6533b81ffe1ef96bd1278727
RESEARCH PRODUCT
Thermal and structural modeling of the Scillato wedge-top basin source-to-sink system. Insights into the Sicilian fold-and-thrust belt evolution (Italy)
Maurizio Gasparo MorticelliWilliam SassiJean-luc RudkiewiczLuca AldegaAttilio SulliSveva CorradoMartina Balestrasubject
010504 meteorology & atmospheric sciencesmixed layers illite-smectiteStratigraphyCenozoic deformation[SDU.STU]Sciences of the Universe [physics]/Earth SciencesReflectionStructural basin010502 geochemistry & geophysics01 natural sciencesWedge (geometry)Paleontologywedge-top basin; vitrinite reflectance; mixed layers illite-smectite; thermal modelling; source-to-sink systems; Sicilian fold-and-thrust beltSicilian fold-and-thrust beltThermalthermal modellingClay mineralSedimentologySource to sinkEurope faultsvitrinite reflectancesource-to-sink systems0105 earth and related environmental sciencesMesozoic sedimentary rocks tectonicsgeographygeography.geographical_feature_categoryFaultingGeologySedimentology15. Life on landwedge-top basinlanguage.human_languageStratigraphyFold and thrust beltlanguageThree dimensional computer graphicsSicilianGeologyTertiarydescription
AbstractTemperature-dependent clay mineral assemblages, vitrinite reflectance, and one-dimensional (1-D) thermal and three-dimensional (3-D) geological modeling of a Neogene wedge-top basin in the Sicilian fold-and-thrust belt and its pre-orogenic substratum allowed us to: (1) define the burial history of the sedimentary succession filling the wedge-top basin and its substratum, (2) reconstruct the wedge-top basin geometry, depocenter migration, and sediment provenance through time in the framework of a source-to-sink system, and (3) shed new light into the kinematic evolution of the Apennine-Maghrebian fold-and-thrust belt.The pre-orogenic substratum of the Scillato basin shows an increase in levels of thermal maturity as a function of stratigraphic age that is consistent with maximum burial to 3.5 km in deep diagenetic conditions. In detail, Ro% values range from 0.40% to 0.94%, and random ordered illite-smectite (I-S) first converts to short-range ordered structures and then evolves to long-range ordered structures at the base of the Imerese unit. The wedge-top basin fill experienced shallow burial (∼2 km) and levels of thermal maturity in the immature stage of hydrocarbon generation and early diagenesis. Vitrinite reflectance and mixed-layer I-S values show two populations of authigenic and inherited phases. The indigenous population corresponds to macerals with Ro% values of 0.33%–0.45% and I-S with no preferred sequence in stacking of layers, whereas the reworked group corresponds to macerals with Ro% values of 0.42%–0.47% and short-range ordered I-S with no correlation as a function of depth.Authigenic and reworked components of the Scillato basin fill allowed us to unravel sediment provenance during the Neogene, identifying two main source areas feeding the wedge-top basin (crystalline units of the European domain and sedimentary units of the African domain), and to detect an early phase of exhumation driven by low-angle extensional faults that predated Neogene compression.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-11-01 |