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Oyster shells as recorders of short-term oscillations of salinity and temperature during deposition of coral bioherms and reefs in the Miocene Lorca Basin, SE Spain

Gunnar Saelen, Ingelin Lokling Lunde, Kristin Walderhaug Porten, Juan C. Braga, Siv Hjorth Dundas, Ulysses Silas Ninnemann, Yuval Ronen and Michael Richard Talbot
Oyster shells as recorders of short-term oscillations of salinity and temperature during deposition of coral bioherms and reefs in the Miocene Lorca Basin, SE Spain
Journal of Sedimentary Research (June 2016) 86 (6): 637-667

Abstract

We use delta (super 18) O and delta (super 13) C of oyster shells, inferred seawater delta (super 18) O (delta (sub w) ), and temperature tolerance ranges of modern zooxanthellate coral communities to constrain and model paleo-salinities of marginal-marine waters of the Miocene Lorca Basin, Spain. Salinities ranged from 22 to 32 PSU during growth of coral bioherms and carpets of the Soriana and Parrilla formations, and from 35 to 39 PSU during deposition of the Hondo Formation reef complex. The periods with lower modeled salinities correspond with deltaic and alluvial-fan sedimentation in the area. The modeling is supported by (super 87) Sr/ (super 86) Sr data and provides new insights into the evolution of the local depositional settings. Departures of Sr-isotope values from the global oceanic curve occur within the intervals with the lowest modeled salinities, and the non-oceanic (super 87) Sr/ (super 86) Sr preserved in individual oyster shells was probably sourced from uplifted Aquitanian-Burdigalian limestones. (super 87) Sr/ (super 86) Sr values that plot along the global ocean Sr-isotope curve for the late Miocene indicate a Tortonian age for the upper part of the Soriana Formation and the Parrilla Formation, and a Messinian age for the Hondo Formation. More generally, we demonstrate how the chemical analyses of oyster shells provide additional information regarding short-term oscillations of salinity and temperature of seawater beyond what can be obtained by traditional paleoecological methods.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 86
Serial Issue: 6
Title: Oyster shells as recorders of short-term oscillations of salinity and temperature during deposition of coral bioherms and reefs in the Miocene Lorca Basin, SE Spain
Affiliation: University of Bergen, Department of Earth Science, Bergen, Norway
Pages: 637-667
Published: 201606
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 159
Accession Number: 2016-085194
Categories: Isotope geochemistrySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 5 tables, geol. sketch maps
N37°40'00" - N37°40'00", W01°42'00" - W01°42'00"
Secondary Affiliation: Universidad de Granada, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201641
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