Consistent garnet Lu–Hf and Sm–Nd ages indicate short‐lived high‐pressure metamorphism and rapid subduction in oceanic subduction belt: An example from the Changning–Menglian orogenic belt, southeastern Tibetan Plateau
The integration of garnet‐based petrologic constraints with multimineral geochronologic data in eclogites and blueschists allows the timing and rate of subduction zone metamorphism to be constrained. We present a combined garnet Lu–Hf/Sm–Nd and zircon/rutile U–Pb geochronology study on three eclogit...
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description | The integration of garnet‐based petrologic constraints with multimineral geochronologic data in eclogites and blueschists allows the timing and rate of subduction zone metamorphism to be constrained. We present a combined garnet Lu–Hf/Sm–Nd and zircon/rutile U–Pb geochronology study on three eclogites, a garnet‐bearing blueschist, and a micaschist from the Changning–Menglian orogenic belt, a newly discovered ultrahigh‐pressure metamorphic belt in southeast Tibet, in order to characterize tectono‐metamorphic events and determine the duration of Paleo‐Tethys oceanic subduction. Integration of phase equilibrium modelling and conventional thermobarometry for the eclogites defines a clockwise P–T path evolving from blueschist facies conditions at ~1.4 GPa and ~505–530°C to peak eclogite facies conditions at ~2.8 GPa and ~630–640°C, followed by isothermal decompression to amphibolite facies at ~1.0 GPa and ~630–650°C. The Lu–Hf ages of c. 239–236 Ma obtained for the eclogites and the blueschist are indistinguishable from the rutile U–Pb age of c. 239 Ma obtained for the eclogites and, combined with the observation of well‐preserved Rayleigh‐fractionation‐style Mn and Lu zoning profiles in garnet, reflect the timing of early prograde garnet growth. The Sm–Nd ages of c. 242–236 Ma reflect a later period of garnet growth, evidenced by flat and/or M‐shaped Sm zoning profiles. Each of the Sm–Nd ages overlaps, within uncertainty, with its corresponding Lu–Hf age (i.e., from the same garnet fraction). The consistency of the Lu–Hf and Sm–Nd ages indicates a short overall duration of garnet growth from blueschist to eclogite facies metamorphism, reflecting rapid subduction of the oceanic slab. The magmatic zircon U–Pb dates of c. 247 Ma constrain the protolith age of these metabasaltic rocks. The close protolith and the high‐pressure metamorphic ages, together with the consistent garnet Lu–Hf and Sm–Nd ages and the overlapping youngest and oldest metamorphic ages of the oceanic‐type and continental‐type eclogites, respectively, suggest a fast tectonic transition from divergence to convergence highlighted by rapid oceanic subduction, continuous transition from oceanic to continental subduction, and a rapid cooling of the subduction interface. |
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We present a combined garnet Lu–Hf/Sm–Nd and zircon/rutile U–Pb geochronology study on three eclogites, a garnet‐bearing blueschist, and a micaschist from the Changning–Menglian orogenic belt, a newly discovered ultrahigh‐pressure metamorphic belt in southeast Tibet, in order to characterize tectono‐metamorphic events and determine the duration of Paleo‐Tethys oceanic subduction. Integration of phase equilibrium modelling and conventional thermobarometry for the eclogites defines a clockwise P–T path evolving from blueschist facies conditions at ~1.4 GPa and ~505–530°C to peak eclogite facies conditions at ~2.8 GPa and ~630–640°C, followed by isothermal decompression to amphibolite facies at ~1.0 GPa and ~630–650°C. The Lu–Hf ages of c. 239–236 Ma obtained for the eclogites and the blueschist are indistinguishable from the rutile U–Pb age of c. 239 Ma obtained for the eclogites and, combined with the observation of well‐preserved Rayleigh‐fractionation‐style Mn and Lu zoning profiles in garnet, reflect the timing of early prograde garnet growth. The Sm–Nd ages of c. 242–236 Ma reflect a later period of garnet growth, evidenced by flat and/or M‐shaped Sm zoning profiles. Each of the Sm–Nd ages overlaps, within uncertainty, with its corresponding Lu–Hf age (i.e., from the same garnet fraction). The consistency of the Lu–Hf and Sm–Nd ages indicates a short overall duration of garnet growth from blueschist to eclogite facies metamorphism, reflecting rapid subduction of the oceanic slab. The magmatic zircon U–Pb dates of c. 247 Ma constrain the protolith age of these metabasaltic rocks. The close protolith and the high‐pressure metamorphic ages, together with the consistent garnet Lu–Hf and Sm–Nd ages and the overlapping youngest and oldest metamorphic ages of the oceanic‐type and continental‐type eclogites, respectively, suggest a fast tectonic transition from divergence to convergence highlighted by rapid oceanic subduction, continuous transition from oceanic to continental subduction, and a rapid cooling of the subduction interface.</description><identifier>ISSN: 0263-4929</identifier><identifier>EISSN: 1525-1314</identifier><identifier>DOI: 10.1111/jmg.12735</identifier><language>eng</language><publisher>Oxford: Blackwell Publishing Ltd</publisher><subject>Age ; Amphibolite facies ; Amphibolites ; Belts ; Chronostratigraphy ; Constraints ; Decompression ; Eclogite ; Fractionation ; Garnet ; Garnets ; Geochronology ; Geochronometry ; Growth ; Lead ; Lu–Hf ; Manganese ; Metamorphism ; Metamorphism (geology) ; Orogeny ; Paleoceanography ; Phase equilibria ; Pressure ; Radiometric dating ; Rutile ; Sm–Nd ; Subduction ; Subduction (geology) ; Subduction zones ; Tectonics ; Tibet ; Zircon ; Zoning</subject><ispartof>Journal of metamorphic geology, 2023-10, Vol.41 (8), p.1031-1047</ispartof><rights>2023 John Wiley & Sons Ltd.</rights><rights>2023 John Wiley & Sons Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3205-2cfd288e62c943c0a91c859b9178c8815e8fb79a592fe9c8561189ed408819ad3</citedby><cites>FETCH-LOGICAL-a3205-2cfd288e62c943c0a91c859b9178c8815e8fb79a592fe9c8561189ed408819ad3</cites><orcidid>0000-0003-3460-389X ; 0000-0001-5331-5725</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.12735$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fjmg.12735$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids></links><search><creatorcontrib>Zhou, Ying</creatorcontrib><creatorcontrib>Cheng, Hao</creatorcontrib><creatorcontrib>Peng, Zhi‐min</creatorcontrib><creatorcontrib>Dragovic, Besim</creatorcontrib><creatorcontrib>Fu, Yu‐zhen</creatorcontrib><creatorcontrib>Du, Kai‐Yang</creatorcontrib><title>Consistent garnet Lu–Hf and Sm–Nd ages indicate short‐lived high‐pressure metamorphism and rapid subduction in oceanic subduction belt: An example from the Changning–Menglian orogenic belt, southeastern Tibetan Plateau</title><title>Journal of metamorphic geology</title><description>The integration of garnet‐based petrologic constraints with multimineral geochronologic data in eclogites and blueschists allows the timing and rate of subduction zone metamorphism to be constrained. We present a combined garnet Lu–Hf/Sm–Nd and zircon/rutile U–Pb geochronology study on three eclogites, a garnet‐bearing blueschist, and a micaschist from the Changning–Menglian orogenic belt, a newly discovered ultrahigh‐pressure metamorphic belt in southeast Tibet, in order to characterize tectono‐metamorphic events and determine the duration of Paleo‐Tethys oceanic subduction. Integration of phase equilibrium modelling and conventional thermobarometry for the eclogites defines a clockwise P–T path evolving from blueschist facies conditions at ~1.4 GPa and ~505–530°C to peak eclogite facies conditions at ~2.8 GPa and ~630–640°C, followed by isothermal decompression to amphibolite facies at ~1.0 GPa and ~630–650°C. The Lu–Hf ages of c. 239–236 Ma obtained for the eclogites and the blueschist are indistinguishable from the rutile U–Pb age of c. 239 Ma obtained for the eclogites and, combined with the observation of well‐preserved Rayleigh‐fractionation‐style Mn and Lu zoning profiles in garnet, reflect the timing of early prograde garnet growth. The Sm–Nd ages of c. 242–236 Ma reflect a later period of garnet growth, evidenced by flat and/or M‐shaped Sm zoning profiles. Each of the Sm–Nd ages overlaps, within uncertainty, with its corresponding Lu–Hf age (i.e., from the same garnet fraction). The consistency of the Lu–Hf and Sm–Nd ages indicates a short overall duration of garnet growth from blueschist to eclogite facies metamorphism, reflecting rapid subduction of the oceanic slab. The magmatic zircon U–Pb dates of c. 247 Ma constrain the protolith age of these metabasaltic rocks. The close protolith and the high‐pressure metamorphic ages, together with the consistent garnet Lu–Hf and Sm–Nd ages and the overlapping youngest and oldest metamorphic ages of the oceanic‐type and continental‐type eclogites, respectively, suggest a fast tectonic transition from divergence to convergence highlighted by rapid oceanic subduction, continuous transition from oceanic to continental subduction, and a rapid cooling of the subduction interface.</description><subject>Age</subject><subject>Amphibolite facies</subject><subject>Amphibolites</subject><subject>Belts</subject><subject>Chronostratigraphy</subject><subject>Constraints</subject><subject>Decompression</subject><subject>Eclogite</subject><subject>Fractionation</subject><subject>Garnet</subject><subject>Garnets</subject><subject>Geochronology</subject><subject>Geochronometry</subject><subject>Growth</subject><subject>Lead</subject><subject>Lu–Hf</subject><subject>Manganese</subject><subject>Metamorphism</subject><subject>Metamorphism (geology)</subject><subject>Orogeny</subject><subject>Paleoceanography</subject><subject>Phase equilibria</subject><subject>Pressure</subject><subject>Radiometric dating</subject><subject>Rutile</subject><subject>Sm–Nd</subject><subject>Subduction</subject><subject>Subduction (geology)</subject><subject>Subduction zones</subject><subject>Tectonics</subject><subject>Tibet</subject><subject>Zircon</subject><subject>Zoning</subject><issn>0263-4929</issn><issn>1525-1314</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNp1kcFu1DAQhi0EEkvhwBuMxAmJtLGT7MbcqhW0oC0gUc7RxJ4kXiV2sB2gtz4CEm9Y8SB4uxy44Is9nm9-_9bP2HOen_K0zvZTf8rFpqgesBWvRJXxgpcP2SoX6yIrpZCP2ZMQ9nnOC1GUK_Z762wwIZKN0KO3FGG33N3-uuwArYbPUzp_0IA9BTBWG4WRIAzOx7vbn6P5RhoG0w-pmD2FsHiCiSJOzs-DCdO9iMfZaAhLqxcVjbNJCJwitEb9e9vSGF_DuQX6gdM8EnTeTRAHgu2AtrfG9snMFdl-NJgUvOvpIHGYewXBLQnF9BNv4dq0yYSFT2Oyi8tT9qjDMdCzv_sJ-_L2zfX2Mtt9vHi3Pd9lWIi8yoTqtKhrWgsly0LlKLmqK9lKvqlVXfOK6q7dSKyk6Eim1przWpIu89SUqIsT9uKoO3v3daEQm71bvE1PNiIJVaWUZZ2ol0dKeReCp66ZvZnQ3zQ8bw4hNinE5j7ExJ4d2e9mpJv_g837q4vjxB8im6gT</recordid><startdate>202310</startdate><enddate>202310</enddate><creator>Zhou, Ying</creator><creator>Cheng, Hao</creator><creator>Peng, Zhi‐min</creator><creator>Dragovic, Besim</creator><creator>Fu, Yu‐zhen</creator><creator>Du, Kai‐Yang</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/0000-0003-3460-389X</orcidid><orcidid>https://orcid.org/0000-0001-5331-5725</orcidid></search><sort><creationdate>202310</creationdate><title>Consistent garnet Lu–Hf and Sm–Nd ages indicate short‐lived high‐pressure metamorphism and rapid subduction in oceanic subduction belt: An example from the Changning–Menglian orogenic belt, southeastern Tibetan Plateau</title><author>Zhou, Ying ; Cheng, Hao ; Peng, Zhi‐min ; Dragovic, Besim ; Fu, Yu‐zhen ; Du, Kai‐Yang</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3205-2cfd288e62c943c0a91c859b9178c8815e8fb79a592fe9c8561189ed408819ad3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Age</topic><topic>Amphibolite facies</topic><topic>Amphibolites</topic><topic>Belts</topic><topic>Chronostratigraphy</topic><topic>Constraints</topic><topic>Decompression</topic><topic>Eclogite</topic><topic>Fractionation</topic><topic>Garnet</topic><topic>Garnets</topic><topic>Geochronology</topic><topic>Geochronometry</topic><topic>Growth</topic><topic>Lead</topic><topic>Lu–Hf</topic><topic>Manganese</topic><topic>Metamorphism</topic><topic>Metamorphism (geology)</topic><topic>Orogeny</topic><topic>Paleoceanography</topic><topic>Phase equilibria</topic><topic>Pressure</topic><topic>Radiometric dating</topic><topic>Rutile</topic><topic>Sm–Nd</topic><topic>Subduction</topic><topic>Subduction (geology)</topic><topic>Subduction zones</topic><topic>Tectonics</topic><topic>Tibet</topic><topic>Zircon</topic><topic>Zoning</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhou, Ying</creatorcontrib><creatorcontrib>Cheng, Hao</creatorcontrib><creatorcontrib>Peng, Zhi‐min</creatorcontrib><creatorcontrib>Dragovic, Besim</creatorcontrib><creatorcontrib>Fu, Yu‐zhen</creatorcontrib><creatorcontrib>Du, Kai‐Yang</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>Zhou, Ying</au><au>Cheng, Hao</au><au>Peng, Zhi‐min</au><au>Dragovic, Besim</au><au>Fu, Yu‐zhen</au><au>Du, Kai‐Yang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Consistent garnet Lu–Hf and Sm–Nd ages indicate short‐lived high‐pressure metamorphism and rapid subduction in oceanic subduction belt: An example from the Changning–Menglian orogenic belt, southeastern Tibetan Plateau</atitle><jtitle>Journal of metamorphic geology</jtitle><date>2023-10</date><risdate>2023</risdate><volume>41</volume><issue>8</issue><spage>1031</spage><epage>1047</epage><pages>1031-1047</pages><issn>0263-4929</issn><eissn>1525-1314</eissn><abstract>The integration of garnet‐based petrologic constraints with multimineral geochronologic data in eclogites and blueschists allows the timing and rate of subduction zone metamorphism to be constrained. We present a combined garnet Lu–Hf/Sm–Nd and zircon/rutile U–Pb geochronology study on three eclogites, a garnet‐bearing blueschist, and a micaschist from the Changning–Menglian orogenic belt, a newly discovered ultrahigh‐pressure metamorphic belt in southeast Tibet, in order to characterize tectono‐metamorphic events and determine the duration of Paleo‐Tethys oceanic subduction. Integration of phase equilibrium modelling and conventional thermobarometry for the eclogites defines a clockwise P–T path evolving from blueschist facies conditions at ~1.4 GPa and ~505–530°C to peak eclogite facies conditions at ~2.8 GPa and ~630–640°C, followed by isothermal decompression to amphibolite facies at ~1.0 GPa and ~630–650°C. The Lu–Hf ages of c. 239–236 Ma obtained for the eclogites and the blueschist are indistinguishable from the rutile U–Pb age of c. 239 Ma obtained for the eclogites and, combined with the observation of well‐preserved Rayleigh‐fractionation‐style Mn and Lu zoning profiles in garnet, reflect the timing of early prograde garnet growth. The Sm–Nd ages of c. 242–236 Ma reflect a later period of garnet growth, evidenced by flat and/or M‐shaped Sm zoning profiles. Each of the Sm–Nd ages overlaps, within uncertainty, with its corresponding Lu–Hf age (i.e., from the same garnet fraction). The consistency of the Lu–Hf and Sm–Nd ages indicates a short overall duration of garnet growth from blueschist to eclogite facies metamorphism, reflecting rapid subduction of the oceanic slab. The magmatic zircon U–Pb dates of c. 247 Ma constrain the protolith age of these metabasaltic rocks. The close protolith and the high‐pressure metamorphic ages, together with the consistent garnet Lu–Hf and Sm–Nd ages and the overlapping youngest and oldest metamorphic ages of the oceanic‐type and continental‐type eclogites, respectively, suggest a fast tectonic transition from divergence to convergence highlighted by rapid oceanic subduction, continuous transition from oceanic to continental subduction, and a rapid cooling of the subduction interface.</abstract><cop>Oxford</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/jmg.12735</doi><tpages>17</tpages><orcidid>https://orcid.org/0000-0003-3460-389X</orcidid><orcidid>https://orcid.org/0000-0001-5331-5725</orcidid></addata></record> |
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subjects | Age Amphibolite facies Amphibolites Belts Chronostratigraphy Constraints Decompression Eclogite Fractionation Garnet Garnets Geochronology Geochronometry Growth Lead Lu–Hf Manganese Metamorphism Metamorphism (geology) Orogeny Paleoceanography Phase equilibria Pressure Radiometric dating Rutile Sm–Nd Subduction Subduction (geology) Subduction zones Tectonics Tibet Zircon Zoning |
title | Consistent garnet Lu–Hf and Sm–Nd ages indicate short‐lived high‐pressure metamorphism and rapid subduction in oceanic subduction belt: An example from the Changning–Menglian orogenic belt, southeastern Tibetan Plateau |
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