Academic Journal
Carbon-isotope anomalies and demise of carbonate platforms in the Sinemurian (Early Jurassic) of the Tethyan region: evidence from the Southern Alps (Northern Italy)
| العنوان: | Carbon-isotope anomalies and demise of carbonate platforms in the Sinemurian (Early Jurassic) of the Tethyan region: evidence from the Southern Alps (Northern Italy) |
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| المؤلفون: | MASETTI, DANIELE, FIGUS, BILLY, JENKYNS, HUGH C., BARATTOLO, FILIPPO, MATTIOLI, EMANUELA, POSENATO, RENATO |
| المصدر: | Geological Magazine ; volume 154, issue 3, page 625-650 ; ISSN 0016-7568 1469-5081 |
| بيانات النشر: | Cambridge University Press (CUP) |
| سنة النشر: | 2016 |
| الوصف: | 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 δ 13 C 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. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1017/s0016756816000273 |
| الاتاحة: | http://dx.doi.org/10.1017/s0016756816000273 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756816000273 |
| Rights: | https://www.cambridge.org/core/terms |
| رقم الانضمام: | edsbas.D723193F |
| قاعدة البيانات: | BASE |
| DOI: | 10.1017/s0016756816000273 |
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