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Irene Zembo - One of the best experts on this subject based on the ideXlab platform.

  • tephrochronological study in the quaternary val d agri Intermontane Basin southern apennines italy
    International Journal of Earth Sciences, 2011
    Co-Authors: Irene Zembo, Pietro Vignola, Sergio Ando, R Bersezio, Luigina Vezzoli
    Abstract:

    In the south-eastern depocentre of the Val d’Agri Basin (Southern Apennines), a volcanic ash layer crops out interbedded within poorly structured alluvial fan deposits of Late Pleistocene age. Textural, depositional and pedological features of this weathered layer suggest a primary deposition from a pyroclastic fall-out of volcanic ash. Chemical analyses of feldspars show an alkali trachytic composition and accessory minerals association allow to correlate this tephra layer with the regionally dispersed Y-7 marine tephra layer (Tufo Verde Epomeo eruption, Ischia volcano), dated at 56 ± 4 ka. The Val d’Agri tephra here described for the first time was deposited during MIS Stage 3. Its recovery and characterization permit to contribute to regional correlation of the Mediterranean climatic and volcanic events from marine to continental successions and to describe landscape evolution of the Southern Apennines during glacial–interglacial cycles.

  • stratigraphic architecture and quaternary evolution of the val d agri Intermontane Basin southern apennines italy
    Sedimentary Geology, 2010
    Co-Authors: Irene Zembo
    Abstract:

    Abstract The sedimentary record of the Val d'Agri Basin is of great importance for understanding the Quaternary tectonic activity and climatic variability in the Southern Apennines. Changes in tectonic controls, sediment supply and climatic input have been identified. The interval from ∼ 56 to ∼ 43 ka was associated with asymmetric subsidence restricted to the north-eastern actively faulted margin of the Basin and development of axial braided river and transverse alluvial fan systems. Short-lasting Mediterranean-type pedogenesis between ∼ 43 and ∼ 32 ka (MIS Stage 3) coexisted with progradation–aggradation of the southern alluvial fan deposits and southwards tilting of the Basin floor. Aggradation ended with consumption of accommodation space after 32 ka. During a subsequent stage of decline of vegetation cover, possibly as a consequence of climatic cooling (probably MIS Stage 2), active progradation of alluvial fans occurred. Breakthrough of the Basin threshold and entrenchment of the drainage network must therefore be attributed to a latest Pleistocene to Holocene age. The first stages of Basin opening and fill, predating ∼ 56 ka have only been inferred by stratigraphic considerations: the earliest lacustrine sedimentation should be middle Pleistocene or older in age. The following south-eastward Basin widening allowed progradation of alluvial fan systems, which completely filled the lacustrine area (tentatively late middle Pleistocene). Pedogenesis in “Mediterranean-like” climate conditions caused the final development of a highly mature fersiallitic paleosol at the top of the fan surfaces, in areas of morpho-tectonic stability, plausibly during MIS Stage 5. The study results demonstrate the potential of applying a multidisciplinary approach in an Intermontane continental settings marked by a relative rapid and constant tectonic subsidence and a high rate of sediment supply during the Pleistocene glacial–interglacial cycles.

  • quaternary evolution of the Intermontane val d agri Basin southern apennines
    Quaternary Research, 2009
    Co-Authors: Irene Zembo, R Bersezio, L Panzeri, A Galli, M Martini, E Sibilia
    Abstract:

    Optically Stimulated Luminescence (OSL) enables the chronology of the late Pleistocene evolution for the Val d'Agri Intermontane Basin of Southern Apennines to be defined in the frame of Mediterranean geodynamic and climate changes. Quartz sand from braided floodplain and alluvial fan depositional systems was analyzed using the coarse-grained, single-aliquot regenerative-dose (SAR) technique. The obtained optical ages are mostly consistent with other assessments (radiocarbon, tephrochronology) and stratigraphic constraints. OSL allows for the dating to 56–43 ka of an asymmetric subsidence stage that forced alluvial fan progradation, filling of a former lacustrine area, and development of an axial alluvial plain. A short period of Mediterranean-type pedogenesis, recorded at the top of the prograding-aggrading fans (OSL age bracket 43–32 ka), corresponds with MIS 3. During the subsequent stage of decline of vegetation cover, possibly corresponding to MIS 2, the latest progradation of alluvial fans occurred. The subsequent uplift and breakthrough of the Basin threshold during the latest Pleistocene and Holocene induced entrenchment of the drainage network. The results presented here provide an example of the usefulness of OSL dating in Intermontane continental settings where other geochronological constraints are scarce.

Yves Hervouët - One of the best experts on this subject based on the ideXlab platform.

  • Neogene tectonostratigraphic history of the southern Neuquén Basin (39°-40°30′S, Argentina): Implications for foreland Basin evolution
    Basin Research, 2015
    Co-Authors: Damien Huyghe, Cédric Bonnel, Bertrand Nivière, Bertrand Fasentieux, Yves Hervouët
    Abstract:

    Although the Neuquén Basin in Argentina forms a key transitional domain between the south-central Andes and the Patagonian Andes, its Cenozoic history is poorly documented. We focus on the sedimentologic and tectonic evolution of the southern part of this Basin, at 39-40°30′S, based on study of 14 sedimentary sections. We provide evidence that this Basin underwent alternating erosion and deposition of reworked volcaniclastic material in continental and fluvial settings during the Neogene. In particular, basement uplift of the Sañico Massif, due to Late Miocene-Pliocene intensification of tectonic activity, led to sediment partitioning in the Basin. During this interval, sedimentation was restricted to the internal domain and the Collon Cura Basin evolved towards an endorheic Intermontane Basin. From stratigraphic interpretation, this Basin remained isolated 7-11 Myr. Nevertheless, ephemeral gateways seem to have existed, because we observe a thin succession downstream of the Sañico Massif contemporaneous with the Collon Cura Basin-fill sequence. Comparisons of stratigraphic, paleoenvironmental and tectonic features of the southern Neuquén Basin with other foreland Basins of South America allow us to classify it as a broken foreland with the development of an Intermontane Basin from Late Miocene to Late Pliocene. This implies a thick-skinned structural style for this Basin, with reactivation of basement faults responsible for exhumation of the Sañico Massif. Comparison of several broken forelands of South America allows us to propose two categories of Intermontane Basins according to their structural setting: subsiding or uplifted Basins, which has strong implications on their excavation histories.

  • Neogene tectonostratigraphic history of the southern Neuquén Basin (39°–40°30′S, Argentina): implications for foreland Basin evolution
    Basin Research, 2014
    Co-Authors: Damien Huyghe, Cédric Bonnel, Bertrand Nivière, Bertrand Fasentieux, Yves Hervouët
    Abstract:

    Although the Neuquen Basin in Argentina forms a key transitional domain between the south-central Andes and the Patagonian Andes, its Cenozoic history is poorly documented. We focus on the sedimentologic and tectonic evolution of the southern part of this Basin, at 39-40°30′S, based on study of 14 sedimentary sections. We provide evidence that this Basin underwent alternating erosion and deposition of reworked volcaniclastic material in continental and fluvial settings during the Neogene. In particular, basement uplift of the Sanico Massif, due to Late Miocene-Pliocene intensification of tectonic activity, led to sediment partitioning in the Basin. During this interval, sedimentation was restricted to the internal domain and the Collon Cura Basin evolved towards an endorheic Intermontane Basin. From stratigraphic interpretation, this Basin remained isolated 7-11 Myr. Nevertheless, ephemeral gateways seem to have existed, because we observe a thin succession downstream of the Sanico Massif contemporaneous with the Collon Cura Basin-fill sequence. Comparisons of stratigraphic, paleoenvironmental and tectonic features of the southern Neuquen Basin with other foreland Basins of South America allow us to classify it as a broken foreland with the development of an Intermontane Basin from Late Miocene to Late Pliocene. This implies a thick-skinned structural style for this Basin, with reactivation of basement faults responsible for exhumation of the Sanico Massif. Comparison of several broken forelands of South America allows us to propose two categories of Intermontane Basins according to their structural setting: subsiding or uplifted Basins, which has strong implications on their excavation histories.

Damien Huyghe - One of the best experts on this subject based on the ideXlab platform.

  • Neogene tectonostratigraphic history of the southern Neuquén Basin (39°-40°30′S, Argentina): Implications for foreland Basin evolution
    Basin Research, 2015
    Co-Authors: Damien Huyghe, Cédric Bonnel, Bertrand Nivière, Bertrand Fasentieux, Yves Hervouët
    Abstract:

    Although the Neuquén Basin in Argentina forms a key transitional domain between the south-central Andes and the Patagonian Andes, its Cenozoic history is poorly documented. We focus on the sedimentologic and tectonic evolution of the southern part of this Basin, at 39-40°30′S, based on study of 14 sedimentary sections. We provide evidence that this Basin underwent alternating erosion and deposition of reworked volcaniclastic material in continental and fluvial settings during the Neogene. In particular, basement uplift of the Sañico Massif, due to Late Miocene-Pliocene intensification of tectonic activity, led to sediment partitioning in the Basin. During this interval, sedimentation was restricted to the internal domain and the Collon Cura Basin evolved towards an endorheic Intermontane Basin. From stratigraphic interpretation, this Basin remained isolated 7-11 Myr. Nevertheless, ephemeral gateways seem to have existed, because we observe a thin succession downstream of the Sañico Massif contemporaneous with the Collon Cura Basin-fill sequence. Comparisons of stratigraphic, paleoenvironmental and tectonic features of the southern Neuquén Basin with other foreland Basins of South America allow us to classify it as a broken foreland with the development of an Intermontane Basin from Late Miocene to Late Pliocene. This implies a thick-skinned structural style for this Basin, with reactivation of basement faults responsible for exhumation of the Sañico Massif. Comparison of several broken forelands of South America allows us to propose two categories of Intermontane Basins according to their structural setting: subsiding or uplifted Basins, which has strong implications on their excavation histories.

  • Neogene tectonostratigraphic history of the southern Neuquén Basin (39°–40°30′S, Argentina): implications for foreland Basin evolution
    Basin Research, 2014
    Co-Authors: Damien Huyghe, Cédric Bonnel, Bertrand Nivière, Bertrand Fasentieux, Yves Hervouët
    Abstract:

    Although the Neuquen Basin in Argentina forms a key transitional domain between the south-central Andes and the Patagonian Andes, its Cenozoic history is poorly documented. We focus on the sedimentologic and tectonic evolution of the southern part of this Basin, at 39-40°30′S, based on study of 14 sedimentary sections. We provide evidence that this Basin underwent alternating erosion and deposition of reworked volcaniclastic material in continental and fluvial settings during the Neogene. In particular, basement uplift of the Sanico Massif, due to Late Miocene-Pliocene intensification of tectonic activity, led to sediment partitioning in the Basin. During this interval, sedimentation was restricted to the internal domain and the Collon Cura Basin evolved towards an endorheic Intermontane Basin. From stratigraphic interpretation, this Basin remained isolated 7-11 Myr. Nevertheless, ephemeral gateways seem to have existed, because we observe a thin succession downstream of the Sanico Massif contemporaneous with the Collon Cura Basin-fill sequence. Comparisons of stratigraphic, paleoenvironmental and tectonic features of the southern Neuquen Basin with other foreland Basins of South America allow us to classify it as a broken foreland with the development of an Intermontane Basin from Late Miocene to Late Pliocene. This implies a thick-skinned structural style for this Basin, with reactivation of basement faults responsible for exhumation of the Sanico Massif. Comparison of several broken forelands of South America allows us to propose two categories of Intermontane Basins according to their structural setting: subsiding or uplifted Basins, which has strong implications on their excavation histories.

Weilin Zhang - One of the best experts on this subject based on the ideXlab platform.

  • magnetostratigraphy of deep drilling core sg 1 in the western qaidam Basin ne tibetan plateau and its tectonic implications
    Quaternary Research, 2012
    Co-Authors: Weilin Zhang, Erwin Appel, Xiaomin Fang, Chunhui Song, Olaf A Cirpka
    Abstract:

    Abstract The Qaidam Basin is the largest Intermontane Basin of the northeastern Tibetan Plateau and contains a continuous Cenozoic sequence of lacustrine sediments. A ~ 1000-m-deep drilling (SG-1) with an average core recovery of ~ 95% was carried out in the depocenter of the Chahansilatu playa (sub-depression) in the western Qaidam Basin, aimed to obtain a high-resolution record of the paleoenvironmental evolution and the erosion history. Stepwise alternating field and thermal demagnetization, together with rock magnetic results, revealed a stable remanent magnetization for most samples, carried by magnetite. The polarity sequence consisted of 16 normal and 15 reverse zones which can be correlated with chrons 1n to 2An of the global geomagnetic polarity time scale. Magnetostratigraphic results date the entire core SG-1 at ~ 2.77 Ma to ~ 0.1 Ma and yielded sediment accumulation rate (SAR) ranging from 26.1 cm/ka to 51.5 cm/ka. Maximum SARs occurred within the intervals of ~ 2.6–2.2 Ma and after ~ 0.8 Ma, indicating two episodes of erosion, which we relate to pulse tectonic uplift of the NE Tibetan Plateau with subsequent global cooling.

Bertrand Fasentieux - One of the best experts on this subject based on the ideXlab platform.

  • Neogene tectonostratigraphic history of the southern Neuquén Basin (39°-40°30′S, Argentina): Implications for foreland Basin evolution
    Basin Research, 2015
    Co-Authors: Damien Huyghe, Cédric Bonnel, Bertrand Nivière, Bertrand Fasentieux, Yves Hervouët
    Abstract:

    Although the Neuquén Basin in Argentina forms a key transitional domain between the south-central Andes and the Patagonian Andes, its Cenozoic history is poorly documented. We focus on the sedimentologic and tectonic evolution of the southern part of this Basin, at 39-40°30′S, based on study of 14 sedimentary sections. We provide evidence that this Basin underwent alternating erosion and deposition of reworked volcaniclastic material in continental and fluvial settings during the Neogene. In particular, basement uplift of the Sañico Massif, due to Late Miocene-Pliocene intensification of tectonic activity, led to sediment partitioning in the Basin. During this interval, sedimentation was restricted to the internal domain and the Collon Cura Basin evolved towards an endorheic Intermontane Basin. From stratigraphic interpretation, this Basin remained isolated 7-11 Myr. Nevertheless, ephemeral gateways seem to have existed, because we observe a thin succession downstream of the Sañico Massif contemporaneous with the Collon Cura Basin-fill sequence. Comparisons of stratigraphic, paleoenvironmental and tectonic features of the southern Neuquén Basin with other foreland Basins of South America allow us to classify it as a broken foreland with the development of an Intermontane Basin from Late Miocene to Late Pliocene. This implies a thick-skinned structural style for this Basin, with reactivation of basement faults responsible for exhumation of the Sañico Massif. Comparison of several broken forelands of South America allows us to propose two categories of Intermontane Basins according to their structural setting: subsiding or uplifted Basins, which has strong implications on their excavation histories.

  • Neogene tectonostratigraphic history of the southern Neuquén Basin (39°–40°30′S, Argentina): implications for foreland Basin evolution
    Basin Research, 2014
    Co-Authors: Damien Huyghe, Cédric Bonnel, Bertrand Nivière, Bertrand Fasentieux, Yves Hervouët
    Abstract:

    Although the Neuquen Basin in Argentina forms a key transitional domain between the south-central Andes and the Patagonian Andes, its Cenozoic history is poorly documented. We focus on the sedimentologic and tectonic evolution of the southern part of this Basin, at 39-40°30′S, based on study of 14 sedimentary sections. We provide evidence that this Basin underwent alternating erosion and deposition of reworked volcaniclastic material in continental and fluvial settings during the Neogene. In particular, basement uplift of the Sanico Massif, due to Late Miocene-Pliocene intensification of tectonic activity, led to sediment partitioning in the Basin. During this interval, sedimentation was restricted to the internal domain and the Collon Cura Basin evolved towards an endorheic Intermontane Basin. From stratigraphic interpretation, this Basin remained isolated 7-11 Myr. Nevertheless, ephemeral gateways seem to have existed, because we observe a thin succession downstream of the Sanico Massif contemporaneous with the Collon Cura Basin-fill sequence. Comparisons of stratigraphic, paleoenvironmental and tectonic features of the southern Neuquen Basin with other foreland Basins of South America allow us to classify it as a broken foreland with the development of an Intermontane Basin from Late Miocene to Late Pliocene. This implies a thick-skinned structural style for this Basin, with reactivation of basement faults responsible for exhumation of the Sanico Massif. Comparison of several broken forelands of South America allows us to propose two categories of Intermontane Basins according to their structural setting: subsiding or uplifted Basins, which has strong implications on their excavation histories.