X-ray Fluorescence (XRF) scans of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
X-ray Fluorescence (XRF) scans of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California
Abstract:
This portion of the data release presents X-ray Flourescence (XRF) data from vibracores collected from Searsville Lake, a reservoir in Jasper Ridge Biological Preserve, Stanford, California in October 2018 (USGS Field Activity 2018-682-FA). The XRF data are provided in comma-delimited files (.csv), one per core.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-682-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    SeanPaul M. La Selle, Stegner, M. Allison, Nasr, Brandon M., Hadly, Elizabeth A., Barnosky, Anthony D., and Sherrod, Brian, 20230131, X-ray Fluorescence (XRF) scans of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California: data release DOI:10.5066/P98CEB1B, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    SeanPaul M. La Selle, Stegner, M. Allison, Nasr, Brandon M., Hadly, Elizabeth A., Barnosky, Anthony D., and Sherrod, Brian, 2023, Computed Tomography (CT) scans, photographs, X-ray Fluorescence (XRF) scans, grain size, and gamma-ray bulk density data of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California: data release DOI:10.5066/P98CEB1B, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.23787
    East_Bounding_Coordinate: -122.23783
    North_Bounding_Coordinate: 37.40684
    South_Bounding_Coordinate: 37.40683
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 29-Oct-2018
    Ending_Date: 29-Oct-2018
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (1798)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00004. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    JRBP2018-VC01A-XRF-Geochem.csv and JRBP2018-VC01B-XRF-Geochem.csv
    Comma Separated Value (CSV) files containing XRF data. The first row is a header row. The ranges listed in the following attributes represent the combined range domains for both files. (Source: Producer Defined)
    Core Depth (cm)
    Depth of XRF measurement below the lakebed (value represents the upper edge of a 1 cm interval). Depths are not corrected for core compaction. (Source: Producer Defined)
    Range of values
    Minimum:159
    Maximum:1141
    Units:cm
    Resolution:1
    Section Number
    Cores were split into approximately 150 cm or shorter sections in order to fit in scanning equipment. The section number denotes which section of core an XRF measurement is collected from, starting from the top of the original, unsectioned core. (Source: Producer Defined)
    Range of values
    Minimum:1
    Maximum:7
    Section Depth (cm)
    The depth within a core section, starting with 0 cm at the top. (Source: Producer Defined)
    Range of values
    Minimum:0
    Maximum:152
    Units:cm
    XRF Total Counts
    The total number of X-ray photons detected by the XRF during a measurement. “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:238594
    Maximum:865658
    XRF Live Time (secs)
    The total time the XRF was detecting photons during a measurement. This is less than the "beam time," set to 20 seconds. “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:8
    Maximum:19
    Units:seconds
    Ti (ppm)
    Titanium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:270.30
    Maximum:3224.82
    Units:parts per million (ppm)
    Ti-Error (+/- ppm)
    Estimated error of Titanium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:56.24
    Maximum:178.89
    V (ppm)
    Vanadium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:312.17
    V-Error (+/- ppm)
    Estimated error of Vanadium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:31.08
    Maximum:259.31
    Cr (ppm)
    Chromium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:111.07
    Cr-Error (+/- ppm)
    Estimated error of Chromium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:14.59
    Maximum:130.39
    Mn (ppm)
    Manganese abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:2930.14
    Mn-Error (+/- ppm)
    Estimated error of Manganese abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:14.30
    Maximum:4023.53
    Fe (ppm)
    Iron abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:4444.14
    Maximum:66101.59
    Fe-Error (+/- ppm)
    Estimated error of Iron abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:93.09
    Maximum:582.99
    Co (ppm)
    Cobalt abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:0.00
    Co-Error (+/- ppm)
    Estimated error of Cobalt abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:72.48
    Maximum:267.35
    Ni (ppm)
    Nickel abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:54.07
    Ni-Error (+/- ppm)
    Estimated error of Nickel abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:4.61
    Maximum:49.97
    Cu (ppm)
    Copper abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:424.50
    Cu-Error (+/- ppm)
    Estimated error of Copper abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:3.36
    Maximum:38.69
    Zn (ppm)
    Zinc abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:35.28
    Maximum:731.17
    Zn-Error (+/- ppm)
    Estimated error of Zinc abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:2.45
    Maximum:16.35
    As (ppm)
    Arsenic abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:38.45
    As-Error (+/- ppm)
    Estimated error of Arsenic abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1.11
    Maximum:29.99
    Se (ppm)
    Selenium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:2.94
    Se-Error (+/- ppm)
    Estimated error of Selenium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.89
    Maximum:16.72
    Rb (ppm)
    Rubidium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:14.93
    Maximum:84.17
    Rb-Error (+/- ppm)
    Estimated error of Rubidium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.95
    Maximum:2.73
    Sr (ppm)
    Strontium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:31.98
    Maximum:171.86
    Sr-Error (+/- ppm)
    Estimated error of Strontium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1.07
    Maximum:3.40
    Y (ppm)
    Yttrium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.0
    Maximum:21.09
    Y-Error (+/- ppm)
    Estimated error of Yttrium abundance in parts per million (ppm) (Source: Producer Defined)
    Range of values
    Minimum:0.94
    Maximum:42.05
    Zr (ppm)
    Zirconium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:13.44
    Maximum:92.21
    Zr-Error (+/- ppm)
    Estimated error of Zirconium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1.18
    Maximum:3.05
    Nb (ppm)
    Niobium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:22.34
    Nb-Error (+/- ppm)
    Estimated error of Niobium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1.87
    Maximum:97.44
    Mo (ppm)
    Molybdenum abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:17.59
    Mo-Error (+/- ppm)
    Estimated error of Molybdenum abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:2.10
    Maximum:97.91
    Ag (ppm)
    Silver abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:44.21
    Ag-Error (+/- ppm)
    Estimated error of Silver abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:6.38
    Maximum:630.80
    Cd (ppm)
    Cadmium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:47.4
    Cd-Error (+/- ppm)
    Estimated error of Cadmium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:7.37
    Maximum:770.18
    Sn (ppm)
    Tin abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:57.50
    Sn-Error (+/- ppm)
    Estimated error of Tin abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:11.51
    Maximum:1271.13
    Sb (ppm)
    Antimony abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.0
    Maximum:71.02
    Sb-Error (+/- ppm)
    Estimated error of Titanium Antimony in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:16.50
    Maximum:1706.71
    W (ppm)
    Tungsten abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:0.00
    W-Error (+/- ppm)
    Estimated error of Tungsten abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:63.78
    Maximum:209.14
    Hg (ppm)
    Mercury abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0
    Maximum:0
    Hg-Error (+/- ppm)
    Estimated error of Mercury abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:48.25
    Maximum:128.95
    Pb (ppm)
    Lead abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:18.99
    Pb-Error (+/- ppm)
    Estimated error of Lead abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1.63
    Maximum:113.98
    Bi (ppm)
    Bismuth abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:13.88
    Bi-Error (+/- ppm)
    Estimated error of BIsmuth abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1.41
    Maximum:111.20
    Th (ppm)
    Thorium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:55.64
    Th-Error (+/- ppm)
    Estimated error of Thorium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:4.99
    Maximum:364.34
    U (ppm)
    Uranium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:25.20
    U-Error (+/- ppm)
    Estimated error of Uranium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:2.38
    Maximum:195.02
    LE (ppm)
    Light Element (LE) abundance in parts per million (ppm). LEs are elements lighter than Magnesium (Mg), and are indistinguishable from each other with the Olympus Delta Professional XRF and are therefore grouped together. “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:729599.5
    Maximum:967859.02
    LE-Error (+/- ppm)
    Estimated error of Light Element (LE) abundance in parts per million (ppm). LEs are elements lighter than Magnesium (Mg), and are indistinguishable from each other with the Olympus Delta Professional XRF and are therefore grouped together. “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:565.43
    Maximum:6666.06
    Mg (ppm)
    Magnesium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:31042.05
    Mg-Error (+/- ppm)
    Estimated error of Magnesium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:3966.75
    Maximum:56040.08
    Al (ppm)
    Aluminum abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:3343.22
    Maximum:49412.21
    Al-Error (+/- ppm)
    Estimated error of Aluminum abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:497.10
    Maximum:1609.55
    Si (ppm)
    Silicon abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:2252.82
    Maximum:154045.10
    Si-Error (+/- ppm)
    Estimated error of Silicon abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:143.02
    Maximum:1317.39
    P (ppm)
    Phosphorus abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:2435.09
    P-Error (+/- ppm)
    Estimated error of Phosphorus abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:36.05
    Maximum:859.44
    S (ppm)
    Sulfur abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:0.00
    Maximum:2580.26
    S-Error (+/- ppm)
    Estimated error of Sulfur abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:23.73
    Maximum:845.37
    K (ppm)
    Potassium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1169.07
    Maximum:12665.38
    K-Error (+/- ppm)
    Estimated error of Potassium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:27.44
    Maximum:129.27
    Ca (ppm)
    Calcium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:1615.19
    Maximum:25567.80
    Ca-Error (+/- ppm)
    Estimated error of Calcium abundance in parts per million (ppm). “No data” values are represented by -999. (Source: Producer Defined)
    Range of values
    Minimum:25.17
    Maximum:163.60

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • SeanPaul M. La Selle
    • M. Allison Stegner
    • Brandon M. Nasr
    • Elizabeth A. Hadly
    • Anthony D. Barnosky
    • Brian Sherrod
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    PCMSC Science Data Coordinator
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    831-427-474 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Data were obtained to characterize downcore geochemical properties of sediments. These data are intended for science researchers, students, policy makers, and the general public.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 06-Oct-2020 (process 1 of 2)
    Cores were collected on October 29, 2018. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. Cores were segmented into 150 cm (or shorter) sections in the field and split into "working" and "archive" halves in the lab. Sediment surfaces were cleaned and smoothed on the "archive" halves of split cores. A four micron-thick ultralene film that is transparent to x-rays was applied to the sediment surface in order to protect the XRF window. Cores were loaded onto the track of a Geotek Multi Sensor Core Logger (MSCL) with an Olympus Delta Professional XRF gun mounted to an arm that moves the XRF sensor vertically on and off the core surface. The XRF sensor was calibrated before each scan using a 316-alloy reference coin. The XRF window is 1x1 cm square and measurements were collected every 1 cm downcore, automated by the motors on the MSCL. The XRF was run in "geochem" mode with two beams at 20 seconds each (with a 16-19 second XRF-live time). Data were processed with Geotek MSCL software and elemental abundances are reported in parts per million(ppm). Geochem mode processes the data as a closed sum compositional dataset, assuming that all components add up to 100%. Elements lighter than Mg are grouped into the "Light Elements" (LE) category in order to maintain a closed compositional dataset. Geochem XRF data from each core segment were merged into two datasets, one for each of the two vibracores. XRF data are provided in two comma-delimited files (.csv) corresponding to each of the two vibracores. Person who carried out this activity:
    SeanPaul La Selle
    U.S. Geological Survey, Pacific Coastal and Marine Science CEnter
    Geologist
    2885 Mission St.
    Santa Cruz, CA

    831-460-7574 (voice)
    slaselle@usgs.gov
    Date: 23-Feb-2023 (process 2 of 2)
    corrected typo in doi number (scochran@usgs.gov)
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted
  2. How accurate are the geographic locations?
    The locations of samples were determined using a Garmin etrex 30x handheld global satellite navigation system (GNSS) receiver capable of receiving wide area augmentation system (WAAS) signals. The manufacturer reported accuracy for horizontal positions is 3-5 m while receiving WAAS signals.
  3. How accurate are the heights or depths?
    Core location depths and water depths were not associated with a fixed vertical datum at the time of core collection. No formal positional accuracy tests were conducted, nor were they applicable for this dataset.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints None. Please see 'Distribution Info' for details.
Use_Constraints None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.
  1. Who distributes the data set? (Distributor 1 of 1)
    GS ScienceBase
    U.S. Geological Survey
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? XRF data are available in comma-delimited text file format (JRBP2018-VC01A-XRF-Geochem.csv and JRBP2018-VC01B-XRF-Geochem.csv), including FGDC-compliant metadata.
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 23-Feb-2023
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P98CEB1B/JRBP2018-XRF-geochem-metadata.faq.html>
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