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Dinaric up-thrusts in the Pliocene evolution of the Central Apennines thrust belt of Italy: the Montagna dei Fiori structure
Geological Magazine ( IF 2.3 ) Pub Date : 2021-07-28 , DOI: 10.1017/s0016756821000613
Fernando Calamita 1 , Paolo Pace 2 , Vittorio Scisciani 1 , Fabiana Properzi 1 , Mirko Francioni 3
Affiliation  

Several orogenic belts exhibit regional-scale anticlines characterized by prominent faults in their crestal/forelimb zone. These faults are also a common feature in the Neogene fold-and-thrust belt of the Apennines, where they have been contrastingly interpreted as younger-on-older thrust faults, large-scale strike-slip faults, and pre- or syn-thrusting normal faults. In this study, we analysed a NW–SE-trending fault (Montagna dei Fiori Fault) that affects the hinge-zone/forelimb of the Montagna dei Fiori Anticline. This fold is the outermost exposed contractional structure within the Pliocene–Quaternary antiformal stack of the outer Central Apennines. The integration of stratigraphic and structural data collected during a field geological survey enabled us to reconstruct a multiphase reactivation and deformation along the Montagna dei Fiori Fault. From the novel field data, a different interpretation for the evolution of the Montagna dei Fiori Fault is proposed. The fault originated as a Late Cretaceous – middle Miocene, NE-dipping, Dinaric up-thrust and was later reactivated, displaced and rotated during Pliocene Apennine thrusting and related folding, until assuming a present-day SW-dipping attitude with an apparent normal fault character. This newly proposed Dinaric origin of the Montagna dei Fiori structure is compared with an analogous subsurface example of a Palaeogene–Quaternary structure imaged by seismic reflection profile in the Adriatic foreland. The outcome of this combined field and subsurface investigation provides new elements to unravel the complex evolution of the Apennine thrust belt that developed at the expense of a previously deformed foreland, ahead of the advancing Dinaric chain.

中文翻译:

意大利中亚平宁冲断带上新世演化中的第纳尔向上冲断层:Montagna dei Fiori 构造

几个造山带表现出区域尺度的背斜,其特征是其顶部/前肢带的明显断层。这些断层也是亚平宁山脉新近纪褶皱逆冲带的一个共同特征,在那里它们被对比地解释为新旧逆冲断层、大规模走滑断层和前逆冲断层或同逆逆冲断层。正常故障。在这项研究中,我们分析了一条影响 Montagna dei Fiori 背斜铰链区/前肢的 NW-SE 向断层(Montagna dei Fiori 断层)。这个褶皱是外中央亚平宁山脉的上新世-第四纪反形式叠层中最外露的收缩结构。在野外地质调查期间收集的地层和结构数据的整合使我们能够重建 Montagna dei Fiori 断层沿线的多期再激活和变形。根据新的现场数据,提出了对 Montagna dei Fiori 断层演化的不同解释。该断层起源于晚白垩世-中新世中新世,北东倾,第纳尔向上逆冲,后来在上新世亚平宁逆冲和相关褶皱过程中重新激活、位移和旋转,直到呈现今天的西南倾姿态和明显的正断层特点。这个新提出的Montagna dei Fiori结构的第纳尔起源与亚得里亚海前陆地震反射剖面成像的古近纪-第四纪结构的类似地下示例进行了比较。这种结合现场和地下调查的结果提供了新的元素来揭示亚平宁逆冲带的复杂演化,这种演化是以以前变形的前陆为代价而发展起来的,
更新日期:2021-07-28
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