Basalt Pillars on the Main Endeavour Field

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: J.R. Delaney

Originator: Veronique Robigou

Originator: Russell E. McDuff

Originator: M. K. Tivey

Publication_Date: 19921210

Publication_Time: Unknown

Title: Basalt Pillars on the Main Endeavour Field

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: Journal of Geophysical Research

Issue_Identification: Vol. 97, No. B13, pages 19,663-79,682

Publication_Information:

Publication_Place: Journal of Geophysical Research

Publisher: American Geophysical Union

Other_Citation_Details:

This coverage was produced as part of the article entitled; Geology of a Vigorous Hydrothermal on the Endeavour Segment, Juan de Fuca Ridge. All of the above citation information relates to that article.

Online_Linkage: <http://bromide.ocean.washington.edu/gis/>

Larger_Work_Citation:

Citation_Information:

Originator: National Science Foundation

Publication_Date: Unknown

Publication_Time: Unknown

Title: Ridge Observatory Experiment (ROBE)

Series_Information:

Publication_Information:

Other_Citation_Details:

NSF 95 132 Replaces NSF 93-134 The National Science Foundation continues to support the development of the RIDGE (Ridge Inter-Disciplinary Global Experiments) Initiative and invites proposals directed toward the program elements EXECUTIVE SUMMARY Over the coming years, RIDGE will initiate a comprehensive long-term program on the Juan de Fuca Ridge designed to conduct in-depth inquiries into the issues of how and why temporal change occurs along major sections of the global spreading center network. This document provides a framework for the first five years of a major, focused effort to examine change and covariation among the physical, chemical and biological components of a modern ridge crest environment. It also lays out the research motivation, site selection rationale, examples of potential experiments, infrastructure, and seagoing capabilities needed to conduct an ensemble of coordinated projects designed to explore the time domain in a well-studied, readily accessible portion of mid-ocean ridge crest. In broad terms, it lays out priorities in the form of phasing among key elements of the program.

Online_Linkage: <http://ridge.unh.edu/observatory/framework.html>

Description:

Abstract:

These data describe the location and extent of basalt talus or apron on the Main Endeavour Field. A detailed, high resolution geologic map was prepared from these coverages and can be found in the article cited. The coverages represent the geological boundaries established using Alvin video records in combination with high resolution, in-hull Alvin navigation from 1988 and 1991 dive series.

Purpose:

These data were created to aid in the description and discovery of the workings of the hydrothermal system found on the Endeavour Segment of the Juan de Fuca Ridge.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Range_of_Dates/Times:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 19880000

Single_Date/Time:

Calendar_Date: 19910000

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -129.0997

East_Bounding_Coordinate: -129.0969

North_Bounding_Coordinate: 47.9502

South_Bounding_Coordinate: 47.9466

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Basalt Talus or Apron

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Juan de Fuca Ridge

Place_Keyword: Main Endeavour Field

Stratum:

Stratum_Keyword_Thesaurus: None

Stratum_Keyword: Seafloor Spreading Ridge

Temporal:

Temporal_Keyword_Thesaurus: None

Temporal_Keyword: 1988 & 1991 Alvin Dives

Access_Constraints: None

Use_Constraints:

Make reference to the source of the data on any hard copy products.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Organization_Primary:

Contact_Organization: University of Washington

Contact_Person: Russ McDuff

Contact_Address:

Address_Type: mailing address

Address:

University of Washington, School of Oceanography PO BOX 357940

City: Seattle

State_or_Province: WA

Postal_Code: 98195

Country: USA

Contact_Voice_Telephone: (206) 543-3058

Contact_Facsimile_Telephone: (206) 543-6073

Contact_Electronic_Mail_Address: mcduff@ocean.washington.edu

Security_Information:

Native_Data_Set_Environment: ARC/INFO

Cross_Reference:

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Series_Information:

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Data_Quality_Information:

Attribute_Accuracy:

Logical_Consistency_Report:

The locational information in this data set is related to the positional accuracy. The identification of the objects in the data set was interpreted from still, video and SONAR imagery and is subject to the interpretation of the investigators.

Completeness_Report:

The data for the dives made at this site and time are complete. More dives will be made in the future.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

These data were logged by the DSRV Alvin using an in-hull navigation system. The system uses the travel time of accoustic energy from the submersible to the transponders and back to the submersible (rather than submersible-transponder-ship). The accurracy was measured at +/- 1.5 meters.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 3

Horizontal_Positional_Accuracy_Explanation:

A full explanation of the method used for the assesment of accuracy can be found in the text of the article cited.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Vertical control was provided by the pressure sensor and altimeter readings on the submersible. The vertical accuracy is +/- 2 meters.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 2

Vertical_Positional_Accuracy_Explanation:

A full description of the tests used to compare the in-hull system with the conventional ACNAV ship navigation system.

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Process_Step:

Process_Description:

These data were interpreted by the investigators using Submersible observations,video records, high precision in-hull navigation and side-scan SONAR. The imagery were used to interpret the location and identification of the structures at the site and to create a geologic map of the vent field.

Process_Date: Unknown

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Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 9

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -129.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: Coordinate pair

Coordinate_Representation:

Abscissa_Resolution:

Ordinate_Resolution:

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: GRS 80

Semi-major_Axis: 6378137.0000000

Denominator_of_Flattening_Ratio: 298.26

Local:

Local_Description:

Most data collected at the vent field scale in the Endeavour area have been referenced to the UW local ALVIN grid. As navigational precision (through use of "in-hull" data) and accuracy (by referencing to p-code GPS) has improved, there have been problems with registration of features within the vent field. All data collected here have been converted to UTM Zone 9 using the best location for the origin of the UW local ALVIN grid as 47 53.634N 129 09.871W.

Local_Georeference_Information:

The original data for the RIDGE Multibeam Synthesis Project Area 12 Grid was collected by NOAA/ORD/ERL/PMEL investigators from the NOAA ships Surveyor and Discoverer. These data can be obtained from their web //hp2.pmel.noaa.gov/gis/jdf/jdfbathy.html In 1996, Deborah Kelley, University of Washington, conducted a survey of the Endeavour Observatory area using the Krupp-Atlas Hydrosweep System on the RV //bromide.ocean.washington.edu/gis/active.html

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Metadata_Reference_Information:

Metadata_Date: 19980723

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Organization_Primary:

Contact_Organization: University of Washington

Contact_Person: Russ McDuff or Veronique Robigou

Contact_Position: Prof. Dept. of Oceanography

Contact_Address:

Address_Type: mailing address

Address:

University of Washington School of Oceanography PO BOX 357940

City: Seattle

State_or_Province: WA

Postal_Code: 98195

Country: USA

Contact_Voice_Telephone: (206) 543-3058

Contact_Facsimile_Telephone: (206) 543-6073

Contact_Electronic_Mail_Address: mcduff@ocean.washington.edu

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Security_Information: