Stratigraphic and structural reconstruction of an offshore sector of the Hyblean Foreland ramp (southern Italy)

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
S. Distefano, F. Gamberi, A. Stefano
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引用次数: 5

Abstract

Through the seismo-stratigraphic analysis of new high- resolution seismic data acquired along the southwestern offshore of the Hyblean Plateau, this work aims to improve the knowledge about the stratigraphic and structural setting in the marine area connecting the Hyblean Plateau Foreland to the Gela-Catania Foredeep.Two main goals have motivated the acquisition of new seismic profiles along the southern coastline of Sicily, in the Marina di Ragusa offshore:(i) to obtain a better comprehension of the Cenozoic stratigraphic and structural setting of the area, with a particular attention to the characterization of the Pliocene-Holocene sedimentary deposits and their areal distribution;(ii) to identify, in the offshore area, the possible prolongation of the main structural lineaments outcropping in the hinterland (Scicli-Ragusa-Irminio Line), and verify the presence of structures, responsible for the tectonic activity affecting the area.Our model shows that an extensional fault system, characterized by a main NE-SW orientation, affects the highly deformed Oligo-Miocene, or older, substratum, originating structural highs and down-faulted sectors. These faults are inferred to record the early history of the Scicli Line and of the polyphase kinematic evolution of the N50° oriented regional fault systems.The Gessoso-Solfifera deposits (Messinian, Late Miocene) have been recognized in several sectors of the study area, showing a very peculiar seismic facies, and occupying deep erosional channels probably resting within down-faulted sectors. This feature is in good agreement with isolated onshore areas of the Hyblean Plateau (Licodia Eubea and south Vittoria villages) where the Gessoso-Solfifera deposits are associated to normal faults, thus documenting that Messinian evaporites are not restricted to compressive tectonic setting, such as the marginal sub-basins and the thrust top mini-basins of the Appennine-Maghrebian belt.A peculiar seismic facies has been associated to the Trubi Fm., unconformably lying upon the older succession.The undeformed seismic units, onlapping the older substratum, has been associated to the post-Trubi-Holocene deposits, arranged into seven seismic units that reflect the youngest depositional evolution of the nearby Catania-Gela Foredeep. These deposits, generally represented by plane-parallel seismic facies, are in turn separated by an unconformity highlighted by an onlap termination of the yougermost terms upon the older. In some cases they are interrupted by gas rising from the deeper succession that reaches, at times, also the seafloor.
Hyblen Foreland斜坡海上部分的地层和结构重建(意大利南部)
通过对海勃兰高原西南近海新获得的高分辨率地震资料的地震地层学分析,这项工作旨在提高对连接Hyblen高原前缘和Gela Catania Foredeep的海洋区域的地层和结构背景的认识。两个主要目标推动了西西里岛南部海岸线新地震剖面的获取,在Marina di Ragusa近海:(i)更好地了解该地区的新生代地层和结构背景,特别注意上新世-全新世沉积矿床的特征及其区域分布;(ii)在近海地区,确定腹地(Scicli Ragusa-Irminio线)露出的主要结构线理的可能延长,并验证影响该地区的构造活动的结构的存在。我们的模型表明,以北东-西向为主的伸展断层系统影响了高度变形的渐新世-中新世或更老的下地层,产生了构造高点和下断层段。这些断层被推断为记录了Scicli线的早期历史和N50°定向区域断层系统的多相运动演化。Gessoso-Solfifera矿床(Messinian,晚中新世)已在研究区域的几个区域被识别,显示出非常独特的地震相,并占据可能位于下断层区域内的深层侵蚀通道。这一特征与Hyblen高原的孤立陆上区域(Licodia Eubea和南Vittoria村庄)非常一致,Gessoso-Solfifera矿床与正断层有关,因此记录了Messinian蒸发岩不局限于压缩构造环境,如阿平宁-马格里布带的边缘亚盆地和逆冲顶部小型盆地。一种特殊的地震相与特鲁比组有关,不整合地位于较老的层序上。未变形的地震单元覆盖在较老的下地层上,与特鲁比全新世后矿床有关,排列成七个地震单元,反映了附近Catania Gela Foredeep最年轻的沉积演化。这些矿床通常以平面平行地震相表示,反过来又被不整合分开,不整合突出显示为较老矿床上最优格期的上超终止。在某些情况下,它们会被从更深的层序上升的气体打断,有时还会到达海底。
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来源期刊
Italian Journal of Geosciences
Italian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
2.90
自引率
11.10%
发文量
25
审稿时长
>12 weeks
期刊介绍: The Italian Journal of Geosciences (born from the merging of the Bollettino della Società Geologica Italiana and the Bollettino del Servizio Geologico d''Italia) provides an international outlet for the publication of high-quality original research contributions in the broad field of the geosciences. It publishes research papers, special short papers, review papers, discussion-and-replies for their rapid distribution to the international geosciences community. The journal is firstly intended to call attention to the Italian territory and the adjacent areas for the exceptional role they play in the understanding of geological processes, in the development of modern geology and the Earth sciences in general. The main focus of the journal is on the geology of Italy and the surrounding sedimentary basins and landmasses, and on their relationships with the Mediterranean geology and geodynamics. Nevertheless, manuscripts on process-oriented and regional studies concerning any other area of the World are also considered for publication. Papers on structural geology, stratigraphy, sedimentology, basin analysis, paleontology, ecosystems, paleoceanography, paleoclimatology, planetary sciences, geomorphology, volcanology, mineralogy, geochemistry, petrology, geophysics, geodynamics, hydrogeology, geohazards, marine and engineering geology, modelling of geological process, history of geology, the conservation of the geological heritage, and all related applied sciences are welcome.
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