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

Stutenbecker, Laura; Tollan, Peter M. E.; Madella, Andrea; Lanari, Pierre (2019). Miocene basement exhumation in the Central Alps recorded by detrital garnet geochemistry in foreland basin deposits. Solid Earth, 10(5), pp. 1581-1595. Copernicus Publications 10.5194/se-10-1581-2019

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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:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Petrology

UniBE Contributor:

Tollan, Peter Michael Edward and Lanari, Pierre

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1869-9510

Publisher:

Copernicus Publications

Language:

English

Submitter:

Pierre Lanari

Date Deposited:

22 Apr 2020 13:08

Last Modified:

24 Feb 2021 01:58

Publisher DOI:

10.5194/se-10-1581-2019

BORIS DOI:

10.7892/boris.143446

URI:

https://boris.unibe.ch/id/eprint/143446

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