Kai Weng, Yunpeng Dong, Liuqing Jiang, Zhongping Ma, Shuangshuang Wang, Bo Chen
{"title":"中国阿尔泰地区古生代花岗质岩石的地球化学、地质年代学和Sr–Nd–Hf同位素:俯冲-吸积向同碰撞/碰撞后转换的制约因素","authors":"Kai Weng, Yunpeng Dong, Liuqing Jiang, Zhongping Ma, Shuangshuang Wang, Bo Chen","doi":"10.1144/jgs2022-150","DOIUrl":null,"url":null,"abstract":"The Chinese Altai features abundant granitoids, which can be used to reconstruct the tectonic evolution of the orogen. Here, petrological, geochronological, geochemical and isotopic analyses have been conducted on several representative granitoids from the Altai region. U‒Pb dating revealed ages of 444±3 Ma for gneissic granites, 406±8 Ma for syenogranites, 280±6 Ma for diorites, 278±3 Ma for two-mica monzonitic granites, and 269±3 Ma for muscovite granites. Ordovician gneissic granites have I-type arc-related element characteristics and are derived from volcanic magmas extracted from the mantle wedge metasomatized by subducted sediment in a continental arc. Devonian syenogranites show I-type arc and within-plate granite dual geochemical signatures, suggesting derivation from volcanic magmas extracted from the lithospheric mantle metasomatized by subducted fluid/melt in a back-arc basin. Permian diorites are Mg-diorites derived from a mixed magma source involving residual subducted basaltic oceanic crust and lithospheric mantle; two-mica monzonitic granites are S-type granites originating from crustal recycling of sedimentary rocks; muscovite granites are leucogranites resulting from the anatexis of ancient metasedimentary rocks. Their tectonic setting is syn/postcollision. Combining with previous data, we propose that the Chinese Altai experienced middle–late Ordovician continental arc magmatism, early–middle Devonian back-arc extension, and early–middle Permian arc–arc syn/postcollision.\n \n Supplementary material:\n https://doi.org/10.6084/m9.figshare.c.6420236\n","PeriodicalId":17320,"journal":{"name":"Journal of the Geological Society","volume":" ","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Geochemistry, geochronology and Sr–Nd–Hf isotopes of Paleozoic granitoids in the Chinese Altai, NW China: Constraints on the conversion from subduction–accretion to syn/post-collision\",\"authors\":\"Kai Weng, Yunpeng Dong, Liuqing Jiang, Zhongping Ma, Shuangshuang Wang, Bo Chen\",\"doi\":\"10.1144/jgs2022-150\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The Chinese Altai features abundant granitoids, which can be used to reconstruct the tectonic evolution of the orogen. Here, petrological, geochronological, geochemical and isotopic analyses have been conducted on several representative granitoids from the Altai region. U‒Pb dating revealed ages of 444±3 Ma for gneissic granites, 406±8 Ma for syenogranites, 280±6 Ma for diorites, 278±3 Ma for two-mica monzonitic granites, and 269±3 Ma for muscovite granites. Ordovician gneissic granites have I-type arc-related element characteristics and are derived from volcanic magmas extracted from the mantle wedge metasomatized by subducted sediment in a continental arc. Devonian syenogranites show I-type arc and within-plate granite dual geochemical signatures, suggesting derivation from volcanic magmas extracted from the lithospheric mantle metasomatized by subducted fluid/melt in a back-arc basin. Permian diorites are Mg-diorites derived from a mixed magma source involving residual subducted basaltic oceanic crust and lithospheric mantle; two-mica monzonitic granites are S-type granites originating from crustal recycling of sedimentary rocks; muscovite granites are leucogranites resulting from the anatexis of ancient metasedimentary rocks. Their tectonic setting is syn/postcollision. Combining with previous data, we propose that the Chinese Altai experienced middle–late Ordovician continental arc magmatism, early–middle Devonian back-arc extension, and early–middle Permian arc–arc syn/postcollision.\\n \\n Supplementary material:\\n https://doi.org/10.6084/m9.figshare.c.6420236\\n\",\"PeriodicalId\":17320,\"journal\":{\"name\":\"Journal of the Geological Society\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2023-02-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the Geological Society\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1144/jgs2022-150\",\"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 the Geological Society","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/jgs2022-150","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}
Geochemistry, geochronology and Sr–Nd–Hf isotopes of Paleozoic granitoids in the Chinese Altai, NW China: Constraints on the conversion from subduction–accretion to syn/post-collision
The Chinese Altai features abundant granitoids, which can be used to reconstruct the tectonic evolution of the orogen. Here, petrological, geochronological, geochemical and isotopic analyses have been conducted on several representative granitoids from the Altai region. U‒Pb dating revealed ages of 444±3 Ma for gneissic granites, 406±8 Ma for syenogranites, 280±6 Ma for diorites, 278±3 Ma for two-mica monzonitic granites, and 269±3 Ma for muscovite granites. Ordovician gneissic granites have I-type arc-related element characteristics and are derived from volcanic magmas extracted from the mantle wedge metasomatized by subducted sediment in a continental arc. Devonian syenogranites show I-type arc and within-plate granite dual geochemical signatures, suggesting derivation from volcanic magmas extracted from the lithospheric mantle metasomatized by subducted fluid/melt in a back-arc basin. Permian diorites are Mg-diorites derived from a mixed magma source involving residual subducted basaltic oceanic crust and lithospheric mantle; two-mica monzonitic granites are S-type granites originating from crustal recycling of sedimentary rocks; muscovite granites are leucogranites resulting from the anatexis of ancient metasedimentary rocks. Their tectonic setting is syn/postcollision. Combining with previous data, we propose that the Chinese Altai experienced middle–late Ordovician continental arc magmatism, early–middle Devonian back-arc extension, and early–middle Permian arc–arc syn/postcollision.
Supplementary material:
https://doi.org/10.6084/m9.figshare.c.6420236
期刊介绍:
Journal of the Geological Society (JGS) is owned and published by the Geological Society of London.
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