DOI: 10.1016/j.quascirev.2014.08.009
Scopus记录号: 2-s2.0-84925461611
论文题名: Interaction between regional and local tectonic forcing along a complex Quaternary extensional basin: Upper Tiber Valley, Northern Apennines, Italy
作者: Pucci S. ; Mirabella F. ; Pazzaglia F. ; Barchi M.R. ; Melelli L. ; Tuccimei P. ; Soligo M. ; Saccucci L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 102 起始页码: 111
结束页码: 132
语种: 英语
英文关键词: Low-angle normal fault
; Quaternary basin
; River terraces
; Seismic reflection profiles
Scopus关键词: Deposits
; Fault slips
; Rivers
; Seismic waves
; Seismology
; Subsidence
; Tectonics
; Normal faults
; Northern Apennines
; Pleistocene deposits
; Quaternary basins
; Regional tectonics
; River terraces
; Sedimentary evolution
; Seismic reflection profiles
; Faulting
; basin evolution
; continental lithosphere
; denudation
; depocenter
; displacement
; extensional tectonics
; fluvial geomorphology
; geomorphology
; infill
; Pleistocene
; Quaternary
; river terrace
; seismic reflection
; subsidence
; tectonic evolution
; tectonics
; uplift
; Apennines
; Italy
; Tiber Valley
英文摘要: In extending areas undergoing regional tectonic uplift, the persistence of subsidence at a normal-fault hanging-wall depends on the competition between regional and local tectonic effects. When regional uplift exceeds the subsidence of the hanging-wall block, denudation prevails at both the hanging-wall and the foot-wall. When local tectonic subsidence exceeds regional uplift, sedimentation occurs over the hanging-wall block, supplied by foot-wall erosion. We analyzed a Pliocene-Quaternary continental basin, currently crossed by the Tiber River in Italy. The tectono-sedimentary evolution of the basin developed at the hanging-wall of a regional low-angle extensional detachment, the Alto Tiberina Fault, in the axial region of the Northern Apennines of Italy. This area is affected by regional uplift on the order of 0.5-1.0mm/yr. The present-day activity of the fault is revealed by both microseismicity and geodetic (GPS) data. We investigated the mid- (10-100ka) and long-term (0.5-3.0Ma) evolution of the three depocenters by studying the continental Pleistocene succession infilling the basin as well as fluvial terraces and higher paleosurfaces carved into the Pleistocene deposits. By using surficial geologic data and an interpretation of a set of seismic reflection profiles, we show that the three depocenters experienced a fairly similar evolution during the Pliocene-Early Pleistocene, when a 1000-m-thick continental succession was deposited. On the contrary, geomorphological observations indicate that, at the beginning of the Middle Pleistocene, a switch occurred in the evolution of the three depocenters. In the northernmost Sansepolcro sub-basin, bounding normal faults are active and hanging-wall subsidence outpaces regional uplift. Concurrently, in the Umbertide and Ponte Pattoli sub-basins uplift dominates over the hanging-wall subsidence, promoting river incision and exhumation of the Pleistocene deposits. For these two depocenters, by means of terrace-river correlations, we estimate that the incision rate is ~0.3-0.35mm/yr, suggesting a maximum tectonic subsidence of 0.2mm/yr. The identification of a heterogeneous uplift pattern along the hanging-wall of the Alto Tiberina Fault, driven by different displacement rates of its fault splays, allowed us to characterize fault segments with different activities and, possibly, different seismic behaviors. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60156
Appears in Collections: 过去全球变化的重建
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作者单位: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Rome, Italy; Dipartimento di Fisica e Geologia, Università di Perugia, Piazza dell'Università, Perugia, Italy; Istituto di Ricerca per protezione idrogeologica, Consiglio Nazionale delle Ricerche, via Madonna Alta 126, Perugia, Italy; IntGeoMod s.r.l., Via Innamorati 7/a, Perugia, Italy; Science Department, Section of Earth Science, University Roma, 3, Largo San L. Murialdo, Rome, Italy
Recommended Citation:
Pucci S.,Mirabella F.,Pazzaglia F.,et al. Interaction between regional and local tectonic forcing along a complex Quaternary extensional basin: Upper Tiber Valley, Northern Apennines, Italy[J]. Quaternary Science Reviews,2014-01-01,102