• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >New Insights into Arctic Tectonics: Uranium-Lead, (Uranium-Thorium)/Helium, and Hafnium Isotopic Data from the Franklinian Basin, Canadian Arctic Islands.
【24h】

New Insights into Arctic Tectonics: Uranium-Lead, (Uranium-Thorium)/Helium, and Hafnium Isotopic Data from the Franklinian Basin, Canadian Arctic Islands.

机译：北极构造的新见解：来自加拿大北极岛富兰克林盆地的铀铅（铀-hor）/氦和Ha同位素数据。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

More than 2300 detrital zircon uranium-lead (U-Pb) ages, 32 176Hf/177Hf (eHf) isotopic values, 37 apatite helium (AHe) ages, and 72 zircon helium (ZHe) ages represent the first in-depth geochronologic and thermochronologic study of Franklinian Basin strata in the Canadian Arctic and provide new insight on >500 M.y. of geologic history along the northern Laurentian margin (modern orientation). Detrital zircon U-Pb age data demonstrate that the Franklinian Basin succession is composed of strata with three distinctly different provenance signatures. Neoproterozoic and Lower Cambrian formations contain detrital zircon populations consistent with derivation from Archean to Paleoproterozoic gneisses and granites of the west Greenland–northeast Canadian Shield. Lower Silurian to Middle Devonian strata are primarily derived from foreland basin strata of the East Greenland Caledonides (Caledonian orogen). Middle Devonian to Upper Devonian strata also contain detrital zircon populations interpreted as being primarily northerly derived from the continental landmass responsible for the Ellesmerian Orogen (often referred to as Crockerland). U-Pb age data from basal turbidites of the Middle to Upper Devonian clastic succession suggest Crockerland contributed sediment to the northern Laurentian margin by early-Middle Devonian time and that prior to the Ellesmerian Orogeny Crockerland had a comparable geologic history to the northern Baltica Craton. Detrital zircon U-Pb ages in Upper Devonian strata suggest Crockerland became the dominant source by the end of Franklinian Basin sedimentation.;Mean eHf values from Paleozoic detrital zircon derived from Crockerland suggest the zircons were primarily formed in either an island arc or continental arc built on accreted oceanic crust setting. ZHe cooling ages from Middle and Upper Devonian strata were not buried deeper than 7 km since deposition and suggest Crockerland was partially exhumed during the Caledonian Orogen. AHe cooling ages are partially reset since deposition and experienced varying burial histories depending on stratigraphic and geographic location within the basin. AHe ages from Middle Devonian strata from the western margin of the basin indicate episodes of exhumation associated with clastic influxes of sediment into the Sverdrup Basin during the Late Jurassic-Early Cretaceous and Late Cretaceous.
机译：超过2300个碎屑锆石铀-铅（U-Pb）年龄，32 176Hf / 177Hf（eHf）同位素值，37个磷灰石氦（AHe）年龄和72个锆石氦（ZHe）年龄是第一个深入的年代学和热年代学对加拿大北极地区富兰克林盆地地层的研究，为> 500 My提供了新的见解劳伦山脉北部边缘的地质历史（现代方向）。碎屑锆石U-Pb年龄数据表明，富兰克林盆地演替是由具有三个明显不同物源特征的地层组成的。新元古代和下寒武统地层中的碎屑锆石数量与从格陵兰至古元古代的片麻岩和西格陵兰岛-加拿大东北部盾构的花岗岩一致。下志留纪至中泥盆纪地层主要来源于东格陵兰喀里多尼德（卡莱多期造山带）前陆盆地地层。中泥盆纪至上泥盆统地层也含有碎屑锆石，这些碎屑锆石被解释为主要来自负责Ellesmerian造山带（通常被称为Crockerland）的大陆陆块的北部。中泥盆世至上泥盆世碎屑演替的基体浊积的U-Pb年龄数据表明，泥盆纪到泥盆纪中期之前，克罗克兰对劳伦山脉的北部贡献了沉积物，而埃尔勒斯造山运动之前的克罗克兰德的地质历史与波罗的海克拉通北部具有相似的地质历史。泥盆纪上地层的碎屑锆石U-Pb年龄表明克罗克兰成为富兰克林盆地沉积末期的主要来源。;源自克罗克兰的古生代碎屑锆石的平均eHf值表明，锆石主要形成于岛屿弧或大陆弧中在增生的洋壳环境中。自沉积以来，中泥盆纪和上泥盆统地层的冷却年龄没有被埋藏超过7 km，这表明克利克兰在加里东造山带期间被部分掘出。自沉积以来，由于盆地内地层和地理位置的不同，埋葬历史经历了不同的埋葬历史，部分冷却时间被重置。盆地西部边缘的泥盆纪中层地层的AHe年龄表明侏罗纪-早白垩纪和白垩纪晚期与碎屑涌入Sverdrup盆地有关。

著录项

  • 作者

    Anfinson, Owen Anthony.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Geology.;Geochemistry.;Plate Tectonics.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 180 p.
  • 总页数 180
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号