Petrochronology with Th-U-Pb monazite dating in the Zone of Erbendorf-Vohenstrauß (Saxothuringian Allochthon, NE-Bavaria)

Erbendorf-Vohenstrauí 地区（萨克森林阶 Allochthon，巴伐利亚东北部）的 Th-U-Pb 独居石岩石年代学

• 批准号: 499366296
• 负责人: Professor Dr. Bernhard Schulz
• 金额: --
• 依托单位: Institut für Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/499366296?language=en
• 关键词: Petrochronology; Th; Pb; monazite; dating

The Zone of Erbendorf-Vohenstrauß (ZEV) at the western margin of the Bohemian Massif is part of the Upper Allochthonous Domain in the Saxothuringian Zone of the Variscan Orogen. The ZEV and the adjacent Moldanubian Zone with their metamorphic and magmatic rocks were the target region of the Continental Deep Drilling Program (KTB). Intense geological-petrological and radiochronological (U-Pb zircon, K-Ar, Ar-Ar, Rb-Sr) have been performed there previous to 1995. Carboniferous, Devonian and Ordovician metamorphic events have been reported from the region. The Th-U-Pb dating of the accessory mineral monazite ((LREE, Th, U, Si, Ca)PO4) by electron probe microanalyser (EPMA-Th-U-Pb) in micaschists and orthogneisses now will be newly applied there. This method allows to resolve several thermal events in polymetamorphic terrains. By the in situ analysis of monazite in microstructures, analysis of Y in garnet by LA-ICP-MS and geothermobarometry, distinct segments of the pressure-temperature (P-T) paths can be related to time sections in single samples (Petrochronology). Particularly the distribution and character of the Ordovician metamorphism previous to the Variscan continental collision is a target of the investigation.

波希米亚地块西缘的 Erbendorf-Vohenstrauß 地带 (ZEV) 是瓦里西亚造山带 Saxothuringian 地带上异地域的一部分，ZEV 和邻近的摩尔达努比亚地带及其变质岩和岩浆岩是目标区域。大陆深钻计划（KTB）的强化地质岩石学和放射年代学（U-Pb 锆石， K-Ar、Ar-Ar、Rb-Sr）已在 1995 年之前进行过。该地区已报告了石炭纪、泥盆纪和奥陶纪变质事件。对副矿物独居石（（LREE，现在将在云母岩和正片麻岩中通过电子探针微量分析仪（EPMA-Th-U-Pb）进行Th、U、Si、Ca)PO4）的新应用。该方法可以解决多变质地形中的多个热事件，通过对独居石的微观结构进行原位分析，通过 LA-ICP-MS 和地温压测量法对石榴石中的 Y 进行分析，可以将压力-温度 (P-T) 路径的不同部分关联起来。单个样本的时间剖面（岩石年代学），特别是瓦里斯大陆碰撞之前奥陶纪变质作用的分布和特征是研究的目标。