南阿尔卑斯德尔维奥-奥尔吉亚斯卡带石炭纪-三叠纪中地壳构造与热演化

IF 3.5 2区 地球科学 Q1 GEOLOGY Journal of Metamorphic Geology Pub Date : 2023-02-23 DOI:10.1111/jmg.12714
Christophe Real, Kathrin Fassmer, Rodolfo Carosi, Nikolaus Froitzheim, Daniela Rubatto, Chiara Groppo, Carsten Münker, Simona Ferrando
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引用次数: 5

摘要

前亚得里亚海被动边缘的中地壳遗迹保存完好,暴露在南阿尔卑斯山(意大利)。Dervio–Olgiasca带位于科莫湖北部Insubric线以南,由于缺乏阿尔卑斯山套印,为研究前阿尔卑斯山(裂谷相关)历史提供了有利条件。我们通过伟晶岩和寄主云母的岩石学(岩石学、矿物化学、热气压测量和热力学建模)和地质年代(石榴石中的Lu/Hf和独居石中的U–Pb)数据重建了亚得里亚中地壳的P–T–T–d演化。这些数据可以重建阿尔卑斯裂谷作用开始时亚得里亚海近端边缘的复杂构造热演化。角闪岩相石炭系变质基底(7.6–10 kbar和610–660°C,318–312 Ma)受到二叠纪中期至晚期普遍伸展变形(5.1–7.6 kbar和580–660°C)的影响(257.5 ± 3.8Ma)。伟晶岩侵入249.8 ± 1.1 Ma,处于伸展阶段,在3.5–4.5 kbar和560–600°C下使基底岩石重新平衡。三叠纪中期至晚期(241–235 Ma),基底经历静态热再结晶(T = 689 ± 41°C和~5.0 kbar)。这一晚阿尼斯期至早卡尼期热事件与未来亚得里亚海近端边缘碳酸盐岩平台的出现、火山活动和矿床沉积同时发生。中地壳随后的冷却与上地壳(如卢加诺-瓦尔-格兰德断层)中形成的大规模伸展分离同步,后者控制了蒙特杰尼罗索盆地的形成。这项研究表明,亚得里亚海中地壳记录的局部后石炭世变薄和加热事件与不同地壳水平上发生的其他过程相互关联,而这些过程又是由阿尔卑斯裂谷早期的地壳拉伸引起的。
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Carboniferous–Triassic tectonic and thermal evolution of the middle crust section of the Dervio–Olgiasca Zone (Southern Alps)

A well-preserved remnant of the middle crust of the former Adriatic passive margin is exposed in the Southern Alps (Italy). The Dervio–Olgiasca Zone is located south of the Insubric Line along the northern part of Como Lake and, because of the lack of Alpine overprint, provides favourable conditions to investigate the pre-Alpine (rift-related) history. We reconstruct the P–T–t–d evolution of the Adria middle crust through petrological (petrography, mineral chemistry, thermobarometry and thermodynamic modelling) and geochronological (Lu/Hf in garnet and U–Pb in monazite) data from pegmatites and host micaschists. These data allow reconstruction of a complex tectono-thermal evolution of the future proximal Adriatic margin at the onset of Alpine rifting. The amphibolite-facies Carboniferous metamorphic basement (7.6–10 kbar and 610–660°C at 318–312 Ma) was affected by pervasive extensional deformation (5.1–7.6 kbar and 580–660°C) in the Middle- to Late-Permian (257.5 ± 3.8 Ma). Pegmatite intruded at 249.8 ± 1.1 Ma in an extensional phase that re-equilibrated rocks of the basement at 3.5–4.5 kbar and 560–600°C. During the Middle- to Late-Triassic (241–235 Ma), the basement experienced static thermal recrystallization (T = 689 ± 41°C and ~5.0 kbar). This Late-Anisian to Early-Carnian thermal event was simultaneous with the emersion of carbonate platforms, volcanism and ore deposition in the future proximal Adriatic margin. The subsequent cooling of the middle crust was synchronous with large-scale extensional detachments developed in the upper crust (e.g., the Lugano-Val Grande Fault), which controlled the formation of the Monte Generoso Basin. This study reveals that the local post-Carboniferous thinning and heating events recorded in the Adriatic middle crust were interconnected to other processes occurring at different crustal levels that were, in turn, induced by crustal stretching in the early stages of the Alpine rifting.

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来源期刊
CiteScore
6.60
自引率
11.80%
发文量
57
审稿时长
6-12 weeks
期刊介绍: The journal, which is published nine times a year, encompasses the entire range of metamorphic studies, from the scale of the individual crystal to that of lithospheric plates, including regional studies of metamorphic terranes, modelling of metamorphic processes, microstructural and deformation studies in relation to metamorphism, geochronology and geochemistry in metamorphic systems, the experimental study of metamorphic reactions, properties of metamorphic minerals and rocks and the economic aspects of metamorphic terranes.
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