Work Description

Dataset title: Scanning X-ray fluorescence (XRF) for MV0811-14JC

Dataset contact: Ingrid L. Hendy

Data citation: Hendy, I.L., Wang, Y. (2019). Scanning X-ray fluorescence (XRF) for MV0811-14JC [Data set]. University of Michigan Deep Blue Data Repository. https://doi.org/10.7302/2r77-yv35

Latitude: 34.2818°N
Longitude: 120.0360°W
Water depth: 582 m
Core retrieval Date:2008.11
Core type: Jumbo Piston core
Research Vessel: R/V Melville

Overview: This dataset includes scanning X-ray fluorescence (XRF) data for MV0811-14JC.

Methods: MV0811-14JC contains 10 sections. The first 8 sections were scanned at 200-µm resolution on an ITRAX X-ray fluorescence (XRF) core scanner (Cox Analytical Instruments) at the Large Lakes Observatory, University of Minnesota, Duluth. The scanner is equipped with a Cr X-ray tube, and operated with an 8-second scan time at 30 kV and 15 mA. Section 1-3 were scanned in 2010 and XRF spectra were re-evaluated in 2012 using the updated peak fitting algorithm to include more elements, and Section 4-8 were scanned in 2014, with more elements evaluated (see variables).

Files contained:
'MV0811-14JC_Sec 1_0 to 22 cm.csv': Section 1, 0-22 cm
'MV0811-14JC_Sec 1_22 to 85.4 cm.csv': Section 1, 22-85.4 cm
'MV0811-14JC_Sec 2.csv': Section 2, 0-142.8 cm
'MV0811-14JC_Sec 3.csv': Section 3, 0-147.5 cm
'MV0811-14JC_Sec 4.csv': Section 4, 3.5-137.5 cm
'MV0811-14JC_Sec 5.csv': Section 5, 0-16.3 cm
'MV0811-14JC_Sec 6.csv': Section 6, 2-149.2 cm
'MV0811-14JC_Sec 7.csv': Section 7, 1-151 cm
'MV0811-14JC_Sec 8.csv': Section 8, 1.5-150.5 cm

Each file contains some or all of the variables listed below.

Variables:

Position(mm): Scanning XRF sample depth;
sample surface: Height above the D-shaped core bottom;
validity: 1 if pass the quality check;
E-gain, E-offset, F-slope, F-offset: Adjustments to energy-channel relationship during spectral analysis of raw XRF spectra;
kcps (kilo counts per second): Total photon counts per second;
MSE: Mean square error in the peak fitting;
Al: Aluminum peak area;
Si: Silicon peak area;
P: Phosphorus peak area;
S: Sulfur peak area;
Cl: Chlorine peak area;
Ar: Argon peak area;
K: Potassium peak area;
Ca: Calcium peak area;
Sc: Scandium peak area;
Ti: Titanium peak area;
V: Vanadium peak area;
Mn: Manganese peak area;
Fe: Iron peak area;
Co: Cobalt peak area;
Ni: Nickel peak area;
Cu: Copper peak area;
Zn: Zinc peak area;
Ga: Gallium peak area;
Ge: Germanium peak area;
As: Arsenic peak area;
Se: Selenium peak area;
Br: Bromine peak area;
Rb: Rubidium peak area;
Sr: Strontium peak area;
Y: Yttrium peak area;
Zr: Zirconium peak area;
Mo: Molybdenum peak area;
Ba: Barium peak area;
Pr: Praseodymium peak area;
Eu: Europium peak area;
Ta: Tantulum peak area;
W: Tungsten peak area;
Bi: Bismuth peak area;
Po: Polonium peak area;
CaA+CaA: Sum peaks generated by the combination of Ca Kα and Ca Kα energy;
CaA+CrA: Sum peaks generated by the combination of Ca Kα and Cr Kα energy;
1, 2, 3: Peak fitting algorithm output;
inc: Cr (Chromium X-ray tube) incoherent scattering;
coh: Cr (Chromium X-ray tube) coherent scattering;

For Section 4-8, additional variables measured are listed below.

Mg: Magnesium peak area;
Pd: Palladium peak area;
Cd: Cadmium peak area;
Sn: Tin peak area;
Sb: Antimony peak area;
Te: Tellurium peak area;
La: Lanthanum peak area;
Pm: Promethium peak area;
Tm: Thulium peak area;
Hg: Mercury peak area;
Pb: Lead peak area;