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Lofi Johanna - One of the best experts on this subject based on the ideXlab platform.

  • Discovery of vast Fluvial Deposits provides evidence for drawdown during the late Miocene Messinian salinity crisis
    'Geological Society of America', 2019
    Co-Authors: Madof, Andrew S., Bertoni Claudia, Lofi Johanna
    Abstract:

    International audienceThe late Miocene Messinian salinity crisis (MSC) was a significant oceanographic event that caused widespread evaporitic accumulation throughout the Mediterranean Basin. Although multiple hypotheses exist regarding the origin of evaporitic and post-evaporitic Deposits, researchers remain divided on the magnitude of base-level fall, and on whether these accumulations record deep-water or non-marine conditions. Here, we introduce a previously unknown, upper Messinian Fluvial Deposit comparable in size to the late Miocene Nile River Fluvial valley fill and show that near-complete desiccation of the eastern Mediterranean was responsible for its development. The basin-wide accumulation, which is located offshore Cyprus, Syria, Lebanon, and Israel, lies directly atop deep-basin evaporites and related erosional surfaces, and is one of the largest known riverine Deposits associated with the terminal MSC. From marked onshore incision and basinward thinning trends, the source of the accumulation is presumed to be a formerly unidentified drainage basin in southern Turkey and western Syria; the Deposit extends > 500 km into the western Levant Basin, where its Depositional sink is marked by six well-developed backstepping lobes. Based on the Deposit's seismic stratigraphy and morphology, which provide clear evidence of subaerial exposure, we question current hypotheses proposing a deepwater origin for late Messinian accumulations. We also draw specific attention to the development of extensive circum-Mediterranean nonmarine conditions prior to Zanclean marine transgression, and to the previously overlooked role of Fluvial systems in diluting hypersaline lakes in evaporitic basins

Lofi J - One of the best experts on this subject based on the ideXlab platform.

  • Discovery of vast Fluvial Deposits provides evidence for drawdown during the late Miocene Messinian salinity crisis
    'Geological Society of America', 2019
    Co-Authors: As Madof, Bertoni C, Lofi J
    Abstract:

    The late Miocene Messinian salinity crisis (MSC) was a significant oceanographic event that caused widespread evaporitic accumulation throughout the Mediterranean Basin. Although multiple hypotheses exist regarding the origin of evaporitic and post-evaporitic Deposits, researchers remain divided on the magnitude of base-level fall, and on whether these accumulations record deep-water or non-marine conditions. Here, we introduce a previously unknown, upper Messinian Fluvial Deposit comparable in size to the late Miocene Nile River Fluvial valley fill and show that near-complete desiccation of the eastern Mediterranean was responsible for its development. The basin-wide accumulation, which is located offshore Cyprus, Syria, Lebanon, and Israel, lies directly atop deep-basin evaporites and related erosional surfaces, and is one of the largest known riverine Deposits associated with the terminal MSC. From marked onshore incision and basinward thinning trends, the source of the accumulation is presumed to be a formerly unidentified drainage basin in southern Turkey and western Syria; the Deposit extends >500 km into the western Levant Basin, where its Depositional sink is marked by six well-developed backstepping lobes. Based on the Deposit’s seismic stratigraphy and morphology, which provide clear evidence of subaerial exposure, we question current hypotheses proposing a deep-water origin for late Messinian accumulations. We also draw specific attention to the development of extensive circum-Mediterranean non-marine conditions prior to Zanclean marine transgression, and to the previously overlooked role of Fluvial systems in diluting hypersaline lakes in evaporitic basins

Gisele Barbosa Dos Santos - One of the best experts on this subject based on the ideXlab platform.

  • OSL dating of sediments from a mountainous river in southeastern Brazil: Late Cenozoic tectonic and climatic implications
    Geomorphology, 2011
    Co-Authors: Antônio Pereira Magalhães Júnior, Luis Felipe Soares Cherem, Luiz Fernando De Paula Barros, Gisele Barbosa Dos Santos
    Abstract:

    Abstract The upper Das Velhas River basin is located in the central portion of the Quadrilatero Ferrifero in southeastern edge of Sao Francisco Craton, southeastern Brazil. Its drainage network has a strong lithostructural influence and mountainous river segments crossing different tectonic blocks. The neotectonic activity in this cratonic edge is associated with epirogenetic Brazilian Shield uplift and with local and regional differential movements of crustal blocks due to WNW migration of South-American plate. This process cause an intraplate transfer of tectonic efforts, forcing the reactivation of old faults (NW-SE and NE-SW) and the generation of recent ones (E-W). Using optically stimulated luminescence (OSL) dating and Fluvial Deposit data, this paper focuses on the late Cenozoic evolution of this mountainous river basin, relating it to tectonic and climatic forcing. Even with few records of ancient alluvial Deposits as a result of intense dissection, three levels of river terraces were identified in some sites along the valley: a higher terrace level (T3), a cut-in-bedrock terrace of ~ 48 ka; an intermediate terrace level (T2) of ~ 7.5 ka; and a lower terrace level (T1), of ~ 1 ka. The T2 is found along the valley as a cut-in-bedrock terrace or as a fill terrace, and is found T1 as a cut-in-bedrock terrace or as a nested fill terrace or even overlapping T2 sediments. The diverse relation between these terraces may be related to unequal Fluvial downcutting. We identified three main downcutting periods: (i) before T3; (ii) from T3 to T2, related to Late Pleistocene regional tectonics; and (iii) from T2 to T1, which was a response to tectonics and climate change in the early Holocene. These stages of more intense downcutting should be a response to uplift pulses. In the most active blocks, cut-in-bedrock terraces show a greater unevenness in relation to lower levels, while in the most stable blocks, T1 is found as a nested fill terrace or overlapping T2.

Madof, Andrew S. - One of the best experts on this subject based on the ideXlab platform.

  • Discovery of vast Fluvial Deposits provides evidence for drawdown during the late Miocene Messinian salinity crisis
    'Geological Society of America', 2019
    Co-Authors: Madof, Andrew S., Bertoni Claudia, Lofi Johanna
    Abstract:

    International audienceThe late Miocene Messinian salinity crisis (MSC) was a significant oceanographic event that caused widespread evaporitic accumulation throughout the Mediterranean Basin. Although multiple hypotheses exist regarding the origin of evaporitic and post-evaporitic Deposits, researchers remain divided on the magnitude of base-level fall, and on whether these accumulations record deep-water or non-marine conditions. Here, we introduce a previously unknown, upper Messinian Fluvial Deposit comparable in size to the late Miocene Nile River Fluvial valley fill and show that near-complete desiccation of the eastern Mediterranean was responsible for its development. The basin-wide accumulation, which is located offshore Cyprus, Syria, Lebanon, and Israel, lies directly atop deep-basin evaporites and related erosional surfaces, and is one of the largest known riverine Deposits associated with the terminal MSC. From marked onshore incision and basinward thinning trends, the source of the accumulation is presumed to be a formerly unidentified drainage basin in southern Turkey and western Syria; the Deposit extends > 500 km into the western Levant Basin, where its Depositional sink is marked by six well-developed backstepping lobes. Based on the Deposit's seismic stratigraphy and morphology, which provide clear evidence of subaerial exposure, we question current hypotheses proposing a deepwater origin for late Messinian accumulations. We also draw specific attention to the development of extensive circum-Mediterranean nonmarine conditions prior to Zanclean marine transgression, and to the previously overlooked role of Fluvial systems in diluting hypersaline lakes in evaporitic basins

As Madof - One of the best experts on this subject based on the ideXlab platform.

  • Discovery of vast Fluvial Deposits provides evidence for drawdown during the late Miocene Messinian salinity crisis
    'Geological Society of America', 2019
    Co-Authors: As Madof, Bertoni C, Lofi J
    Abstract:

    The late Miocene Messinian salinity crisis (MSC) was a significant oceanographic event that caused widespread evaporitic accumulation throughout the Mediterranean Basin. Although multiple hypotheses exist regarding the origin of evaporitic and post-evaporitic Deposits, researchers remain divided on the magnitude of base-level fall, and on whether these accumulations record deep-water or non-marine conditions. Here, we introduce a previously unknown, upper Messinian Fluvial Deposit comparable in size to the late Miocene Nile River Fluvial valley fill and show that near-complete desiccation of the eastern Mediterranean was responsible for its development. The basin-wide accumulation, which is located offshore Cyprus, Syria, Lebanon, and Israel, lies directly atop deep-basin evaporites and related erosional surfaces, and is one of the largest known riverine Deposits associated with the terminal MSC. From marked onshore incision and basinward thinning trends, the source of the accumulation is presumed to be a formerly unidentified drainage basin in southern Turkey and western Syria; the Deposit extends >500 km into the western Levant Basin, where its Depositional sink is marked by six well-developed backstepping lobes. Based on the Deposit’s seismic stratigraphy and morphology, which provide clear evidence of subaerial exposure, we question current hypotheses proposing a deep-water origin for late Messinian accumulations. We also draw specific attention to the development of extensive circum-Mediterranean non-marine conditions prior to Zanclean marine transgression, and to the previously overlooked role of Fluvial systems in diluting hypersaline lakes in evaporitic basins