Petrogenesis of mantle peridotites in Neo‐Tethyan ophiolites from the Eastern Himalaya and Indo‐Myanmar Orogenic Belt in the geo‐tectonic framework of Southeast Asia
The Neo‐Tethyan ophiolites of the Tuting‐Tidding Suture Zone (TTSZ), Eastern Himalaya (viz., Tidding Ophiolite Complex and Mayodia Ophiolite Complex) and Indo‐Myanmar Orogenic Belt (IMOB, i.e., Nagaland Ophiolite Complex and Manipur Ophiolite Complex) which lie along the southern extension of the In...
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| Veröffentlicht in: | Geological journal (Chichester, England) England), 2022-12, Vol.57 (12), p.4886-4919 |
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| description | The Neo‐Tethyan ophiolites of the Tuting‐Tidding Suture Zone (TTSZ), Eastern Himalaya (viz., Tidding Ophiolite Complex and Mayodia Ophiolite Complex) and Indo‐Myanmar Orogenic Belt (IMOB, i.e., Nagaland Ophiolite Complex and Manipur Ophiolite Complex) which lie along the southern extension of the Indus‐Tsangpo Suture Zone have been collectively investigated through the mantle‐derived peridotite sequence. The peridotites (harzburgite and dunites) in the Eastern Himalaya ophiolites are refractory, constrained by the high Fo olivine content (~95), high Cr# [Cr/(Cr + Al)] (0.90–0.99), as well as by the parental melt composition of Cr‐spinels (Al2O3 melt = 3.05–7.55 wt%, FeO/MgO = 0.69–6.46). They have slightly “U‐shaped” chondrite‐normalized Rare Earth Elements (REE) patterns with slight enrichment in Light Rare Earth Elements (LREE) relative to the patterns expected for residues of partial melting, thereby indicating a reaction with the LREE‐enriched melt. These peridotites represent residual portions of a depleted/enriched mantle that underwent partial melting up to 23% in the nascent forearc of an intra‐oceanic subduction zone, and later metasomatized by high‐temperature silicate melts and low‐temperature hydrous fluids. They are composed of a very refractory olivine‐spinel assemblage (Fo: 91.68–96.44; Cr#: 0.90–0.99), corroborating a boninitic parentage, with influence from melt‐rock interactions. In the case of the IMOB ophiolites, a wide range of chemical compositions is observed in the mantle sequence. Lherzolites display low Cr# (0.12–0.26) and TiO2 ( |
| doi_str_mv | 10.1002/gj.4629 |
| format | Article |
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The mantle peridotites of the Neo‐Tethyan ophiolites of the Tuting‐Tidding Suture Zone, Eastern Himalaya, and Indo‐Myanmar Orogenic Belt, Northeast India underwent multiple episodes of partial melting, depletion, enrichment, and refertilization processes during the evolution of the Tethyan oceanic lithosphere at a tectonic setting that changed in time from a mid‐oceanic ridge to a forearc spreading setting. Comprehensive new mineral chemistry and geochemistry data of mantle peridotites from these two orogenic belts, in concurrence with petrography and field evidence, clearly suggest pre‐subduction origin (MOR) of a minor portion of the ophiolite section and subduction origin (SSZ) of major portions of the ophiolite sections.</description><identifier>ISSN: 0072-1050</identifier><identifier>EISSN: 1099-1034</identifier><identifier>DOI: 10.1002/gj.4629</identifier><language>eng</language><publisher>Hoboken, USA: John Wiley & Sons, Inc</publisher><subject>Aluminum oxide ; Belts ; Chemical composition ; Depletion ; Dunite ; Earth mantle ; Eastern Himalaya ; Enrichment ; Fertility ; Fluids ; geochemistry ; Indo‐Myanmar Orogenic Belt ; Isotopes ; Magnesium ; mantle peridotite ; Melting ; mineral chemistry ; Multistage melting ; Northeast India ; Olivine ; Ophiolites ; Orogeny ; Peridotite ; Petrogenesis ; Rare earth elements ; Rocks ; Sequencing ; Silicates ; Spinel ; Subduction ; Subduction (geology) ; Subduction zones ; Tectonics ; Temperature ; Titanium dioxide ; Trace elements</subject><ispartof>Geological journal (Chichester, England), 2022-12, Vol.57 (12), p.4886-4919</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-c2899-50ad4412aedec524d537afb5196be0f53ac753e2b9b57b6fadc3e8b1cac63e2f3</citedby><cites>FETCH-LOGICAL-c2899-50ad4412aedec524d537afb5196be0f53ac753e2b9b57b6fadc3e8b1cac63e2f3</cites><orcidid>0000-0003-1530-195X ; 0000-0002-5362-4496 ; 0000-0001-8379-9097</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fgj.4629$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fgj.4629$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids></links><search><creatorcontrib>Singh, Athokpam Krishnakanta</creatorcontrib><creatorcontrib>Chung, Sun‐Lin</creatorcontrib><creatorcontrib>Somerville, Ian D.</creatorcontrib><title>Petrogenesis of mantle peridotites in Neo‐Tethyan ophiolites from the Eastern Himalaya and Indo‐Myanmar Orogenic Belt in the geo‐tectonic framework of Southeast Asia</title><title>Geological journal (Chichester, England)</title><description>The Neo‐Tethyan ophiolites of the Tuting‐Tidding Suture Zone (TTSZ), Eastern Himalaya (viz., Tidding Ophiolite Complex and Mayodia Ophiolite Complex) and Indo‐Myanmar Orogenic Belt (IMOB, i.e., Nagaland Ophiolite Complex and Manipur Ophiolite Complex) which lie along the southern extension of the Indus‐Tsangpo Suture Zone have been collectively investigated through the mantle‐derived peridotite sequence. The peridotites (harzburgite and dunites) in the Eastern Himalaya ophiolites are refractory, constrained by the high Fo olivine content (~95), high Cr# [Cr/(Cr + Al)] (0.90–0.99), as well as by the parental melt composition of Cr‐spinels (Al2O3 melt = 3.05–7.55 wt%, FeO/MgO = 0.69–6.46). They have slightly “U‐shaped” chondrite‐normalized Rare Earth Elements (REE) patterns with slight enrichment in Light Rare Earth Elements (LREE) relative to the patterns expected for residues of partial melting, thereby indicating a reaction with the LREE‐enriched melt. These peridotites represent residual portions of a depleted/enriched mantle that underwent partial melting up to 23% in the nascent forearc of an intra‐oceanic subduction zone, and later metasomatized by high‐temperature silicate melts and low‐temperature hydrous fluids. They are composed of a very refractory olivine‐spinel assemblage (Fo: 91.68–96.44; Cr#: 0.90–0.99), corroborating a boninitic parentage, with influence from melt‐rock interactions. In the case of the IMOB ophiolites, a wide range of chemical compositions is observed in the mantle sequence. Lherzolites display low Cr# (0.12–0.26) and TiO2 (<0.11) associated with high Mg# [Mg/(Mg + Fet)] (0.69–0.76) in the Cr‐spinels present in them. They represent the residual product of a fertile mantle that underwent low‐degree partial melting (2%–10%) in a divergent mid‐ocean ridge (MOR) tectonic setting. On the other hand, the harzburgites and dunites of the IMOB have high Cr# (0.84–0.90) and low TiO2 (<0.06 wt%) Cr‐spinels and exhibit slightly U‐shaped REE distributions indicating their derivation from a highly depleted mantle source, which experienced higher degree partial melting (17%–24%) similar to those of supra‐subduction zone (SSZ) harzburgites and dunites of the TTSZ peridotites. The occurrence of both MOR and SSZ types of melting regimes indicates that the peridotites in the IMOB ophiolites formed at two major different stages of the pre‐subduction and subduction events, respectively. However, the peridotites of Eastern Himalaya ophiolites were formed only during subduction tectonics. Thus, we argue that the mantle peridotites in the ophiolites of northeast India evolved from lherzolite through clinopyroxene‐harzburgite and harzburgite then to highly refractory dunite, supporting multistage melting and melt‐rock reaction processes during their generation.
The mantle peridotites of the Neo‐Tethyan ophiolites of the Tuting‐Tidding Suture Zone, Eastern Himalaya, and Indo‐Myanmar Orogenic Belt, Northeast India underwent multiple episodes of partial melting, depletion, enrichment, and refertilization processes during the evolution of the Tethyan oceanic lithosphere at a tectonic setting that changed in time from a mid‐oceanic ridge to a forearc spreading setting. Comprehensive new mineral chemistry and geochemistry data of mantle peridotites from these two orogenic belts, in concurrence with petrography and field evidence, clearly suggest pre‐subduction origin (MOR) of a minor portion of the ophiolite section and subduction origin (SSZ) of major portions of the ophiolite sections.</description><subject>Aluminum oxide</subject><subject>Belts</subject><subject>Chemical composition</subject><subject>Depletion</subject><subject>Dunite</subject><subject>Earth mantle</subject><subject>Eastern Himalaya</subject><subject>Enrichment</subject><subject>Fertility</subject><subject>Fluids</subject><subject>geochemistry</subject><subject>Indo‐Myanmar Orogenic Belt</subject><subject>Isotopes</subject><subject>Magnesium</subject><subject>mantle peridotite</subject><subject>Melting</subject><subject>mineral chemistry</subject><subject>Multistage melting</subject><subject>Northeast India</subject><subject>Olivine</subject><subject>Ophiolites</subject><subject>Orogeny</subject><subject>Peridotite</subject><subject>Petrogenesis</subject><subject>Rare earth elements</subject><subject>Rocks</subject><subject>Sequencing</subject><subject>Silicates</subject><subject>Spinel</subject><subject>Subduction</subject><subject>Subduction (geology)</subject><subject>Subduction zones</subject><subject>Tectonics</subject><subject>Temperature</subject><subject>Titanium dioxide</subject><subject>Trace elements</subject><issn>0072-1050</issn><issn>1099-1034</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp1kUtOwzAQhi0EEuUhrmCJBQtUsJ24aZYFlZd4ScA6mjjj1iWJi-2q6o4jcA9uxUlwWrZII3k08_3_eDSEHHF2xhkT55PZWToQ-RbpcZbnfc6SdJv0GMtEzCXbJXvezxjjnKW8R76fMTg7wRa98dRq2kAbaqRzdKaywQT01LT0Ee3P59crhukKWmrnU2PrdU8729AwRToGH9C19MY0UMMKKLQVvW2rTvcQRQ04-rSeZBS9wDp0tp1wsrYOqILtWtpBg0vr3rvPvNhFRKIzHXkDB2RHQ-3x8O_dJ29X49fLm_790_Xt5ei-r8QwbiwZVGnKBWCFSoq0kkkGupQ8H5TItExAZTJBUealzMqBhkolOCy5AjWIZZ3sk-ON79zZjwX6UMzswrVxZCEyKfNcxIjUyYZSznrvUBdzF3d3q4KzortEMZkV3SUiebohl6bG1X9YcX23pn8B15KP2w</recordid><startdate>202212</startdate><enddate>202212</enddate><creator>Singh, Athokpam Krishnakanta</creator><creator>Chung, Sun‐Lin</creator><creator>Somerville, Ian D.</creator><general>John Wiley & Sons, Inc</general><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0003-1530-195X</orcidid><orcidid>https://orcid.org/0000-0002-5362-4496</orcidid><orcidid>https://orcid.org/0000-0001-8379-9097</orcidid></search><sort><creationdate>202212</creationdate><title>Petrogenesis of mantle peridotites in Neo‐Tethyan ophiolites from the Eastern Himalaya and Indo‐Myanmar Orogenic Belt in the geo‐tectonic framework of Southeast Asia</title><author>Singh, Athokpam Krishnakanta ; Chung, Sun‐Lin ; Somerville, Ian D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2899-50ad4412aedec524d537afb5196be0f53ac753e2b9b57b6fadc3e8b1cac63e2f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Aluminum oxide</topic><topic>Belts</topic><topic>Chemical composition</topic><topic>Depletion</topic><topic>Dunite</topic><topic>Earth mantle</topic><topic>Eastern Himalaya</topic><topic>Enrichment</topic><topic>Fertility</topic><topic>Fluids</topic><topic>geochemistry</topic><topic>Indo‐Myanmar Orogenic Belt</topic><topic>Isotopes</topic><topic>Magnesium</topic><topic>mantle peridotite</topic><topic>Melting</topic><topic>mineral chemistry</topic><topic>Multistage melting</topic><topic>Northeast India</topic><topic>Olivine</topic><topic>Ophiolites</topic><topic>Orogeny</topic><topic>Peridotite</topic><topic>Petrogenesis</topic><topic>Rare earth elements</topic><topic>Rocks</topic><topic>Sequencing</topic><topic>Silicates</topic><topic>Spinel</topic><topic>Subduction</topic><topic>Subduction (geology)</topic><topic>Subduction zones</topic><topic>Tectonics</topic><topic>Temperature</topic><topic>Titanium dioxide</topic><topic>Trace elements</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Singh, Athokpam Krishnakanta</creatorcontrib><creatorcontrib>Chung, Sun‐Lin</creatorcontrib><creatorcontrib>Somerville, Ian D.</creatorcontrib><collection>CrossRef</collection><collection>Environment Abstracts</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><collection>Environment Abstracts</collection><jtitle>Geological journal (Chichester, England)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Singh, Athokpam Krishnakanta</au><au>Chung, Sun‐Lin</au><au>Somerville, Ian D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Petrogenesis of mantle peridotites in Neo‐Tethyan ophiolites from the Eastern Himalaya and Indo‐Myanmar Orogenic Belt in the geo‐tectonic framework of Southeast Asia</atitle><jtitle>Geological journal (Chichester, England)</jtitle><date>2022-12</date><risdate>2022</risdate><volume>57</volume><issue>12</issue><spage>4886</spage><epage>4919</epage><pages>4886-4919</pages><issn>0072-1050</issn><eissn>1099-1034</eissn><abstract>The Neo‐Tethyan ophiolites of the Tuting‐Tidding Suture Zone (TTSZ), Eastern Himalaya (viz., Tidding Ophiolite Complex and Mayodia Ophiolite Complex) and Indo‐Myanmar Orogenic Belt (IMOB, i.e., Nagaland Ophiolite Complex and Manipur Ophiolite Complex) which lie along the southern extension of the Indus‐Tsangpo Suture Zone have been collectively investigated through the mantle‐derived peridotite sequence. The peridotites (harzburgite and dunites) in the Eastern Himalaya ophiolites are refractory, constrained by the high Fo olivine content (~95), high Cr# [Cr/(Cr + Al)] (0.90–0.99), as well as by the parental melt composition of Cr‐spinels (Al2O3 melt = 3.05–7.55 wt%, FeO/MgO = 0.69–6.46). They have slightly “U‐shaped” chondrite‐normalized Rare Earth Elements (REE) patterns with slight enrichment in Light Rare Earth Elements (LREE) relative to the patterns expected for residues of partial melting, thereby indicating a reaction with the LREE‐enriched melt. These peridotites represent residual portions of a depleted/enriched mantle that underwent partial melting up to 23% in the nascent forearc of an intra‐oceanic subduction zone, and later metasomatized by high‐temperature silicate melts and low‐temperature hydrous fluids. They are composed of a very refractory olivine‐spinel assemblage (Fo: 91.68–96.44; Cr#: 0.90–0.99), corroborating a boninitic parentage, with influence from melt‐rock interactions. In the case of the IMOB ophiolites, a wide range of chemical compositions is observed in the mantle sequence. Lherzolites display low Cr# (0.12–0.26) and TiO2 (<0.11) associated with high Mg# [Mg/(Mg + Fet)] (0.69–0.76) in the Cr‐spinels present in them. They represent the residual product of a fertile mantle that underwent low‐degree partial melting (2%–10%) in a divergent mid‐ocean ridge (MOR) tectonic setting. On the other hand, the harzburgites and dunites of the IMOB have high Cr# (0.84–0.90) and low TiO2 (<0.06 wt%) Cr‐spinels and exhibit slightly U‐shaped REE distributions indicating their derivation from a highly depleted mantle source, which experienced higher degree partial melting (17%–24%) similar to those of supra‐subduction zone (SSZ) harzburgites and dunites of the TTSZ peridotites. The occurrence of both MOR and SSZ types of melting regimes indicates that the peridotites in the IMOB ophiolites formed at two major different stages of the pre‐subduction and subduction events, respectively. However, the peridotites of Eastern Himalaya ophiolites were formed only during subduction tectonics. Thus, we argue that the mantle peridotites in the ophiolites of northeast India evolved from lherzolite through clinopyroxene‐harzburgite and harzburgite then to highly refractory dunite, supporting multistage melting and melt‐rock reaction processes during their generation.
The mantle peridotites of the Neo‐Tethyan ophiolites of the Tuting‐Tidding Suture Zone, Eastern Himalaya, and Indo‐Myanmar Orogenic Belt, Northeast India underwent multiple episodes of partial melting, depletion, enrichment, and refertilization processes during the evolution of the Tethyan oceanic lithosphere at a tectonic setting that changed in time from a mid‐oceanic ridge to a forearc spreading setting. Comprehensive new mineral chemistry and geochemistry data of mantle peridotites from these two orogenic belts, in concurrence with petrography and field evidence, clearly suggest pre‐subduction origin (MOR) of a minor portion of the ophiolite section and subduction origin (SSZ) of major portions of the ophiolite sections.</abstract><cop>Hoboken, USA</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/gj.4629</doi><tpages>34</tpages><orcidid>https://orcid.org/0000-0003-1530-195X</orcidid><orcidid>https://orcid.org/0000-0002-5362-4496</orcidid><orcidid>https://orcid.org/0000-0001-8379-9097</orcidid></addata></record> |
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| subjects | Aluminum oxide Belts Chemical composition Depletion Dunite Earth mantle Eastern Himalaya Enrichment Fertility Fluids geochemistry Indo‐Myanmar Orogenic Belt Isotopes Magnesium mantle peridotite Melting mineral chemistry Multistage melting Northeast India Olivine Ophiolites Orogeny Peridotite Petrogenesis Rare earth elements Rocks Sequencing Silicates Spinel Subduction Subduction (geology) Subduction zones Tectonics Temperature Titanium dioxide Trace elements |
| title | Petrogenesis of mantle peridotites in Neo‐Tethyan ophiolites from the Eastern Himalaya and Indo‐Myanmar Orogenic Belt in the geo‐tectonic framework of Southeast Asia |
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