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Geochemistry and geochronology of Upper Triassic sedimentary rocks from the south of the Dabie Orogen: Implications for the paleoenvironment, provenance and tectonic setting
Geological Journal ( IF 1.4 ) Pub Date : 2023-10-03 , DOI: 10.1002/gj.4884 Tian Zhao 1, 2 , Huifeng Hu 1 , Run Zhan 2 , Jingjie Zhang 3 , Guilin Lai 4 , Jiayi Gu 1 , Feiyang Tian 1 , Gang Wang 1 , Yingming Liu 1 , Yuye Liu 1
Geological Journal ( IF 1.4 ) Pub Date : 2023-10-03 , DOI: 10.1002/gj.4884 Tian Zhao 1, 2 , Huifeng Hu 1 , Run Zhan 2 , Jingjie Zhang 3 , Guilin Lai 4 , Jiayi Gu 1 , Feiyang Tian 1 , Gang Wang 1 , Yingming Liu 1 , Yuye Liu 1
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The formation and evolution of the foreland basin in the south of the Dabie Orogen are both closely related to the uplift of the orogenic belt. However, the Late Triassic paleoenvironment and the provenance of the sediments in the foreland basin remain controversial. Nine samples from the Upper Triassic Puqi Group of the foreland basin were analysed for whole-rock major and trace elements and three sandstone samples were selected for zircon dating by U–Pb laser ablation inductively coupled plasma mass spectrometry. The concentrations of some major (e.g., CaO and Na2O) and trace (e.g., Rb, Sr and Ba) elements varied over a large range and showed different degrees of depletion. A series of major and trace element indicators, as well as the patterns of the rare earth elements, suggested derivation from felsic igneous rocks. The Late Triassic experienced fluctuations between cold warm climates, as indicated by the chemical weathering index ranging from 51.33 to 88.65. The CaO/(FeO + CaO), Rb/Sr and Ba/K ratios indicated that the paleosalinity changed from high to low. The Fe2O3/FeO, U/Th, V/Cr and Ni/Co ratios indicated an oxidizing sedimentary environment. The cathodoluminescence images, Th/U ratios and rare earth elements patterns of the detrital zircons all indicated a magmatic origin. Three samples showed significant peak ages of 224, 440, 748, 1870 and 2492 Ma, corresponding to the development of the Dabie Orogen. Our comprehensive analyses suggest that the Upper Triassic Puqi Group was formed by deposition during continental–continental collision. The Dabie Orogen was exhumed in the Late Triassic and supplied detrital sediments to the foreland basin.
中文翻译：
大别造山带南部上三叠统沉积岩的地球化学和年代学：对古环境、物源和构造环境的启示
大别造山带南部前陆盆地的形成和演化都与造山带的隆升密切相关。然而，晚三叠世的古环境和前陆盆地沉积物的物源仍存在争议。对前陆盆地上三叠统普齐群9个样品进行了全岩主量和微量元素分析，并选取3个砂岩样品进行了U-Pb激光烧蚀电感耦合等离子体质谱锆石定年。一些主要物质（例如 CaO 和 Na 2O）和痕量（例如，Rb、Sr和Ba）元素在很大范围内变化并且表现出不同程度的贫化。一系列主量和微量元素指标以及稀土元素的模式表明源自长英质火成岩。晚三叠世经历了冷暖气候的波动，化学风化指数为51.33至88.65。CaO/(FeO+CaO)、Rb/Sr和Ba/K比值表明古盐度由高到低变化。三氧化二铁/FeO、U/Th、V/Cr 和 Ni/Co 比率表明氧化沉积环境。碎屑锆石的阴极发光图像、Th/U比值和稀土元素模式均表明其为岩浆成因。三个样品显示出显着的峰值年龄，分别为224、440、748、1870和2492 Ma，对应于大别造山带的发育。综合分析认为，上三叠统普齐群是陆陆碰撞沉积形成的。大别造山带在晚三叠世被挖掘出来，为前陆盆地提供碎屑沉积物。
更新日期：2023-10-04
中文翻译：
大别造山带南部上三叠统沉积岩的地球化学和年代学：对古环境、物源和构造环境的启示
大别造山带南部前陆盆地的形成和演化都与造山带的隆升密切相关。然而，晚三叠世的古环境和前陆盆地沉积物的物源仍存在争议。对前陆盆地上三叠统普齐群9个样品进行了全岩主量和微量元素分析，并选取3个砂岩样品进行了U-Pb激光烧蚀电感耦合等离子体质谱锆石定年。一些主要物质（例如 CaO 和 Na 2O）和痕量（例如，Rb、Sr和Ba）元素在很大范围内变化并且表现出不同程度的贫化。一系列主量和微量元素指标以及稀土元素的模式表明源自长英质火成岩。晚三叠世经历了冷暖气候的波动，化学风化指数为51.33至88.65。CaO/(FeO+CaO)、Rb/Sr和Ba/K比值表明古盐度由高到低变化。三氧化二铁/FeO、U/Th、V/Cr 和 Ni/Co 比率表明氧化沉积环境。碎屑锆石的阴极发光图像、Th/U比值和稀土元素模式均表明其为岩浆成因。三个样品显示出显着的峰值年龄，分别为224、440、748、1870和2492 Ma，对应于大别造山带的发育。综合分析认为，上三叠统普齐群是陆陆碰撞沉积形成的。大别造山带在晚三叠世被挖掘出来，为前陆盆地提供碎屑沉积物。
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