerals in the vesicles, but that isn't really enough to establish equilibrium mineral assemblages for the whole rock. As I understand it, metabasalts are actually resistant to zeolite facies metamorphism, and metasediments are where you see actual equilibrium mineral assemblages. Is that true for prehnite-pumpellyite as well?
So what do I do? (A) Throw the samples in there, but say something like "this may or may not actually be an example of the [zeolite/preh-pump] facies, or (B) err on the side of simplicity and sacrifice accuracy and honesty and say "white amygdaloids = zeolite facies; green amygdaloids = preh-pump facies?
Kent
Dr. Kent Ratajeski
Lecturer and Dice Mineralogical Museum Director
North Hall 081
Department of Geology, Geography, and Environment
Calvin University
3201 Burton St. SE
Grand Rapids, MI 49546
(616) 526-6769
https://calvin.edu/directory/people/kent-ratajeski https://calvin.edu/directory/people/kent-ratajeski
MSA-talk mailing list -- msa-talk@minlists.org mailto:msa-talk@minlists.org
To unsubscribe send an email to msa-talk-leave@minlists.org mailto:msa-talk-leave@minlists.org
That is an excellent paper! 40 years ago Steve Chipera and I collected rocks from that same area but could not figure out what to do with them. Congrats to Paul.
Dexter Perkins
Dept. Geology and Geological Engineering
University of North Dakota
Grand Forks ND 58202
(701)777-2991o; (701)757-0579h
dexter.perkins@engr.und.edu
From: Matt Kohn via MSA-talk msa-talk@minlists.org
Sent: Friday, January 31, 2025 5:10 PM
To: Dave Pattison pattison@ucalgary.ca
Cc: msa-talk@minlists.org
Subject: [MSA-talk] Re: zeolite and prehnite-pumpellyite facies metabasalts
Thanks, Dave.
I agree Paul’s study is outstanding, and I recommend his paper highly.
I hope no one took my message to imply that there’s no good research on Z/PP metamorphism. Paul’s is a perfect counter example. I only meant that there’s not very much in the context of facies, so students aren’t likely to encounter this research.
On the other hand, it’s under incipient metamorphic conditions that C-sequestration can occur. That’s probably a lot more important to the average person and immediate societal goals than other metamorphic topics, and a good reason to teach the subject.
Best,
Matt
On Jan 31, 2025, at 3:31 PM, Dave Pattison <pattison@ucalgary.camailto:pattison@ucalgary.ca> wrote:
Sorry, forgot link, is below
From: Dave Pattison
Sent: Friday, January 31, 2025 15:30
To: Matt Kohn <mattkohn@boisestate.edumailto:mattkohn@boisestate.edu>; msa-talk@minlists.orgmailto:msa-talk@minlists.org
Subject: RE: [MSA-talk] Re: zeolite and prehnite-pumpellyite facies metabasalts
Hi all. This may only be of tangential interest – no zeolites - but Paul Starr published a thorough study on a superb sequence of metabasalts from prehnite- pumpellyite facies to lower amphibolite facies near Flin Flon, Manitoba. Dave
https://ucalgary.ca/sites/default/files/teams/373/20Starr1-JMG-FF.pdf
From: Matt Kohn via MSA-talk <msa-talk@minlists.orgmailto:msa-talk@minlists.org>
Sent: Friday, January 31, 2025 13:33
To: msa-talk@minlists.orgmailto:msa-talk@minlists.org
Subject: [MSA-talk] Re: zeolite and prehnite-pumpellyite facies metabasalts
[△EXTERNAL]
Hi,
I’ve tried posting this message a couple times, but the link to Perkins et al. in the last paragraph isn’t working. So, just copy and paste.
Hi Kent,
I suspect my response won’t help you much at this date, but Allen Glazner and I decided to just lump both facies into “incipient metamorphism” and not talk about them directly as a facies. There are several reasons for that decision – it’s hard to find good teaching materials, it’s hard to establish equilibrium, and there’s not a lot of research on those facies (as a facies – lots of work on zeolites, of course).
Also, in the context of teaching igneous and metamorphic petrology, I don’t really teach metamorphic facies for facies sake. Rather, following Allen’s approach, I teach about processes and the mineral assemblages that go along with them. This can include facies, but doesn’t have to. So, I put my examples of zeolites (which I purchased off the internet, BTW) in the section on alteration of oceanic crust at mid-ocean ridges. There, I have examples of metamorphism of basalts and gabbros (zeolitized basalt, greenschists, amphibolites, granulites), but also altered ultramafic rocks (serpentinites and orthoamphibole rocks). Facies does come up, but that’s not really the point of the lab. There’s an earlier lab (by a couple weeks) on the formation of oceanic crust with rocks like basalts, gabbros, and peridotites – the feed stock for the more important metamorphic rocks. ;)
Anyway, something that might help – Dex Perkins, John Brady, and I posted several photos of zeolites to our book (https://optical.minpet.orghttps://optical.minpet.org/) including some amygdaloidal basalts. For the ones I contributed, I spent quite a lot of time finding a range of zeolites on ebay/etsy and verifying their identify with Raman before labeling the photos. So, you can be sure they’re ID’d correctly. Personally, I find them texturally interesting, but optically rather dull (sorry to any zeolitiphiles out there). Except the gmelinite (online fig. 2.6.6). That’s a beauty!
Best,
Matt
Note: While I may send email outside of regular business hours, I do not expect the same from others.
Dr. Matthew J. Kohn, University Distinguished Professor
Department of Geosciences, Boise State University
1910 University Dr.; MS1535
Boise, ID 83725-1535
mattkohn@boisestate.edumailto:mattkohn@boisestate.edu
https://www.boisestate.edu/earth/people/matthew-j-kohn/
fax: (208)-426-4061
Pronouns: He/him/his
China book:
https://www.amazon.com/dp/B0BRXWNTS6,
https://www.amazon.com/dp/B0BRZ2XRV9
Optical Mineralogy Book:
https://optical.minpet.org/
Petrology and Plate Tectonics Book:
https://global.oup.com/academic/product/petrology-and-plate-tectonics-9780190490645
On Jan 28, 2025, at 7:30 AM, Kent Ratajeski via MSA-talk <msa-talk@minlists.orgmailto:msa-talk@minlists.org> wrote:
All,
Another teaching-oriented question for you. In lecture, I will include brief discussions of the zeolite and prehnite-pumpellyite metamorphic facies, but I'm wondering what to do for the lab. We have tons of amygdaloidal basalts with white and greenish minerals in the vesicles, but that isn't really enough to establish equilibrium mineral assemblages for the whole rock. As I understand it, metabasalts are actually resistant to zeolite facies metamorphism, and metasediments are where you see actual equilibrium mineral assemblages. Is that true for prehnite-pumpellyite as well?
So what do I do? (A) Throw the samples in there, but say something like "this may or may not actually be an example of the [zeolite/preh-pump] facies, or (B) err on the side of simplicity and sacrifice accuracy and honesty and say "white amygdaloids = zeolite facies; green amygdaloids = preh-pump facies?
Kent
Dr. Kent Ratajeski
Lecturer and Dice Mineralogical Museum Director
North Hall 081
Department of Geology, Geography, and Environment
Calvin University
3201 Burton St. SE
Grand Rapids, MI 49546
(616) 526-6769
https://calvin.edu/directory/people/kent-ratajeski
MSA-talk mailing list -- msa-talk@minlists.orgmailto:msa-talk@minlists.org
To unsubscribe send an email to msa-talk-leave@minlists.orgmailto:msa-talk-leave@minlists.org