Gostlin, K. E.; McCarthy, F. M. G. (1998): Palynomorphs as sequence stratigraphic markers across a marine transect at a siliciclastic passive margin. Geological Society of America (GSA), Boulder, CO, United States, In: Anonymous, Geological Society of America, 1998 annual meeting, 30 (7), 365, georefid:1999-024719
Abstract:
We used palynomorphs as proxies of particle transport onto and across the continental margin. The ratio of terrestrial spores and pollen to dinoflagellate cysts (P:D) allows the degree of terrestrial vs. marine influence to be estimated. Sediments with higher P:D ratios record periods of higher terrestrial influence (normally periods of lower sea level). Oxygen isotope data and derived eustatic sea level curves (e.g. Haq et. al.) give little information regarding local sedimentation patterns. Palynomorphs are ideal paleoenvironmental and biostratigraphic indicators in siliciclastic margin sediments because of their abundance, resistance to degradation, and relative ease of identification. We compared a detailed P:D analysis with geophysical and sedimentological data from ODP Sites 1072A (98 m water depth) and 1073A (640 m water depth) on the New Jersey margin in an attempt to explain continental margin architecture and test some basic concepts of sequence stratigraphy. P:D peaks on continental margins coincide with major seismic reflectors and P:D values are lowest within sediments which mark the highstand. P:D peaks in deep sea sediments represent the sediments that have been eroded from the shelf during the lowstand, and thus correlate with the unconformities on the shelf. Similar middle to late Pleistocene records appear to have been preserved at ODP Sites 1072A and 1073A above reflector pp3(s), supporting the synchroneity of this reflector on the outer shelf and upper slope. However, the record between reflector pp4(s) and pp3(s) differs substantially, recording greater erosion on the shelf during the middle Pleistocene and greater erosion on the slope during the early Pleistocene.
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West: -80.0000 East: 20.0000 North: 75.0000 South: -60.0000
West: NaN East: NaN North: NaN South: NaN
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