Transition from slab roll-back to slab break-off in the central Apennines, Italy: Constraints from the stratigraphic and thermochronologic record
Transition from slab roll-back to slab break-off in the central Apennines, Italy: Constraints from the stratigraphic and thermochronologic record
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意大利亚平宁山脉中部从板块回滚到板块断裂的转变：来自地层和热年代学记录的限制
DOI：
10.1130/b36123.1
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
C. Maden
中科院分区：
文献类型：
--
作者：
M. Fellin;Malwina San José;C. Faccenna;S. Willett;D. Cosentino;R. Lanari;L. Gourbet;C. Maden
地层学和热年代学数据被用来研究形成意大利亚平宁山脉中部地形的过程。这些是地中海地区中心一个主要的活跃山脉带的一部分，那里有几个俯冲带控制着复杂的地形。亚平宁山脉的形成是由覆盖俯冲的亚德里亚微板块的增生楔前部的收缩，以及随后在楔后部的延伸，以响应向东的板块回滚。在亚平宁山脉中部，西侧的山间伸展盆地向东向山顶隆起。我们的贡献与新的数据组成的28（U-Th-Sm）/He和10裂变径迹年龄磷灰石解决复杂的模式的热历史在时间和空间上，我们解释为反映过渡状态的造山带，经历了两个阶段的演变有关的初始板撤退，随后板剥离。沿着第勒尼阶海岸，我们记录了发生在8 ~ 5 Ma之间的深度≥3 - 4 km的冷却，并与海洋伸展盆地的打开有关。在−5 Ma后，亚平宁山脉中部更广泛的区域表现出不同深度的冷却，大部分区域在<2 km和东北部≥3−4 km之间，并且具有不同的开始时间：大约在2000年。4、在西方，在西方。2.5马在中心和东北部，并在ca。东南方1马。5和2.5马之间，折返与适度的地形增长在后期阶段的逆冲推覆。自2.5 Ma以来，折返同时在西部和东部的山间盆地的开放，与区域地形的增长和侵蚀，我们解释为与当地分离板。
Stratigraphic and thermochronologic data are used to study the processes that shaped the topography of the central Apennines of Italy. These are part of a major, active mountain belt in the center of the Mediterranean area, where several subduction zones control a complex topography. The Apennines were shaped by contraction at the front of the accretionary wedge overlying the subducting Adria microplate followed by extension at the wedge rear in response to eastward slab roll-back. In the central Apennines, intermontane extensional basins on the western flank rise eastward toward the summit. We contribute with new data consisting of 28 (U-Th-Sm)/He and 10 fission track ages on apatites to resolve a complex pattern of thermal histories in time and space, which we interpret as reflecting the transitional state of the orogen, undergoing a two-phase evolution related to initial slab retreat, followed by slab detachment. Along the Tyrrhenian coast, we document cooling from depths ≥3−4 km occurring between 8 and 5 Ma and related to the opening of marine extensional basins. Post−5 Ma, a broader region of the central Apennines exhibits cooling from variable depths, between <2 km in most areas and ≥3−4 km in the northeast, and with different onset times: at ca. 4 Ma in the west, at ca. 2.5 Ma in the center and northeast, and at ca. 1 Ma in the southeast. Between 5 and 2.5 Ma, exhumation is associated with modest topographic growth during the late stages of thrusting. Since 2.5 Ma, exhumation has concurred with the opening of intermontane basins in the west and in the east, with regional topographic growth and erosion, that we interpret to be associated with the locally detaching slab.