Morphostructural evidence of crustal-scale, active along-strike segmentation of the Umbria-Marche Apennines, Italy

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
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Abstract

This paper discusses the response of topography and river networks to non-uniform lithology and tectonic forcing in the Umbria-Marche sector of the Apennines fold and thrust belt. We ruled out the role of variable erosion of rock types and interpret channel steepness data in terms of rock uplift, discovering a southward increase in the total amount of uplift. Such a trend appears as the large-scale response to uneven vertical motions of different sectors of the mountain ridge and foothills. The general coincidence between sector boundaries and transversal, NE-SW striking faults mapped by seismic interpretation in the outer zone of the fold and thrust belt, suggests that such faults extend to the SW, beneath the allochthonous thrust sheets of the mountainous area. Therefore, it may be inferred that such transversal faults represent long-lived, deeply rooted basement structures compartmentalizing both the axial and the outer zones of the fold and thrust belt. We suggest that differential uplift was essentially controlled by variable amounts of basement thrust displacement characterizing the compartmentalized belt. This interpretation deviates from a more conventional view that uplift of the central Apennines, particularly prominent in the south, is dynamically supported. Our results, besides shedding new light into the active tectonic behavior of a large portion of the Italian peninsula, also provide general insights into the surface response to the differential behavior of crustal blocks produced by along-strike segmentation of active mountain belts.

Abstract Image

意大利翁布里亚-马尔凯亚平宁山脉地壳尺度活跃沿脉分段的形态构造证据
本文讨论了亚平宁褶皱和推力带翁布里亚-马尔凯地区的地形和河网对不均匀岩性和构造作用的响应。我们排除了岩石类型多变侵蚀的作用,并从岩石隆起的角度解释了河道陡度数据,发现隆起总量向南增加。这种趋势是山脊和山麓不同地段不均匀垂直运动的大规模反应。褶皱和推力带外围地带的地震解释所绘制的横向、东北-西南走向断层与扇形边界之间的普遍吻合表明,此类断层延伸至西南部,位于山区的同生推力片之下。因此,可以推断这种横向断层代表了长期存在的、根深蒂固的基底结构,将褶皱与推力带的轴向和外侧区域分隔开来。我们认为,差异隆升主要受控于不同数量的基底推力位移,这也是分隔带的特征。这一解释偏离了亚平宁半岛中部(尤其是南部)的隆升是由动力支持的这一传统观点。我们的研究结果除了为意大利半岛大部分地区的活动构造行为提供了新的启示之外,还对活动山带沿走向分段所产生的地壳块体不同行为的地表反应提供了一般的见解。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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