X-ray diffraction data for the 0-2 cm horizons of marine sediment cores and a mineral concretion near waste barrels in the San Pedro Basin of the Southern California Borderland

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Kira Mizell
Originator: Isabelle M. Shapiro
Publication_Date: 20250618
Title:

X-ray diffraction data for the 0-2 cm horizons of marine sediment cores and a mineral concretion near waste barrels in the San Pedro Basin of the Southern California Borderland

Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:

Series_Name: data release
Issue_Identification: DOI: 10.5066/P1PZ48WA

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation: Mizell, K. and Shapiro, I.M., 2025, X-ray diffraction data for the 0-2 cm horizons of marine sediment cores and a mineral concretion near waste barrels in the San Pedro Basin of the Southern California Borderland: U.S. Geological Survey data release, https://doi.org/10.5066/P1PZ48WA.

Online_Linkage: https://doi.org/10.5066/P1PZ48WA

Description:

Abstract:

Marine sediment push cores and one mineral concretion were collected near waste barrels in the San Pedro Basin of the Southern California Borderland in the Pacific Ocean using a remotely operated vehicle during the Schmidt Ocean Institute research cruise FK210726 onboard the R/V Falkor in 2021. Dried sediment samples of the 0-2 centimeter horizon of the cores and the mineral concretion were prepared at the USGS Pacific Coastal and Marine Science Center for powder x-ray diffraction analyses, and x-ray diffraction scan data are provided here. Location information (latitude, longitude, depth) for each sample are provided in each Attribute Definition of this metadata file. The x-ray diffraction work was funded by the U.S Geological Survey Pacific Coastal and Marine Science Center and ship time was funded by NOAA Office of Ocean Exploration and Research (grant number NA19OAR110305).

Purpose:

These data serve to expand the knowledge of seafloor sediments offshore Southern California in regions where waste dumping has occurred.

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=2021-637-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20210726
Ending_Date: 20250215

Currentness_Reference: ground condition at the time data were collected

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.112342
East_Bounding_Coordinate: -117.200932
North_Bounding_Coordinate: 33.761558
South_Bounding_Coordinate: 32.248276

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Nonliving Resources
Theme_Keyword: Physical/Chemical Features

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: X-ray diffraction
Theme_Keyword: marine geology
Theme_Keyword: chemical analysis

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: basin
Theme_Keyword: mineralogy
Theme_Keyword: marine geology
Theme_Keyword: sedimentology
Theme_Keyword: coastal pollution
Theme_Keyword: dump site
Theme_Keyword: sedimentary waste disposal

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Theme_Keyword: Global Ocean Mineral Resources

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:6838f0c7d4be0259257472b1

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Pacific Ocean

Place:

Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Southern California Borderland
Place_Keyword: San Pedro Basin

Access_Constraints: No access constraints
Use_Constraints:

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.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Native_Data_Set_Environment: Mac OS Ventura 13.7.4, Microsoft Excel 16.95.4 for Mac

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

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.

Logical_Consistency_Report: No formal logical accuracy tests were conducted.
Completeness_Report:

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.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

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.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

A formal accuracy assessment of the vertical positional information in the dataset has not been conducted.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Levin, Lisa
Publication_Date: 2021
Title:

Event Logs from ROV SuBastian Dives conducted during R/V Falkor expedition FK210726 (2021)

Online_Linkage: https://www.marine-geo.org/tools/files/30410#datasets

Type_of_Source_Media: Marine Geoscience Data System
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20210726
Ending_Date: 20210805

Source_Currentness_Reference: ground condition at time samples were collected

Source_Citation_Abbreviation: FK210726 cruise data
Source_Contribution: Latitude, longitude, and depth information for FK210726 samples

Process_Step:

Process_Description:

Push core samples and one mineral concretion sample were collected near waste barrels in San Pedro Basin of the Southern California Borderland in the Pacific Ocean onboard the R/V Falkor between July 26, 2021, and August 5, 2021, during the FK210726 research expedition. Push cores and the mineral concretion were recovered by the manipulator arm of ROV SubBastian.

Process_Date: 20210805

Process_Step:

Process_Description:

On board ship, sediment cores were extruded and sliced into four 2 cm depth horizons. Aliquots of the 0-2 cm horizon were homogenized with alcohol-sterilized spatula and frozen at -20 degrees Celcius in Whirlpakÿbag.

Process_Date: 20210805

Process_Step:

Process_Description:

On board ship, the mineral concretion was recovered from the ROV and stored in a plastic bag at room temperature.

Process_Date: 20210805

Process_Step:

Process_Description:

At Scripps Institution of Oceanography, approximately 2 grams of the frozen 0-2 cm horizon sediment aliquots were thawed in a sterile petri dish and air-dried overnight in a sterile flow hood. The sediment was then homogenized with mortar and pestle and shipped to the USGS Pacific Coastal and Marine Science Center at ambient temperature.

Process_Date: 20240615
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Johanna Gutleben
Contact_Organization:

Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego

Contact_Position: postdoctoral researcher
Contact_Address:

Address_Type: mailing
Address: Kaplan Lab, Room 201, 9500 Gilman Drive, Mail Code 0209
City: San Diego
State_or_Province: CA
Postal_Code: 92093-0209

Contact_Voice_Telephone: 858-534-7322
Contact_Electronic_Mail_Address: jgutleben@ucsd.edu

Process_Step:

Process_Description:

At the USGS Marine Minerals Lab, the mineral concretion was rinsed with deionized water, air-dried overnight in a flow hood in a watch glass, and ground with a mortar and pestle to approximately 75 micrometer fineness.

Process_Date: 20211010

Process_Step:

Process_Description:

At the USGS Pacific Coastal and Marine Science Center Marine Minerals Lab powdered sediment and mineral concretion samples were backloaded and tamped into sample holders and run in a Panalytical X Pert3 x-ray diffractometer (XRD; https://www.malvernpanalytical.com/) with Cu K-alpha radiation and graphite monochromator. XRD scans were collected using the following parameters: step size of 0.017 degrees two-theta between 5 and 70 degrees two-theta, power of 40 kilovolt and 45 milliampere, 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).

Process_Date: 20250319

Process_Step:

Process_Description:

X-ray diffraction scan data were combined into a comma-delimited text values document (FK210726_SCB_barrel_sediment_XRD_data.csv).

Source_Used_Citation_Abbreviation: FK210726 cruise data
Process_Date: 20250306

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 3823

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.00000001
Longitude_Resolution: 0.0000001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222356

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: FK210726_SCB_barrel_sediment_XRD_data.csv
Entity_Type_Definition:

Comma-delimited file containing results from x-ray diffraction analyses of the 0-2 cm horizon of marine sediment core samples and one mineral concretion. 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. The sediment sample names follow the scheme of SCB, indicating Southern California Borderland, followed by a hyphen, followed by the push core ID and sediment horizon ID, which is represented by a combination of numbers and letters. The mineral concretion sample is simply labeled as such.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Position_2theta
Attribute_Definition:

The two-theta angle at which the x-ray diffractometer measured the X-ray diffraction of the powdered sample

Attribute_Definition_Source: instrument defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 5.0084
Range_Domain_Maximum: 69.9824
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: SCB-274bA
Attribute_Definition:

X-ray diffraction intensity value at the two-theta angle listed in the corresponding row in the Position attribute. The location for sample SCB-274bA is 33.57358835, -118.4360591 and 900.61 m water depth.