Jia-Wei Bai , Jian-Jun Fan , Yu-Jie Hao , Bo-Chuan Zhang , Si-Lin Sun
{"title":"西藏晚侏罗世-早白垩世雷邦科蛇绿岩:中特提斯洋构造演化的制约因素","authors":"Jia-Wei Bai , Jian-Jun Fan , Yu-Jie Hao , Bo-Chuan Zhang , Si-Lin Sun","doi":"10.1016/j.jseaes.2024.106173","DOIUrl":null,"url":null,"abstract":"<div><p>Ophiolites are widely distributed within the Shiquanhe-Namco-Jiali Ophiolite (SNJO) belt, central Tibet. Further studies on these ophiolites are important for understanding of the Mesozoic tectonic evolution of the Meso-Tethys Ocean. This study presents petrological, chronological, and geochemical data on the ophiolite in the Rebangco area, located at the northern margin of the SNJO belt. Cumulate gabbros of the Rebangco ophiolite contain zircon grains with an age of 152 and they are intruded by diabase with a zircon U-Pb age of 122 Ma. Both diabases and basalts of the ophiolite have geochemical affinity of both island arc and mid-ocean ridge basalts (MORB). Primary magmas were derived from a depleted mantle with contributions from subducted sediments. The source of sandstone surrounding the Rebangco ophiolite originated from a continental magmatic arc in the North Lhasa Terrane. Our study, combined with the previous work, suggest that the ophiolites in the SNJO belt were formed in an oceanic back-arc basin and this belt is an autochthonous mélange zone. This study discusses the tectonic attributes of the SNJO belt and reconstructs the subduction process of the Meso-Tethys Ocean during the Jurassic-Cretaceous. These findings are important for a better understanding of the convergence and closure processes in the Meso-Tethys Ocean.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Late Jurassic–Early Cretaceous Rebangco ophiolite, Tibet: Constraints on the Meso-Tethys Ocean tectonic evolution\",\"authors\":\"Jia-Wei Bai , Jian-Jun Fan , Yu-Jie Hao , Bo-Chuan Zhang , Si-Lin Sun\",\"doi\":\"10.1016/j.jseaes.2024.106173\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Ophiolites are widely distributed within the Shiquanhe-Namco-Jiali Ophiolite (SNJO) belt, central Tibet. Further studies on these ophiolites are important for understanding of the Mesozoic tectonic evolution of the Meso-Tethys Ocean. This study presents petrological, chronological, and geochemical data on the ophiolite in the Rebangco area, located at the northern margin of the SNJO belt. Cumulate gabbros of the Rebangco ophiolite contain zircon grains with an age of 152 and they are intruded by diabase with a zircon U-Pb age of 122 Ma. Both diabases and basalts of the ophiolite have geochemical affinity of both island arc and mid-ocean ridge basalts (MORB). Primary magmas were derived from a depleted mantle with contributions from subducted sediments. The source of sandstone surrounding the Rebangco ophiolite originated from a continental magmatic arc in the North Lhasa Terrane. Our study, combined with the previous work, suggest that the ophiolites in the SNJO belt were formed in an oceanic back-arc basin and this belt is an autochthonous mélange zone. This study discusses the tectonic attributes of the SNJO belt and reconstructs the subduction process of the Meso-Tethys Ocean during the Jurassic-Cretaceous. These findings are important for a better understanding of the convergence and closure processes in the Meso-Tethys Ocean.</p></div>\",\"PeriodicalId\":50253,\"journal\":{\"name\":\"Journal of Asian Earth Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-05-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Asian Earth Sciences\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1367912024001688\",\"RegionNum\":3,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Asian Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1367912024001688","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Late Jurassic–Early Cretaceous Rebangco ophiolite, Tibet: Constraints on the Meso-Tethys Ocean tectonic evolution
Ophiolites are widely distributed within the Shiquanhe-Namco-Jiali Ophiolite (SNJO) belt, central Tibet. Further studies on these ophiolites are important for understanding of the Mesozoic tectonic evolution of the Meso-Tethys Ocean. This study presents petrological, chronological, and geochemical data on the ophiolite in the Rebangco area, located at the northern margin of the SNJO belt. Cumulate gabbros of the Rebangco ophiolite contain zircon grains with an age of 152 and they are intruded by diabase with a zircon U-Pb age of 122 Ma. Both diabases and basalts of the ophiolite have geochemical affinity of both island arc and mid-ocean ridge basalts (MORB). Primary magmas were derived from a depleted mantle with contributions from subducted sediments. The source of sandstone surrounding the Rebangco ophiolite originated from a continental magmatic arc in the North Lhasa Terrane. Our study, combined with the previous work, suggest that the ophiolites in the SNJO belt were formed in an oceanic back-arc basin and this belt is an autochthonous mélange zone. This study discusses the tectonic attributes of the SNJO belt and reconstructs the subduction process of the Meso-Tethys Ocean during the Jurassic-Cretaceous. These findings are important for a better understanding of the convergence and closure processes in the Meso-Tethys Ocean.
期刊介绍:
Journal of Asian Earth Sciences has an open access mirror journal Journal of Asian Earth Sciences: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review.
The Journal of Asian Earth Sciences is an international interdisciplinary journal devoted to all aspects of research related to the solid Earth Sciences of Asia. The Journal publishes high quality, peer-reviewed scientific papers on the regional geology, tectonics, geochemistry and geophysics of Asia. It will be devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be included. Papers must have international appeal and should present work of more than local significance.
The scope includes deep processes of the Asian continent and its adjacent oceans; seismology and earthquakes; orogeny, magmatism, metamorphism and volcanism; growth, deformation and destruction of the Asian crust; crust-mantle interaction; evolution of life (early life, biostratigraphy, biogeography and mass-extinction); fluids, fluxes and reservoirs of mineral and energy resources; surface processes (weathering, erosion, transport and deposition of sediments) and resulting geomorphology; and the response of the Earth to global climate change as viewed within the Asian continent and surrounding oceans.