An island arc origin of Jurassic plagiogranite in the Shiquanhe ophiolite, western Bangong Suture, Tibet: Zircon U–Pb chronology, geochemistry, and tectonic implications of Bangong Meso‐Tethys
The plagiogranites in ophiolites are minor in volume but can provide crucial information for the origin and tectonic evolution of ancient oceanic lithosphere. This paper presents the geochronology and geochemistry of a newly discovered plagiogranite in the Shiquanhe ophiolite, from the west end of t...
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| Veröffentlicht in: | Geological journal (Chichester, England) England), 2021-08, Vol.56 (8), p.3941-3958 |
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| description | The plagiogranites in ophiolites are minor in volume but can provide crucial information for the origin and tectonic evolution of ancient oceanic lithosphere. This paper presents the geochronology and geochemistry of a newly discovered plagiogranite in the Shiquanhe ophiolite, from the west end of the Shiquanhe‐Jiali ophiolite sub‐belt, Bangong Suture, central Tibet. Zircon U–Pb dating of two samples yields Middle Jurassic ages (167.4 ± 1.2 Ma and 167.5 ± 1.5 Ma). The plagiogranite has positive whole‐rock εNd(t) (4.2–4.9) and zircon εHf(t) (9.6–14.3) values, high Th/Nb ratios (0.6–2.8) but relatively low La/Nb ratios (0.9–9.9), indicating that it was possibly derived from a depleted mantle with the contribution of minor subducted sediments. The LREE‐enrichment but HREE‐flat patterns with negative Eu anomalies and negative Nb‐Ti anomalies resemble those of shear‐type plagiogranites, which mean that this rock was likely formed by partial melting of metabasite. Combined with the plagiogranite which does not exhibit chilled contacts against the Shiquanhe ophiolitic metabasite, suggests that the plagiogranite may have been derived from the associated ophiolitic metabasite. Geochemical calculating and modelling indicate that the plagiogranite was possibly produced by a low degree ( |
| doi_str_mv | 10.1002/gj.4137 |
| format | Article |
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Cartoon illustration showing the petrogenesis model of the Shiquanhe plagiogranite during the Middle Jurassic.</description><identifier>ISSN: 0072-1050</identifier><identifier>EISSN: 1099-1034</identifier><identifier>DOI: 10.1002/gj.4137</identifier><language>eng</language><publisher>Hoboken, USA: John Wiley & Sons, Inc</publisher><subject>Anomalies ; Bangong Suture ; Belts ; Flat patterns ; Geochemistry ; Geochronology ; Geochronometry ; island arc ; Island arcs ; Isotopes ; Jurassic ; Lead ; Lithosphere ; Low pressure ; Low temperature ; Melting ; metabasite ; Niobium ; Oceanic islands ; Ophiolites ; Paleoceanography ; Radiometric dating ; Ratios ; Rocks ; Sediment ; Sediments ; shear‐type plagiogranites ; Shiquanhe ophiolite ; Subduction (geology) ; Tectonics ; Zircon</subject><ispartof>Geological journal (Chichester, England), 2021-08, Vol.56 (8), p.3941-3958</ispartof><rights>2021 John Wiley & Sons Ltd.</rights><rights>2021 John Wiley & Sons, Ltd.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3127-b2c129da70965904229204f145c5386b62b6b6f71f39f55be24b3603b2ba2a6e3</citedby><cites>FETCH-LOGICAL-a3127-b2c129da70965904229204f145c5386b62b6b6f71f39f55be24b3603b2ba2a6e3</cites><orcidid>0000-0002-7556-6565 ; 0000-0002-3310-5314</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.4137$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fgj.4137$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids></links><search><creatorcontrib>Li, Wei</creatorcontrib><creatorcontrib>Liu, Nina</creatorcontrib><creatorcontrib>Nayak, Ranjit</creatorcontrib><creatorcontrib>Ma, Yaoliang</creatorcontrib><creatorcontrib>Wang, Jinjun</creatorcontrib><creatorcontrib>Hu, Xichong</creatorcontrib><creatorcontrib>Pang, Jiehui</creatorcontrib><creatorcontrib>Huang, Weile</creatorcontrib><creatorcontrib>Zhong, Yun</creatorcontrib><creatorcontrib>Liu, Weiliang</creatorcontrib><title>An island arc origin of Jurassic plagiogranite in the Shiquanhe ophiolite, western Bangong Suture, Tibet: Zircon U–Pb chronology, geochemistry, and tectonic implications of Bangong Meso‐Tethys</title><title>Geological journal (Chichester, England)</title><description>The plagiogranites in ophiolites are minor in volume but can provide crucial information for the origin and tectonic evolution of ancient oceanic lithosphere. This paper presents the geochronology and geochemistry of a newly discovered plagiogranite in the Shiquanhe ophiolite, from the west end of the Shiquanhe‐Jiali ophiolite sub‐belt, Bangong Suture, central Tibet. Zircon U–Pb dating of two samples yields Middle Jurassic ages (167.4 ± 1.2 Ma and 167.5 ± 1.5 Ma). The plagiogranite has positive whole‐rock εNd(t) (4.2–4.9) and zircon εHf(t) (9.6–14.3) values, high Th/Nb ratios (0.6–2.8) but relatively low La/Nb ratios (0.9–9.9), indicating that it was possibly derived from a depleted mantle with the contribution of minor subducted sediments. The LREE‐enrichment but HREE‐flat patterns with negative Eu anomalies and negative Nb‐Ti anomalies resemble those of shear‐type plagiogranites, which mean that this rock was likely formed by partial melting of metabasite. Combined with the plagiogranite which does not exhibit chilled contacts against the Shiquanhe ophiolitic metabasite, suggests that the plagiogranite may have been derived from the associated ophiolitic metabasite. Geochemical calculating and modelling indicate that the plagiogranite was possibly produced by a low degree (<10%) partial melting of metabasite and replenished by minor sediments melts at low temperature (<800 °C) and low pressure (<0.1 GPa) conditions. The Shiquanhe plagiogranite, together with the contemporaneous Lagkorco plagiogranite in the same ophiolite sub‐belt, indicates that an intra‐oceanic island arc system was developed in the Bangong Meso‐Tethys during the Middle Jurassic.
Cartoon illustration showing the petrogenesis model of the Shiquanhe plagiogranite during the Middle Jurassic.</description><subject>Anomalies</subject><subject>Bangong Suture</subject><subject>Belts</subject><subject>Flat patterns</subject><subject>Geochemistry</subject><subject>Geochronology</subject><subject>Geochronometry</subject><subject>island arc</subject><subject>Island arcs</subject><subject>Isotopes</subject><subject>Jurassic</subject><subject>Lead</subject><subject>Lithosphere</subject><subject>Low pressure</subject><subject>Low temperature</subject><subject>Melting</subject><subject>metabasite</subject><subject>Niobium</subject><subject>Oceanic islands</subject><subject>Ophiolites</subject><subject>Paleoceanography</subject><subject>Radiometric dating</subject><subject>Ratios</subject><subject>Rocks</subject><subject>Sediment</subject><subject>Sediments</subject><subject>shear‐type plagiogranites</subject><subject>Shiquanhe ophiolite</subject><subject>Subduction (geology)</subject><subject>Tectonics</subject><subject>Zircon</subject><issn>0072-1050</issn><issn>1099-1034</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp1kUtOHDEQhi0EEgNBuYKlLLKAIX70I84OUDIEEQWJYZNNyzZut0c9rsZ2C81ujoDElTgJJ4knA8ts6vnpryoVQh8pOaWEsC92cVpQXu-gCSVCTCnhxS6aEFKzHJdkHx3EuCCEUlLQCXo589jFXvp7LIPGEJx1HkOLr8YgY3QaD720DmyQ3iWDczN1Bt927mGUPkcwdA763DrBjyYmEzw-l96Ct_h2TGPI9blTJn3Df1zQ4PHd6_r5RmHdBfDQg12dYGtAd2bpYgo52-ySjE7g83S3HHqnZXLg42atd-1fJsLr-mluUreKH9BeK_tojt78Ibr78X1-cTm9_j37eXF2PZWcsnqqmKZM3MuaiKoUpGBMMFK0tCh1yb9WqmIqm7amLRdtWSrDCsUrwhVTksnK8EP0aas7BHgY87XNAsbg88iGlWVdccFrkanPW0oHiDGYthmCW8qwaihpNi9q7KLZvCiTx1vy0fVm9T-smV39o_8CPI6Vhg</recordid><startdate>202108</startdate><enddate>202108</enddate><creator>Li, Wei</creator><creator>Liu, Nina</creator><creator>Nayak, Ranjit</creator><creator>Ma, Yaoliang</creator><creator>Wang, Jinjun</creator><creator>Hu, Xichong</creator><creator>Pang, Jiehui</creator><creator>Huang, Weile</creator><creator>Zhong, Yun</creator><creator>Liu, Weiliang</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/0000-0002-7556-6565</orcidid><orcidid>https://orcid.org/0000-0002-3310-5314</orcidid></search><sort><creationdate>202108</creationdate><title>An island arc origin of Jurassic plagiogranite in the Shiquanhe ophiolite, western Bangong Suture, Tibet: Zircon U–Pb chronology, geochemistry, and tectonic implications of Bangong Meso‐Tethys</title><author>Li, Wei ; 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This paper presents the geochronology and geochemistry of a newly discovered plagiogranite in the Shiquanhe ophiolite, from the west end of the Shiquanhe‐Jiali ophiolite sub‐belt, Bangong Suture, central Tibet. Zircon U–Pb dating of two samples yields Middle Jurassic ages (167.4 ± 1.2 Ma and 167.5 ± 1.5 Ma). The plagiogranite has positive whole‐rock εNd(t) (4.2–4.9) and zircon εHf(t) (9.6–14.3) values, high Th/Nb ratios (0.6–2.8) but relatively low La/Nb ratios (0.9–9.9), indicating that it was possibly derived from a depleted mantle with the contribution of minor subducted sediments. The LREE‐enrichment but HREE‐flat patterns with negative Eu anomalies and negative Nb‐Ti anomalies resemble those of shear‐type plagiogranites, which mean that this rock was likely formed by partial melting of metabasite. Combined with the plagiogranite which does not exhibit chilled contacts against the Shiquanhe ophiolitic metabasite, suggests that the plagiogranite may have been derived from the associated ophiolitic metabasite. Geochemical calculating and modelling indicate that the plagiogranite was possibly produced by a low degree (<10%) partial melting of metabasite and replenished by minor sediments melts at low temperature (<800 °C) and low pressure (<0.1 GPa) conditions. The Shiquanhe plagiogranite, together with the contemporaneous Lagkorco plagiogranite in the same ophiolite sub‐belt, indicates that an intra‐oceanic island arc system was developed in the Bangong Meso‐Tethys during the Middle Jurassic.
Cartoon illustration showing the petrogenesis model of the Shiquanhe plagiogranite during the Middle Jurassic.</abstract><cop>Hoboken, USA</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/gj.4137</doi><tpages>18</tpages><orcidid>https://orcid.org/0000-0002-7556-6565</orcidid><orcidid>https://orcid.org/0000-0002-3310-5314</orcidid></addata></record> |
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| subjects | Anomalies Bangong Suture Belts Flat patterns Geochemistry Geochronology Geochronometry island arc Island arcs Isotopes Jurassic Lead Lithosphere Low pressure Low temperature Melting metabasite Niobium Oceanic islands Ophiolites Paleoceanography Radiometric dating Ratios Rocks Sediment Sediments shear‐type plagiogranites Shiquanhe ophiolite Subduction (geology) Tectonics Zircon |
| title | An island arc origin of Jurassic plagiogranite in the Shiquanhe ophiolite, western Bangong Suture, Tibet: Zircon U–Pb chronology, geochemistry, and tectonic implications of Bangong Meso‐Tethys |
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