DOI: 10.1016/j.earscirev.2019.102959
论文题名: Late stages of continent-continent collision: Timing, kinematic evolution, and exhumation of the Northern rim (Aar Massif) of the Alps
作者: Herwegh M. ; Berger A. ; Glotzbach C. ; Wangenheim C. ; Mock S. ; Wehrens P. ; Baumberger R. ; Egli D. ; Kissling E.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 200 语种: 英语
英文关键词: collision zone
; continental margin
; deformation
; exhumation
; kinematics
; normal fault
; rifting
; subduction zone
; uplift
; Aar Massif
; Alps
; Switzerland
英文摘要: The Alpine front's External Crystalline Massifs represent exhumation of mid-crustal basement during late-stage continent-continent collision. We unravel the geodynamic evolution of the Northalpine front (Aar Massif) by combining structural and low-T thermochronometric data. A crustal-scale tectonic restoration (Neogene-present) and estimation of associated changes in exhumation rates become possible. The European continental margin experienced multiple switches from horizontal- to vertical- and again to horizontal-dominated tectonics. Early thrust-related inversion of rift basins is followed by a switch to rapid vertical exhumation, with deformation along steep reverse/normal faults. This vertical tectonics is related to a positive buoyancy force of the European crust induced by lower crustal delamination of the Aar Massif during an orogenic rollback process of the European lithosphere (∼22-20 Ma). Differential rock uplift rates of up to 1.3–1.6 km/Myr resulted, which decreased northwards to 0.1 km/Myr. Reducing buoyancy forces (isostatic compensation) led to a horizontal tectonic style again. Persisting compressional forces induced an orogen-scale strain partitioning with dextral transpressive faults in the south and simultaneous crustal-scale northwest-directed thrusting in the north. ‘En-bloc’ exhumation of the entire Aar Massif in the thrust's hanging wall occurred between 13-5 Ma and 5-0 Ma at rates of 0.5-0.9 km/Myr and 0.6-0.8 km/Myr, respectively. It is this late-stage thrusting in combination with surface erosion, which shaped today's prominent Northalpine front. Switches between horizontal and vertical tectonics might generally be relevant for late continent-continent collisional stages. Here, buoyancy forces of non-thinned continental crust entering the subduction zone cause a strong vertical tectonic deformation style instead of classical thrust tectonics. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166109
Appears in Collections: 气候变化与战略
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作者单位: Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, Bern, CH-3012, Switzerland; Institute for Geology, Leibniz University Hanover, Callinstrasse 30, Hannover, 30167, Germany; Institute of Geophysics, ETH Zürich, Sonneggstrasse 5, Zürich, CH-8092, Switzerland
Recommended Citation:
Herwegh M.,Berger A.,Glotzbach C.,et al. Late stages of continent-continent collision: Timing, kinematic evolution, and exhumation of the Northern rim (Aar Massif) of the Alps[J]. Earth Science Reviews,2020-01-01,200