北美中大陆两阶段格伦维利构造反转后的十亿年稳定性

IF 3.3 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Tectonics Pub Date : 2024-09-19 DOI:10.1029/2024tc008415
Eben B. Hodgin, Nicholas L. Swanson-Hysell, Andrew R. C. Kylander-Clark, Andrew C. Turner, Daniel A. Stolper, Daniel E. Ibarra, Mark D. Schmitz, Yiming Zhang, Luke M. Fairchild, Anthony J. Fuentes
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引用次数: 0

摘要

北美克拉通内部保留了近地表过程的 1 Ga 历史,为目前关于与远场造山运动相关的大陆尺度变形和侵蚀的时间和驱动因素的争论提供了信息。我们在威斯康星州北部沿道格拉斯断层(DF)的中大陆裂谷的一个主要地段测试了各种结构反演模型,该地段的总垂直位移达≳10 km。来自悬壁的U-Pb锆石和矿脉方解石Δ47/U-Pb热年代测定法将大部分隆起(≳8.5千米)和变形推定为格伦维利造山运动奥塔旺阶段的1052-1036Ma。综合U-Pb锆石日期、Δ47/U-Pb方解石热时序测定法以及记录了脚壁同步变形到沉积后早期变形的野外数据,可以推断出在格勒维利造山运动的里戈莱特阶段,大约在995-980 Ma发生了第二阶段的隆起(1-1.5 km)。阿巴拉契亚远场造山运动的一个小阶段与最小的推力重新激活有关。我们的综合分析表明,995-980 Ma 贝菲尔德组是格勒维利期的前陆盆地,其原始厚度比目前保存的厚度大 0.5-2 km。通过量化道格拉斯断层沿线的挠曲荷载和其他沉降机制,我们发现动态沉降机制可能与晚格伦维利期跨洲河流系统的发展相一致。在克拉通内部的这一部分,格伦维利期后的侵蚀(0.5-2 千米)极小,保留了贝菲尔德组和等同的演替,从而限制了可归因于新近纪冰川作用的区域侵蚀程度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
One Billion Years of Stability in the North American Midcontinent Following Two-Stage Grenvillian Structural Inversion
The North American craton interior preserves a >1 Ga history of near surface processes that inform ongoing debates regarding timing and drivers of continental-scale deformation and erosion associated with far-field orogenesis. We tested various models of structural inversion on a major segment of the Midcontinent Rift along the Douglas Fault (DF) in northern Wisconsin, which accommodated ≳10 km of total vertical displacement. U-Pb detrital zircon and vein calcite Δ47/U-Pb thermochronometry from the hanging wall constrain the majority of uplift (≳8.5 km) and deformation to 1052–1036 Ma during the Ottawan phase of the Grenvillian orogeny. Combined U-Pb zircon dates, Δ47/U-Pb calcite thermochronometry, and field data that document syn- to early post-depositional deformation in the footwall constrain a second stage of uplift (1–1.5 km) ca. 995–980 Ma during the Rigolet phase of the Grenvillian orogeny. A minor phase of Appalachian far-field orogenesis is associated with minimal thrust reactivation. Our combined analyses identified the 995–980 Ma Bayfield Group as a Grenvillian foreland basin with an original thickness 0.5–2 km greater than currently preserved. By quantifying flexural loading and other subsidence mechanisms along the Douglas Fault, we identify dynamic subsidence as a mechanism that could be consistent with the development of late-Grenvillian transcontinental fluvial systems. Minimal post-Grenvillian erosion (0.5–2 km) in this part of the craton interior has preserved the Bayfield Group and equivalent successions, limiting the magnitude of regional erosion that can be attributed to Neoproterozoic glaciation.
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来源期刊
Tectonics
Tectonics 地学-地球化学与地球物理
CiteScore
7.70
自引率
9.50%
发文量
151
审稿时长
3 months
期刊介绍: Tectonics (TECT) presents original scientific contributions that describe and explain the evolution, structure, and deformation of Earth¹s lithosphere. Contributions are welcome from any relevant area of research, including field, laboratory, petrological, geochemical, geochronological, geophysical, remote-sensing, and modeling studies. Multidisciplinary studies are particularly encouraged. Tectonics welcomes studies across the range of geologic time.
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