DOI: 10.1016/j.epsl.2021.117064
论文题名: Late Carboniferous paleoelevation of the Variscan Belt of Western Europe
作者: Dusséaux C. ; Gébelin A. ; Ruffet G. ; Mulch A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 569 语种: 英语
中文关键词: Carboniferous
; detachment
; meteoric fluids
; shear zone
; stable isotope paleoaltimetry
; Variscan
英文关键词: Geochronology
; Hydrogen
; Mica
; Carboniferous
; Detachment
; Meteoric fluids
; Paleoaltimetry
; Shear zone
; Stable isotope paleoaltimetry
; Variscan
; Variscan belt
; Water value
; Western Europe
; Isotopes
; Carboniferous
; detachment fault
; extensional tectonics
; Hercynian orogeny
; hydrogen isotope
; leucogranite
; meteoric water
; muscovite
; shear zone
; stable isotope
; strike-slip fault
; France
; Limousin
; Massif Central
; Nouvelle-Aquitaine
; Wallago attu
英文摘要: We present the first stable isotope paleoaltimetry estimates for the hinterland of the eroded Variscan Belt of Western Europe based on the hydrogen isotope ratios of muscovite from syntectonic leucogranites that have been emplaced at ∼315 Ma. We focus on the Limousin region (Western Massif Central, France) where peraluminous granites are spatially associated with strike-slip and detachment shear zones that developed as a consequence of Late Carboniferous syn- to post-orogenic extension. In this region, we show that the north-east corner of the Millevaches massif (located at the junction between brittle and ductile fault systems) represented a pathway for Earth surface-derived fluids that penetrated the crust and reached the ductile segment of the low-angle Felletin detachment zone. Using microstructural, thermometry, hydrogen isotope and 40Ar/39Ar geochronological data, we show that these Variscan meteoric fluids interacted with hydrous silicates during high temperature deformation between ∼318 and 310 Ma. For paleoaltimetry purposes, we reference our hydrogen isotope record (δD) of ancient meteoric fluids from mylonitic rocks to ∼295 Myr-old records retrieved from freshwater shark remains preserved in the Bourbon l'Archambault basin that developed in the external zones of the orogen. A ∼76‰ difference in δDmeteoric water values between the Millevaches massif (δDmeteoric water value = −96 ± 8‰) and the Bourbon l'Archambault foreland basin (δDwater value = −20 ± 6‰) is consistent with paleoaltimetry estimates of 3.4 ± 0.7 km based on a modern lapse rate of ∼-22‰/km for δDwater values. The rather large difference in δD values between the foreland basin and the continental interior suggests that the hinterland of the Variscan belt of western Europe was high enough to act as a barrier to moisture transport from the south-south-east and induce an orographic rain shadow to the north. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165456
Appears in Collections: 气候变化与战略
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作者单位: SoGEES, University of Plymouth, Plymouth, PL48AA, United Kingdom; CNRS (CNRS/INSU), UMR 6118, Géosciences Rennes, Rennes Cedex, 35042, France; Université de Rennes 1, Géosciences Rennes, Rennes Cedex, 35042, France; Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt, 60325, Germany; Institute of Geosciences, Goethe University Frankfurt, Frankfurt, 60438, Germany
Recommended Citation:
Dusséaux C.,Gébelin A.,Ruffet G.,et al. Late Carboniferous paleoelevation of the Variscan Belt of Western Europe[J]. Earth and Planetary Science Letters,2021-01-01,569