|Description||Sediment magnetic, paleomagnetic and geochemical results have been obtained from lacustrine sediments recovered in a 30-meter core taken by rotary drilling methods at Grass Lake, Siskiyou County, California. The data have been analyzed and interpreted in|
|Originators||Best, Patti J.; Reynolds, Richard L.; Rosenbaum, Joseph G.; Drexler, John; and Adam, David. P.|
|Publication||U.S. Geological Survey Open-File Report 96-294|
Grass Lake Sample Number: A unique number assigned to a sample regardless ot sample type Sample box no.: A unique sample number assigned to samples put into plastic cubes for magnetic mineral studies. The volume of each cube is 3.2 cubic centimeters. Vial no.: A unique sample number assigned to sediment sample put into vials. Drive no.: Identifies location in the core. The core was divided into drives numbered sequentially starting with 1 at the top. Some drives have been further divided into slugs indicated by letters, starting with A at the top of the drive. Drive depth: The depth in meters of the top of the drive from the Depth interval of sample: The depth range of the sample within the drive. Sample depth within drive (cm): Midpoint of the depth interval in centimeters. Sample depth within drive (m): Midpoint of depth interval in meters. Sample depth in core (m): Sample depth within drive (m) plus depth of drive from top of core. Sample density (kg/m3): Density of sample calculated from the mass of the dried box samples used in magnetic mineral studies. Declination: Declination of the characteristic magnetization, clockwise from geographic north. Inclination The inclination of the characteristic magnetization. NRM: Natural Remanent Magnetization in Am2/kg. Demag. Interval: The demagnetization interval over which both Declination and Inclination were calculated. Number of Points used in linear fit: Number of points used to create best fit line. Subjective quality: A subjective grade (a is best, c the worst) given to the orthogonal vector diagrams from which the best fit line was calculated. MSLF: Low-frequency magnetic susceptibility in m3/kg. FDMS: Frequency-dependent magnetic susceptibility in percent. ARM: Anhysteretic remanent magnetization in Am2/kg. IRM (1.2T): Isothermal remanent magnetization from induction in a 1.2 tesla field at room temperature. Expressed in Am2/kg. IRM (-.3T): Isothermal remanent magnetization from induction in a -0.3 tesla field at room temperature. Expressed in Am2/kg. HIRM: Hard isothermal remanent magnetization: HIRM is calculated as: [IRM(1.2T)+IRM(-0.3T)]/2 and expressed in Am2/kg. S: (S Ratio) calculated as IRM(-0.3T)/IRM(1.2T). Element concentration, Cr: Chromium-ppm Element concentration, Cr: Copper-ppm Element concentration, Fe: Iron- Wt% Element concentration, Mn: Manganese-ppm Element concentration, Mo: Molybdenum-ppm Element concentration, Nb: Niobium-ppm Element concentration, Ni: Nickel-ppm Element concentration, Rb: Rubidium-ppm Element concentration, Sr: Strontium-ppm Element concentration, Ti: Titanium-Wt % Element concentration, V: Vanadium-ppm Element concentration, Y: Yttrium-ppm Element concentration, Zn: Zinc-ppm Element concentration, Zr: Zirconium-ppm Total Carbon: Percent of carbon (both organic and inorganic) in sample. Carbonate Carbon: Percent of inorganic carbon in sample. Organic Carbon: Percent of organic carbon in sample. Calculated as total carbon minus carbonate carbon.
U.S. Geological Survey Open-File Report 96-294