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首页> 外文期刊>GSA Bulletin >Mesozoic sedimentary-basin development on the allochthonous Wrangellia composite terrane, Wrangell Mountains basin, Alaska: A long-term record of terrane migration and arc construction
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Mesozoic sedimentary-basin development on the allochthonous Wrangellia composite terrane, Wrangell Mountains basin, Alaska: A long-term record of terrane migration and arc construction

机译：阿拉斯加弗兰吉尔山脉盆地异源弗兰吉利亚复合地层中生界沉积盆地发育：长期的地层迁移和弧形构造记录

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摘要

The 7000 m of Upper Triassic–Upper Cretaceous strata of the Wrangell Mountains basin depositionally overlie the allochthonous Wrangellia composite terrane in south-central Alaska. New sedimentologic, compositional, and geochronologic data from these strata provide a record of the migration of the terrane from an intraoceanic setting at low paleolatitudes (12°N) to its present position along the continental margin of southern Alaska (61°N). We recognize several distinct stages of basin development: (1) Upper Triassic–Lower Jurassic carbonate strata represent an intraoceanic carbonate platform built on a remnant volcanic arc at low paleolatitudes (12°N). (2) During the Middle to Late Jurassic, a subduction zone formed along the southern margin of the Wrangellia composite terrane, prompting development of an intraoceanic arc and backarc basin on top of the terrane. (3) A narrow thrust belt and retroarc foreland basin formed along the inboard margin of the arc during the latest Jurassic. The foreland basin and arc were subsequently folded, uplifted, and eroded during the latest Jurassic–Early Cretaceous as recorded by an angular unconformity and isotopic ages from clasts in conglomerate. Regional deformation of the foreland-basin strata, shortening and uplift of the Wrangellia composite terrane, and uplift and erosion of the Middle to Late Jurassic arc are interpreted to represent the initial collision between the terrane and the continental margin of western North America. (4) Following regional deformation, a new volcanic arc was constructed inboard (northward) of the Wrangell Mountains basin. Upper Lower to Upper Cretaceous siliciclastic strata were deposited by shallow- to deep-marine deposystems in a continental-margin forearc basin. Distributions of lithofacies types and formation-thickness changes across intrabasinal normal faults document synextensional deposition. (5) The final stage of basin development was characterized by shortening and coarse-grained sedimentation along a fault system that separated the trenchward (southern) margin of the forearc basin from the subduction complex. (6) The Wrangell Mountains basin arrived at its current position by northward translation along orogen-parallel strike-slip fault systems.
机译：Wrangell山脉盆地上三叠统-上白垩统地层7000 m沉积在阿拉斯加中南部的Allangthonous Wrangellia复合地层上。来自这些地层的新的沉积学， 和地质年代学数据提供了 在低纬度下从海内 设置的地层迁移的记录（12 °N）到阿拉斯加南部大陆边缘（61°N）的当前位置 。 我们认识到盆地发育的几个不同阶段：（1） < / sup>上三叠世-下侏罗统碳酸盐岩地层表示 在低古纬度（12°N）上残留的火山 弧上建造的大洋内部碳酸盐台地。 （2）在侏罗纪中段至晚侏罗世期间，在Wrangellia复合地层的南部 边缘形成了一个俯冲带，促使大洋内部发育 。 （3）在最近的侏罗纪期间，沿弧的内侧边缘形成了一条狭窄的逆冲带和弧后前陆盆地。 > 随后，在最近的侏罗纪-早白垩世 期间，前陆盆地和弧线被折叠，抬升， 并侵蚀，从< sup> 在大企业中破灭。前陆盆地 地层的区域变形，Wrangellia复合地层的缩短和隆升， 和侏罗系中晚期到晚期的隆升和侵蚀是 解释为代表 地形与北美西部大陆边缘之间的初始碰撞。 （4）随着 区域变形，在弗兰格尔山脉盆地的 （向北）内侧构造了一个新的火山弧。上缘至白垩纪硅质碎屑岩地层是由浅层 沉积到陆缘前陆盆地的深海沉积系统中。 岩相类型的分布整个基底内正常断裂的地层和厚度变化 记录了共伸展沉积。 （5）盆地发育的最后阶段以 缩短和粗化为特征。沿断层系统 的颗粒状沉积，将前臂 盆地的向南（南部）边缘与俯冲带分开。 （6）朗格山脉 盆地通过造山带平行走滑断裂系统的北移 到达其当前位置。

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  • 来源
    《GSA Bulletin》 |2002年第6期|693-717|共25页
  • 作者

    Jeffrey M. Trop; Kenneth D. Ridgway; Jeffrey D. Manuszak; Paul Layer;

  • 作者单位

    Department of Geology, Bucknell University, Lewisburg, Pennsylvania 17837, USA;

    Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA;

    Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA;

    Geophysical Institute, University of Alaska, Fairbanks, Alaska 99775, USA;

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