Subduction, exhumation, and resubduction in the Scandinavian Caledonides: studying the deep levels of a Himalaya-type orogen

斯堪的纳维亚喀里多尼亚山脉的俯冲、折返和再俯冲：研究喜马拉雅型造山带的深层

• 批准号: 278013876
• 负责人: Professor Dr. Nikolaus Froitzheim
• 金额: --
• 依托单位: Arbeitsgruppe Strukturgeologie
• 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 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/278013876?language=en
• 关键词: Subduction; exhumation; resubduction; Scandinavian; Caledonides

The Scandinavian Caledonides are a collisional orogen comparable to the present-day Himalaya but deeply eroded since their formation in the Paleozoic. Therefore, deep levels of the mountain belt can be directly studied in the field and complemented with surface and geophysical information from present-day mountain belts into a more complete picture of Himalaya-type collisional mountain-building. The Seve Nappe Complex, an assemblage of thrust sheets from the outer part of the Baltoscandian margin, emplaced towards east over Baltica during the collision with Laurentia at ca. 400 Ma and cropping out over a distance of ca. 1000 km in Sweden and Norway, has most recently been established as an ultrahigh-pressure (UHP) metamorphic terrane by thermobarometry and the finding of microdiamond inclusions. UHP metamorphism in the Seve probably occurred in the Late Ordovician (ca. 460 to 450 Ma), earlier than the UHP metamorphism of the structurally deeper Western Gneiss Complex (ca. 420 to 400 Ma). As a working hypothesis, Seve UHP rocks formed in an arc-continent collision, were exhumed by extraction of the forearc lithosphere block, partly resubducted together with the Western Gneiss Complex during Baltica-Laurentia collision, and exhumed again by extraction of the Iapetus oceanic slab. Analogue processes in the Himalaya would encompass the collision of India with the Kohistan-Ladakh arc and UHP metamorphism in Indian margin rocks, their exhumation by extraction of the overlying mantle wedge, and the presently ongoing subduction of Indian crust to UHP depths, not accessible to direct observation. We will test the hypothesis using the following methods: structural and microstructural work on the HP and UHP units of the Seve in order to establish the deformation history of the terrane; Lu-Hf garnet dating of eclogites; U-Pb zircon dating of exhumation-related melts and pre-, syn-, and posttectonic dikes; step-wise retrodeformation of four cross-sections across the Scandinavian Caledonides.

斯堪的纳维亚喀里多尼山脉是一种与当今喜马拉雅山相媲美的碰撞造孔，但自从它们在古生代形成以来就深受侵蚀。因此，可以直接在田野中研究深层的山带，并与当今的山带的地面和地球物理信息相辅相成，到喜马拉雅型碰撞山区建设的更完整的图片。 Seve Nappe综合体是一块来自Baltoscandian边缘外部的推力板的组合，在与CA的Laurentia碰撞时，朝向Baltica的东部朝东。 400 mA，在距离内裁剪。在瑞典和挪威的1000公里，最近已通过热型测定法和微足体夹杂物的发现确立为超高压（UHP）变质地层。 SEVE中的UHP变质发生可能发生在晚期的奥陶纪（约460至450 MA），比结构更深的西部oo片（420至400 mA）的UHP变质早。作为一个工作假设，通过提取前骨岩石圈块的提取在弧形碰撞中形成的seve uhp岩石被挖掘出来，部分与波罗的海 - 洛伦碰撞期间的西部片麻岩络合物一起重新分配，并通过提取iApetus eace slab slab slab sloce collision。喜马拉雅山中的模拟过程将涵盖印度与印度边缘岩石中的Kohistan-Ladakh Arc和UHP变质的碰撞，通过提取上覆的地幔楔的挖掘，目前正在不断地将印度甲壳的俯冲到UHP深度上，而无法直接观察到印度甲壳。我们将使用以下方法检验假设：SEVE的HP和UHP单位上的结构和微观结构工作，以确定地层的变形历史； lu-hf石榴石的eclogites约会； U-Pb锆石的催化性融化以及后，同步和后堤防的介绍；在斯堪的纳维亚喀里多尼德的四个横截面的逐步翻新。

项目成果

Lu–Hf geochronology of ultra-high-pressure eclogites from the Tromsø-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation

斯堪的纳维亚喀里多尼亚特罗姆瑟-纳普超高压榴辉岩的 LuâHf 地质年代学：快速俯冲和折返的证据

• DOI: 10.1007/s00531-020-01866-0
• 发表时间: 2020
• 期刊: International Journal of Earth Sciences
• 影响因子: 2.3
• 作者: Fassmer;Martinet;Miladinova;Sprung;Froitzheim;Fonseca;Münker;Janák;Kullerud
• 通讯作者: Kullerud

Middle Ordovician subduction of continental crust in the Scandinavian Caledonides: an example from Tjeliken, Seve Nappe Complex, Sweden

斯堪的纳维亚喀里多尼德山脉中奥陶世大陆地壳俯冲：瑞典塞韦纳佩杂岩 Tjeliken 的一个例子

• DOI: 10.1007/s00410-017-1420-7
• 发表时间: 2017
• 期刊: Contributions to Mineralogy and Petrology
• 影响因子: 3.5
• 作者: Fassmer;Klonowska;Walczak;Andersson;Froitzheim;Fonseca;Münker;Janák;Whitehouse
• 通讯作者: Whitehouse

Diachronous collision in the Seve Nappe Complex: Evidence from Lu–Hf geochronology of eclogites (Norrbotten, North Sweden)

Seve Naappe 杂岩中的历时碰撞：来自榴辉岩 LuâHf 地质年代学的证据（北瑞典北博滕）

• DOI: 10.1111/jmg.12591
• 发表时间: 2021
• 期刊: Journal of Metamorphic Geology
• 影响因子: 3.4
• 作者: Fassmer;Froitzheim;Janák;Strohmeyer;Bukala;Münker
• 通讯作者: Münker

Monazite behaviour during metamorphic evolution of a diamond-bearing gneiss: a case study from the Seve Nappe Complex, Scandinavian Caledonides

含金刚石片麻岩变质演化过程中独居石的行为：斯堪的纳维亚喀里多尼德塞韦推覆杂岩的案例研究

• DOI: 10.1093/petrology/egz051
• 发表时间: 2019
• 期刊: Journal of Petrology
• 影响因子: 3.9
• 作者: Petrik I;Janak M;Klonowska I;Majka J;Froitzheim N;Yoshida K;Sasinkova V;Konecny P;Vaculovic T
• 通讯作者: Vaculovic T