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Carbon-isotope anomalies and demise of carbonate platforms in the Sinemurian (Early Jurassic) of the Tethyan region: evidence from the Southern Alps (Northern Italy)

Published online by Cambridge University Press:  30 May 2016

DANIELE MASETTI ,
BILLY FIGUS ,
HUGH C. JENKYNS ,
FILIPPO BARATTOLO ,
EMANUELA MATTIOLI  and
RENATO POSENATO
DANIELE MASETTI*
Affiliation:
Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Polo scientifico-tecnologico, Via Giuseppe Saragat 1, 44122 Ferrara, Italy
BILLY FIGUS
Affiliation:
Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Polo scientifico-tecnologico, Via Giuseppe Saragat 1, 44122 Ferrara, Italy
HUGH C. JENKYNS
Affiliation:
Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK
FILIPPO BARATTOLO
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Napoli Federico II, Largo San Marcellino 10, 80138 Napoli, Italy
EMANUELA MATTIOLI
Affiliation:
UMR CNRS 5276 LGL-TPE, Université Claude Bernard Lyon 1, Ecole Normale Supérieure Lyon, Campus de la DOUA, Bâtiment Géode, 69622 Villeurbanne Cedex, France
RENATO POSENATO
Affiliation:
Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Polo scientifico-tecnologico, Via Giuseppe Saragat 1, 44122 Ferrara, Italy
*
†Author for correspondence: [email protected]
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Abstract

Despite its global impact on ecosystems, the Triassic/Jurassic boundary event had only a modest effect on the carbonate depositional systems of the Southern Alps, whereas a fundamental reorganization of the same palaeogeographic area took place during the Sinemurian Age. This paper investigates whether or not the well-documented demise of Sinemurian carbonate platforms in the Tethyan region was a response to a global event by examination of carbon-isotope anomalies in successions of different facies that record this interval of time. A chemostratigraphic transect from Lake Garda up to the eastern Italian border is illustrated by four stratigraphic sections; high-resolution (20 cm over key intervals) chemostratigraphic sampling allowed detection of a major negative δ13C anomaly of ~ 1.5‰, preceded by a positive excursion, both in shallow- and deep-water successions, over the stratigraphical range of the ammonite genus Arnioceras. A comparison with sections from the UK suggests that the positive excursion belongs to the turneri Zone and the succeeding negative excursion falls within the obtusum Zone. In the deep-water Belluno Basin, the negative anomaly occurs in a biogenic chert-rich unit recording the onset of mesotrophic conditions in the basin. In the platform-carbonate successions, this major negative carbon-isotope excursion is developed within a calcarenitic unit corresponding to the lowest occurrence of the foraminifer Paleomayncina termieri. This evidence for deepening and transgression across the carbonate platform suggests pre-conditioning for drowning. Hence, rather than tectonic subsidence alone, environmental factors may have aided the demise of Tethyan carbonate platforms during the Early Jurassic Sinemurian Age.

Keywords

carbon-isotope anomaliescarbonate platform demiseTethyan continental marginsJurassic, Southern AlpsNorthern Italy
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 3 , May 2017 , pp. 625 - 650
Copyright
Copyright © Cambridge University Press 2016 

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