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Miocene basement exhumation in the Central Alps recorded by detrital garnet geochemistry in foreland basin deposits

Stutenbecker, Laura and Tollan, Peter M. E. and Madella, Andrea and Lanari, Pierre (2019):
Miocene basement exhumation in the Central Alps recorded by detrital garnet geochemistry in foreland basin deposits.
In: Solid Earth, 10 (5), Copernicus, pp. 1581-1595, ISSN 1869-9529,
DOI: 10.5194/se-10-1581-2019,
[Online-Edition: https://doi.org/10.5194/se-10-1581-2019],
[Article]

Abstract

The Neogene evolution of the European Alps was characterized by the exhumation of crystalline basement, the so-called external crystalline massifs. Their exhumation presumably controlled the evolution of relief, distribution of drainage networks, and generation of sediment in the Central Alps. However, due to the absence of suitable proxies, the timing of their surficial exposure and thus the initiation of sediment supply from these areas are poorly constrained.

The northern Alpine foreland basin preserves the Oligocene to Miocene sedimentary record of tectonic and climatic adjustments in the hinterland. This contribution analyses the provenance of 25 to 14 Myr old alluvial fan deposits by means of detrital garnet chemistry. Unusually grossular- and spessartine-rich garnet is found (1) to be a unique proxy for identifying detritus from the external crystalline massifs and (2) to occur abundantly in ca. 14 Myr old deposits of the foreland basin. In contrast to previous assumptions, we therefore propose that the external massifs were already exposed to the surface ca. 14 Myr ago.

Item Type: Article
Erschienen: 2019
Creators: Stutenbecker, Laura and Tollan, Peter M. E. and Madella, Andrea and Lanari, Pierre
Title: Miocene basement exhumation in the Central Alps recorded by detrital garnet geochemistry in foreland basin deposits
Language: English
Abstract:

The Neogene evolution of the European Alps was characterized by the exhumation of crystalline basement, the so-called external crystalline massifs. Their exhumation presumably controlled the evolution of relief, distribution of drainage networks, and generation of sediment in the Central Alps. However, due to the absence of suitable proxies, the timing of their surficial exposure and thus the initiation of sediment supply from these areas are poorly constrained.

The northern Alpine foreland basin preserves the Oligocene to Miocene sedimentary record of tectonic and climatic adjustments in the hinterland. This contribution analyses the provenance of 25 to 14 Myr old alluvial fan deposits by means of detrital garnet chemistry. Unusually grossular- and spessartine-rich garnet is found (1) to be a unique proxy for identifying detritus from the external crystalline massifs and (2) to occur abundantly in ca. 14 Myr old deposits of the foreland basin. In contrast to previous assumptions, we therefore propose that the external massifs were already exposed to the surface ca. 14 Myr ago.

Journal or Publication Title: Solid Earth
Volume: 10
Number: 5
Publisher: Copernicus
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Applied Sedimentary Geology
Date Deposited: 27 Sep 2019 06:42
DOI: 10.5194/se-10-1581-2019
Official URL: https://doi.org/10.5194/se-10-1581-2019
URN: urn:nbn:de:tuda-tuprints-92039
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