Paleocene Thermal Maximum Data, Bass River, NJ: Readme file ----------------------------------------------------------------------- World Data Center A- Paleoclimatology ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THESE DATA!!!!! NAME OF DATA SET: Paleocene Thermal Maximum Data, Bass River, NJ LAST UPDATE: 2/99 (Original Receipt by WDCA Paleo) CONTRIBUTOR: Benjamin Cramer, Rutgers University. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 1999-007 SUGGESTED DATA CITATION: Cramer, B.S., 1999, Paleocene Thermal Maximum Data, Bass River, NJ, IGBP PAGES/World Data Center-A for Paleoclimatology Data Contribution Series # 1999-007. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCES: Cramer, B.S., Aubry, M.-P., Miller, K.G., Olsson, R.K., Wright, J.D., Kent, D.V., 1999: An exceptional chronologic, isotopic, and clay mineralogic record of the late Paleocene thermal maximum, Bass River, NJ, ODP 174AX. Bulletin de la Societe Geologique de France, in press. (Abstract below) Cramer, B.S.: The late Paleocene Thermal Maximum, Bass River, NJ: Neritic response to a runaway greenhouse event (Masters Thesis). Rutgers University, New Brunswick, NJ, 132 p., 1998. FUNDING SOURCES: New Jersey Geological Survey (USA), National Science Foundation (Earth Sciences Division, Continental Dynamics Program, and Ocean Science Division, Ocean Drilling Program) (USA) National Science Foundation Graduate Research Fellowship (USA) GEOGRAPHIC REGION: NE USA PERIOD OF RECORD: latest Paleocene (55-56 Ma). LIST OF FILES: Readme.cramer1999.txt (this file), BRAFDEMG.TXT, BRMAGNET.TXT, BRCLAY.TXT, BRISOTOP.TXT, BRSAND.TXT. DESCRIPTION: Bass River, NJ, USA core latest Paleocene paleomagnetic, clay mineralogic, and stable isotopic data. ODP 174AX: Latitude: 39¡36' 42" N Longitude: 74¡26' 12" W Elevation 28 ft (8.53 m) Description of files: BRAFDEMG.TXT Natural remanent magnetism (NRM) was measured on a 2G DC SQUID 3-axis cryogenic magnetometer at Lamont-Doherty Earth Observatory. Step demagnetization of NRM at 5 mT increments to 45 mT was performed using a large-volume alternating field (AF) demagnetization coil. Tab-delimitted text headings are: ID - Sample ID (Depth in feet) TREAT - AF demagnetization treatment for measurement (units are mT) J - Magnetization intensity of sample for measurement DECL - Measured declination INCL - Measured inclination BRMAGNET.TXT The most stable paleomagnetic direction was calculated from linear demagnetization trends using the method of least-squares analysis (Kirschvink, 1980). Tab-delimitted text headings are: Depth_ft - depth below surface in feet (original logging units) Depth_m - depth below surface in meters (calculated by multiplying feet by 0.3048) MAD - maximum angular deviation (some samples do not have a MAD entry because DECL - measured declination INCL - measured inclination TREATS - AF demagnetization treatments used in analysis (units are mT) Jcomp - magnitude of best-fit vector BRCLAY.TXT Smear slides of the <2 µm size fraction were analyzed dry and after glycol solvation at the New Jersey Geological Survey on a Diano 2100e X-ray diffractometer (XRD) using a Cu target. Counts per second (CPS) were measured at 0.04 ¡2Q increments from 5 - 33 ¡2Q. Quantitative analysis was performed on the glycol saturated traces using procedures described in Moore and Reynolds (1989). Tab-delimitted text headings are: depth_ft - depth below surface in feet (original logging units) depth_m - depth below surface in meters (calculated by multiplying feet by 0.3048) kaolinite - percent kaolinite in the clay assemblage illite-smectite - percent mixed-layer illite/smectite in the clay assemblage BRISOTOP.TXT Isotope analysis was performed at the University of Maine, Orono. The samples were reacted in phosphoric acid (H3PO4) at 90¡C in an Autocarb peripheral attached to a Micromass Prism II mass spectrometer. The analytical precision of the NBS19 and NBS20 standards analyzed during the sample runs was 0.06 per mil and 0.05 per mil for del18O and del13C values, respectively. All values are reported in del notation with units of per mil. Tab-delimitted text headings are: depth_ft - depth below surface in feet (original logging units) depth_m - depth below surface in meters (calculated by multiplying feet by 0.3048) Cib_del13C - del13C measurement on Cibicidoides spp. (mostly C. succedens, C. alleni and C. cf. vulgaris) Cib_del18O - del18O measurement on Cibicidoides spp. (mostly C. succedens, C. alleni and C. cf. vulgaris) Anom_del13C - del13C measurement on Anomalinoides acuta Anom_del18O - del18O measurement on Anomalinoides acuta Sten_del13C - del13C measurement on Stensioina beccariiformis Sten_del18O - del18O measurement on Stensioina beccariiformis Gyro_del13C - del13C measurement on Gyroidinoides octocamerata Gyro_del18O - del18O measurement on Gyroidinoides octocamerata BRSAND.TXT The percentage of sand in the sediment was calculated based on the weight of samples before and after washing through a 63 µ seive. Relative proportions of components of the sand fraction were determined by visual examination under a light microscope. Components of the sand fraction are reported as estimated percentages normalized to the percentage by weight of total sand. Tab-delimitted text headings are: depth_ft - depth below surface in feet (original logging units) depth_m - depth below surface in meters (calculated by multiplying feet by 0.3048) clay - percent clay, measured by weight glauc - percent glauconite sand quartz - percent quartz sand forams - percent forams sand mica - percent mica sand other - percent other sand grains Abstract: A thick, apparently continuous section recording events of the latest Paleocene thermal maximum in a neritic setting was drilled at Bass River State Forest, New Jersey as part of ODP Leg 174AX (Miller, Sugarman, Browning, et al., 1998). Integrated nannofossil and magneto-stratigraphy provides a firm chronology supplemented by planktonic foraminiferal biostratigraphy. These chronologic studies indicate that this neritic section rivals the best deep-sea sections in providing a complete record of late Paleocene climatic events. Carbon and oxygen isotopes measured on benthic foraminifera show a major (4.0ä in carbon, 2.3ä in oxygen) negative shift correlative with the global latest Paleocene carbon isotope excursion (CIE). A sharp increase in kaolinite content coincides with the isotope shift in the Bass River section, analogous to increases found in several other records. Carbon and oxygen isotopes remain low and kaolinite content remains high for at least 300-500 k.y. after the CIE. We interpret these data as indicative of an abrupt shift to a warmer and wetter climate along the North American mid-Atlantic coast, in concert with global events associated with the CIE.