Although
that dastardly diagenesis plays a role, many of the same depositional factors
that control sequence stratigraphy also influence the composition of sandy sediment
within those sequences. Taking this concept as a starting point, Tentori and others unravel
relationships between siliciclastic sediment composition (petrofacies) and
sequence stratigraphic systems tracts of the Quaternary sedimentary succession
of the Roman Basin. The results document different quartz/feldspar and
quartz/lithic ratios, and textural changes, among systems tracts. These
changes are interpreted to represent the influences of hydraulic sorting (by
various processes among systems tracts) and post-depositional in situ weathering,
and are linked to tectonics, volcanism, and relative changes in sea
level. The data show how a sedimentary petrographic approach can be used
to derive information on the stage evolution of a sedimentary succession
through time. These results might be directly applicable to petroleum
exploration and production in wave-dominated deltaic succession.
Sand compositional changes as a support for
sequence-stratigraphic interpretation: the middle upper Pleistocene to Holocene
deposits of the Roman Basin (Rome, Italy) by Daniel Tentori,
Kathleen M. Marsaglia, and Salvatore Milli
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