Evidence for deep subduction of Austroalpine crust (Texel Complex, NE Italy)

Stefano Zanchetta; Stefano Poli; Daniela Rubatto; Andrea Zanchi; Giovanni Maria Bove

doi:10.1007/s12210-013-0239-z

Evidence for deep subduction of Austroalpine crust (Texel Complex, NE Italy)

Stefano Zanchetta^*, Stefano Poli, Daniela Rubatto, Andrea Zanchi, Giovanni Maria Bove

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We report here the discovery of UHP eclogites in the Ulfas Valley within the Texel Complex (Meran, NE Italy), which has important implications on the evolution of the Austroalpine nappe stack in the Eastern Alps. Exsolved K-feldspar and phengite lamellae within omphacite relics, together with an unusually high K-content of the host clinopyroxene, point to equilibrium pressures at least close to the quartz/coesite transition. The age of the high-pressure metamorphism is constrained by U-Pb dating of metamorphic zircon at 85 ± 4 Ma. These new data suggest pressure conditions for the Cretaceous eclogitic metamorphism of the Texel Complex higher than hitherto reported data, possibly indicating that several sectors of the Africa-Adria derived Austroalpine margin were subducted to mantle depths during the early stages of the Alpine orogeny.

Original language	English
Pages (from-to)	163-176
Number of pages	14
Journal	Rendiconti Lincei
Volume	24
Issue number	2
DOIs	https://doi.org/10.1007/s12210-013-0239-z
Publication status	Published - Jun 2013

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title = "Evidence for deep subduction of Austroalpine crust (Texel Complex, NE Italy)",

abstract = "We report here the discovery of UHP eclogites in the Ulfas Valley within the Texel Complex (Meran, NE Italy), which has important implications on the evolution of the Austroalpine nappe stack in the Eastern Alps. Exsolved K-feldspar and phengite lamellae within omphacite relics, together with an unusually high K-content of the host clinopyroxene, point to equilibrium pressures at least close to the quartz/coesite transition. The age of the high-pressure metamorphism is constrained by U-Pb dating of metamorphic zircon at 85 ± 4 Ma. These new data suggest pressure conditions for the Cretaceous eclogitic metamorphism of the Texel Complex higher than hitherto reported data, possibly indicating that several sectors of the Africa-Adria derived Austroalpine margin were subducted to mantle depths during the early stages of the Alpine orogeny.",

keywords = "Austroalpine, Cretaceous subduction, K-feldspar exsolutions, UHP metamorphism",

author = "Stefano Zanchetta and Stefano Poli and Daniela Rubatto and Andrea Zanchi and Bove, {Giovanni Maria}",

year = "2013",

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doi = "10.1007/s12210-013-0239-z",

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T1 - Evidence for deep subduction of Austroalpine crust (Texel Complex, NE Italy)

AU - Zanchetta, Stefano

AU - Poli, Stefano

AU - Rubatto, Daniela

AU - Zanchi, Andrea

AU - Bove, Giovanni Maria

PY - 2013/6

Y1 - 2013/6

N2 - We report here the discovery of UHP eclogites in the Ulfas Valley within the Texel Complex (Meran, NE Italy), which has important implications on the evolution of the Austroalpine nappe stack in the Eastern Alps. Exsolved K-feldspar and phengite lamellae within omphacite relics, together with an unusually high K-content of the host clinopyroxene, point to equilibrium pressures at least close to the quartz/coesite transition. The age of the high-pressure metamorphism is constrained by U-Pb dating of metamorphic zircon at 85 ± 4 Ma. These new data suggest pressure conditions for the Cretaceous eclogitic metamorphism of the Texel Complex higher than hitherto reported data, possibly indicating that several sectors of the Africa-Adria derived Austroalpine margin were subducted to mantle depths during the early stages of the Alpine orogeny.

AB - We report here the discovery of UHP eclogites in the Ulfas Valley within the Texel Complex (Meran, NE Italy), which has important implications on the evolution of the Austroalpine nappe stack in the Eastern Alps. Exsolved K-feldspar and phengite lamellae within omphacite relics, together with an unusually high K-content of the host clinopyroxene, point to equilibrium pressures at least close to the quartz/coesite transition. The age of the high-pressure metamorphism is constrained by U-Pb dating of metamorphic zircon at 85 ± 4 Ma. These new data suggest pressure conditions for the Cretaceous eclogitic metamorphism of the Texel Complex higher than hitherto reported data, possibly indicating that several sectors of the Africa-Adria derived Austroalpine margin were subducted to mantle depths during the early stages of the Alpine orogeny.

KW - Austroalpine

KW - Cretaceous subduction

KW - K-feldspar exsolutions

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U2 - 10.1007/s12210-013-0239-z

DO - 10.1007/s12210-013-0239-z

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EP - 176

JO - Rendiconti Lincei

JF - Rendiconti Lincei

IS - 2

ER -

Evidence for deep subduction of Austroalpine crust (Texel Complex, NE Italy)

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