The Sveconorwegian orogeny

被引：72

作者：

Bingen, Bernard ^{[1
]}

Viola, Giulio ^{[2
]}

Moller, Charlotte ^{[3
]}

Vander Auwera, Jacqueline ^{[4
]}

Laurent, Antonin ^{[5
]}

Yi, Keewook ^{[6
]}

机构：

[1] Geol Survey Norway, N-7491 Trondheim, Norway

[2] Univ Bologna, Dept Biol Geol & Environm Sci, BiGeA, I-40126 Bologna, Italy

[3] Lund Univ, Dept Geol, Solvegatan 12, SE-22362 Lund, Sweden

[4] Univ Liege, Dept Geol, B-4000 Liege, Belgium

[5] Univ Lyon, UJM St Etienne, LMV UMR 6524, CNRS,UCA,IRD, F-42023 St Etienne, France

[6] Korea Basic Sci Inst, Chungbuk 363883, South Korea

来源：

GONDWANA RESEARCH | 2021年 / 90卷

关键词：

Sveconorwegian; Mesoproterozoic; Rodinia; Continental collision; Orogenic plateau-lithospheric mantle delamination; SOKNDAL LAYERED INTRUSION; U-PB GEOCHRONOLOGY; ROGALAND ANORTHOSITE PROVINCE; CENTRAL METASEDIMENTARY BELT; HIGH-GRADE METAMORPHISM; GA CONTINENTAL-CRUST; T-T PATH; ULTRAHIGH-TEMPERATURE METAMORPHISM; JOTUNITE HYPERSTHENE MONZODIORITE; DETRITAL ZIRCON GEOCHRONOLOGY;

D O I：

10.1016/j.gr.2020.10.014

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This article reviews the geology of the Sveconorwegian orogen in south Scandinavia and existing tectonic models for the Mesoproterozoic to Neoproterozoic Sveconorwegian orogeny. It proposes an updated geodynamic scenario of large, hot, long-duration continental collision starting at c. 1065 Ma between proto-Baltica and another plate, presumably Amazonia, in a Rodinia-forming context. An orogenic plateau formed at 1280 Ma as a back-arc Cordillera-style plateau, and then grew further stepwise after 1065 Ma, as a collisional Tibetan-style plateau. Voluminous mantleand crustal-derived Sveconorwegian magmatism took place in the hinterland in the west of the orogen, mainly: (i) bimodal magmatism at 1280-1145 Ma, overlapping with extensional intramontane basin sedimentation, (ii) the calc-alkaline Sirdal magmatic belt at 1065-1020 Ma, (iii) the hydrous ferroan hornblende-biotite granite (HBG) suite at 985-925 Ma and (iv) the anhydrous ferroan massif-type anorthosite-mangerite-charnockite (AMC) suite at 935-915 Ma. High-alumina orthopyroxene megacrysts in anorthosite imply mafic underplating at 1040 Ma and remelting of the underplates at 930 Ma. Overlapping with magmatism, protracted low-pressure, granulite-facies metamorphism reached twice ultra-high temperature conditions of 0.6 GPa-920 degrees C at 1030-1005 Ma and 0.4 GPa-920 degrees C at 930 Ma, respectively. These features imply shallow asthenosphere under the crust. Towards the foreland in the east, metamorphism shows an increasing high-pressure signature eastwards with time, with peak P-T values of 1.15 GPa-850 degrees C at 1150-1120 Ma in the Bamble-Kongsberg lithotectonic units, 1.5 GPa-740 degrees C at c. 1050 Ma in the Idefjorden lithotectonic unit, and 1.8 GPa-870 degrees C at c. 990 Ma in the Eastern Segment under eclogite-facies conditions. These are attributed to retreating delamination of the dense sub-continental lithospheric mantle and growth of the orogenic plateau towards the foreland. After c. 930 Ma, convergence came to a halt, the orogenic plateau collapsed, and 16 km of overburden was removed by extension and erosion. (c) 2020 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

引用

页码：273 / 313

页数：41

共 436 条

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