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GEOREF RECORD

Structural styles in fold-and-thrust belts involving early salt structures; the Northern Calcareous Alps (Austria)

Pablo Granado, Eduard Roca, Philipp Strauss, Klaus Pelz and Josep Anton Munoz
Structural styles in fold-and-thrust belts involving early salt structures; the Northern Calcareous Alps (Austria)
Geology (Boulder) (November 2018) 47 (1): 51-54

Abstract

Shortened salt-withdrawal minibasins and associated salt welds are exposed in the Mesozoic strata of the Northern Calcareous Alps fold-and-thrust belt (Austria). Geological mapping and sequential restoration of a balanced cross section have indicated that these salt and salt-related structures developed during the postrift stage of the Neo-Tethys continental margin by evacuation and inflation/deflation of uppermost Permian to lowermost Triassic salt. Middle to Late Triassic minibasins were formed by down-building and downslope translation, flanked by megaflaps and salt walls. Salt and salt structures were rejuvenated by salt-wall fall and formation of bowl minibasins as a response to Penninic rifting since Rhaetian times. Complex structural styles, including younger-on-older contacts, tight folds, and kilometer-scale fully overturned panels resulted from the shortening of early salt structures upon the onset of Jurassic regional convergence. Salt tectonics can reconcile the stratigraphic development and internal structure of the long-debated Northern Calcareous Alps. Our work also provides a new line of research for understanding other fold-and-thrust belts developed from the Neo-Tethys continental margin (i.e., the Carpathian Mountains, the Southern Alps in Europe, the Dinaric Alps) and sets guidelines for other salt-influenced fold belts.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 1
Title: Structural styles in fold-and-thrust belts involving early salt structures; the Northern Calcareous Alps (Austria)
Affiliation: Universitat de Barcelona, Departament de Dinamica de la Terra i de l'Ocea, Barcelona, Spain
Pages: 51-54
Published: 20181130
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 30
Accession Number: 2019-007028
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019012
Illustration Description: illus. incl. sect., geol. sketch maps
N46°15'00" - N49°00'00", E09°30'00" - E17°15'00"
Secondary Affiliation: OMV Exploration and Production, AUT, Austria
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201906
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