Late Holocene sea-level rise in Tampa Bay: Integrated reconstruction using biomarkers, pollen, organic-walled dinoflagellate cysts, and diatoms
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Material Information

Title:
Late Holocene sea-level rise in Tampa Bay: Integrated reconstruction using biomarkers, pollen, organic-walled dinoflagellate cysts, and diatoms
Series Title:
Estuarine, Coastal and Shelf Science 86
Creator:
E.E Van Soelen
E.I. Lammertsma
H. Cremer
T.H. Donders
F. Sangiorgi
G.R. Brooks
R.A. Larson
J.S. Sinninghe Damste
F. Wagner-Cremer
G.J. Reichart
Affiliation:
Geological Survey of the Netherlands
Geological Survey of the Netherlands
Publisher:
Elsevier
Publication Date:
Language:
English

Notes

Abstract:
A suite of organic geochemical, micropaleontological and palynological proxies was applied to sediments from Southwest Florida, to study the Holocene environmental changes associated with sea-level rise. Sediments were recovered from Hillsborough Bay, part of Tampa Bay, and studied using biomarkers, pollen, organic-walled dinoflagellate cysts and diatoms. Analyses show that the site flooded around 7.5 ka as a consequence of Holocene transgression, progressively turning a fresh/brackish marl-marsh into a shallow, restricted marine environment. Immediately after the marine transgression started, limited water circulation and high amounts of runoff caused stratification of the water column. A shift in dinocysts and diatom assemblages to more marine species, increasing concentrations of marine biomarkers and a shift in the Diol Index indicate increasing salinity between 7.5 ka and the present, which is likely a consequence of progressing sea-level rise. Reconstructed sea surface temperatures for the past 4 kyrs are between 25 and 26 [degree] C, and indicate stable temperatures during the Late Holocene. A sharp increase in sedimentation rate in the top w50 cm of the core is attributed to human impact. The results are in agreement with parallel studies from the area, but this study further refines the environmental reconstructions having the advantage of simultaneously investigating changes in the terrestrial and marine environment.

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Source Institution:
Florida International University
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