Kira Mizell
20230125
X-ray diffraction data for heat treated samples of hydrothermal minerals from seamounts within the Tuvalu Exclusive Economic Zone
comma-delimited text
data release
DOI: 10.5066/P95CIHSU
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P95CIHSU
Kira Mizell
2023
Major and trace element geochemistry and mineralogy of ferromanganese crusts from seamounts within the Tuvalu Exclusive Economic Zone
data release
DOI:10.5066/P95CIHSU
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P95CIHSU
A sample of hydrothermally mineralized foraminifera ooze (D28A) was collected via dredge from a seamount within the Tuvalu Exclusive Economic Zone in the Pacific Ocean during cruise RR1310 funded by the National Science Foundation aboard the R/V Roger Revelle in 2013. USGS scientists requested these ferromanganese crust samples from the Oregon State University Marine and Geology Repository where they had been archived. Ferromanganese crust samples were sent to USGS for subsampling and x-ray diffraction analyses. Powder x-ray diffraction data for three layer-fractions of the hydrothermal sample are provided here. Measurements were made after heating to 115 C for 48 hours to test the stability of the phyllomanganate mineral phase. Location information for the sample is included in each Attribute Definition of this metadata file, as well as in the geochemical data table (Tuvalu_RR1310_FeMn_geochem_data.csv) of this multi-table data release.
These data serve to expand the knowledge and statistics for deep ocean marine mineral occurrences and composition within the global ocean.
Samples analyzed for this data release were collected on a cruise funded by National Science Foundation grant #1154070. All metadata associated withcruise RR1310 is available upon request from the Oregon State University Marine and Geology Repository (http://osu-mgr.org).
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
20130722
20220906
Date that the last process step was completed
None planned
179.869
179.871
-11.331
-11.329
ISO 19115 Topic Category
oceans
geoscientificInformation
Data Categories for Marine Planning
Nonliving Resources
Material Resources
Mineral Resources
Physical/Chemical Features
Assessments
USGS Thesaurus
dredge sampling
X-ray diffraction
metallic mineral resources
marine geology
Marine Realms Information Bank (MRIB) keywords
sediment geochemistry
mineral resources
chemical analysis
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Pacific Coastal and Marine Science Center
PCMSC
Global Ocean Mineral Resources
mineralogical analysis
USGS Metadata Identifier
USGS:63b65086d34e92aad3cacaf0
Geographic Names Information System (GNIS)
Pacific Ocean
NGA GEOnet Names Server (GNS)
Tuvalu
None
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Mac OSX 11.6.1, Microsoft Excel 16.47.1 for Mac
X-ray diffraction data were tested for accuracy by intermittently analyzing a powdered quartz reference sample to verify the one hundred intensity peak at 26.6 degree two-theta. When the quartz peak was in the proper position, we infer that other measured peak positions in the sample are accurate. Peak intensities are considered semiquantitative since no quantitative standards were analyzed for this dataset.
No formal logical accuracy tests were conducted.
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.
A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted. The horizontal accuracy was determined with the ship's GPS navigation, which is accurate to less than 5 m.
The singular value for water depth for each sample was calculated from shipboard dredge log records to account for ship-based depth soundings, the length of dredge wire out, movement by the ship, approximate seamount slope, and multiple bites of the dredge along each dredge track in order to maximize location accuracy. A formal accuracy assessment of the vertical positional information in the dataset has not been conducted.
USGS scientists requested these ferromanganese crust samples from the Oregon State University Marine and Geology Repository where they had been archived. Ferromanganese crust samples were sent to USGS for subsampling and mineralogical analyses.
20160926
At USGS, individual layers were sampled from the hydrothermal sample using a ceramic knife and then ground using an agate mortar and pestle to approximately 75 micrometers. Samples were then placed in crucibles and heated in an oven to 115 C for 48 hours.
20170501
After cooling from the previous heat step, powdered samples were backloaded and tamped into sample holders and run in a Panalytical XĂ•Pert3 x-ray diffractometer (XRD; https://www.malvernpanalytical.com/) with CuK-alpha radiation and graphite monochromator. Measurements were taken with the following scan parameters: step size of 0.017 degrees two-theta between 5 degrees and 70 degrees two-theta, power of 40 kilovolts and 45 milliamps, scan rate of 60 seconds per step, a sample holder rotational speed of 0.03 degrees per second, and averaged triplicate scans at three different stage wobble angles (-1, 0, and 1 degree).
samples
20181101
Results from the diffraction analyses were combined into a comma-delimited text values document (Tuvalu_RR1310_FeMn_115C XRD_RawData.csv).
results
20220905
Point
Point
3823
0.001
0.001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.0
298.257222101
Tuvalu_RR1310_FeMn_115C XRD_RawData.csv
Comma-delimited file containing results from x-ray diffraction analyses of ferromanganese crusts. Location information for the samples are included in each Attribute Definition of this metadata file and not the data table. The header for each column of diffraction data is a sample name, which follows the scheme of dredge number followed by a hyphenated sample number, then an L followed by a number and a stratigraphic location (lower, middle, upper) to explain specific layers that were analyzed.
Producer defined
Position
The two-theta angle at which the x-ray diffractometer measured the X-ray diffraction of the powdered sample
instrument defined
5.0084
69.9824
degrees
0.0001
D28A-01_L1_LOWER
X-ray diffraction intensity value at the two-theta angle listed in the corresponding row in the Position attribute. The location for sample D28A-01_L1_LOWER is -11.330 N, 179.870 E, and 2842 m water depth
producer defined
13.0000
682.9668
counts
0.0001
D28A-01_L2_MIDDLE
X-ray diffraction intensity value at the two-theta angle listed in the corresponding row in the Position attribute. The location for sample D28A-01_L2_MIDDLE is -11.330 N, 179.870 E, and 2842 m water depth
producer defined
9.1451
1268.3867
counts
0.0001
D28A-01_L3_UPPER
X-ray diffraction intensity value at the two-theta angle listed in the corresponding row in the Position attribute. The location for sample D28A-01_L3_UPPER is -11.330 N, 179.870 E, and 2842 m water depth
producer defined
13.8953
364.3586
counts
0.0001
The first line of the csv file is a header line.
U.S. Geological Survey
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
These data are available in .csv format contained in a single file.
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 on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
comma-delimited text
Microsoft Excel 16.16.17 for Mac
File contains table in .csv format
No compression applied
0.12485
https://www.sciencebase.gov/catalog/file/get/63b65086d34e92aad3cacaf0
https://www.sciencebase.gov/catalog/item/63b65086d34e92aad3cacaf0
https://doi.org/10.5066/P95CIHSU
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download a zipped file of data and metadata. The second link points to a landing page with metadata and data. The third link points to the landing page for the entire data release.
None.
These data can be viewed with Microsoft Excel or any text reader.
20230125
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998