Paleozoic structural controls on shortening transfer in the Subandean foreland thrust system, Ene and southern Ucayali basins, Peru

Espurt, Nicolás; Brusset, Stéphane; Baby, Patrice; Hermoza, Wilber; Bolaños, Rolando; Uyen, Dennys; Deramond, Julie

doi:10.1029/2007tc002238

Cited by 46 publications

(56 citation statements)

References 82 publications

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“…6.5b), which can be correlated with three main unconformities and large stratigraphic gaps. The lower jump is correlated with the unconformity developed at the base of the Late Carboniferous series (see Espurt et al 2008). The intermediate jump is correlated with the unconformity developed at the base of the Cretaceous series (see Jaimes & de Freitas 2006 and references therein; see also Fig.…”

Section: Pliocene Depositsmentioning

confidence: 98%

The Nazca Ridge and Uplift of the Fitzcarrald Arch: Implications for Regional Geology in Northern South America

Espurt¹,

Baby²,

Brusset³

et al. 2009

Amazonia: Landscape and Species Evolution

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The Fitzcarrald Arch corresponds to a NE-SW-trending widespread dissected relief of about 400,000 km 2 located to the east of the sub-Andean thrust front. Analyses of drainage maps demonstrate that this regional uplift controls the modern Amazonian drainage network. During the Miocene, the Fitzcarrald Arch did not exist and this area corresponded to the subsiding foredeep of the Amazonian foreland basin. Analyses of the Miocene deposits outcropping within the Fitzcarrald Arch area indicate that deposition was controlled by tidal current and consisted of tide-dominated deltas and estuaries. The tidal Miocene deposits were followed by fl uvial conglomerate and sandstone sediments, probably Pliocene to Pleistocene in age. Modelling of the vitrinite refl ectance data shows that the uplift of the Fitzcarrald Arch began in Pliocene times; this date is further confi rmed by sedimentary evidence such as provenance and a change of palaeocurrent directions from the Pliocene and Pleistocene record. Geophysical data show that the Fitzcarrald Arch uplift superimposed on the eastern part of the Nazca Ridge fl at slab segment. The fl at subduction process linked to the buoyancy of the Nazca Ridge has been active since ~4 Ma. Thus, the coincidence of the initiation of fl at slab subduction with the Pliocene uplift of the Fitzcarrald Arch implies that the fl at subduction of the Nazca Ridge is the cause of uplift. The Nazca Ridge fl at subduction is the process responsible for the modern confi guration of the Amazon drainage basin and may be one of the decisive factors that triggered large-scale modifi cation of the Amazonian landscape inducing drastic biota changes in the Amazonian basin during the last 4 million years.

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Section: Pliocene Depositsmentioning

confidence: 98%

The Nazca Ridge and Uplift of the Fitzcarrald Arch: Implications for Regional Geology in Northern South America

Espurt¹,

Baby²,

Brusset³

et al. 2009

Amazonia: Landscape and Species Evolution

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“…In particular, Miocene sediments show no significant thickness variation that precludes a synsedimentary Miocene uplift (Espurt, 2007). Seismic reflection profiles indicate no significant Neogene faulting in the study area with the exception of the Subandean Thrust Front, and the Moa Divisor area where some reactivation of Palaeozoic structures can be found Espurt et al, 2008a).…”

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

Geomorphic evidence for recent uplift of the Fitzcarrald Arch (Peru): A response to the Nazca Ridge subduction

et al. 2009

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The 400 000 km 2 -wide Fitzcarrald Arch constitutes a wide topographic high of the Amazon Basin against the central Andes. In order to constrain its formation mechanisms and in particular to test its relationships to the Nazca ridge subduction, a quantitative geomorphology analysis of the Arch is performed using hypsometric integrals, elongation and azimuths of 7th-and 5th-order catchments. They all express a trend from high maturity to low maturity from NW towards SE. This maturity gradient coupled with the local drainage direction demonstrate that the Fitzcarrald Arch is not a 'classical' alluvial fan, since its apex is located 100 km east to the Subandean Thrust Front and the corresponding sedimentary pile is lacking. Nor is the Arch the superficial expression of an inherited transfer zone, because its geomorphic shape is radial and it does not diverge from a symmetry axis; moreover, such a reactivated structure is not found at depth on seismic profiles. In addition, our data show that underlying geomorphic control on catchment initiation and development has progressed from NW to SE, which in combination with the observation of crustal doming by Espurt et al. [Espurt, N., Baby, P., Brusset, S., Roddaz, M., Hermoza, W., Regard, V., Antoine, P.O., SalasGismondi, R., Bolaños, R., 2007. How does the Nazca Ridge subduction influence the modern Amazonian foreland basin? Geology 35, 515-518.] suggests that this relief is caused by the eastward sliding of the buoyant Nazca ridge beneath the South American lithosphere.

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“…To the west of the Otishi Cordillera the Early Paleozoic strata form an east-verging duplex between two décollements located in the Ordovician and Carboniferous strata. The antiformal stack in the Otishi Cordillera is constrained by seismic and well data acquired for petroleum exploration [220]. East of the Otishi Cordillera the crystalline basement is uplifted by east-verging thrusts while the Palaeozoic-Cretaceous strata were thrust towards the west.…”

Section: Central Andes Of Chile-boliviamentioning

confidence: 99%

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

Pfiffner

2017

Geosciences

122

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This paper gives an overview of the large-scale tectonic styles encountered in orogens worldwide. Thin-skinned and thick-skinned tectonics represent two end member styles recognized in mountain ranges. Both styles are encountered in former passive margins of continental plates. Thick-skinned style including the entire crust and possibly the lithospheric mantle are associated with intracontinental contraction. Delamination of subducting continental crust and horizontal protrusion of upper plate crust into the opening gap occurs in the terminal stage of continent-continent collision. Continental crust thinned prior to contraction is likely to develop relatively thin thrust sheets of crystalline basement. A true thin-skinned type requires a detachment layer of sufficient thickness. Thickness of the décollement layer as well as the mechanical contrast between décollement layer and detached cover control the style of folding and thrusting within the detached cover units. In subduction-related orogens, thin-and thick-skinned deformation may occur several hundreds of kilometers from the plate contact zone. Basin inversion resulting from horizontal contraction may lead to the formation of basement uplifts by the combined reactivation of pre-existing normal faults and initiation of new reverse faults. In most orogens thick-skinned and thin-skinned structures both occur and evolve with a pattern where nappe stacking propagates outward and downward.

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Paleozoic structural controls on shortening transfer in the Subandean foreland thrust system, Ene and southern Ucayali basins, Peru

Cited by 46 publications

References 82 publications

The Nazca Ridge and Uplift of the Fitzcarrald Arch: Implications for Regional Geology in Northern South America

The Nazca Ridge and Uplift of the Fitzcarrald Arch: Implications for Regional Geology in Northern South America

Geomorphic evidence for recent uplift of the Fitzcarrald Arch (Peru): A response to the Nazca Ridge subduction

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

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