• Issue
    Volume 40, Issue 7
    July 2021

Research Article

Free Access

A Geomorphic Examination of the Calabrian Forearc Translation

  • First Published: 19 June 2021
Key Points

  • River long-profile inversions show that northern Sicily experienced two time-transgressive base level falls since 4 Ma

  • The base level fall pulses are related to the transit of the Calabrian forearc high during the opening of the Tyrrhenian Basin

  • Relationships and feedbacks between tectonic forcing and geomorphic response are documented

Free Access

Early Oligocene Surface Uplift in Southwestern Montana During the North American Cordilleran Extension

  • First Published: 17 June 2021
Key Points

  • 60 new volcanic glass δD values show a late Paleogene, two-stage negative shift of ∼35‰ in southwestern Montana

  • The late Eocene-earliest Oligocene shift occurred probably as a result of climate change

  • The early Oligocene shift most likely reflects regional surface uplift by convective removal of lower mantle lithosphere

Free Access

Architecture, Kinematics, and Tectonic Evolution of the Principal Cordillera of the Andes in Central Chile (∼33.5°S): Insights From Detrital Zircon U-Pb Geochronology and Seismotectonics Implications

  • First Published: 17 June 2021
Key Points

  • The geochronological new data confirm the Andean Jurassic arc as a sediment source for the Río Damas Formation

  • The geometry of the western AFTB is controlled by heterogeneities inherited from the Neuquén Basin

  • The Chacayes-Yesillo fault and the root of the Estero de Yeguas Muertas-Baños Colina fault system concentrate the recent seismic activity

Open Access

High- and Low-Angle Normal Fault Activity in a Collisional Orogen: The Northeastern Granada Basin (Betic Cordillera)

  • First Published: 21 June 2021
Key Points

  • Gravimetric data highlight the geometry of the sedimentary infill of the Granada Basin, which constitutes a half-graben tilted to the N-NE

  • Granada Basin's high-angle normal faults might be linked at depth to an active low-angle extensional deformation zone

  • The active Granada Fault zone shows low-magnitude seismicity and a current average vertical rate that varies from 0.4 to 1.1 mm/yr

Open Access

The Segmented Campo Felice Normal Faults: Seismic Potential Appraisal by Application of Empirical Relationships Between Rupture Length and Earthquake Magnitude in the Central Apennines, Italy

  • First Published: 21 June 2021
Key Points

  • Single and multisegment seismic potential for the Campo Felice normal faults (5.7 ≤ Mw ≥ 6.2)

  • Geological mapping and structural analyses for the reconstruction of possible future seismic scenarios

  • Validation of rupture length-earthquake magnitude empirical equations for central Apennines and comparison with a new proposed equation

Open Access

The Evolution of Central Volcanoes in Ultraslow Rift Systems: Constraints From D. João de Castro Seamount, Azores

  • First Published: 17 June 2021
Key Points

  • D. João de Castro seamount in the Terceira Rift, Azores is influenced by a SW-NE regional transtensional and a local radiating stress field

  • Structural, seismic, and geochemical data imply formation by the growth of volcanic ridges along with local stress field changes

  • The geometry, chemistry, and rifting rates of the Terceira Rift are more comparable to continental rifts rather than mid-ocean ridges

Introduction to a Special Section

Free Access

Introduction to the Special Section in “Geodynamics, Crustal and Lithospheric Tectonics, and Active Deformation in the Mediterranean Regions” (A Tribute to Prof. Renato Funiciello)

  • First Published: 18 June 2021
Key Points

  • New data and recent analysis of structural geology of the Mediterranean regions

  • Introduction to “Geodynamics, Crustal and Lithospheric Tectonics, and active deformation in the Mediterranean Regions”

  • A tribute to Prof. Renato Funiciello

Reply

Free Access

Reply to Comment by Poli et al. on “Fragmentation of the Adriatic Promontory: New Chronological Constraints From Neogene Shortening Rates Across the Southern Alps (NE Italy)”

  • First Published: 06 July 2021
Key Points

  • The comment on the DEM artefact is acknowledged, but it has no consequence on our conclusions about the post-Pliocene direction of maximum compression

  • The comment on the use of uncalibrated 14C ages is acknowledged, leading to a shortening-rate reduction of at most 15%

  • Our interpretations are in line with existing consensus on the crustal architecture and shortening-rate across the Eastern Southern Alps

Research Article

Open Access

Dynamics of the African Plate 75 Ma: From Plate Kinematic Reconstructions to Intraplate Paleo-Stresses

  • First Published: 07 July 2021
Key Points

  • Deformation of the African plate 75 Ma was mainly driven by horizontal gravitational stress, transform shear and weak slab pull

  • The weak pull from the Neotethys slab indicates that the slab was short or the pull was reduced by mantle resistance or by slab buoyancy

  • The complex closure history of the Neotethys Ocean is a likely candidate for the limited pull magnitude

Open Access

Taking the Pulse of Salt-Detached Gravity Gliding in the Eastern Mediterranean

  • First Published: 08 June 2021
Key Points

  • Ramp syncline basins offshore Lebanon are excellent records of translation on a salt-influenced passive margin dominated by gravity-gliding

  • Rates of basinward translation are approximately uniform at the km-scale but show significant lateral variability at the margin-scale

  • Differential translation rates are predominantly controlled by “pulses” of salt flow, as well as the mechanics of the overburden

Comment

Free Access

Comment on “Fragmentation of the Adriatic Promontory: New Chronological Constraints From Neogene Shortening Rates Across the Southern Alps (NE Italy)” by Moulin & Benedetti

  • First Published: 02 July 2021
Key Points

  • The chronological constraints and the shortening rates derive from misreading of the available literature and not from new original data

  • The description of the tectonic structures do not consider updated geological information available for the study area

  • The balanced cross-section is inconsistent with the major crustal models for the Eastern Southern Alps, no alternate discussion is provided

Research Article

Free Access

Terminal Suturing Between the Tarim Craton and the Yili-Central Tianshan Arc: Insights From Mélange-Ocean Plate Stratigraphy, Detrital Zircon Ages, and Provenance of the South Tianshan Accretionary Complex

  • First Published: 07 June 2021
Key Points

  • South Tianshan was an accretionary complex belonging to the Yili-Central Tianshan arc, rather than a passive margin of the Tarim Craton

  • Terminal suture between the Tarim and the Yili-Central Tianshan is situated in the southern boundary of the South Tianshan

  • Northward subduction of the South Tianshan oceanic plate lasted until the Late Triassic as indicated by a mixed provenance

Free Access

3-D Structure of the Variscan Thrust Front in Northern France: New Insights From Seismic Reflection Profiles

  • First Published: 21 June 2021
Key Points

  • Seismic data emphasize the large underthrusting of the Carboniferous foreland basin beneath the northern France Variscan thrust wedge

  • 3-D imaging of the main thrust Allochton Main Basal Thrust evidences a major lateral ramp segmenting the frontal thrust zone

  • Inherited normal faults from the Laurussian margin exerted a major control on the dynamics and segmentation of the thrust front

Open Access

Superimposed Rifting at the Junction of the Central and Equatorial Atlantic: Formation of the Passive Margin of the Guiana Shield

  • First Published: 17 June 2021
Key Points

  • Higher rifting obliquity and rates produced narrower rift and rifted margin segments

  • Warmer Central Atlantic rifting produced crustal flow and preserved thick syn-rift deposits contrary to cooler Equatorial Atlantic rifting

  • Lithosphere of the Demerara Plateau was thinned twice and became a buoyant continental raft since the Mid-Cretaceous

Free Access

Strain Partitioning Within Bending Orogens, New Insights From the Variscan Belt (Chiroulet-Lesponne Domes, Pyrenees)

  • First Published: 23 June 2021
Key Points

  • The Variscan crust of Pyrenees documents vertical strain partitioning: lateral flow versus upper-crust thickening in the core of Pangea

  • We document horizontal strain partitioning between extensional and compressional domains during plate-scale oroclinal bending

  • Large-scale strain patterns of bending hot orogens reflect initial conditions (at the onset of bending) and evolving free-boundaries

Free Access

Tectonic Growth of the Late Paleozoic-Middle Mesozoic Northwestern Margin of Laurentia and Implications for the Farewell Terrane: Stratigraphic, Structural, and Provenance Records From the Central Alaska Range

  • First Published: 14 July 2021
Key Points

  • Two stratigraphic packages in the central Alaska Range represent the Farewell terrane juxtaposed against the Mesozoic margin of Laurentia

  • Stratigraphic and provenance analyses document a connection between the Farewell terrane and the Insular terranes

  • Integration of data sets provides new insights on the transport history and timing of accretion of the Farewell terrane

Free Access

Timing of Alpine Orogeny and Postorogenic Extension in the Alboran Domain, Inner Rif Chain, Morocco

  • First Published: 19 June 2021
Key Points

  • Late Eocene (37-34 Ma) crustal shortening in the Alboran Domain during formation of an Africa-verging orogenic wedge

  • An Eocene age for the Alpine orogenic metamorphism must be considered for the geodynamic modeling of Western Mediterranean

  • Brittle thinning of the Alboran Domain nappe stack is constrained at 18-17 Ma in the back-arc region of the Apennine-Maghrebian subduction

Free Access

Syn-Subduction Strike-Slip Faults Shape an Accretionary Orogen and its Provenance Signatures: Insights From Sikhote-Alin in NE Asia During the Late Jurassic to Early Cretaceous

  • First Published: 17 June 2021
Key Points

  • Provenance change along the NE Asian margin was caused by large strike-slip faults cutting depocenters, not variations in the sources

  • Moving geographic positions of depocenters is rarely considered, but need more attentions when analyzing provenance change

  • Linking large strike-slip faults and sedimentary records can importantly contribute to plate and geographic reconstructions

Free Access

Investigating the Plate Kinematics of the Bay of Biscay Using Deformable Plate Tectonic Models

  • First Published: 07 June 2021
Key Points

  • The independent plate kinematics of the Landes High played an important role during the formation of the Bay of Biscay

  • Results of deformable plate models suggest the Ebro Block had minimal impact on the deformation experienced within the Bay of Biscay

  • Major lithospheric boundaries played a significant role in shaping the present-day crustal structure of the Bay of Biscay

Open Access

Significance of Northern Andes Terrane Extrusion and Genesis of the Interandean Valley: Paleomagnetic Evidence From the “Ecuadorian Orocline”

  • First Published: 02 July 2021
Key Points

  • 20°–30°CW post-Late Miocene rotation of the Cordillera Occidental, no rotation of the Cordillera Real, southern Ecuador

  • The southern Cordillera Occidental emplaced as a rotational nappe after the late Miocene-Pliocene over the flexural Interandean Valley basin

  • No paleomagnetic evidence for latitudinal terrane drift and orogen-parallel strike-slip activity since Mid-Late Eocene (∼40 Ma)

Issue Information

Free Access

Issue Information

  • First Published: 24 June 2021