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Strontium isotopic-paleontological method as a high-resolution paleosalinity tool for lagoonal environments

Eduard G. Reinhardt, Daniel Jean Stanley and R. Timothy Patterson
Strontium isotopic-paleontological method as a high-resolution paleosalinity tool for lagoonal environments
Geology (Boulder) (November 1998) 26 (11): 1003-1006

Abstract

A combined strontium isotopic ( (super 87) Sr/ (super 86) Sr) and paleontological method is newly applied to a modern lagoon in Egypt's Nile River delta to test its applicability as a paleosalinity proxy. Analyses of 22 surficial samples collected throughout the lagoon include 81 Sr isotopic analyses of mollusks, foraminifera, ostracods, barnacles, bryozoans, serpulid worm tubes, pore water, and gypsum crystals. Two salinity groups are distinguished in each sample: a lower salinity group ( approximately 1 ppt) mixed with a higher salinity group ( approximately 3-10 ppt) that, respectively, are interpreted as the modern biocoenosis and an older relict fauna. The relict fauna denotes higher salinity conditions in the lagoon prior to closure of the Aswan High Dam (1964), and the modern fauna records freshening of the lagoon. Recent decreased salinity is a response to regulated Nile River flow and increased discharge into Manzala of fresh water via canals and drains. Quantification of this short-term salinity change holds promise for study of modern lagoons in other world settings, and may provide paleoclimatic information for older lagoon sequences in the Nile River delta and the geologic record.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 26
Serial Issue: 11
Title: Strontium isotopic-paleontological method as a high-resolution paleosalinity tool for lagoonal environments
Affiliation: Dalhousie University, Department of Earth Sciences, Halifax, NS, Canada
Pages: 1003-1006
Published: 199811
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 22
Accession Number: 1999-000418
Categories: Quaternary geologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N32°00'00" - N33°00'00", E32°00'00" - E32°30'00"
Secondary Affiliation: Smithsonian Institution, USA, United StatesCarleton University, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199901
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