Details
| Original language | English |
|---|---|
| Pages (from-to) | 2191-2205 |
| Number of pages | 15 |
| Journal | Geological magazine |
| Volume | 159 |
| Issue number | 11-12 |
| Early online date | 23 Feb 2022 |
| Publication status | Published - Nov 2022 |
Abstract
Infrahelvetic flysch units of the central European Alps (Glarus Alps, Switzerland), which were accreted to the North Alpine fold-and-thrust belt during the early stages of continental collision. We show that the vein carbonates trace the Sr isotopic evolution of pore fluids from an initial seawater-like signature towards the Sr isotopic composition of the host rock with increasing metamorphic grade. This relationship reflects the progressive equilibration of the pore fluid with the host rock and allows us to constrain the diagenetic to low-grade metamorphic conditions of deformation events, including bedding-parallel shearing, imbricate thrusting, folding, cleavage development, tectonic m lange formation and extension. The strontium isotope systematics of vein carbonates provides new insights into the prograde to early retrograde tectonic evolution of the Alpine fold-and-thrust belt and helps to understand the relative timing of deformation events.
Keywords
- accretion, European Alps, fluid flow, fold-and-thrust belt, Keywords:, mineral veins, strontium isotopes
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
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In: Geological magazine, Vol. 159, No. 11-12, 11.2022, p. 2191-2205.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Tracing wedge-internal deformation by means of strontium isotope systematics of vein carbonates
AU - Dielforder, A
AU - Villa, I. M.
AU - Berger, A
AU - Herwegh, M
N1 - Funding information: Funding for this project was provided by the Swiss National Science Foundation (No. 144381). We thank H. Vollstaedt for discussion and support in the laboratory. The thoughtful and constructive reviews by Johannes Glodny and one anonymous reviewer are gratefully acknowledged. The authors declare that there is no conflict of interest.
PY - 2022/11
Y1 - 2022/11
N2 - Radiogenic strontium isotopes (87Sr/86Sr) of vein carbonates play a central role in the tectonometamorphic study of fold-and-thrust belts and accretionary wedges and have been used to document fluid sources and fluxes, for example, along major fault zones. In addition, the 87Sr/86Sr ratios of vein carbonates can trace the diagenetic to metamorphic evolution of pore fluids in accreted sediments. Here we present 87Sr/86Sr ratios of vein carbonates from theInfrahelvetic flysch units of the central European Alps (Glarus Alps, Switzerland), which were accreted to the North Alpine fold-and-thrust belt during the early stages of continental collision. We show that the vein carbonates trace the Sr isotopic evolution of pore fluids from an initial seawater-like signature towards the Sr isotopic composition of the host rock with increasing metamorphic grade. This relationship reflects the progressive equilibration of the pore fluid with the host rock and allows us to constrain the diagenetic to low-grade metamorphic conditions of deformation events, including bedding-parallel shearing, imbricate thrusting, folding, cleavage development, tectonic m lange formation and extension. The strontium isotope systematics of vein carbonates provides new insights into the prograde to early retrograde tectonic evolution of the Alpine fold-and-thrust belt and helps to understand the relative timing of deformation events.
AB - Radiogenic strontium isotopes (87Sr/86Sr) of vein carbonates play a central role in the tectonometamorphic study of fold-and-thrust belts and accretionary wedges and have been used to document fluid sources and fluxes, for example, along major fault zones. In addition, the 87Sr/86Sr ratios of vein carbonates can trace the diagenetic to metamorphic evolution of pore fluids in accreted sediments. Here we present 87Sr/86Sr ratios of vein carbonates from theInfrahelvetic flysch units of the central European Alps (Glarus Alps, Switzerland), which were accreted to the North Alpine fold-and-thrust belt during the early stages of continental collision. We show that the vein carbonates trace the Sr isotopic evolution of pore fluids from an initial seawater-like signature towards the Sr isotopic composition of the host rock with increasing metamorphic grade. This relationship reflects the progressive equilibration of the pore fluid with the host rock and allows us to constrain the diagenetic to low-grade metamorphic conditions of deformation events, including bedding-parallel shearing, imbricate thrusting, folding, cleavage development, tectonic m lange formation and extension. The strontium isotope systematics of vein carbonates provides new insights into the prograde to early retrograde tectonic evolution of the Alpine fold-and-thrust belt and helps to understand the relative timing of deformation events.
KW - accretion
KW - European Alps
KW - fluid flow
KW - fold-and-thrust belt
KW - Keywords:
KW - mineral veins
KW - strontium isotopes
UR - http://www.scopus.com/inward/record.url?scp=85125540920&partnerID=8YFLogxK
U2 - 10.1017/S0016756821001357
DO - 10.1017/S0016756821001357
M3 - Article
VL - 159
SP - 2191
EP - 2205
JO - Geological magazine
JF - Geological magazine
SN - 0016-7568
IS - 11-12
ER -