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首页> 外文期刊>Journal of geodynamics >Early-Middle Pleistocene eastward migration of the Abruzzi Apennine (central Italy) extensional domain
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Early-Middle Pleistocene eastward migration of the Abruzzi Apennine (central Italy) extensional domain

机译：Abruzzi Apennine（意大利中部）扩展域的早中新世东移

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The evolution of the Apennine arc is related to the flexural retreat of the Adriatic lithosphere plate, the NE migration of the compressive front and the contemporaneous rifting of the Tyrrhenian basin. Evidence of the NE migration of the orogen can also be inferred from the analysis of the intra-Apennine Quaternary extensional tectonics. Stratigraphic and structural data collected along NE-SW transects in the Abruzzi Apennines (central Italy), indeed, indicate that the westernmost normal faults (activated during the Pliocene) have to be considered inactive since the Early Pleistocene (Turano valley fault) or the beginning of the Middle Pleistocene (Salto valley and Liri valley faults). In contrast, the easternmost faults (Campo Imperatore and Mt. Morrone faults) were activated during the Early Pleistocene and are still active, as demonstrated by the displacement of Late Pleistocene-Holocene deposits and landforms. Within the innermost portion of the extensional domain, the Fucino and upper Aterno valley fault systems show persistent activity since the Pliocene. Besides the evidence of a progressively NE-shifted intra-Apennine extension, available data suggest that a period of co-existing activity of the presently inactive and newly activated faults (e.g. Liri valley and Mt. Morrone faults, respectively) occurred during the Early Pleistocene. This indicates that for a few hundred thousand years active faults in the central Apennines were more numerous than in the period of the present tectonic regime. This may have resulted in a reduced activity per fault (lower slip rates) or an increased intra-Apennine extension rate. Quaternary faults in the Abruzzi Apennines generally coincide with pre-existing discontinuities such as old thrust ramps or syn-orogenic normal faults. Based on a simple geometric criteria, i.e. direction, dip, length of the pre-existing discontinuities located east of the investigated area, and assuming a still active NE-migration of the extensional domain, it is possible to hypothesize that the old and presently inactive normal faults of the Maiella and Montagna dei Fiori anticlines may accomodate active extension of the future. The NE-ward shifting of the extensional domain would be, instead, locked if the process of lithospheric flexural retreat which drove the Neogene-Quaternary p.p. structural evolution of the Apennine chain has ended during the Early Pleistocene.
机译：亚平宁弧的演化与亚得里亚海岩石圈板块的弯曲退缩，压前锋的东北移动和第勒尼安盆地的同时裂谷有关。造山带NE迁移的证据也可以从对亚平宁内部第四纪构造构造的分析中得出。实际上，阿布鲁奇亚平宁山脉（意大利中部）沿NE-SW断面收集的地层和结构数据表明，自早更新世（图拉诺河谷断层）或开始以来，最西端的正断层（在上新世激活）中更新世（萨尔托河谷和里里河谷断层）。相反，最东部的断层（Campo Imperatore断层和Morrone断层）在更新世早期就被激活，并且仍然活跃，如晚更新世-全新世沉积和地貌的位移所证明。自上新世以来，Fucino和上阿特诺河谷断层系统在伸展带的最内部。除了逐渐向东北移动的亚平宁内部扩展的证据外，现有数据还表明，目前处于不活动状态和新激活的断层（例如分别为里里谷和莫罗隆山断层）共存活动的时期发生在早更新世。 。这表明，在几十万年的时间里，亚平宁山脉中部的活动断层比当前构造时代的活动断层更多。这可能导致每个故障的活动减少（较低的滑移率）或增加的亚精氨酸内部延伸率。阿布鲁奇亚平宁山脉中的第四纪断层通常与先前存在的不连续性相吻合，例如旧的逆冲斜坡或同造山型正断层。基于简单的几何准则，即方向，倾角，位于研究区域东部的不连续区域的长度，并假设扩展域的NE迁移仍处于活跃状态，则可以假设旧的和当前不活跃的Maiella和Montagna dei Fiori背斜的正常断层可能会适应未来的活跃扩展。相反，如果驱使新近纪-第四纪pp.p.的岩石圈挠曲性退缩过程，则将锁定扩展域的NE向移位。亚平宁链的结构演变已在早更新世结束。

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