A Vendian-Cambrian Island Arc System of the Siberian Continent in Gorny Altai (Russia, Central Asia)
A Vendian-Cambrian Island Arc System of the Siberian Continent in Gorny Altai (Russia, Central Asia)
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DOI：
10.1016/s1342-937x(05)70913-8
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发表时间：
2002-10
影响因子：
6.1
通讯作者：
M. M. Buslov-M.;Tsuyoshi Watanabe;I. Y. Saphonova;K. Iwata;A. V. Travin;M. Akiyama
中科院分区：
文献类型：
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作者：
M. M. Buslov-M.;Tsuyoshi Watanabe;I. Y. Saphonova;K. Iwata;A. V. Travin;M. Akiyama
在西伯利亚大陆边缘的戈尔尼-阿尔泰地体中描述了一个与伊祖-波宁-马里亚纳类型相似的扩展文纪-寒武纪岛弧体系。识别出地体的三个不同构造阶段。(1)包括古亚洲洋俯冲洋壳、乌门-列别德原始岛弧、洋岛和海山在内的一套海相活动边缘，假定该套岩石形成于文纪。(2)由钙碱性火山和花岗岩组成的更为演化的岛弧：中晚寒武世的弧前槽充满了前中寒武世增生楔和岛弧的破碎产物。(3)较演化的岛弧与西伯利亚大陆碰撞：晚寒武世-早奥陶世发生了花岗岩褶皱、变质和侵入作用。晚古生代，西伯利亚大陆加里东期的吸积碰撞构造被大规模走滑断裂破坏成若干段。这就形成了典型的马赛克砌块结构。
An extended Vendian-Cambrian island-arc system similar to the Izu-Bonin-Mariana type is described in the Gorny Altai terrane at the margin of the Siberian continent. Three different tectonic stages in the terrane are recognized. (1) A set of ensimatic active margins including subducted oceanic crust of the Paleo-Asian ocean, the Uimen-Lebed primitive island arc, oceanic islands and seamounts: the set of rocks is assumed to be formed in the Vendian. (2) A more evolved island arc comprising calc-alkaline volcanics and granites: a fore-arc trough in Middle-late Cambrian time was filled with disrupted products of pre-Middle Cambrian accretionary wedges and island arcs. (3) Collision of the more evolved island arc with the Siberian continent: folding, metamorphism and intrusion of granites occurred in late Cambrian-early Ordovician time. In the late Paleozoic, the above-mentioned Caledonian accretion-collision structure of the Siberian continent was broken by large-scale strike-slip faults into several segments. This resulted in the formation of a typical mosaic-block structure.