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亚山脉是一个碰撞造山带，可与现在的喜马拉雅山相媲美，但自古生代形成以来就受到了严重侵蚀。因此，可以直接在现场研究造山带的深层，并与当今造山带的地表和地球物理信息相补充，形成更完整的喜马拉雅型碰撞造山图景。塞韦纳佩杂岩体是来自波罗托斯坎迪亚边缘外部的冲断层的组合，在大约 1970 年与劳伦西亚碰撞期间，在波罗的海大陆上空向东移动。 400 Ma 并在约 400 Ma 的距离上出现。位于瑞典和挪威的 1000 公里处，最近通过温压测量和发现微金刚石包裹体被确定为超高压 (UHP) 变质岩。塞维地区的超高压变质作用可能发生在晚奥陶世（约460至450Ma），早于结构较深的西部片麻岩杂岩的超高压变质作用（约420至400Ma）。作为一个工作假设，七种超高压岩石是在弧大陆碰撞中形成的，通过提取弧前岩石圈块体而被挖出，在波罗的海-劳伦西亚碰撞期间与西部片麻岩杂岩一起部分重新俯冲，并通过提取土卫八洋板再次被挖出。喜马拉雅山的类似过程将包括印度与科希斯坦-拉达克弧的碰撞和印度边缘岩石的超高压变质作用，通过上覆地幔楔的提取而折返，以及印度地壳目前正在进行的俯冲到超高压深度，而超高压深度是人类无法接近的。直接观察。我们将使用以下方法检验该假设：对 Seve 的 HP 和 UHP 单元进行结构和微观结构工作，以建立地体的变形历史；榴辉岩的Lu-Hf石榴石测年；与折返相关的熔体以及构造前、同期和构造后岩脉的 U-Pb 锆石定年；斯堪的纳维亚喀里多尼德山脉四个横截面的逐步逆变形。

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