Mearon, Sarah et al. (2003): Cretaceous strontium isotope stratigraphy using marine barite

Leg/Site/Hole:
ODP 123
DSDP 32
DSDP 32 305
ODP 123 766
Identifier:
2003-014296
georefid
10.1130/0091-7613(2003)031<0015:CSISUM>2.0.CO;2
doi
Creator:
Mearon, Sarah
Stanford University, Department of Geological and Earth Sciences, Stanford, CA, United States
author
Paytan, Adina
University of North Carolina, United States
author
Bralower, Timothy J.
author
Identification:
Cretaceous strontium isotope stratigraphy using marine barite
2003
Geology (Boulder)
Geological Society of America (GSA), Boulder, CO, United States
31
1
15-18
The strontium isotope ratios ( (super 87) Sr/ (super 86) Sr) of marine barite microcrystals separated from Cretaceous sedimentary deposits from Ocean Drilling Program and Deep Sea Drilling Project sites from the Pacific and Indian Oceans have been compared to the composite Sr isotope curve of McArthur et al. The barite in these cores accurately recorded the seawater (super 87) Sr/ (super 86) Sr ratio, thereby reaffirming the composite Cretaceous strontium curve. Moreover, marine barite is a more reliable recorder of (super 87) Sr/ (super 86) Sr than is carbonate in sedimentary deposits with high clay content, thereby providing an opportunity for Sr isotope stratigraphy and dating in carbonate-poor or diagenetically altered sections. We have used the barite-derived Sr isotope record to refine the biostratigraphic age models of the sites investigated.
English
Serial
Coverage:Geographic coordinates:
North:32.0008
West:110.2714East: 157.5101
South:-19.5556
Stratigraphy; Isotope geochemistry; alkaline earth metals; barite; chemostratigraphy; cores; Cretaceous; Deep Sea Drilling Project; diagenesis; DSDP Site 305; experimental studies; geochemistry; Indian Ocean; isotope ratios; isotopes; Leg 123; Leg 32; marine environment; marine sediments; Mesozoic; metals; Ocean Drilling Program; ODP Site 766; Pacific Ocean; sediments; SEM data; Sr-87/Sr-86; stable isotopes; strontium; sulfates;
.