Orbitally-Tuned Sr Isotope Chemostratigraphy for the Late Middle to Late Miocene
isotope chemostratigraphy, oceanography, sedimentation rates, paleoceanography
Digital Object Identifier (DOI)
We present a Sr chemostratigraphic reference section for the late middle to late Miocene (14-5 Ma) from Ocean Drilling Program site 926 on the Ceara Rise. This site combines a precise, orbitally tuned timescale with a high sedimentation rate (15 m/m.y.), continuous deposition, and excellent biostratigraphic control. The Sr isotope curve is based on measurements of cleaned, planktonic foraminifera at 100-200 kyr sample intervals and it illustrates periods of rapid change in Sr-87/Sr-86 alternating with periods of little change. Chemostratigraphically-defined ages for these intervals can be determined within +/-0.8 m.y. and +/-1.6 m.y, respectively. There is excellent correlation with the published curve for site 588 [Hodell and Woodruff, 1994]; however the curve for site 747 [Oslick et al., 1994] exhibits less structure, which may be due to small errors in age estimates related to slow sedimentation rates, high-latitude fauna and an interval of complicated magnetics. Late Miocene data compare favorably with data from site 758 [Farrell et al., 1995].
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Citation / Publisher Attribution
Paleoceanography, v. 14, no. 1, p. 74-83.
Scholar Commons Citation
Martin, E. E.; Shackleton, N. J.; Zachos, J. C.; and Flower, Benjamin P., "Orbitally-Tuned Sr Isotope Chemostratigraphy for the Late Middle to Late Miocene" (1999). Marine Science Faculty Publications. 20.