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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2005. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/02160504111
Climatic significance of Holocene beachrock sites along shorelines of the Red Sea
Gerald M. Friedman
Northeastern Science Foundation, Inc., Rensselaer Center of Applied Geology, 15 Third Street, P.O. Box 746, Troy, New York 12181; [email protected]
ABSTRACT
Seaward-dipping prograding successions of beachrock of the shoreline of the rift valley of the Gulf of Aqaba, a steep-sided tectonic valley that forms the northern segment of the Red Sea, reflect progressive stages of cementation, which unravel a geologic history of the shoreline. The oxygen isotopic composition of Gulf of Aqaba beachrock, recorded by carbonate cement, reflects a temperature decrease of ambient seawater for approximately half of the Holocene.
The computed temperature excursion of the Red Sea beachrock cement implies a temperature decrease between the ages 7.07 
0.380 and 2.62 0.23 ka, an interval of approximately 4500 yr, during which the average Red Sea seawater temperature fell from 33 to 17
C. This discovery is at variance with the climate-change debate that involves increasing temperatures.
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