{"title":"中国四川盆地东北部瓜达卢佩-隆平带碳酸盐岩的地球化学:对古海洋环境和产地的影响","authors":"Shengyang Yao, Chuanlong Mou, Gang Zhou, Qiyu Wang, Xiuping Wang, Peng Ren, Bowen Zan","doi":"10.1007/s13146-024-00934-9","DOIUrl":null,"url":null,"abstract":"<p>As the last part of the Hercynian cycle in the Yangtze region, the Dongwu Movement included the eruption of the Emeishan large igneous province (ELIP) and was an essential event between the Guadalupian and Lopingian, which had significant implications for the paleo-oceanic environment and paleoclimate of the area. To study the changes in the sedimentary environment in the Guadalupian and Lopingian, the Zhenba section was selected, and its trace elements and rare earth elements (REEs) were analyzed. From analysis of the trace elements and REEs in the Guadalupian, the limestone samples had prominent typical shallow-water seawater deposition characteristics and were less affected by terrigenous detritus, which was in an arid oxidation environment; Sr/Cu ranged from 4 to 1381, the Rb/Sr value was low, δCe < 1, Ce<sub>anom</sub> < −0.1, Er/Nd ranged from 0.1 to 0.27, and Y/Ho ranged from 44 to 72. However, in the Lopingian, the limestone samples were more affected by terrigenous detritus, which was in a humid climate with a weak oxidation‒reduction environment; the Sr/Cu ranged from 1 to 656, the Rb/Sr value was high, δCe ≅ 1, Ce<sub>anom</sub> ≥ −0.1, Er/Nd < 0.1, and Y/Ho ranged from 26 to 44. The geochemical diagrams of TiO<sub>2</sub>‒Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3</sub>‒REE, La‒Th‒Sc, Th‒Co‒Zr/10, Th‒Sc‒Zr/10 and <sup>87</sup>Sr/<sup>86</sup>Sr of a sample indicated that the terrigenous detritus of the sample mainly came from the South Qinling active continental margin, rather than the weathering of Emeishan basalt. Acid bentonite came from the Paleo-Tethys island arc or the island arc formed by the subduction of the South China Plate beneath the North China Plate, rather than the ELIP. This evidence supported the view that the North China Plate potentially collided with the South China Plate in middle to late Wujiaping.</p>","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"38 1","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Geochemistry of the Guadalupian—Lopingian carbonate rocks from the NE Sichuan Basin, China: implications for paleo-oceanic environment and provenance\",\"authors\":\"Shengyang Yao, Chuanlong Mou, Gang Zhou, Qiyu Wang, Xiuping Wang, Peng Ren, Bowen Zan\",\"doi\":\"10.1007/s13146-024-00934-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>As the last part of the Hercynian cycle in the Yangtze region, the Dongwu Movement included the eruption of the Emeishan large igneous province (ELIP) and was an essential event between the Guadalupian and Lopingian, which had significant implications for the paleo-oceanic environment and paleoclimate of the area. To study the changes in the sedimentary environment in the Guadalupian and Lopingian, the Zhenba section was selected, and its trace elements and rare earth elements (REEs) were analyzed. From analysis of the trace elements and REEs in the Guadalupian, the limestone samples had prominent typical shallow-water seawater deposition characteristics and were less affected by terrigenous detritus, which was in an arid oxidation environment; Sr/Cu ranged from 4 to 1381, the Rb/Sr value was low, δCe < 1, Ce<sub>anom</sub> < −0.1, Er/Nd ranged from 0.1 to 0.27, and Y/Ho ranged from 44 to 72. However, in the Lopingian, the limestone samples were more affected by terrigenous detritus, which was in a humid climate with a weak oxidation‒reduction environment; the Sr/Cu ranged from 1 to 656, the Rb/Sr value was high, δCe ≅ 1, Ce<sub>anom</sub> ≥ −0.1, Er/Nd < 0.1, and Y/Ho ranged from 26 to 44. The geochemical diagrams of TiO<sub>2</sub>‒Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3</sub>‒REE, La‒Th‒Sc, Th‒Co‒Zr/10, Th‒Sc‒Zr/10 and <sup>87</sup>Sr/<sup>86</sup>Sr of a sample indicated that the terrigenous detritus of the sample mainly came from the South Qinling active continental margin, rather than the weathering of Emeishan basalt. Acid bentonite came from the Paleo-Tethys island arc or the island arc formed by the subduction of the South China Plate beneath the North China Plate, rather than the ELIP. This evidence supported the view that the North China Plate potentially collided with the South China Plate in middle to late Wujiaping.</p>\",\"PeriodicalId\":9612,\"journal\":{\"name\":\"Carbonates and Evaporites\",\"volume\":\"38 1\",\"pages\":\"\"},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2024-03-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Carbonates and Evaporites\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1007/s13146-024-00934-9\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbonates and Evaporites","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s13146-024-00934-9","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOLOGY","Score":null,"Total":0}
Geochemistry of the Guadalupian—Lopingian carbonate rocks from the NE Sichuan Basin, China: implications for paleo-oceanic environment and provenance
As the last part of the Hercynian cycle in the Yangtze region, the Dongwu Movement included the eruption of the Emeishan large igneous province (ELIP) and was an essential event between the Guadalupian and Lopingian, which had significant implications for the paleo-oceanic environment and paleoclimate of the area. To study the changes in the sedimentary environment in the Guadalupian and Lopingian, the Zhenba section was selected, and its trace elements and rare earth elements (REEs) were analyzed. From analysis of the trace elements and REEs in the Guadalupian, the limestone samples had prominent typical shallow-water seawater deposition characteristics and were less affected by terrigenous detritus, which was in an arid oxidation environment; Sr/Cu ranged from 4 to 1381, the Rb/Sr value was low, δCe < 1, Ceanom < −0.1, Er/Nd ranged from 0.1 to 0.27, and Y/Ho ranged from 44 to 72. However, in the Lopingian, the limestone samples were more affected by terrigenous detritus, which was in a humid climate with a weak oxidation‒reduction environment; the Sr/Cu ranged from 1 to 656, the Rb/Sr value was high, δCe ≅ 1, Ceanom ≥ −0.1, Er/Nd < 0.1, and Y/Ho ranged from 26 to 44. The geochemical diagrams of TiO2‒Al2O3, Al2O3‒REE, La‒Th‒Sc, Th‒Co‒Zr/10, Th‒Sc‒Zr/10 and 87Sr/86Sr of a sample indicated that the terrigenous detritus of the sample mainly came from the South Qinling active continental margin, rather than the weathering of Emeishan basalt. Acid bentonite came from the Paleo-Tethys island arc or the island arc formed by the subduction of the South China Plate beneath the North China Plate, rather than the ELIP. This evidence supported the view that the North China Plate potentially collided with the South China Plate in middle to late Wujiaping.
期刊介绍:
Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability.
The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.