SEMINAR: Reminder: Mitch Harris's talk at 3 pm on Friday

["Amanda Oehlert" <aoehlert@rsmas.miami.edu>]

***THIS Friday June 18th, in the CIMAS Conference Room (MSC 301)

Paul M. (Mitch) Harris
Chevron Energy Technology Company
San Ramon, CA

at 3:00 pm, for a presentation titled:

Delineating and Quantifying Depositional Facies Patterns of Modern
Carbonate Sand Deposits on Great Bahama Bank


Abstract: Three sand deposits on Great Bahama Bank (GBB), which show a
range of depositional facies patterns, are quantitatively interrogated
to broaden our perspective of the types of information that can be
derived from studies of the modern. Rimming the southern end of Tongue
of the Ocean (TOTO) is the broadest expanse of "high-energy" sands found
in the Bahamas characterized by narrow sandbars separated by wide, deep
channels and a lack of islands. A variation of the tidal bar motif with
broader and more irregular sandbars, relatively narrow channels, and few
small islands occurs at the northern end of Exuma Sound (Schooners).
Sands associated with tidal channels and the numerous islands of the
Exumas chain along the western edge of Exuma Sound occur primarily as
flood tidal deltas.

Each carbonate sand body is analyzed for size and then further
differentiated by selecting different water depth intervals to define
sandbars and bar crests. The TOTO sand body covers 3120 km2 with
sandbars extending onto the shallow platform up to 27 km, whereas that
of Schooners covers 716 km2 with sandbars up to 17 km long. That part of
the Exumas examined here is a 450 km2 linear belt with flood tidal delta
lobes extending up to 8 km onto the platform.  The portion of each sand
body that is occupied by sandbars varies from ~ 15% - 20%.  Size, shape,
and centerlines are measured or calculated for the sandbars and analyzed
spatially for interrelationships.  Profiles and spatial analysis tools
enable sand body and channel spacing, position relative to the platform
margin, connectedness, and density to be characterized.  Relationships
are identified that link the size and shape of sandbars, their depths
with regard to proximity to the platform edge, and mean separating
distances between adjacent bars.


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