Tectonic accretion of the Rheno-Hercynian foreland, documented by detrital zircons in the Carboniferous flysch of the Rheinisches Schiefergebirge (Variscides, Germany)

莱诺-海西前陆的构造增生，由莱茵石峰山石炭纪复理石中的碎屑锆石记录（德国瓦里西德斯）

• 批准号: 299181892
• 负责人: Professor Dr. Wolfgang Franke
• 金额: --
• 依托单位: Geowissenschaftliches Zentrum (GZG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/299181892?language=en
• 关键词: Tectonic; accretion; Rheno; Hercynian; foreland

The active, southern margin of the Rheno-Hercynian Orogen has accreted, at least from the Namurian C onwards, Devonian clastic shelf sediments with zircons derived from the Caledonides and the East European Platform. In Tournaisian to mid-Viséan greywacke turbidites from the Rheno-hercynian allochthons (Hörre, Kellerwald), these zircons are not yet detectable.Laser-ICP-MS dating of zircons from synorogenic turbidites of the missing interval (late Viséan to Namurian B of the autochthon) is expected to reveal the onset of accretion and erosion of north-derived Devonian clastic sediments. Zircon data will be controlled by K/Ar dating of slates from potential source rocks.Previous studies on the mineral composition of Rheno-Hercynian synorogenic clastic sediments permits to estimate the proportion of recycled shelf deposits. Since contours and isopachs of the foreland basin are well-known, the above findings can be used to balance the volume and section of the recycled sediments. That section must be added to the passive margin of Laurussia + Avalonia in order to achieve an improved palispastic reconstruction.

活动的，南部边缘的Rheno-Hercynian造山带增生，至少从纳穆里阶C向前，泥盆纪碎屑陆棚沉积物与锆石来自加里东期和东欧平台。在来自Rheno-hersynian外来岩（Hörre、Kellerwald）的Tournaisian至Viséan中期杂砂岩浊积岩中，这些锆石尚未被检测到。对缺失区间（Viséan晚期至Namurian B期的原地岩）的同造山浊积岩中的锆石进行激光ICP-MS测年，有望揭示北源泥盆纪碎屑沉积物的增生和侵蚀的开始。锆石数据将由来自潜在源岩的板岩的K/Ar定年控制。以前对Rheno-Hercynian同造山碎屑沉积物的矿物组成的研究允许估计再循环陆棚沉积物的比例。由于前陆盆地的等高线和等厚线是众所周知的，上述发现可以用来平衡再循环沉积物的体积和截面。该部分必须添加到Laurussia + Avalonia的被动边缘，以实现更好的Palispastic重建。

项目成果

Zircons to the front: accretionary history of the Rheno-Hercynian active margin (Variscides, Germany)

• DOI: 10.1139/cjes-2018-0255
• 发表时间: 2019-12
• 期刊: Canadian Journal of Earth Sciences
• 影响因子: 1.4
• 作者: W. Franke;H. Huckriede;P. O’Sullivan;K. Wemmer