Garnet crystallization mechanisms and localized polymetamorphism in the southwestern Meguma Terrane, Nova Scotia, Canada
We present data on the pressure and temperature (P–T) conditions experienced by metamorphic rocks of the Meguma Terrane, Nova Scotia, Canada, also utilizing three‐dimensional microstructural data on one sample to better constrain the mechanisms that controlled garnet crystallization. Inverse and for...
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| Veröffentlicht in: | Journal of metamorphic geology 2022-10, Vol.40 (8), p.1383-1404 |
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| container_title | Journal of metamorphic geology |
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| creator | Nagurney, Alexandra B. Caddick, Mark J. White, Chris E. |
| description | We present data on the pressure and temperature (P–T) conditions experienced by metamorphic rocks of the Meguma Terrane, Nova Scotia, Canada, also utilizing three‐dimensional microstructural data on one sample to better constrain the mechanisms that controlled garnet crystallization. Inverse and forward thermodynamic modelling place peak P–T conditions in the southwestern Meguma Terrane at ~650°C and 4.5 kbar. Interpretation of these results with petrographic observations and previous P–T constraints across the terrane suggests that amphibolite facies metamorphism occurred during the Devonian Neoacadian orogeny (406–388 Ma). Integration of quantitative 3D textural data with an estimated metamorphic heating rate of |
| doi_str_mv | 10.1111/jmg.12678 |
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Inverse and forward thermodynamic modelling place peak P–T conditions in the southwestern Meguma Terrane at ~650°C and 4.5 kbar. Interpretation of these results with petrographic observations and previous P–T constraints across the terrane suggests that amphibolite facies metamorphism occurred during the Devonian Neoacadian orogeny (406–388 Ma). Integration of quantitative 3D textural data with an estimated metamorphic heating rate of <5°C/Myr is consistent with amphibolite facies metamorphism resulting from tectonic loading during the Neoacadian orogeny, though the exact nature of the orogeny is still not well understood. Further, the intrusion of granitic plutons into the Meguma metasediments at 373 Ma likely locally drove metamorphic recrystallization (polymetamorphism). The 3D size, shape, and location of garnet crystals in one sample reveal that the rate‐limiting step for garnet crystallization was likely the diffusion of aluminium through the intergranular matrix at length scales less than the mean nearest neighbour distance between garnet crystals. Nucleation was aided by epitaxial overgrowth onto a muscovite substrate, though it appears there may have been a decoupling between minerals providing a substrate and those providing nutrients during garnet growth.</description><identifier>ISSN: 0263-4929</identifier><identifier>EISSN: 1525-1314</identifier><identifier>DOI: 10.1111/jmg.12678</identifier><language>eng</language><publisher>Oxford: Blackwell Publishing Ltd</publisher><subject>Aluminium ; Aluminum ; Amphibolite facies ; Amphibolites ; Appalachian orogen ; crystal growth ; Crystallization ; Crystals ; Decoupling ; Devonian ; Diffusion rate ; Garnet ; Garnets ; Heating rate ; Igneous rocks ; Metamorphic rocks ; Metamorphism ; Metamorphism (geology) ; Mica ; Minerals ; Muscovite ; Nucleation ; Nutrients ; Orogeny ; Plutons ; polymetamorphism ; Recrystallization ; Sedimentary facies ; Substrates ; Tectonics ; Thermodynamic models ; X‐ray CT</subject><ispartof>Journal of metamorphic geology, 2022-10, Vol.40 (8), p.1383-1404</ispartof><rights>2022 John Wiley & Sons Ltd.</rights><rights>2022 John Wiley & Sons Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a1658-aeb7e8c8f97bbe4a145d5854e0c0b0fd1cf9ba3ac3a84e5edb22db0e84c506473</citedby><cites>FETCH-LOGICAL-a1658-aeb7e8c8f97bbe4a145d5854e0c0b0fd1cf9ba3ac3a84e5edb22db0e84c506473</cites><orcidid>0000-0001-8795-8438 ; 0000-0003-3633-3256</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Fjmg.12678$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fjmg.12678$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids></links><search><creatorcontrib>Nagurney, Alexandra B.</creatorcontrib><creatorcontrib>Caddick, Mark J.</creatorcontrib><creatorcontrib>White, Chris E.</creatorcontrib><title>Garnet crystallization mechanisms and localized polymetamorphism in the southwestern Meguma Terrane, Nova Scotia, Canada</title><title>Journal of metamorphic geology</title><description>We present data on the pressure and temperature (P–T) conditions experienced by metamorphic rocks of the Meguma Terrane, Nova Scotia, Canada, also utilizing three‐dimensional microstructural data on one sample to better constrain the mechanisms that controlled garnet crystallization. Inverse and forward thermodynamic modelling place peak P–T conditions in the southwestern Meguma Terrane at ~650°C and 4.5 kbar. Interpretation of these results with petrographic observations and previous P–T constraints across the terrane suggests that amphibolite facies metamorphism occurred during the Devonian Neoacadian orogeny (406–388 Ma). Integration of quantitative 3D textural data with an estimated metamorphic heating rate of <5°C/Myr is consistent with amphibolite facies metamorphism resulting from tectonic loading during the Neoacadian orogeny, though the exact nature of the orogeny is still not well understood. Further, the intrusion of granitic plutons into the Meguma metasediments at 373 Ma likely locally drove metamorphic recrystallization (polymetamorphism). The 3D size, shape, and location of garnet crystals in one sample reveal that the rate‐limiting step for garnet crystallization was likely the diffusion of aluminium through the intergranular matrix at length scales less than the mean nearest neighbour distance between garnet crystals. Nucleation was aided by epitaxial overgrowth onto a muscovite substrate, though it appears there may have been a decoupling between minerals providing a substrate and those providing nutrients during garnet growth.</description><subject>Aluminium</subject><subject>Aluminum</subject><subject>Amphibolite facies</subject><subject>Amphibolites</subject><subject>Appalachian orogen</subject><subject>crystal growth</subject><subject>Crystallization</subject><subject>Crystals</subject><subject>Decoupling</subject><subject>Devonian</subject><subject>Diffusion rate</subject><subject>Garnet</subject><subject>Garnets</subject><subject>Heating rate</subject><subject>Igneous rocks</subject><subject>Metamorphic rocks</subject><subject>Metamorphism</subject><subject>Metamorphism (geology)</subject><subject>Mica</subject><subject>Minerals</subject><subject>Muscovite</subject><subject>Nucleation</subject><subject>Nutrients</subject><subject>Orogeny</subject><subject>Plutons</subject><subject>polymetamorphism</subject><subject>Recrystallization</subject><subject>Sedimentary facies</subject><subject>Substrates</subject><subject>Tectonics</subject><subject>Thermodynamic models</subject><subject>X‐ray CT</subject><issn>0263-4929</issn><issn>1525-1314</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp1kD1PwzAQhi0EEqUw8A8sMSE1rZ3YiTOiCgqowECZo4tzaVIldrFTSvn1BMLKLTe8z33oIeSSsynva7Zp11Mexok6IiMuQxnwiItjMmJhHAUiDdNTcub9hjEehZEYkc8FOIMd1e7gO2ia-gu62hraoq7A1L71FExBG6uhz7CgW9scWuygtW5b9TmtDe0qpN7uumqPvkNn6BOudy3QFToHBif02X4AfdW2q2FC52CggHNyUkLj8eKvj8nb3e1qfh8sXxYP85tlADyWKgDME1RalWmS5yiAC1lIJQUyzXJWFlyXaQ4R6AiUQIlFHoZFzlAJLVkskmhMroa9W2ffd_1_2cbunOlPZmHClJJxKtKeuh4o7az3Dsts6-oW3CHjLPsRm_Vis1-xPTsb2H3d4OF_MHt8WgwT33utfTY</recordid><startdate>202210</startdate><enddate>202210</enddate><creator>Nagurney, Alexandra B.</creator><creator>Caddick, Mark J.</creator><creator>White, Chris E.</creator><general>Blackwell Publishing Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0001-8795-8438</orcidid><orcidid>https://orcid.org/0000-0003-3633-3256</orcidid></search><sort><creationdate>202210</creationdate><title>Garnet crystallization mechanisms and localized polymetamorphism in the southwestern Meguma Terrane, Nova Scotia, Canada</title><author>Nagurney, Alexandra B. ; Caddick, Mark J. ; White, Chris E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a1658-aeb7e8c8f97bbe4a145d5854e0c0b0fd1cf9ba3ac3a84e5edb22db0e84c506473</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Aluminium</topic><topic>Aluminum</topic><topic>Amphibolite facies</topic><topic>Amphibolites</topic><topic>Appalachian orogen</topic><topic>crystal growth</topic><topic>Crystallization</topic><topic>Crystals</topic><topic>Decoupling</topic><topic>Devonian</topic><topic>Diffusion rate</topic><topic>Garnet</topic><topic>Garnets</topic><topic>Heating rate</topic><topic>Igneous rocks</topic><topic>Metamorphic rocks</topic><topic>Metamorphism</topic><topic>Metamorphism (geology)</topic><topic>Mica</topic><topic>Minerals</topic><topic>Muscovite</topic><topic>Nucleation</topic><topic>Nutrients</topic><topic>Orogeny</topic><topic>Plutons</topic><topic>polymetamorphism</topic><topic>Recrystallization</topic><topic>Sedimentary facies</topic><topic>Substrates</topic><topic>Tectonics</topic><topic>Thermodynamic models</topic><topic>X‐ray CT</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nagurney, Alexandra B.</creatorcontrib><creatorcontrib>Caddick, Mark J.</creatorcontrib><creatorcontrib>White, Chris E.</creatorcontrib><collection>CrossRef</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Journal of metamorphic geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nagurney, Alexandra B.</au><au>Caddick, Mark J.</au><au>White, Chris E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Garnet crystallization mechanisms and localized polymetamorphism in the southwestern Meguma Terrane, Nova Scotia, Canada</atitle><jtitle>Journal of metamorphic geology</jtitle><date>2022-10</date><risdate>2022</risdate><volume>40</volume><issue>8</issue><spage>1383</spage><epage>1404</epage><pages>1383-1404</pages><issn>0263-4929</issn><eissn>1525-1314</eissn><abstract>We present data on the pressure and temperature (P–T) conditions experienced by metamorphic rocks of the Meguma Terrane, Nova Scotia, Canada, also utilizing three‐dimensional microstructural data on one sample to better constrain the mechanisms that controlled garnet crystallization. Inverse and forward thermodynamic modelling place peak P–T conditions in the southwestern Meguma Terrane at ~650°C and 4.5 kbar. Interpretation of these results with petrographic observations and previous P–T constraints across the terrane suggests that amphibolite facies metamorphism occurred during the Devonian Neoacadian orogeny (406–388 Ma). Integration of quantitative 3D textural data with an estimated metamorphic heating rate of <5°C/Myr is consistent with amphibolite facies metamorphism resulting from tectonic loading during the Neoacadian orogeny, though the exact nature of the orogeny is still not well understood. Further, the intrusion of granitic plutons into the Meguma metasediments at 373 Ma likely locally drove metamorphic recrystallization (polymetamorphism). The 3D size, shape, and location of garnet crystals in one sample reveal that the rate‐limiting step for garnet crystallization was likely the diffusion of aluminium through the intergranular matrix at length scales less than the mean nearest neighbour distance between garnet crystals. Nucleation was aided by epitaxial overgrowth onto a muscovite substrate, though it appears there may have been a decoupling between minerals providing a substrate and those providing nutrients during garnet growth.</abstract><cop>Oxford</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/jmg.12678</doi><tpages>22</tpages><orcidid>https://orcid.org/0000-0001-8795-8438</orcidid><orcidid>https://orcid.org/0000-0003-3633-3256</orcidid></addata></record> |
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| subjects | Aluminium Aluminum Amphibolite facies Amphibolites Appalachian orogen crystal growth Crystallization Crystals Decoupling Devonian Diffusion rate Garnet Garnets Heating rate Igneous rocks Metamorphic rocks Metamorphism Metamorphism (geology) Mica Minerals Muscovite Nucleation Nutrients Orogeny Plutons polymetamorphism Recrystallization Sedimentary facies Substrates Tectonics Thermodynamic models X‐ray CT |
| title | Garnet crystallization mechanisms and localized polymetamorphism in the southwestern Meguma Terrane, Nova Scotia, Canada |
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