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Provenance analysis of Jurassic basins along Chaling–Chenzhou–Linwu Fault, South China: Implications for palaeogeographic reconstruction and Mesozoic tectonic transition
Geological Journal ( IF 1.4 ) Pub Date : 2020-12-17 , DOI: 10.1002/gj.4060 Xianbing Xu 1 , Chenghua Liang 1 , Jiaju Chen 1 , Yadong Xu 1
Geological Journal ( IF 1.4 ) Pub Date : 2020-12-17 , DOI: 10.1002/gj.4060 Xianbing Xu 1 , Chenghua Liang 1 , Jiaju Chen 1 , Yadong Xu 1
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Tectonic transition from the Tethys to Palaeo‐Pacific regimes occurred during the Mesozoic in the South China Block. But the switching time and palaeogeographic pattern are still controversial. The Late Triassic to Middle Jurassic Longhai and Sandu basins along the NNE‐striking Chaling–Chenzhou–Linwu Fault were selected for provenance analysis and palaeogeographic reconstruction. Detrital zircons of all six samples from the Lower and Middle Jurassic yield peak ages of 250 ~ 400 Ma, 407 ~ 497 Ma, 562 ~ 1,167, 1,603 ~ 2,170 Ma, and 2,270 ~ 2,800 Ma, revealing pre‐Triassic tectono‐thermal events occurred within or beyond the South China Block. Late Triassic (207 ~ 236 Ma) and Early Jurassic (186 ~ 198 Ma) detrital zircons are also preserved in the Lower and Middle Jurassic. Composition and content variations of zircon ages in the Longhai Basin imply Jurassic stratigraphic inversion, which was caused by Middle Jurassic top‐to‐the‐SE thrusting of the Chaling–Chenzhou–Linwu Fault. Cathodoluminescence images, Th/U ratios, and rare earth elements patterns show that almost all analyzed zircons are of magmatic origin. Y versus U/Yb and Nb/Yb versus U/Yb discrimination diagrams indicate that 250 ~ 400 Ma, 207 ~ 250 Ma, and 186 ~ 198 Ma detrital zircons are continental zircons derived from Late Palaeozoic, Triassic, and Early Jurassic continental arcs, respectively. Provenance analysis indicate that the Middle and Lower Jurassic in the Longhai Basin were derived from the Nanling tectonic belt to the south, whereas the Lower Jurassic in the Sandu Basin from the Wuyishan domain to the east. The source‐to‐sink systems indicate that an NNE‐striking watershed occurred during Early to Middle Jurassic and separated the Longhai and Sandu basins. Tectonic uplift of the NNE‐striking watershed resulted from by Late Triassic transpression along the Chaling–Chenzhou–Linwu Fault. Combining these with two‐stage tectonic deformation and granitoids in the South China Block, the Mesozoic tectonic transition from the Tethys regime to the Palaeo‐Pacific regime occurred during the Late Triassic.
中文翻译：
华南茶陵—hen州—临武断裂带侏罗系盆地物源分析：对古地理重建和中生代构造转换的启示
从特提斯时代到古太平洋时代的构造过渡发生在华南地块的中生代。但是转换时间和古地理格局仍存在争议。选择沿北北东向的茶陵—hen州—临武断裂的晚三叠世—中侏罗纪龙海盆地和三都盆地进行物源分析和古地理重建。侏罗纪中，下侏罗统屈服峰年龄250〜400 Ma，407〜497 Ma，562〜1,167，1,603〜2,170 Ma和2,270〜2,800 Ma的全部六个样品的碎屑锆石，揭示了三叠纪前构造热事件的发生。华南街区之内或之外。下侏罗纪和中侏罗世也保留了晚三叠世（207〜236 Ma）和侏罗纪早期（186〜198 Ma）碎屑锆石。龙海盆地锆石年龄的组成和含量变化暗示了侏罗纪地层倒转，这是由茶陵—hen州—临武断裂的中侏罗世上-东南向逆冲作用引起的。阴极发光图像，Th / U比和稀土元素模式表明，几乎所有分析的锆石都是岩浆成因的。Y对U / Yb和Nb / Yb对U / Yb的判别图表明，碎屑锆石为250〜400 Ma，207〜250 Ma和186〜198 Ma，是源自古生代晚期，三叠纪和侏罗纪早期大陆弧的大陆性锆石，分别。物源分析表明，龙海盆地的中侏罗纪是南缘南岭构造带，而三毒盆地的下侏罗纪是武夷山地区的东部。源-汇系统表明，在侏罗纪早期至中侏罗世期间发生了一次近东近海碰撞分水岭，并分隔了龙海盆地和三都盆地。沿茶陵—hen州—临武断裂的晚三叠世反压造成了北北东向分水岭的构造抬升。结合华南地区的两阶段构造变形和花岗岩体，晚三叠世发生了从特提斯政权向古太平洋政权的中生代构造过渡。
更新日期：2020-12-17
中文翻译：
华南茶陵—hen州—临武断裂带侏罗系盆地物源分析：对古地理重建和中生代构造转换的启示
从特提斯时代到古太平洋时代的构造过渡发生在华南地块的中生代。但是转换时间和古地理格局仍存在争议。选择沿北北东向的茶陵—hen州—临武断裂的晚三叠世—中侏罗纪龙海盆地和三都盆地进行物源分析和古地理重建。侏罗纪中，下侏罗统屈服峰年龄250〜400 Ma，407〜497 Ma，562〜1,167，1,603〜2,170 Ma和2,270〜2,800 Ma的全部六个样品的碎屑锆石，揭示了三叠纪前构造热事件的发生。华南街区之内或之外。下侏罗纪和中侏罗世也保留了晚三叠世（207〜236 Ma）和侏罗纪早期（186〜198 Ma）碎屑锆石。龙海盆地锆石年龄的组成和含量变化暗示了侏罗纪地层倒转，这是由茶陵—hen州—临武断裂的中侏罗世上-东南向逆冲作用引起的。阴极发光图像，Th / U比和稀土元素模式表明，几乎所有分析的锆石都是岩浆成因的。Y对U / Yb和Nb / Yb对U / Yb的判别图表明，碎屑锆石为250〜400 Ma，207〜250 Ma和186〜198 Ma，是源自古生代晚期，三叠纪和侏罗纪早期大陆弧的大陆性锆石，分别。物源分析表明，龙海盆地的中侏罗纪是南缘南岭构造带，而三毒盆地的下侏罗纪是武夷山地区的东部。源-汇系统表明，在侏罗纪早期至中侏罗世期间发生了一次近东近海碰撞分水岭，并分隔了龙海盆地和三都盆地。沿茶陵—hen州—临武断裂的晚三叠世反压造成了北北东向分水岭的构造抬升。结合华南地区的两阶段构造变形和花岗岩体，晚三叠世发生了从特提斯政权向古太平洋政权的中生代构造过渡。
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