[Rockhounds] Rockhounds Digest, Vol 95, Issue 6
Jeffrey Joy
jeffreyjoy at gmail.com
Sun Nov 10 14:54:00 PST 2024
Re: rare magma article
Per Chat GPT:
“The relationship between diamond formation and carbonatite magmas is
speculative and centers around carbon sources and geological processes in
the Earth’s mantle. Carbonatite magmas are rare, carbonate-rich magmas
found deep in the Earth’s mantle, typically originating at depths where
diamonds form. The speculative link between these magmas and diamond
formation lies in several proposed mechanisms:
1. Carbon Source: Carbonatite magmas are rich in carbonates, which may
provide a significant carbon source for diamond formation. Diamonds form
under high-pressure, high-temperature conditions where carbon sources, such
as carbon dioxide or carbonate minerals, are available. Carbonatites could
potentially transport carbon from deeper in the mantle to areas where it
crystallizes as diamond.
2. Fluid Transport: Carbonatite magmas are highly mobile, fluid-like, and
can transport carbon and other elements through the mantle more effectively
than silicate magmas. This mobility might allow carbonatite magmas to
deliver carbon to “diamond stability zones” in the mantle, where diamonds
can crystallize from the carbon provided by the magma.
3. Diamond Inclusions: Some diamonds contain mineral inclusions similar in
composition to those found in carbonatite rocks, suggesting that diamonds
could crystallize in regions where carbonatite magmas are present. These
inclusions provide clues about the composition and conditions of the mantle
at the time of diamond formation, hinting at a link to carbonatite magma
processes.
4. Metasomatism: Carbonatite magmas can induce metasomatism, a process
where the chemical composition of surrounding rocks is altered by fluid or
magma interaction. This alteration could create favorable conditions for
diamond formation by introducing carbon and other necessary elements or
altering the temperature and pressure conditions in the surrounding mantle
rock.
5. Mantle Dynamics: The movement and evolution of carbonatite magmas in
the mantle could influence mantle dynamics, potentially creating pressure
and temperature environments conducive to diamond growth. While these ideas
are speculative, ongoing research on inclusions in diamonds, mantle
xenoliths (rock fragments from the mantle), and the chemistry of
carbonatite magmas continues to explore the potential connections between
carbonatite magmas and diamond formation.
On Sun, Nov 10, 2024 at 3:01 PM <rockhounds-request at rockhounds.drizzle.com>
wrote:
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> Today's Topics:
>
> 1. Mineral Evolution | ROBERT M. HAZEN (Jeffrey Joy)
> 2. Rare Magma Discovered as Volcano Sinks ? Could This Lead to
> New Dangers? (Kreigh Tomaszewski)
> 3. Re: Mineral Evolution | ROBERT M. HAZEN (Kreigh Tomaszewski)
> 4. Re: Rare Magma Discovered as Volcano Sinks ? Could This Lead
> to New Dangers? (axel.emmermann at telenet.be)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 9 Nov 2024 19:58:30 -0500
> From: Jeffrey Joy <jeffreyjoy at gmail.com>
> To: Rockhounds Submissions <rockhounds at rockhounds.drizzle.com>
> Subject: [Rockhounds] Mineral Evolution | ROBERT M. HAZEN
> Message-ID: <E45A8F97-C182-48B2-8F86-607E8A24A655 at gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> Found this fascinating
>
> https://hazen.carnegiescience.edu/research/mineral-evolution
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 9 Nov 2024 20:24:12 -0500
> From: Kreigh Tomaszewski <kreigh at gmail.com>
> To: "Rockhounds at drizzle.com: A mailing list for rock and gem
> collectors" <rockhounds at rockhounds.drizzle.com>
> Subject: [Rockhounds] Rare Magma Discovered as Volcano Sinks ? Could
> This Lead to New Dangers?
> Message-ID:
> <
> CACibpJKVs_6t+Ad9FHH0MkDy_xeeCP5_u9VsMvzS2JT6BmQkLg at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Ol Doinyo Lengai stands out among the world?s volcanoes for one
> extraordinary reason : it is the only active volcano known to produce
> carbonatite magma. This rare type of magma has an unusually low silica
> content, typically less than 25%, compared to the 45-70% found in other
> terrestrial magmas.
>
> The peculiar composition of carbonatite magma results in some truly
> remarkable properties :
>
> - Extremely fluid consistency, often compared to water
> - Rapid flow rates during eruptions
> - Strange, fountain-like eruption patterns
> - Quick color transformation from dark to white upon cooling
>
> These characteristics create a spectacle unlike any other on Earth.
> Observers have described the lava flows as resembling *jets from a garden
> hose*, a far cry from the slow-moving rivers of molten rock associated with
> typical volcanoes.
>
> The unique chemical composition of Ol Doinyo Lengai?s magma also leads to
> fascinating post-eruption transformations. Initially appearing black or
> dark gray, the lava rapidly turns white as it cools and dries. This color
> change occurs due to the formation of carbonate minerals like calcite,
> which quickly break down when exposed to moisture.
>
>
> https://indiandefencereview.com/rare-magma-discovered-as-volcano-sinks-could-this-lead-to-new-dangers/
>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 9 Nov 2024 20:36:48 -0500
> From: Kreigh Tomaszewski <kreigh at gmail.com>
> To: "Rockhounds at drizzle.com: A mailing list for rock and gem
> collectors" <rockhounds at rockhounds.drizzle.com>
> Subject: Re: [Rockhounds] Mineral Evolution | ROBERT M. HAZEN
> Message-ID:
> <CACibpJ+r20O4DoAF6sqVY2p6g7x2TtWz=VKTTcsJ=
> ZKdguRbPg at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> I have heard Bob lecture on the subject and find his arguments to be quite
> compelling.
>
> On Sat, Nov 9, 2024 at 7:59?PM Jeffrey Joy <jeffreyjoy at gmail.com> wrote:
>
> > Found this fascinating
> >
> > https://hazen.carnegiescience.edu/research/mineral-evolution
> >
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> >
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 10 Nov 2024 16:03:44 +0100 (CET)
> From: axel.emmermann at telenet.be
> To: "Rockhounds at drizzle.com" <rockhounds at rockhounds.drizzle.com>
> Subject: Re: [Rockhounds] Rare Magma Discovered as Volcano Sinks ?
> Could This Lead to New Dangers?
> Message-ID:
> <698724962.2057633.1731251024727.JavaMail.zimbra at telenet.be>
> Content-Type: text/plain; charset=utf-8
>
> and this carbonatite lava is full of rare earth elements... as I mentioned
> a few times earlier ;-)
>
> Axel
>
> ----- Oorspronkelijk bericht -----
> Van: "Kreigh Tomaszewski" <kreigh at gmail.com>
> Aan: "Rockhounds at drizzle.com" <rockhounds at rockhounds.drizzle.com>
> Verzonden: Zondag 10 november 2024 02:24:12
> Onderwerp: [Rockhounds] Rare Magma Discovered as Volcano Sinks ? Could
> This Lead to New Dangers?
>
> Ol Doinyo Lengai stands out among the world?s volcanoes for one
> extraordinary reason : it is the only active volcano known to produce
> carbonatite magma. This rare type of magma has an unusually low silica
> content, typically less than 25%, compared to the 45-70% found in other
> terrestrial magmas.
>
> The peculiar composition of carbonatite magma results in some truly
> remarkable properties :
>
> - Extremely fluid consistency, often compared to water
> - Rapid flow rates during eruptions
> - Strange, fountain-like eruption patterns
> - Quick color transformation from dark to white upon cooling
>
> These characteristics create a spectacle unlike any other on Earth.
> Observers have described the lava flows as resembling *jets from a garden
> hose*, a far cry from the slow-moving rivers of molten rock associated with
> typical volcanoes.
>
> The unique chemical composition of Ol Doinyo Lengai?s magma also leads to
> fascinating post-eruption transformations. Initially appearing black or
> dark gray, the lava rapidly turns white as it cools and dries. This color
> change occurs due to the formation of carbonate minerals like calcite,
> which quickly break down when exposed to moisture.
>
>
> https://indiandefencereview.com/rare-magma-discovered-as-volcano-sinks-could-this-lead-to-new-dangers/
> _______________________________________________
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> --
> Axel Emmermann
> Mineralogische Kring Antwerpen
> Mineralogical Society of Antwerp
> Werkgroep Fluorescerende mineralen
> Workgroup Fluorescent Minerals
> [ http://fluo.mineralogie.be/index.html |
> http://fluo.mineralogie.be/index.html ]
> Bezoek Minerant op 10 & 11 mei 2024
>
>
>
> ------------------------------
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> ------------------------------
>
> End of Rockhounds Digest, Vol 95, Issue 6
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