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    ALTEA data handling

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    Abstract
    Sand composition of arenite successions is sensitive to a suite of factors operating between initial grain production and final diagenesis on a variety of spatial and temporal scales. Seven allogenic factors, the relative importance of which relies upon the complex interaction between tectonics, eustasy, and climate, play a decisive role in dictating petrofacies distribution within siliciclastic to hybrid depositional sequences. These factors include (i) tectonic exhumation, (ii) physical and chemical rock breakdown, (iii) change in sediment flux, (iv) change in source/basin physiography, (v) shelf colonization by organisms, (vi) generation of chemical grains, and (vii) volcanism. Autogenic processes may locally have a considerable influence on the type and amount of sediment supplied to the basin, thus interfering with the external control. Based upon literature data, a conceptual framework of expected compositional changes across the key surfaces for sequence-stratigraphic interpretation is outlined. Two case histories, from the Miocene shelf-to-turbidite deposits of the northern Apennines and the Quaternary alluvial-to-nearshore succession of the Adriatic coast, respectively, are used as references to illustrate how arenite petrofacies changes can be framed into a sequence-stratigraphic scheme on multiple timescales.
    Article Outline
    1. Introduction
    2. Allogenic factors controlling changes in arenite composition
    2.1. Tectonic exhumation
    2.2. Physical and chemical rock breakdown
    2.3. Change in sediment flux
    2.4. Change in source/basin physiography
    2.5. Shelf colonization by organisms
    2.6. Generation of chemical grains
    2.7. Volcanism
    3. Autogenic factors controlling changes in arenite composition
    3.1. Fluvial-channel avulsion and river capture
    3.2. Sediment compaction and differential subsidence
    3.3. Provenance mixing and sediment dilution
    3.4. Hydraulic sorting
    4. Compositional changes in a sequence-stratigraphic framework
    4.1. Lack of compositional change across sequence boundary
    4.2. Compositional change across sequence boundary
    4.3. Different compositional changes across the same sequence boundary
    4.4. Similar compositional change across different sequence boundaries
    4.5. Compositional change across systems tract boundary
    4.6. Compositional change across facies tract boundary
    5. Case studies
    5.1. Shelf to deep-marine deposits: the Miocene epi-Ligurian succession of the Northern Apennines
    5.2. Alluvial to nearshore deposits: the late Quaternary succession of the Adriatic coastal plain
    6. Conclusions
    Acknowledgements
    References

     

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