Distinguishing tectonically-and gravity-driven synsedimentary deformation structures along the Apulian platform margin (Gargano Promontory,southern Italy) |
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| Institution: | 1. Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, 44121 Ferrara, Italy;2. University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 102a, 10000 Zagreb, Croatia;1. Department of Geology and Petroleum Geology, School of Geosciences, University of Aberdeen, Aberdeen, UK;2. Department of Geosciences, Tel Aviv University, Tel Aviv, Israel;3. Geological survey of Israel, Jerusalem, Israel;4. Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel;1. Istituto per l''Ambiente Marino Costiero, Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Porto di Napoli, I-80133 Naples, Italy;2. Dipartimento di Scienze — Sezione Geologia, Università degli Studi Roma Tre, Largo San Leonardo Murialdo, 1, I-00146 Rome, Italy;3. Istituto di Geologia Ambientale e Geoingegneria (IGAG-CNR), Area della Ricerca Roma 1 Montelibretti, Via Salaria, Monterotondo Scalo, I-00016 Rome, Italy |
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| Abstract: | The assessment of deformation types within the slope of a carbonate platform can be complicated by the possible interaction of rooted (tectonically-induced) and superficial (gravity-driven) structures. An ideal case study to document and distinguish tectonically- and gravity-driven structures is provided by the Cretaceous slope-to-basin carbonates exposed in the Gargano Promontory, southern Italy. These carbonates formed adjacent to the Apulian platform margin, which was oriented approximately NE–SW to NW–SE along the southern and northern edges of the promontory, respectively. Slump-related folds are characterised by axial planes typically oriented either sub-parallel or at small angles to the strike of the inferred paleoslope. In fact, the strike of folds is roughly NE–SW in the southern portion of the study area, whereas it is NW–SE in the northern part. Correspondingly, gravity-driven normal and reverse faults strike sub-parallel and at acute angles to the adjacent Apulian paleoslope. Cretaceous tectonic faults in the slope-to-basin carbonates form two principal sets striking NW–SE and WNW-ESE. The former set is made up of normal faults and the latter one includes mainly oblique-slip normal faults. Neither normal nor oblique-slip normal faults show any relationship with the geometry of the paleoslope. The results obtained from this study may help the interpretation of subsurface data in those geological contexts in which the interplay of gravitational and tectonic processes is responsible for deformation. |
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| Keywords: | Apulian platform Maiolica formation Synsedimentary faults Slumps Mass-transport deposits |
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