[pccgrads] Droxler on "Deglacial Origin of Barrier Reefs" Mon 5/12 at 12:30 in MSB 123

uwpcc uwpcc at u.washington.edu
Wed May 7 08:25:25 PDT 2014

Speaker Andre Droxler (Rice University)

May 12, 2014
12:30 -1:30
in MSB 123

Because the initial phase of barrier reef evolution is often buried under
more recent phases of coralgal growth, the origins of modern barrier reefs
have remained elusive. Direct observations on the nature of the substrate on
top of which barrier reefs have developed are lacking, and simple questions
about whether the substrate contributes to their overall linear morphology
have remained unanswered. We present here a review dedicated to
late-Quaternary shelf-edge deposition in tropical mixed
siliciclastic-carbonate systems. These modern analogs are used to develop a
quantitative understanding of shelf edge barrier reef formation during
different segments of relatively well established sea-level cycles. The
onset of rapid sea-level rise during early deglaciations, when
siliciclastics were deposited along newly formed coasts at up-dip positions,
provided opportune time windows for coralgal communities to establish
themselves on top of maximum lowstand siliciclastic coastal deposits, such
as beach ridges and lowstand shelf-edge deltas.

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