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245 00 |a Sedimentary Evidence of Coastal Response to Holocene Sea-Level Change, Blackwater Bay, Southwest Florida |h [electronic resource] |y English.
260        |c 2009.
506        |a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights.
520 3    |a Studies of Holocene coastal sedimentary sequences in southwest Florida have provided important clues in determining coastal response to sea-level changes (Parkinson, 1989; Wanless et al., 1994). Much of the southwest Florida coast is a mangrovedominated estuarine system with chains of mangrove-capped oyster bars that provide a barrier between the bay and open marine influences. This low energy, low relief system provides an ideal environment for the deposition and preservation of sedimentary sequences that record relative sea-level fluctuations. The mangrove fringe is a major control on shoreline facies, as reported by Davis (1940) and summarized by Parkinson (1989), sometimes resulting in local shoreline changes in opposition to regional trends. In an early study of the southwest Florida coastal system, Davis (1940) described the sedimentation processes specific to mangrove dominated systems: the trapping of sediment results in rapid aggradation of peat, progradation of the shoreline, and local marine regression in a rising regional system (Parkinson, 1989). Conversely, mangrove control in these systems can actually allow the opposite effect, when the destruction of the vegetation in a storm or period of storm events causes shoreline retreat and a punctuated rise in relative sea level (Wanless et al., 1994). Initial studies of sedimentary sequences in southwest Florida (Davis, 1940) documented coastal submergence during relative sea-level rise. Later studies (Scholl et al., 1967, 1969) created a submergence curve for southwest Florida for the last 7000 years that delineated continual, but decelerating rise in sea level,which was later modified (Wanless et al., 1994) to assign specific rates of rise and dates of changes in rate (Figure 1). More recent work in the Everglades and Ten Thousand Islands regions presents a two-phase relative sea-level model within the decelerating eustatic system, consisting of (1) transgression with rapid eustatic rise, followed by (2) regression beginning at approximately 3200 y.b.p. as sea-level rise slowed and biogenic sedimentation kept pace with or outpaced eustatic rise (Parkinson,1987,1989). During June, 2001, a northeast/southwest transect of four sediment cores was taken, roughly perpendicular to the shoreline across Blackwater Bay (Figure 2) using a vibracore mounted on a pontoon boat. Coring recovered the entire Holocene sequence (units B, C, D in Figure 3), in addition to upper Pleistocene sediments (unit A), with negligible loss and little compaction. Preliminary descriptive analysis was performed with open cores during the summer, and subsequent lab analysis determined percent carbonate, organic content, and grain size. Based on these cores from Blackwater Bay, we believe that this portion of the southwest Florida shoreline has experienced three major phases of relative sea-level change during the Holocene eustatic rise: (1) transgression, (2) regression with accumulation of thick peat sequences, and (3) a return to transgression.
533        |a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software.
650    0 |a Climate change.
650    0 |a Sea level rise.
650    0 |a Coastal management.
650    0 |a Sediments (Geology).
651    0 |a Florida.
700 1    |a Lowery, Lily E..
830    0 |a dpSobek.
830    0 |a Sea Level Rise.
830    0 |a Florida Documents Collection.
830    0 |a South Florida Collection.
852        |a dpSobek |c Sea Level Rise
856 40 |u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15061883/00001 |y Click here for full text
992 04 |a http://dpanther.fiu.edu/sobek/content/FI/15/06/18/83/00001/FI15061883thm.jpg
997        |a Sea Level Rise


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