Detrital modes of recent deep-sea sands and their relation to tectonic setting: a first approximation

ABSTRACT Complete petrographic analyses of modern deep‐sea sands are surprisingly rare, but are needed if problems such as the influence of tectonics on petrology, or changes in petrology due to diagenesis, are to be understood in ancient sandstones. This paper is a first attempt, using data from ou...

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Veröffentlicht in:Sedimentology 1981-01, Vol.28 (1), p.75-83
Hauptverfasser: VALLONI, RENZO, MAYNARD, J. BARRY
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description ABSTRACT Complete petrographic analyses of modern deep‐sea sands are surprisingly rare, but are needed if problems such as the influence of tectonics on petrology, or changes in petrology due to diagenesis, are to be understood in ancient sandstones. This paper is a first attempt, using data from our own study of 80 sands plus data from the literature, to establish a baseline for modern deep‐sea sands with which ancient sandstones can be compared. We assigned sands to five plate‐tectonic categories, each of which has a distinct average petrologic composition: (1) basins associated with trailing‐edge continental margins, Q62F26L12; (2) with leading‐edge continental margins, either subduction, Q16F53L31, or (3) strike‐slip, Q34F39L27; (4) back‐arc basins, Q20F29L51; (5) fore‐arc basins, Q8F17L75. The amount and type of lithic fragments and the type of feldspar are particularly important discriminators, the amount of quartz less so. Trailing‐edge and fore‐arc basins have quite distinctive compositions, but back‐arc basins and basins near the two types of leading‐edge margins show some overlap, and thus may be hard to differentiate in ancient sandstones.
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title Detrital modes of recent deep-sea sands and their relation to tectonic setting: a first approximation
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