ODP Site 758 Strontium Isotopes Data Set: Readme file
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                   NOAA Paleoclimatology Program
                                 and
               World Data Center A- Paleoclimatology
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NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!!

CONTRIBUTORS: John Farrell and Steven Clemens, Brown University
IGBP PAGES/WDCA Data Contribution Series #:  95-006
NAME OF DATA SET: ODP Site 758 Strontium Isotopes Data Set 
LAST UPDATE: 5/95 (Original receipt date by NOAA Paleo) 
GEOGRAPHIC REGION: 5'23"N, 90'21"E (Indian Ocean)
PERIOD OF RECORD: 0-6.9 MYBP
LIST OF FILES: SRTABLES.xls(Microsoft Excel worksheet),  SRTABLES.csv
(comma-separated values text file of the same data), Readme(this file).

DESCRIPTION:
Strontium isotopes were measured on the acetic acid-soluble portions of
five to ten hand-picked and ultrasonically cleaned planktonic foraminifera
(425 µm), following procedures in Clemens et al. (1993). The external
error associated with replicate analyses of SRM-987 is ±0.000 019 (2 s.d.,
n = 136). To estimate the external precision of samples, we performed 233
replicate analyses from raw sample for a total of 688 analyses. Each
replicate was passed through the entire chemical procedure. The resulting
standard deviation (±0.000 021; 2 s.d.) agrees well with the value
calculated from standards.  All Sr isotope ratios are normalized to value
of 0.1194 for 86Sr/88Sr and are reported relative to 87Sr/86Sr value for
SRM-987 of 0.710257.

We are supplying "meters composite depth", a depth scale created by the
authors (see reference 3 for details).  This scale is based on a composite
sedimentary sequence that was constructed for the drill site by patching
together sedimentary intervals from the many cores drilled there.  The
composite depth is stratigraphically continuous and complete.

Age for the data  is provided, in Ma.  Age control is primarily from
paleomagnetic stratigraphy.  Note, we are providing age on two different
timescales, that of Shackleton et al., 1995 (ODP Leg 138) and that of
Berggren et al., 1985. Additional age control  from oxygen isotope
stratigraphy (0 to 3.6 Ma) (Farrell and Janecek, 1991; Chen et al., 1995) 
and laser 40Ar/39Ar dating of two ash layers (Hall and Farrell, 
EPSL, 1995 in press).

ODP758 core information:
Location: 5'23"N, 90'21"E (Indian Ocean)
Depth (meters below sea level):   2925
Type of core:  APC Advanced hydraulic piston core
Date collected (MM/DD/YY):  6/12/1988
Current location of core:     ODP, Texas A&M, College Station, TX


ORIGINAL REFERENCES:
Farrell, J.W., Clemens, S.C., Gromet, L.P., 1995.  Improved
chronostratigraphic reference curve of late Neogene seawater 87Sr/86Sr.
Geology, v. 23, no. 5, p. 403-406.

Clemens, S.C., Farrell, J.W., and Gromet, L.P., 1993, Synchronous changes
in seawater strontium isotope composition and global climate: Nature, v.
363, p. 607-610.

Farrell, J.W., and Janecek, T.R., 1991, Late Neogene paleoceanography and
paleoclimatology of the northeast Indian Ocean (ODP Site 758), in
Proceedings, Ocean Drilling Program, scientific results, Volume 121: College
Station, Texas, Ocean Drilling Program, p. 297-355.

Chen, J., Farrell, J. W., Murray, D. W., and Prell, W. L., 1995, A 3.6 m.y.
oxygen isotope time scale from ODP Site 758 and its paleoceanographic
implications: Paleoceanography, v. 10:21-47

SUGGESTED DATA CITATION:
Farrell, J., 1995, 87Sr/86Sr Data, ODP758.  IGBP PAGES/World Data Center-A for
Paleoclimatology Data Contribution Series # 95-006.  NOAA/NGDC Paleoclimatology Program,
Boulder CO, USA.