Computed tomography (CT) scans of push cores from Loki's Castle and Favne vent fields, Mohns Ridge

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Amy Gartman
Publication_Date: 20240110
Title:
Computed tomography (CT) scans of push cores from Loki's Castle and Favne vent fields, Mohns Ridge
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P96D02FG
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P96D02FG
Online_Linkage:
https://www.sciencebase.gov/catalog/item/64640adbd34ec179a83d30e6
Larger_Work_Citation:
Citation_Information:
Originator: Amy Gartman
Originator: Manda V. Au
Originator: Denise Payan
Publication_Date: 2023
Title:
Computed tomography (CT) scans, photographs, X-ray fluorescence (XRF) scans, geochemistry, X-ray diffraction (XRD), and gamma-ray bulk density data of push cores from Loki's Castle and Fauna vent fields, Mohns Ridge
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P96D02FG
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Other_Citation_Details:
Suggested Citation: Gartman, A., Au, M.V., and Payan, D., 2024, Computed tomography (CT) scans, photographs, X-ray fluorescence (XRF) scans, geochemistry, X-ray diffraction (XRD), and gamma-ray bulk density data of push cores from Loki's Castle and Favne vent fields, Mohns Ridge: U.S. Geological Survey data release, https://doi.org/10.5066/P96D02FG.
Online_Linkage: https://doi.org/10.5066/P96D02FG
Description:
Abstract:
This portion of the data release presents computed tomography (CT) images from push cores collected from Loki's Castle and Favne vent fields, on the Mohns Ridge, in the Norwegian Sea. These data were collected in 2018 and 2019 (USGS Field Activity 2018-691-DD and 2019-624-FA). A Geotek Rotating X-Ray CT (RXCT) system was used to acquire x-ray images and perform CT reconstructions of unsplit core segments. The full three-dimensional data set consists of individual axial slices which are reconstructed images in TIFF format. These axial slices are oriented perpendicular to the long axis of the core. Two-dimensional orthogonal views are also provided that illustrate representative downcore slabs of each core. Geotek software-proprietary XML files are provided in each folder containing axial slices and orthogonal views, containing more image-scaling and information on x-ray system settings and reconstruction parameters.
Purpose:
Images were obtained to characterize sediment in push cores. These data are intended for science researchers, students, policy makers, and the general public.
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=2018-691-DD https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-624-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: 20180718
Ending_Date: 20190630
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 3.8318
East_Bounding_Coordinate: 8.1661
North_Bounding_Coordinate: 73.5678
South_Bounding_Coordinate: 72.7556
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: push coring
Theme_Keyword: marine geology
Theme_Keyword: core analysis
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Nonliving Resources
Theme_Keyword: Mineral Resources
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:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:64640adbd34ec179a83d30e6
Place:
Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Norwegian Sea
Place_Keyword: Greenland Sea
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Loki's Castle vent field
Place_Keyword: Favne vent field
Access_Constraints: None. Please see 'Distribution Info' for details.
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(s) of the dataset and in products derived from these data. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: PCMSC Science Data Coordinator
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
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
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted
Logical_Consistency_Report:
The core depths listed in the Geotek software’s proprietary metadata files are not corrected for sediment compaction and are relative to the surface of the sediment.
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:
The locations of samples were determined using the ROV's Ultra Short Baseline Positioning (USBL) navigation. Accuracy for this depth is approximately 20-50 m.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The vertical accuracy was determined with the ROV's altimeter, which is accurate to less than 1 m. No formal positional accuracy tests were conducted.
Lineage:
Process_Step:
Process_Description:
Samples are push cores and were pushed into sediment by the ROV’s manipulator arm. Once recovered, shipboard cores were frozen (2018-691-DD) or refrigerated (2019-624-FA) until return to shore. Samples were donated from Field Activity 2018-691-DD, and no USGS attendees were present. Amy Gartman attended 2019-624-FA.
Process_Date: 20190704
Process_Step:
Process_Description:
CT scans were acquired at the USGS Pacific Coastal and Marine Science Center core facility using a Geotek Rotating X-Ray CT (RXCT) Scanner system, running acquisition software version XCT4. Rotational x-ray images were acquired with a Thermo Kevex PSX10-65W x-ray source every 0.2 degrees at 115 kilovolts (kV) and 450 microamperes. Each core segment was scanned individually. Rotational images were reconstructed into axial slice TIFFs using Geotek’s Reconstructor Software. Once reconstructed, the axial slice TIFFs were imported into GeoTek's Image Viewer software and representative two-dimensional orthogonal views were selected. A ruler was added to the orthogonal TIFF images using the GeoTek Add Ruler software, which exported the final TIFF and software-proprietary XML files, appending 'R' to the file name. Axial slice TIFF images are organized into a subfolder folder named ‘SliceViews’, and orthogonal TIFF images are in the subfolder ‘OrthogonalViews’. These folders are compressed into single zip files with filenames corresponding to each core scanned.
Process_Date: 20230517
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Amy Gartman
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Position: Research Oceanographer
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission St.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-460-7562
Contact_Electronic_Mail_Address: agartman@usgs.gov
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: 16
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00004
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: Decimal Degrees
Geodetic_Model:
Horizontal_Datum_Name: WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: zip files containing CT images
Entity_Type_Definition:
Each zip file contains 2 sub-folders named 'SliceViews' and 'OrthogonalViews'. The 'SliceViews' folder contains TIFF files of each axial slice and two Geotek software-proprietary metadata files, 'index.xml' and 'WholeCoreRecon.txt'. The 'index.xml' file is generated during reconstruction and contains detailed acquisition and reconstruction metadata. The 'WholeCoreRecon.txt' file summarizes x-ray settings, the source and detector geometry, and core depth information. In the 'OrthogonalViews' folder, 4 TIFF files and their respective Geotek software-proprietary metadata .xml files are included. The 'Orthogonal000' and 'Orthogonal090' components of the TIFF filenames signify two-dimensional downcore views of slabs that are orthogonal to each other. Axial slices TIFFs and orthogonal view TIFFs are 16-bit images with a pixel size of 96 microns, or 104 pixels per centimeter.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: axial slice metadata file 'index.xml'
Attribute_Definition:
This Geotek software-proprietary XML file contains information on CT scan acquisition settings and reconstruction settings. The following attributes and example attribute values are provided: <geotek-ct-recon> <geoct-Identification-Section> <Core-ID>GS18ROV26PC01</Core-ID> <Image-Type>CT-Volume</Image-Type> <Processing-Stage>Acquired</Processing-Stage> <Section-Number>1</Section-Number> <Section-Depth units="cm">0</Section-Depth> <Total-Scanned-Length units="cm">48.19</Total-Scanned-Length> <User-Comments></User-Comments> <Firmware-Version></Firmware-Version> <Windows-Version></Windows-Version> <Logger-Type-Desc></Logger-Type-Desc> <Generated-From-Application></Generated-From-Application> <SVN-Version></SVN-Version> <Build-Date></Build-Date> <Client></Client> <Location></Location> <Image-Data-Type>UInt16</Image-Data-Type> </geoct-Identification-Section> <geoct-Recipe-Header-Section> <Recipe Latest="True"> <Name>AmyG</Name> </Recipe> </geoct-Recipe-Header-Section> <geoct-Acquisition-Section> <XRay-Source> <Model-Name>Thermo Kevex PSX10-65W</Model-Name> <XRay-Voltage units="kV">120.0</XRay-Voltage> <Spot-Size-Microns>39.000000</Spot-Size-Microns> </XRay-Source> <Geometry> <Source-Object-Distance units="mm">277.733</Source-Object-Distance> <Source-Detector-Distance units="mm">575.011</Source-Detector-Distance> <Detector-in-Plane units="degrees">-90.000</Detector-in-Plane> <Detector-Tilt units="degrees">0.000</Detector-Tilt> <Detector-Skew units="degrees">0.000</Detector-Skew> <Offset-Angle units="degrees">0.000</Offset-Angle> <Beam-Centre> <Horizontal-Position units="pixels">472.00</Horizontal-Position> <Vertical-Position units="pixels">369.00</Vertical-Position> </Beam-Centre> <User-Defined-Pixel-Size> <Enabled>No</Enabled> <Position-One units="pixels">0</Position-One> <Position-Two units="pixels">0</Position-Two> <Distance units="mm">0.0</Distance> <Is-Crosscore>No</Is-Crosscore> </User-Defined-Pixel-Size> </Geometry> <Motor-Movements> <Rotation> <Start-Angle units="degrees">0.000</Start-Angle> <Step units="degrees">0.200</Step> <End-Angle units="degrees">360.000</End-Angle> <Clockwise-Direction>1</Clockwise-Direction> <Start-Stop-Acquisition>0</Start-Stop-Acquisition> </Rotation> </Motor-Movements> <Detector> <Model-Name>Varian-2520DX</Model-Name> <Mode>2x2</Mode> <Frame-Rate>10.000</Frame-Rate> <Pixel-Size units="mm">0.254</Pixel-Size> <Averaging>10</Averaging> <Pixel-Scan-Height>960</Pixel-Scan-Height> <Pixel-Scan-Width>768</Pixel-Scan-Width> </Detector> </geoct-Acquisition-Section> <geoct-Recipe-Section> <Recipe Latest="True"> <Name>AmyG</Name> <Recipe-XML> <Geotek Description="Geotek Reconstructor Recipe" FileName="C:\Geotek\Settings\Reconstructor\Recipes\AmyG.xml" LastSavedUTC="12/02/2019 00:50:45"> <EditPassword type="String"></EditPassword> <Recipe> <Name type="String">AmyG</Name> <Type type="String">CT Rotational Reconstruction</Type> <ReconstructedOutput> <IncludeVolumeSinograms type="Boolean">False</IncludeVolumeSinograms> <IncludeVolumeSlices type="Boolean">False</IncludeVolumeSlices> <OutputAlongsideRawProjections type="Boolean">True</OutputAlongsideRawProjections> <OutputFolderPostFix type="String"></OutputFolderPostFix> <OutputFolderPrefix type="String"></OutputFolderPrefix> </ReconstructedOutput> <RotationalReconstruction> <Reconstruction> <ReconstructionThicknessPixels type="Int64">5</ReconstructionThicknessPixels> <CentreOfRotation> <AutomaticCalculation type="Boolean">True</AutomaticCalculation> <InterpolateAlongVolume type="Boolean">False</InterpolateAlongVolume> <ManuallyEntered type="Boolean">False</ManuallyEntered> <PresetTagFileValue type="Boolean">False</PresetTagFileValue> </CentreOfRotation> <CuppingCorrection> <AutomaticCalculation type="Boolean">False</AutomaticCalculation> <CorrectionFactors type="DoubleArray">0.7|0|0|0</CorrectionFactors> <EnableCorrection type="Boolean">True</EnableCorrection> </CuppingCorrection> <IntensityRange> <ManualIntensityMaximum type="Double">5</ManualIntensityMaximum> <ManualIntensityMinimum type="Double">-5</ManualIntensityMinimum> <SetManually type="Boolean">True</SetManually> </IntensityRange> <PitchAdjustment> <EnablePitch type="Boolean">False</EnablePitch> <PitchDegrees type="Double">0</PitchDegrees> </PitchAdjustment> <ReconFilter> <EnableFilter type="Boolean">True</EnableFilter> <FilterLevel type="Cardinal">150</FilterLevel> </ReconFilter> <RingFilter> <EnableFilter type="Boolean">True</EnableFilter> <FilterSizePixels type="Double">20</FilterSizePixels> </RingFilter> <YawAdjustment> <EnableYaw type="Boolean">False</EnableYaw> <YawDegrees type="Double">0</YawDegrees> </YawAdjustment> <OffsetOfCore> <XPixels> <Keys type="DoubleArray">1</Keys> <Values type="DoubleArray">-36</Values> </XPixels> <YPixels> <Keys type="DoubleArray">1</Keys> <Values type="DoubleArray">120</Values> </YPixels> </OffsetOfCore> </Reconstruction> <Projections> <CropFilter> <EnableCrop type="Boolean">False</EnableCrop> <LeftRightPixels type="Double">0</LeftRightPixels> <TopBottomPixels type="Double">0</TopBottomPixels> </CropFilter> <NormalisationReference> <EnableReference type="Boolean">False</EnableReference> <ReferenceValue type="Point">X=0,Y=0</ReferenceValue> </NormalisationReference> <NormalisationRegions> <EnableRegions type="Boolean">False</EnableRegions> <PixelLocations type="StringArray"></PixelLocations> </NormalisationRegions> <SpotFilter> <EnableFilter type="Boolean">True</EnableFilter> <FilterSizePixels type="Double">5</FilterSizePixels> </SpotFilter> </Projections> </RotationalReconstruction> </Recipe> </Recipe-XML> </Recipe Latest="True"> </geoct-Recipe-Section> </geotek-ct-recon>
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Unrepresentable_Domain:
These Geotek software-proprietary XML files contain information on CT scan acquisition settings and reconstruction settings. The values in the example provided may be different for each scan. Please contact the PCMSC data coordinator for more information on the contents of these XML files.
Attribute:
Attribute_Label: axial slice metadata file 'WholeCoreRecon.txt'
Attribute_Definition:
This Geotek software-proprietary TXT file contains information on CT scan acquisition settings and image scaling information. The following attributes and example attribute values are provided: CORE INFO --------- Version Number = 6 Core ID = GS18ROV26PC01-AG Section number = 1 Section Length = 48.19 Core Depth At Top = 0 X-Ray Voltage = 120 kV X-Ray Current = 234.7 uA X-Ray SpotSize = 39 microns Camera Name = Thermo Kevex PSX10-65W Average Of = 1 Detector Mode = 2x2 Comments = GEOMETRY -------- Mode = cone beam Last angle = 360° Offset angle= 0° Clock wise = 1 Pixel size = 0.25 mm Centre of rotation = 472 Source object distance = 277.73 mm Source detector distance = 575.01 mm Direction of rotation = clockwise Vertical centre = 369 Voxel Size = 0.1201 User set voxel size = 0 Calculated Voxel size = 0.1201 Helical Scan = 0 RANGE ----- Depth in section of first slice = 0.00 cm Slice interval = 0.012 cm First Slice = 1 Last Slice = 4119 Minimum Intensity (Raw Floating Point)= -0.3516 Maximum Intensity (Raw Floating Point)= 4.893821 Scale \$ Flip Complete = 1 Scatter Adjustment Active = 0 Horizontal centre = 472
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Unrepresentable_Domain:
These Geotek software-proprietary TXT files contain information on CT scan acquisition settings. The values in the example provided may be different for each scan. Please contact the PCMSC data coordinator for more information on the contents of these TXT files.
Attribute:
Attribute_Label: orthogonal view metadata files
Attribute_Definition:
These Geotek software-proprietary XML files contain information on CT scan acquisition settings and image scaling information. Each orthogonal TIFF file is accompanied by an XML file with the same filename. The following attributes and example attribute values are provided: <geotek-image> <image-type>giCTOrthogonalView</image-type> <coreID>GS18ROV26PC01-AG</coreID> <section-number>1</section-number> <physical-width>11.34</physical-width> <physical-height>49.47</physical-height> <physical-top>0</physical-top> <pixels-per-CM>83.26</pixels-per-CM> <horizontal-resolution>83.26</horizontal-resolution> <pixel-width>944</pixel-width> <scan-lines>4119</scan-lines> <comments></comments> <camera-name>Thermo Kevex PSX10-65W</camera-name> <average-of>1</average-of> <filename>Orthogonal000.tif</filename> <x-ray-voltage>120</x-ray-voltage> <x-ray-current>234.7</x-ray-current> <x-ray-spot-size>39</x-ray-spot-size> <source-object-distance>277.73</source-object-distance> <source-detector-distance>575.01</source-detector-distance> <detector-CCD-mode>2x2</detector-CCD-mode> <is-a-sync-scan-image>0</is-a-sync-scan-image> </geotek-image>
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Unrepresentable_Domain:
These Geotek software-proprietary XML files contain information on CT scan acquisition settings and image scaling information. The values in the example provided may be different for each scan. Please contact the PCMSC data coordinator for more information on the contents of these XML files.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GS ScienceBase
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States
Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description:
These data are available in TIFF format, including Geotek software-proprietary and CSDGM FGDC-compliant metadata.
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: TIFF
Format_Information_Content:
Downloadable zip files, ranging in size from 1.12 GB to 6.37 GB, contain folders with orthogonal and axial slice TIFF (.tif) images and associated software-proprietary metadata files (.xml). Zip file names correspond to the names of each core. For example ‘ROV26PC01.zip’ contains all CT TIFF images and associated metadata from push core ROV26PC01.
File_Decompression_Technique: Zip
Transfer_Size: 47270
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://www.sciencebase.gov/catalog/file/get/64640adbd34ec179a83d30e6
Network_Resource_Name:
https://www.sciencebase.gov/catalog/item/64640adbd34ec179a83d30e6
Network_Resource_Name: https://doi.org/10.5066/P96D02FG
Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of all data and metadata. The second points to a landing page with metadata and individual zipped data files of CT imagery. The third link points to the landing page for the entire data release.
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20240110
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: PCMSC Science Data Coordinator
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
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
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P96D02FG/LokiFavne-CT-metadata.html>
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