An accreted micro-continent in the north of the Dabie Orogen, East China: Evidence from detrital zircon dating
An accreted micro-continent in the north of the Dabie Orogen, East China: Evidence from detrital zircon dating
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中国东部大别造山带北部的增生微大陆：来自碎屑锆石测年的证据
DOI：
10.1016/j.tecto.2017.01.004
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发表时间：
2017-02
期刊：
影响因子：
2.9
通讯作者：
Yunjian Li
中科院分区：
文献类型：
--
作者：
Guang Zhu;Yongsheng Wang;Wei Wang;Shuai Zhang;Cheng Liu;Chengchuan Gu;Yunjian Li
华北陆块与华南陆块在三叠纪发生了沿着秦岭-桐柏-红安-大别造山带的陆-陆碰撞。在北方秦岭-桐柏造山带中发现了一个具有古生代岛弧岩浆活动的微大陆，但该微大陆是否延伸至大别造山带形成带状微大陆，由于后来被北部合肥盆地掩埋，目前尚不清楚。为解决这一问题，对盆地南缘志留系-白垩系砂岩和火山岩进行了LA-ICP-MS锆石U-Pb年龄测定。碎屑锆石年龄谱表明，大别造山带和后期盆地盖层是砂岩的源区。碎屑锆石和继承锆石指示了大别造山带北部北淮阳单元新元古代、早古生代和晚古生代的岩浆活动。锆石和以往地球物理资料表明，北起肥中缝合带，南至晓天-磨子塘缝合带的微大陆存在于华北板块与三叠纪大别造山带之间，其北方被侏罗纪-古近纪合肥盆地所掩埋。北淮阳微大陆经历了由二郎坪洋壳向南俯冲引起的早古生代岛弧岩浆活动和与古特提斯洋壳向北俯冲有关的晚古生代岩浆活动。在早泥盆世末，微大陆增生到NCB的南部边缘（约100万年）。400 Ma），是弧-陆碰撞的产物。与秦岭-桐柏造山带相似，大别造山带北部为古生代增生体系，南部为三叠纪碰撞体系，因此，在中古生代以前，沿整个秦岭-桐柏-红安-大别造山带存在一个沿着长900 km，宽50-100 km的带状微大陆。该微大陆可能是新元古代中期沿华南板块边缘沿着裂谷作用的产物。
Continent–continent collision between the North China Block (NCB) and South China Block (SCB) took place along the Qinling–Tongbai–Hong'an–Dabie orogens during the Triassic. A micro-continent with Paleozoic arc magmatism has been recognized in the northern Qinling–Tongbai orogens; however, it remains unclear whether the micro-continent extended to the Dabie Orogen to form a ribbon-shaped micro-continent, due to later burial by the Hefei Basin in the north. To solve this problem, we conducted LA–ICP–MS Usingle bondPb dating of zircons from Silurian to Cretaceous sandstones and volcanic rocks from the southern margin of the basin. The age spectra of detrital zircons suggest that the Dabie Orogen and later basin cover were the sources of the analyzed sandstones. The detrital and inherited zircons indicate Neoproterozoic, early and late Paleozoic magmatism in the Beihuaiyang unit in the north of the Dabie Orogen. The zircon and previous geophysical data show that a micro-continent bounded by the Feizhong Suture in the north and the Xiaotian–Mozitang Suture in the south existed between the NCB and the Triassic Dabie Orogen, and its northern half is buried by the Jurassic–Paleogene Hefei Basin. The Beihuaiyang micro-continent experienced early Paleozoic arc magmatism caused by southward subduction of the Erlangping oceanic crust and late Paleozoic magmatism related to northward subduction of the Paleotethyan oceanic crust. The micro-continent was accreted to the southern edge of the NCB at the end of the Early Devonian (ca. 400 Ma) via arc–continent collision. Similarly to the Qinling–Tongbai orogens, the Dabie Orogen contains a Paleozoic accretionary system in the north and a Triassic collisional system in the south; thus, it is suggested that a ribbon-shaped micro-continent, > 900 km long and 50–100 km wide, was present along the entire Qinling–Tongbai–Hong'an–Dabie orogens prior to the middle Paleozoic. This micro-continent might have originated as a result of middle Neoproterozoic rifting along the margin of the SCB.
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