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Long-term Late Cretaceous oxygen- and carbon-isotope trends and planktonic foraminiferal turnover; a new record from the southern midlatitudes

Francesca Falzoni, Maria Rose Petrizzo, Leon J. Clarke, Kenneth G. MacLeod and Hugh C. Jenkyns
Long-term Late Cretaceous oxygen- and carbon-isotope trends and planktonic foraminiferal turnover; a new record from the southern midlatitudes
Geological Society of America Bulletin (May 2016) 128 (11-12): 1725-1735

Abstract

The approximately 35-m.y.-long Late Cretaceous greenhouse climate has been the subject of a number of studies, with emphasis on the Cenomanian-Turonian and late Campanian-Maastrichtian intervals. By contrast, far less information is available for the Turonian-early Campanian interval, even though it encompasses the transition out of the extreme warmth of the Cenomanian-Turonian greenhouse climate optimum and includes an approximately 3-m.y.-long mid-Coniacian-mid-Santonian interval when planktonic foraminifera underwent a large-scale, but poorly understood, turnover. This study presents approximately 1350 delta (super 18) O and delta (super 13) C values of well-preserved benthic and planktonic foraminifera and of the <63 mu m size fraction from the Exmouth Plateau off Australia (eastern Indian Ocean). These data provide: (1) the most continuous, highly resolved, and stratigraphically well-constrained record of long-term trends in Late Cretaceous oxygen- and carbon-isotope ratios from the southern midlatitudes, and (2) new information on the paleoecological preferences of planktonic foraminiferal taxa. The results indicate persistent warmth from the early Turonian until the mid-Santonian, cooling from the mid-Santonian through the mid-Campanian, and short-term climatic variability during the late Campanian-Maastrichtian. Moreover, our results suggest the cause of Coniacian-Santonian turnover among planktonic foraminifera may have been the diversification of a temperature- and/or salinity-tolerant genus (Marginotruncana), and the cause of the Santonian-early Campanian extinction of Dicarinella and Marginotruncana may have been surface-ocean cooling and competition with globotruncanids.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 128
Serial Issue: 11-12
Title: Long-term Late Cretaceous oxygen- and carbon-isotope trends and planktonic foraminiferal turnover; a new record from the southern midlatitudes
Affiliation: Universita degli Studi di Milano, Dipartimento di Scienze della Terra "A. Desio", Milan, Italy
Pages: 1725-1735
Published: 20160525
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 79
Accession Number: 2016-076916
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2016139
Illustration Description: illus. incl. geol. sketch map
S19°53'15" - S19°53'14", E112°15'14" - E112°15'15"
Secondary Affiliation: Manchester Metropolitan University, GBR, United KingdomUniversity of Missouri at Columbia, USA, United StatesUniversity of Oxford, GBR, United Kingdom
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 the Geological Society of America, Boulder, CO, United States
Update Code: 201637
Program Name: ODPOcean Drilling Program
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