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首页> 外文期刊>Terra Nova >Exhumation patterns along shallow low-angle normal faults: an example from the Altotiberina active fault system (Northern Apennines, Italy)
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Exhumation patterns along shallow low-angle normal faults: an example from the Altotiberina active fault system (Northern Apennines, Italy)

机译：浅层低角度正断层的发掘模式：以阿尔托贝利纳活动断层系统为例（意大利北亚平宁山脉）

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摘要

A multi-method approach (palaeothermal and thermochronological analyses; thermal modelling) is applied to reconstruct the exhumation history of the Altotiberina Fault (ATF), a representative example of crustal-scale active low-angle normal faulting in the Northern Apennines (Italy). Thermal maturity and thermochronological data yield similar burial histories but different exhumation patterns for the sedimentary successions in the hangingwall and the footwall of the ATF. Since 3.8Ma, the ATF footwall has exhumed at rates of 0.90mma(-1). Exhumation led to bending and deactivation of the ATF uppermost portion as a result of tectonic unloading and isostatic adjustment, followed by migration of extension and the development of a set of domino-like, east-dipping normal faults, rooting on the buried portion of the ATF. ATF activity and isostatic rebound exhumed Triassic rock units from depths of about 4km. We suggest that isostatic instability is accommodated at shallow crustal levels, in a similar way to what is observed on larger structures at mid-low crustal levels.
机译：多方法方法（古热和热年代学分析;热模拟）被用于重建阿尔特贝蒂贝纳断层（ATF）的发掘历史，这是北亚平宁山脉（意大利）地壳尺度活动性低角度正断层的代表例子。热成熟度和热年代学数据可得出相似的埋葬历史，但对于ATF上盘和下盘的沉积演替，其掘出方式不同。自3.8Ma以来，ATF后壁的挖掘速率为0.90mma（-1）。由于构造卸载和等静压调整，发掘导致ATF最上部弯曲和失活，随后伸展运动并发育出一系列类似多米诺骨型，向东倾斜的正断层，这些断层根植于该盆地的埋藏部分。 ATF。 ATF活动和等静回弹从约4 km的深度挖掘出三叠纪岩石单元。我们建议在地壳浅层容纳等静不稳，这与在地壳中低层上大型结构所观察到的相似。

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