Equatorial Pacific 800KYr Foraminiferal Amino Acid Racemization Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Equatorial Pacific 800KYr Foraminiferal Amino Acid Racemization Data LAST UPDATE: 5/2011 (Original receipt by WDC Paleo) CONTRIBUTORS: King, K., Jr., C. Neville, and J. Wehmiller. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2011-071 WDC PALEO CONTRIBUTION SERIES CITATION: King, K., Jr. and C. Neville. 2011. Equatorial Pacific 800KYr Foraminiferal Amino Acid Racemization Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2011-071. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: King, K., Jr. and C. Neville. 1977. Isoleucine Epimerization for Dating Marine Sediments: Importance of Analyzing Monospecific Foraminiferal Samples. Science, New Series, Vol. 195, No. 4284, pp. 1333-1335, Mar. 25, 1977. ABSTRACT: The rate of isoleucine epimerization in fossil planktonic foraminifera is strongly species-dependent. Alloisoleucine/ isoleucine ratios of two species of the same age can vary by more than a factor of 2. This finding, in combination with the known temporal and spatial variability of foraminiferal assemblages, demonstrates the critical importance of basing geochronological studies of marine sediments on monospecific samples. One rapidly epimerizing species generates a calibration curve of potentially high precision for dating sediments between the ages of about 50,000 to 400,000 years. GEOGRAPHIC REGION: Equatorial western Pacific Ocean PERIOD OF RECORD: 800 KYrBP - present FUNDING SOURCES: US National Science Foundation (DES72-01571, DES75-18136, IDOE GX 28671) DESCRIPTION: Amino acid racemization (epimerization) in foraminifera from western equatorial Pacific Ocean core V28-238. Concentration and D-alloisoleucine/L-isoleucine values from two taxa of foraminfera. Core Latitude Longitude WaterDepth(m) V28-238 1.017 -160.48 3120 LABORTAORY AND ANALYTICAL INFORMATION Lab history Lamont-Doherty Geological Observatory (LDGO) Lab PI King, K., Jr. Preparation date 1970-1975 Pretreatment Sieve >62 µm, sonication, 1% sodium hexametaphosphate, distilled water wash AA fraction THAA Hydrolysis procedure 22 hr, 110°C in 6 M HCl under N2 Bleach No Analytical method IELC Instrumental programming Buffer gradient; concentrations based on separate chromatograms of standards Area or height ratio Area Blank corrections none Response factors none Data screening criteria none Interlab comparisons none SAMPLE LOCATION INFORMATION Country or ocean Pacific State or province or sea Locality descriptors Lat (°) 1.017 Lon (°) 160.48 Coordinate precision Datum Elevation, m -3120 Elevation precision SAMPLE MATERIAL AND CONTEXT Material type Foraminifera Genus = Genus Species = species Number of individuals Field context marine Field context core Field context stratified section Collection date Collector King Sample PI King Stratigraphic unit or age Numerical age = APPROX AGE, Ma Field ID = SITE NAME Field ID 1 = CORE DEPTH (cm) Field ID 2 Sample ID Fraction of shell Sample position RESULTS Lab code LDGO Lab ID Number of chromatograms 2 Sample or analytical qualsee reference A/I = Alloisoleucine/Isoleucine Free field 1 = Alloisoleucine, nmole/gm Free field 2 = Isoleucine, nmole/gm DATA: LabCode SampleNumber Ocean Site CoreDepth Lat.°N Lon.°W WaterDepth SampleType Genus Species Approx.Age A/I Alloisoleucine Isoleucine cm. m. ka (nM/g) (nM/g) LDGO V28-238 0 Pacific V28-238 0 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 1 0.03 2.5 97.0 LDGO V28-238 100 Pacific V28-238 100 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 67 0.06 6.1 96.9 LDGO V28-238 200 Pacific V28-238 200 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 134 0.12 9.4 81.5 LDGO V28-238 300 Pacific V28-238 300 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 201 0.17 12.1 70.0 LDGO V28-238 400 Pacific V28-238 400 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 268 0.19 14.5 76.1 LDGO V28-238 500 Pacific V28-238 500 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 335 0.19 16.1 83.4 LDGO V28-238 600 Pacific V28-238 600 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 402 0.21 16.4 78.8 LDGO V28-238 660 Pacific V28-238 660 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 442 0.27 20.6 77.5 LDGO V28-238 700 Pacific V28-238 700 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 469 0.30 20.3 67.5 LDGO V28-238 800 Pacific V28-238 800 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 536 0.31 20.3 65.0 LDGO V28-238 900 Pacific V28-238 900 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 603 9999 9999 9999 LDGO V28-238 1000 Pacific V28-238 1000 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 670 0.33 20.9 63.1 LDGO V28-238 1100 Pacific V28-238 1100 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 737 0.35 24.3 69.2 LDGO V28-238 1200 Pacific V28-238 1200 1.017 160.48 3120 Foraminifer Globigerinoides sacculifer 804 0.38 24.7 64.7 LDGO V28-238 0 Pacific V28-238 0 1.017 160.48 3120 Foraminifer Globorotalia tumida 1 0.02 1.7 80.0 LDGO V28-238 100 Pacific V28-238 100 1.017 160.48 3120 Foraminifer Globorotalia tumida 67 0.10 7.9 75.9 LDGO V28-238 200 Pacific V28-238 200 1.017 160.48 3120 Foraminifer Globorotalia tumida 134 0.21 14.0 67.6 LDGO V28-238 300 Pacific V28-238 300 1.017 160.48 3120 Foraminifer Globorotalia tumida 201 0.31 15.0 48.2 LDGO V28-238 400 Pacific V28-238 400 1.017 160.48 3120 Foraminifer Globorotalia tumida 268 0.37 20.4 54.6 LDGO V28-238 500 Pacific V28-238 500 1.017 160.48 3120 Foraminifer Globorotalia tumida 335 0.42 23.2 54.7 LDGO V28-238 600 Pacific V28-238 600 1.017 160.48 3120 Foraminifer Globorotalia tumida 402 0.48 20.8 43.0 LDGO V28-238 660 Pacific V28-238 660 1.017 160.48 3120 Foraminifer Globorotalia tumida 442 9999 9999 9999 LDGO V28-238 700 Pacific V28-238 700 1.017 160.48 3120 Foraminifer Globorotalia tumida 469 0.53 24.4 46.2 LDGO V28-238 800 Pacific V28-238 800 1.017 160.48 3120 Foraminifer Globorotalia tumida 536 0.56 28.8 51.4 LDGO V28-238 900 Pacific V28-238 900 1.017 160.48 3120 Foraminifer Globorotalia tumida 603 0.53 24.3 45.5 LDGO V28-238 1000 Pacific V28-238 1000 1.017 160.48 3120 Foraminifer Globorotalia tumida 670 0.56 28.6 50.9 LDGO V28-238 1100 Pacific V28-238 1100 1.017 160.48 3120 Foraminifer Globorotalia tumida 737 0.58 27.9 48.0 LDGO V28-238 1200 Pacific V28-238 1200 1.017 160.48 3120 Foraminifer Globorotalia tumida 804 0.58 31.7 54.7