The Contribution of Volume Change in Preserving High‐P Metastable Assemblages.
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| Title: | The Contribution of Volume Change in Preserving High‐P Metastable Assemblages. |
|---|---|
| Authors: | Chapman, Timothy1 (AUTHOR) timothy.chapman@une.edu.au, Clarke, Geoffrey L.2 (AUTHOR), Piazolo, Sandra3 (AUTHOR) |
| Source: | Journal of Metamorphic Geology. Apr2026, Vol. 44 Issue 3, p177-199. 23p. |
| Subject Terms: | *Pyroxene, *Albite, *Metamorphism (Geology), *Minerals, *Recrystallization (Metallurgy), *Tectonic exhumation |
| Geographic Terms: | New Caledonia |
| Abstract: | Incomplete retrograde reaction of sodic–calcic pyroxene occurred during the exhumation of Eocene eclogite and blueschist in NE New Caledonia. Sodic–calcic pyroxene is well‐preserved in reaction relationships with paragonite and structurally late albite, in conflict with the prediction that it should transform efficiently during decompression to albite, paragonite, glaucophane and quartz. The microstructural distribution of albite accompanying crenulation cleavage development is consistent with albite growth having been restricted by space‐filling requirements. In contrast, domains of high strain enable the accommodation of volume and fluid infiltration, increasing the size of the equilibration volume leading to the complete conversion of sodic–calcic clinopyroxene to albite. Despite decompression‐driven dehydration, limited volume accommodation presents a plausible mechanism to metastably preserve high‐P (up to 18 kbar) sodic–calcic clinopyroxene‐bearing assemblages to lower‐P conditions (~10 kbar) that should stabilise albite. Efficient retrogression is facilitated by dynamic recrystallisation inducing dilation. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 192092287 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The Contribution of Volume Change in Preserving High‐P Metastable Assemblages. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Chapman%2C+Timothy%22">Chapman, Timothy</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> timothy.chapman@une.edu.au</i><br /><searchLink fieldCode="AR" term="%22Clarke%2C+Geoffrey L%2E%22">Clarke, Geoffrey L.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Piazolo%2C+Sandra%22">Piazolo, Sandra</searchLink><relatesTo>3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Metamorphic+Geology%22">Journal of Metamorphic Geology</searchLink>. Apr2026, Vol. 44 Issue 3, p177-199. 23p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Pyroxene%22">Pyroxene</searchLink><br />*<searchLink fieldCode="DE" term="%22Albite%22">Albite</searchLink><br />*<searchLink fieldCode="DE" term="%22Metamorphism+%28Geology%29%22">Metamorphism (Geology)</searchLink><br />*<searchLink fieldCode="DE" term="%22Minerals%22">Minerals</searchLink><br />*<searchLink fieldCode="DE" term="%22Recrystallization+%28Metallurgy%29%22">Recrystallization (Metallurgy)</searchLink><br />*<searchLink fieldCode="DE" term="%22Tectonic+exhumation%22">Tectonic exhumation</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22New+Caledonia%22">New Caledonia</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Incomplete retrograde reaction of sodic–calcic pyroxene occurred during the exhumation of Eocene eclogite and blueschist in NE New Caledonia. Sodic–calcic pyroxene is well‐preserved in reaction relationships with paragonite and structurally late albite, in conflict with the prediction that it should transform efficiently during decompression to albite, paragonite, glaucophane and quartz. The microstructural distribution of albite accompanying crenulation cleavage development is consistent with albite growth having been restricted by space‐filling requirements. In contrast, domains of high strain enable the accommodation of volume and fluid infiltration, increasing the size of the equilibration volume leading to the complete conversion of sodic–calcic clinopyroxene to albite. Despite decompression‐driven dehydration, limited volume accommodation presents a plausible mechanism to metastably preserve high‐P (up to 18 kbar) sodic–calcic clinopyroxene‐bearing assemblages to lower‐P conditions (~10 kbar) that should stabilise albite. Efficient retrogression is facilitated by dynamic recrystallisation inducing dilation. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/jmg.70028 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 23 StartPage: 177 Subjects: – SubjectFull: Pyroxene Type: general – SubjectFull: Albite Type: general – SubjectFull: Metamorphism (Geology) Type: general – SubjectFull: Minerals Type: general – SubjectFull: Recrystallization (Metallurgy) Type: general – SubjectFull: Tectonic exhumation Type: general – SubjectFull: New Caledonia Type: general Titles: – TitleFull: The Contribution of Volume Change in Preserving High‐P Metastable Assemblages. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Chapman, Timothy – PersonEntity: Name: NameFull: Clarke, Geoffrey L. – PersonEntity: Name: NameFull: Piazolo, Sandra IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 02634929 Numbering: – Type: volume Value: 44 – Type: issue Value: 3 Titles: – TitleFull: Journal of Metamorphic Geology Type: main |
| ResultId | 1 |
