Revisiting the Ceara Rise, Equatorial Atlantic Ocean; isotope stratigraphy of ODP Leg 154 from 0 to 5 Ma

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doi: 10.5194/cp-13-779-2017
Author(s): Wilkens, Roy H.; Westerhold, Thomas; Drury, Anna J.; Lyle, Mitchell; Gorgas, Thomas; Tian, Jun
Author Affiliation(s): Primary:
University of Hawaii, Hawaii Institute of Geophysics & Planetology, Honolulu, HI, United States
Other:
University of Bremen, Germany
Oregon State University, United States
German Research Centre for Geosciences, Germany
Tongji University, China
Volume Title: Climate of the Past
Source: Climate of the Past, 13(7), p.779-793. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. 34 refs.; illus.
Summary: Isotope stratigraphy has become the method of choice for investigating both past ocean temperatures and global ice volume. Lisiecki and Raymo (2005) published a stacked record of 57 globally distributed benthic δ18O records versus age (LR04 stack). In this study LR04 is compared to high-resolution records collected at all of the sites drilled during ODP Leg 154 on the Ceara Rise, in the western equatorial Atlantic Ocean. Newly developed software is used to check data splices of the Ceara Rise sites and better align out-of-splice data with in-splice data. Core images recovered from core table photos are depth and age scaled and greatly assist in the data analysis. The entire splices of ODP sites 925, 926, 927, 928 and 929 were reviewed. Most changes were minor although several were large enough to affect age models based on orbital tuning. A Ceara Rise composite record of benthic δ18O is out of sync with LR04 between 1.80 and 1.90 Ma, where LR04 exhibits two maxima but Ceara Rise data contain only one. The interval between 4.0 and 4.5 Ma in the Ceara Rise compilation is decidedly different from LR04, reflecting both the low amplitude of the signal over this interval and the limited amount of data available for the LR04 stack. A regional difference in benthic δ18O of 0.2 ppm relative to LR04 was found. Independent tuning of Site 926 images and physical property data to the Laskar et al. (2004) orbital solution and integration of available benthic stable isotope data from the Ceara Rise provides a new regional reference section for the equatorial Atlantic covering the last 5 million years.
Year of Publication: 2017
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Age; Atlantic Ocean; Benthic environment; Ceara Rise; Chemostratigraphy; Computer programs; Cores; Data processing; Deep Sea Drilling Project; Depth; East Pacific; Equatorial Atlantic; Equatorial Pacific; Image analysis; Imagery; Insolation; Isotope ratios; Isotopes; Leg 138; Leg 154; Leg 200; Magnetic properties; Magnetic susceptibility; North Atlantic; North Pacific; Northeast Pacific; O-18/O-16; ODP Site 925; ODP Site 926; ODP Site 927; ODP Site 928; ODP Site 929; Ocean Drilling Program; Oxygen; Pacific Ocean; Reflectance; Stable isotopes; Stratigraphy
Coordinates: N055834 N055834 W0434423 W0434423
N052719 N052719 W0434453 W0434453
N034309 N034309 W0425430 W0425430
N041215 N041216 W0432920 W0432922
N030000 N070000 W0390000 W0460000
Record ID: 2018003537
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany