Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings
Low‐Al chromitites from the Manipur ophiolite contain a wide range of mineral inclusions, including hydrous and anhydrous silicates, sulphides, and platinum group minerals (PGM). The common inclusions are primary silicates, such as clinopyroxene, orthopyroxene and secondary silicate inclusions, such...
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| Veröffentlicht in: | Geological journal (Chichester, England) England), 2023-04, Vol.58 (4), p.1442-1465 |
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| description | Low‐Al chromitites from the Manipur ophiolite contain a wide range of mineral inclusions, including hydrous and anhydrous silicates, sulphides, and platinum group minerals (PGM). The common inclusions are primary silicates, such as clinopyroxene, orthopyroxene and secondary silicate inclusions, such as chlorite, serpentine, and garnet. These inclusions are small ( |
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Low‐Al chromitites Cr# values ranging between 66 and 81.
Os‐poor laurite only type of PGM inclusion hosted in the chromitite.
Parental melt TiO2 (0.16–0.48 wt.%), Al2O3 (10.18–14.58 wt.%) suggest arc‐affinity.
Parental melt derived from a depleted mantle source.</description><identifier>ISSN: 0072-1050</identifier><identifier>EISSN: 1099-1034</identifier><identifier>DOI: 10.1002/gj.4668</identifier><language>eng</language><publisher>Hoboken, USA: John Wiley & Sons, Inc</publisher><subject>Aluminum oxide ; boninite ; Chlorite ; Chromite ; Chromium oxides ; Clinochlore ; Fractures ; Garnet ; hydrothermal ; Lava ; Magma ; Mineral inclusions ; Mineralization ; Minerals ; ophiolite ; parental melt ; Platinum ; Recrystallization ; Serpentine ; Silica ; Silicates ; Subduction ; Subduction (geology) ; Subduction zones ; Sulphides ; Titanium dioxide</subject><ispartof>Geological journal (Chichester, England), 2023-04, Vol.58 (4), p.1442-1465</ispartof><rights>2022 John Wiley & Sons Ltd.</rights><rights>2023 John Wiley & Sons, Ltd.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c2518-5fbf81d7a647f139fb8441d2a9525f0a5c0438f121f7c7bbdaa5bd063668b5003</cites></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.4668$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fgj.4668$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>315,782,786,1419,27931,27932,45581,45582</link.rule.ids></links><search><creatorcontrib>Singh, Toijam Bapin</creatorcontrib><creatorcontrib>Maibam, Bidyananda</creatorcontrib><creatorcontrib>Kapsiotis, Argyrios</creatorcontrib><title>Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings</title><title>Geological journal (Chichester, England)</title><description>Low‐Al chromitites from the Manipur ophiolite contain a wide range of mineral inclusions, including hydrous and anhydrous silicates, sulphides, and platinum group minerals (PGM). The common inclusions are primary silicates, such as clinopyroxene, orthopyroxene and secondary silicate inclusions, such as chlorite, serpentine, and garnet. These inclusions are small (<30 μm in PGM, <100 μm in silicates) and randomly distributed throughout their host chromite grains. The shape and texture indicate some inclusions (clinopyroxene, orthopyroxene, PGMs) trapped during the magmatic stage and most inclusions (chlorite, serpentine, and uvarovite) trapped during recrystallization of chromite. Clinopyroxene was discrete inside the chromite, with Cr2O3 content ranging from 0.62 to 1.77 wt.%, and Al2O3 varying between 0.96 to 1.63 wt.%. Orthopyroxene is enstatite (En93Wo2Fs4), Cr2O3 varies from 0.58 to 1.8 wt.% and the minor amount of CaO (0.41–0.81 wt.%), and Al2O3 (0.58–0.83 wt.%). Uvarovite is present in two forms: discrete crystal inclusions (anhydrous) in chromites and fractures (hydrous) as fillings. The chlorite occurs as lath shaped, and patchy phase is Cr‐rich variety ‐ kammererite (clinochlore) and penninite with variable Cr2O3 (0.22–7.25 wt.%) and FeO (2.5–3.9 wt.%). The PGM in the studied chromite are laurite (Ru, Os, Ir)S2. The parental melts of chromitites had low TiO2 (0.16–0.48 wt.%) and Al2O3 (10.18–14.58 wt.%) contents, and primary mineral inclusions, suggesting an arc‐like geochemical affinity, and the estimated melt composition is comparable with that of boninitic magma.
Low‐Al chromitites Cr# values ranging between 66 and 81.
Os‐poor laurite only type of PGM inclusion hosted in the chromitite.
Parental melt TiO2 (0.16–0.48 wt.%), Al2O3 (10.18–14.58 wt.%) suggest arc‐affinity.
Parental melt derived from a depleted mantle source.</description><subject>Aluminum oxide</subject><subject>boninite</subject><subject>Chlorite</subject><subject>Chromite</subject><subject>Chromium oxides</subject><subject>Clinochlore</subject><subject>Fractures</subject><subject>Garnet</subject><subject>hydrothermal</subject><subject>Lava</subject><subject>Magma</subject><subject>Mineral inclusions</subject><subject>Mineralization</subject><subject>Minerals</subject><subject>ophiolite</subject><subject>parental melt</subject><subject>Platinum</subject><subject>Recrystallization</subject><subject>Serpentine</subject><subject>Silica</subject><subject>Silicates</subject><subject>Subduction</subject><subject>Subduction (geology)</subject><subject>Subduction zones</subject><subject>Sulphides</subject><subject>Titanium dioxide</subject><issn>0072-1050</issn><issn>1099-1034</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNp1kU1OwzAQhS0EEuVHXMESCxbQMs5Pk7BDFZQiECxgHTmO3bpy7GA7qsqKI3AnbsJJcFNYsvLI75v3RjMInRAYEYDocr4cJeNxvoMGBIpiSCBOdtEAIItCncI-OnBuCUAIJGSAvp4V9VJ3zffH59yarsWN1NxShamusZNKMuo5lpqpzkmjXSixX3CszCq0XCvMFtY00kvPHTai1x6plm1nsWkX0qigXGBtbFCo83ima0mv8Kxpe-_e02g8scHueXrzly_fe20Tp6ljXHvsuqruWP_7bjTHjvsw-twdoT1BlePHv-8her29eZncDR-eprPJ9cOQRSnJh6moRE7qjI6TTJC4EFWeJKSOaJFGqQCaMkjiXJCIiIxlVVVTmlY1jOOwzSoFiA_R6da3teat486XS9NZHSLLKCviLCvyOA7U2ZZi1jhnuShbKxtq1yWBcnOhcr4sNxcK5PmWXEnF1_9h5fS-p38A492YTA</recordid><startdate>202304</startdate><enddate>202304</enddate><creator>Singh, Toijam Bapin</creator><creator>Maibam, Bidyananda</creator><creator>Kapsiotis, Argyrios</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></search><sort><creationdate>202304</creationdate><title>Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings</title><author>Singh, Toijam Bapin ; Maibam, Bidyananda ; Kapsiotis, Argyrios</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2518-5fbf81d7a647f139fb8441d2a9525f0a5c0438f121f7c7bbdaa5bd063668b5003</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Aluminum oxide</topic><topic>boninite</topic><topic>Chlorite</topic><topic>Chromite</topic><topic>Chromium oxides</topic><topic>Clinochlore</topic><topic>Fractures</topic><topic>Garnet</topic><topic>hydrothermal</topic><topic>Lava</topic><topic>Magma</topic><topic>Mineral inclusions</topic><topic>Mineralization</topic><topic>Minerals</topic><topic>ophiolite</topic><topic>parental melt</topic><topic>Platinum</topic><topic>Recrystallization</topic><topic>Serpentine</topic><topic>Silica</topic><topic>Silicates</topic><topic>Subduction</topic><topic>Subduction (geology)</topic><topic>Subduction zones</topic><topic>Sulphides</topic><topic>Titanium dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Singh, Toijam Bapin</creatorcontrib><creatorcontrib>Maibam, Bidyananda</creatorcontrib><creatorcontrib>Kapsiotis, Argyrios</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, Toijam Bapin</au><au>Maibam, Bidyananda</au><au>Kapsiotis, Argyrios</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings</atitle><jtitle>Geological journal (Chichester, England)</jtitle><date>2023-04</date><risdate>2023</risdate><volume>58</volume><issue>4</issue><spage>1442</spage><epage>1465</epage><pages>1442-1465</pages><issn>0072-1050</issn><eissn>1099-1034</eissn><abstract>Low‐Al chromitites from the Manipur ophiolite contain a wide range of mineral inclusions, including hydrous and anhydrous silicates, sulphides, and platinum group minerals (PGM). The common inclusions are primary silicates, such as clinopyroxene, orthopyroxene and secondary silicate inclusions, such as chlorite, serpentine, and garnet. These inclusions are small (<30 μm in PGM, <100 μm in silicates) and randomly distributed throughout their host chromite grains. The shape and texture indicate some inclusions (clinopyroxene, orthopyroxene, PGMs) trapped during the magmatic stage and most inclusions (chlorite, serpentine, and uvarovite) trapped during recrystallization of chromite. Clinopyroxene was discrete inside the chromite, with Cr2O3 content ranging from 0.62 to 1.77 wt.%, and Al2O3 varying between 0.96 to 1.63 wt.%. Orthopyroxene is enstatite (En93Wo2Fs4), Cr2O3 varies from 0.58 to 1.8 wt.% and the minor amount of CaO (0.41–0.81 wt.%), and Al2O3 (0.58–0.83 wt.%). Uvarovite is present in two forms: discrete crystal inclusions (anhydrous) in chromites and fractures (hydrous) as fillings. The chlorite occurs as lath shaped, and patchy phase is Cr‐rich variety ‐ kammererite (clinochlore) and penninite with variable Cr2O3 (0.22–7.25 wt.%) and FeO (2.5–3.9 wt.%). The PGM in the studied chromite are laurite (Ru, Os, Ir)S2. The parental melts of chromitites had low TiO2 (0.16–0.48 wt.%) and Al2O3 (10.18–14.58 wt.%) contents, and primary mineral inclusions, suggesting an arc‐like geochemical affinity, and the estimated melt composition is comparable with that of boninitic magma.
Low‐Al chromitites Cr# values ranging between 66 and 81.
Os‐poor laurite only type of PGM inclusion hosted in the chromitite.
Parental melt TiO2 (0.16–0.48 wt.%), Al2O3 (10.18–14.58 wt.%) suggest arc‐affinity.
Parental melt derived from a depleted mantle source.</abstract><cop>Hoboken, USA</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/gj.4668</doi><tpages>24</tpages></addata></record> |
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| subjects | Aluminum oxide boninite Chlorite Chromite Chromium oxides Clinochlore Fractures Garnet hydrothermal Lava Magma Mineral inclusions Mineralization Minerals ophiolite parental melt Platinum Recrystallization Serpentine Silica Silicates Subduction Subduction (geology) Subduction zones Sulphides Titanium dioxide |
| title | Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings |
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