کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4736971 1640915 2011 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sea-level history of the past two interglacial periods: new evidence from U-series dating of reef corals from south Florida
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Sea-level history of the past two interglacial periods: new evidence from U-series dating of reef corals from south Florida
چکیده انگلیسی

As a future warm-climate analog, much attention has been directed to studies of the Last Interglacial period or marine isotope substage (MIS) 5.5, which occurred ∼120,000 years ago. Nevertheless, there are still uncertainties with respect to its duration, warmth and magnitude of sea-level rise. Here we present new data from tectonically stable peninsular Florida and the Florida Keys that provide estimates of the timing and magnitude of sea-level rise during the Last Interglacial period. The Last Interglacial high sea stand in south Florida is recorded by the Key Largo Limestone, a fossil reef complex, and the Miami Limestone, an oolitic marine sediment. Thirty-five new, high-precision, uranium-series ages of fossil corals from the Key Largo Limestone indicate that sea level was significantly above present for at least 9000 years during the Last Interglacial period, and possibly longer. Ooids from the Miami Limestone show open-system histories with respect to U-series dating, but show a clear linear trend toward an age of ∼120 ka, correlating this unit with the Last Interglacial corals of the Key Largo Limestone. Older fossil reefs at three localities in the Florida Keys have ages of ∼200 ka and probably correlate to MIS 7. These reefs imply sea level near or slightly above present during the penultimate interglacial period. Elevation measurements of both the Key Largo Limestone and the Miami Limestone indicate that local (relative) sea level was at least 6.6 m, and possibly as much as 8.3 m higher than present during the Last Interglacial period.

Research highlights
► The Last Interglacial period is a possible future warm-climate analog.
► Tectonically stable Florida provides a good record of this period.
► In Florida, this high sea level lasted at least 9000 years and was 7 to 8 m above present.
► It is likely both Greenland and Antarctica contributed to this high sea stand.
► Sea-level rise of this magnitude would inundate significant areas around the world.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 30, Issues 5–6, March 2011, Pages 570–590
نویسندگان
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