Testing models of Late Palaeozoic–Early Mesozoic orogeny in Western Turkey: support for an evolving open-Tethys model
Testing models of Late Palaeozoic–Early Mesozoic orogeny in Western Turkey: support for an evolving open-Tethys model
复制标题
土耳其西部晚古生代-早中生代造山运动的测试模型：支持不断发展的开放特提斯模型
DOI：
10.1144/0016-764903-080
复制
发表时间：
2004
影响因子：
2.7
通讯作者：
J. Dixon
中科院分区：
文献类型：
--
作者：
A. Robertson;T. Ustaömer;E. Pickett;A. Collins;T. Andrew;J. Dixon
来自南北横断面的野外证据测试了土耳其西部特提斯的三种构造模型，即晚古生代海洋闭合和早中生代海洋张开的时间。在模式1中，古生代大洋向南俯冲，从冈瓦纳大陆裂解碎片和打开三叠纪新特提斯向南。晚三叠世发生了闭合和碰撞。在模式2中，一个广泛的古生代特提斯向北俯冲与活动的欧亚大陆边缘和被动的冈瓦纳大陆边缘。冈瓦纳北方边缘在三叠纪断裂;碎片要么留在附近（陶里德斯），要么向北漂移（如卡拉卡亚），附着在北俯冲板块上。新洋壳以新特提斯洋取代古特提斯洋，弧后边缘盆地沿着南欧亚大陆边缘（如库马尔）开放。在模式3中，古生代海洋也向北俯冲，打开广泛的边缘盆地。一条宽阔的南新特提斯山脉沿着冈瓦纳大陆边缘张开。裂欧亚大陆（Anatolides）和冈瓦纳大陆（Taurides）的碎片在中特提斯碰撞的最后三叠世的时间。庞蒂德的实地证据支持北倾俯冲模型（上文模型2或3）。主要特征是与欧亚边缘接壤的向南的高压-低温增生棱镜、岩浆弧和弧后盆地系统。此外，来自Tauride山脉的证据支持模型2而不是模型3。重要的是，阿纳托利德和金牛座似乎有一个共同的历史，不太可能像模型3那样位于特提斯的两侧。
Field evidence from north–south transects tests three tectonic models for Tethys in Western Turkey for when a Late Palaeozoic ocean was closing and an Early Mesozoic ocean opening. In Model 1, a Palaeozoic ocean subducted southwards, rifting continental fragments from Gondwana and opening a Triassic Neo-Tethys to the south. Closure and collision occurred by latest Triassic time. In Model 2, a wide Palaeozoic Tethys subducted northwards with an active Eurasian margin and a passive Gondwana margin. The northern Gondwana margin rifted in the Triassic; fragments either remained nearby (Taurides) or drifted northwards (e.g. Karakaya) attached to a north-subducting plate. New oceanic crust replaced Palaeo-Tethys with Neotethys and back-arc marginal basins opened along the south Eurasian margin (e.g. Küre). In Model 3, a Palaeozoic ocean also subducted northwards opening wide marginal basins. A wide Southern Neotethys opened along the Gondwana margin. Rifted Eurasian (Anatolides) and Gondwana (Taurides) fragments collided in mid-Tethys by latest Triassic time. Field evidence from the Pontides supports north-dipping subduction models (Model 2 or 3 above). Key features are a south-vergent, HP–LT accretionary prism, magmatic arc and back-arc basin system bordering the Eurasian margin. Also, evidence from the Tauride Mountains favours Model 2 over Model 3. Critically, the Anatolides and Taurides appear to have a common history and were unlikely to have been located on opposite sides of Tethys, as in Model 3.