Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA
{"title":"早古生代双峰岩浆作用记录了喜马拉雅中部由碰撞构造向伸展构造的转变","authors":"Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA","doi":"10.1111/1755-6724.15300","DOIUrl":null,"url":null,"abstract":"<p>The tectonic setting of the Himalaya during the Early Paleozoic has been a subject of enduring debate within the scientific community. Newly discovered bimodal intrusive rocks from comprehensive field geological investigation in the central mountain range were subjected to petrology, zircon U-Pb geochronology, zircon Hf isotopes and whole-rock geochemistry analyses. The Palie bimodal intrusive rocks, comprising amphibolite and granitic gneiss, were formed at ∼489 Ma. The amphibolite exhibits geochemical characteristics consistent with N-MORB, while the granitic gneiss is classified as high potassium calc-alkaline peraluminous S-type granite. Both igneous rocks exhibit negative zircon <i>ε</i><sub>Hf</sub>(<i>t</i>) values and display ancient <i>T</i><sub>DM</sub><sup>C</sup> ages. In conjunction with regional geological survey findings, it can be inferred that the formation of the Palie bimodal intrusive rocks occurred within a post-collision extensional tectonic setting. The amphibolite genesis involved partial melting of an enriched lithospheric mantle with some crustal assimilation, whereas the origin of the granitic gneiss can be attributed to partial melting of pre-existing felsic crust. Our data indicate that during the Early Paleozoic, the Himalaya underwent a transition from a pan-African collisional setting to post-collisional extensional tectonics.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"679-692"},"PeriodicalIF":3.5000,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya\",\"authors\":\"Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA\",\"doi\":\"10.1111/1755-6724.15300\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The tectonic setting of the Himalaya during the Early Paleozoic has been a subject of enduring debate within the scientific community. Newly discovered bimodal intrusive rocks from comprehensive field geological investigation in the central mountain range were subjected to petrology, zircon U-Pb geochronology, zircon Hf isotopes and whole-rock geochemistry analyses. The Palie bimodal intrusive rocks, comprising amphibolite and granitic gneiss, were formed at ∼489 Ma. The amphibolite exhibits geochemical characteristics consistent with N-MORB, while the granitic gneiss is classified as high potassium calc-alkaline peraluminous S-type granite. Both igneous rocks exhibit negative zircon <i>ε</i><sub>Hf</sub>(<i>t</i>) values and display ancient <i>T</i><sub>DM</sub><sup>C</sup> ages. In conjunction with regional geological survey findings, it can be inferred that the formation of the Palie bimodal intrusive rocks occurred within a post-collision extensional tectonic setting. The amphibolite genesis involved partial melting of an enriched lithospheric mantle with some crustal assimilation, whereas the origin of the granitic gneiss can be attributed to partial melting of pre-existing felsic crust. Our data indicate that during the Early Paleozoic, the Himalaya underwent a transition from a pan-African collisional setting to post-collisional extensional tectonics.</p>\",\"PeriodicalId\":7095,\"journal\":{\"name\":\"Acta Geologica Sinica ‐ English Edition\",\"volume\":\"99 3\",\"pages\":\"679-692\"},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2025-06-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Acta Geologica Sinica ‐ English Edition\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/1755-6724.15300\",\"RegionNum\":3,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Geologica Sinica ‐ English Edition","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/1755-6724.15300","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya
The tectonic setting of the Himalaya during the Early Paleozoic has been a subject of enduring debate within the scientific community. Newly discovered bimodal intrusive rocks from comprehensive field geological investigation in the central mountain range were subjected to petrology, zircon U-Pb geochronology, zircon Hf isotopes and whole-rock geochemistry analyses. The Palie bimodal intrusive rocks, comprising amphibolite and granitic gneiss, were formed at ∼489 Ma. The amphibolite exhibits geochemical characteristics consistent with N-MORB, while the granitic gneiss is classified as high potassium calc-alkaline peraluminous S-type granite. Both igneous rocks exhibit negative zircon εHf(t) values and display ancient TDMC ages. In conjunction with regional geological survey findings, it can be inferred that the formation of the Palie bimodal intrusive rocks occurred within a post-collision extensional tectonic setting. The amphibolite genesis involved partial melting of an enriched lithospheric mantle with some crustal assimilation, whereas the origin of the granitic gneiss can be attributed to partial melting of pre-existing felsic crust. Our data indicate that during the Early Paleozoic, the Himalaya underwent a transition from a pan-African collisional setting to post-collisional extensional tectonics.
期刊介绍:
Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.