Formation and Palaeozoic evolution of the Gorny-Altai-Altai-Mongolia suture zone (South Siberia): zircon U/Pb constraints on the igneous record
Formation and Palaeozoic evolution of the Gorny-Altai-Altai-Mongolia suture zone (South Siberia): zircon U/Pb constraints on the igneous record
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DOI：
10.1016/j.gr.2011.03.003
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发表时间：
2011-09
影响因子：
6.1
通讯作者：
S. Glorie;J. Grave;M. Buslov;F. Zhimulev;A. Izmer;Willem Vandoorne;A. Ryabinin;P. Haute;F. V
中科院分区：
文献类型：
--
作者：
S. Glorie;J. Grave;M. Buslov;F. Zhimulev;A. Izmer;Willem Vandoorne;A. Ryabinin;P. Haute;F. V
阿尔泰-萨彦褶皱带是古生代岛弧陆壳对古欧亚大陆生长的缩影。它的形成是由古亚洲洋（PAO）的关闭时，岛弧系统和冈瓦纳派生的碎屑增生到西伯利亚边缘。PAO相关构造单元和相关花岗岩类遗迹沿着戈尔内-阿尔泰和阿尔泰-蒙古之间的蛇绿质Charysh-Terekta-Ulagan-Sayan缝合线（CTUSs）分布。锆石LA-ICP-MS U/Pb定年结果表明，PAO的演化具有多阶段性。西伯利亚边缘的原始库兹涅茨克-阿尔泰岛弧地壳形成于埃迪卡拉纪-早寒武世（525- 555 Ma）。该岛弧在中-晚寒武世（~ 510 Ma）成熟，在晚寒武世-早奥陶世（480- 490 Ma）被PAO俯冲作用所吞没，形成西伯利亚早加里东期增生碰撞带。在CTUSs南部，花岗岩岩浆作用发生在冈瓦纳起源的阿尔泰-蒙古中晚奥陶世（450- 470 Ma）古哈萨克斯坦组合和志留纪-早泥盆世（400- 425 Ma）安第斯型碰撞期间。中晚泥盆世（360- 395 Ma）花岗岩类是阿尔泰-蒙古与西伯利亚碰撞的产物。在最后的泛古陆合并过程中，缝合线被走滑重新激活（相关的岩浆活动~ 295 Ma）。最年轻的（220- 255 Ma）花岗岩类样品起源于板内环境。
The Altai-Sayan Fold Belt epitomises how Phanerozoic island-arc continental crust contributed to the growth of the Palaeo-Eurasian continent. Its formation is dominated by the closure of the Palaeo-Asian Ocean (PAO) when island-arc systems and Gondwana-derived terranes accreted to the Siberian margin. Relics of the PAO related tectonic units and associated granitoids occur along the ophiolitic Charysh–Terekta–Ulagan–Sayan suture (CTUSs) between Gorny-Altai and Altai-Mongolia. Zircon LA-ICP-MS U/Pb dating of this igneous record constrains the multi-stage geodynamic PAO evolution. Primitive Kuznetsk-Altai island-arc crust formed at the Siberian margin during the Ediacaran–Early Cambrian (525–555Ma). This island-arc matured during the Middle–Late Cambrian (~510Ma) and was consumed by PAO subduction in the Late Cambrian–Early Ordovician (480–490Ma) forming the Siberian Early Caledonian accretion–collision belt. South of the CTUSs, granitic magmatism occurred within Gondwana-derived Altai-Mongolia during the Middle–Late Ordovician (450–470Ma) Palaeo-Kazakhstan assembly and during a Silurian–Early Devonian (400–425Ma) Andean-type collision. Middle–Late Devonian (360–395Ma) granitoids were emplaced as a result of the collision of Altai-Mongolia with Siberia. During final Pangaea amalgamation, the suture was strike-slip reactivated (associated magmatism ~295Ma). The youngest (220–255Ma) sampled granitoids originated in an intra-plate setting.