globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228790
论文题名:
Fault reactivation and propagation in the northern Adamello pluton: The structure and kinematics of a kilometre-scale seismogenic source
作者: Mittempergher S.; Zanchi A.; Zanchetta S.; Fumagalli M.; Gukov K.; Bistacchi A.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 806
语种: 英语
中文关键词: Adamello ; Fault reactivation ; Paleostress ; Seismogenic faults ; Transpression
英文关键词: Strike-slip faults ; Early Oligocene ; Fault dip angle ; Fault reactivation ; Fault-slip analysis ; Pseudotachylytes ; Regional structure ; Seismogenic faults ; Structural feature ; Fault slips ; emplacement ; fault propagation ; fault zone ; kinematics ; paleostress ; reactivation ; seismic source ; seismotectonics ; thrust fault ; transpression ; Adamello Batholith ; Italy
英文摘要: The northern Adamello batholith (European Southern Alps) is crosscut by E-W trending pseudotachylyte-bearing paleoseismic fault zones composed of multiple subparallel fault strands. The main faults are the Gole Strette Fault Zone (GSFZ), here discussed in detail, and the Gole Larghe Fault Zone (GLFZ). The western ending of the GSFZ intersects the propagation of the Gallinera Thrust, a regional structure of Late Cretaceous age, which was truncated and dismembered by the late Eocene - early Oligocene emplacement of the Adamello batholith. Fault slip analysis and paleostress reconstruction suggest that the GSFZ and the Gallinera Thrust were both active during dextral transpression related with Oligocene orogen-parallel shearing along the Periadriatic Fault System. The remnants of the Gallinera Thrust within the Adamello were reactivated as dextral-reverse faults and do not include pseudotachylytes. The pseudotachylyte-bearing GSFZ shows changing structural features from west to east: the fault dip angle decreases from 80° to 45°, the slip vector passes from strike-slip (pitch of 20°) to oblique (pitch of 35° to 45°), and the fault zone thickness increases (> 800 m at the intersection with the GLFZ). The GSFZ is an immature and strong fault as indicated by (i) the local geometry controlled by precursor joints; (ii) the along-strike segmentation; and (iii) the spread of seismogenic faults into wide fault zones. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170864
Appears in Collections:气候变化与战略

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作者单位: Department of Earth and Environmental Sciences, Università Milano Bicocca, Piazza della Scienza 4, Milano, 20121, Italy

Recommended Citation:
Mittempergher S.,Zanchi A.,Zanchetta S.,et al. Fault reactivation and propagation in the northern Adamello pluton: The structure and kinematics of a kilometre-scale seismogenic source[J]. Tectonophysics,2021-01-01,806
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