Science Keywords>SOLID EARTH>GEOMAGNETISM>MAGNETIC ANOMALIES

Aeromagnetic data over the Central Transantarctica Mountains (CTAM)

Federal Geographic Data Committee (FGDC) Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: E. D. Anderson, C. A. Finn, D. Damaske, J. D. Abraham, F. Goldman
Publication_Date: Unknown
Title: Aeromagnetic data over the Central Transantarctica Mountains (CTAM)
Edition:
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Series_Information:
Series_Name:
Issue_Identification:
Publication_Information:
Publication_Place:
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Other_Citation_Details:
Online_Linkage:
Description:
Abstract:
Near complete coverage of the East Antarctic shield by ice hampers geological study of crustal architecture important for understanding global tectonic and climate history. Limited exposures in the central Transantarctic Mountains (CTAM), however, show that Archean and Proterozoic rocks of the shield as well as Neoproterozoic-lower Paleozoic sedimentary successions were involved in oblique convergence associated with Gondwana amalgamation. Subsequently, the area was overprinted by Jurassic magmatism and Cenozoic uplift. To extend the known geology of the region to ice-covered areas, we conducted an aeromagnetic survey flown in draped mode by helicopters over the Transantarctic Mountains and by fixed-wing aircraft over the adjacent polar plateau. We flew >32,000 line km covering an area of nearly 60,000 km2 at an average altitude of 600 m, with average line spacing 2.5 km over most areas and 1.25 km over basement rocks exposed in the Miller and Geologists ranges. Additional lines flown to true north, south and west extended preliminary coverage and tied with existing surveys. Gravity data was collected on the ground along a central transect of the helicopter survey area. From December 2003 to January 2004, the CTAM group flew a helicopter and twin-otter aeromagnetic survey and collected gravity station data on the ground in profile form. These data will be integrated with other geologic and geophysical data in order to extend the known geology of the region to ice-covered areas.
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20031227
Ending_Date: 20040125
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 139.27539
East_Bounding_Coordinate: 170.21844
North_Bounding_Coordinate: -82.35733
South_Bounding_Coordinate: -83.95234
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > GEOMORPHOLOGY > TECTONIC LANDFORMS/PROCESSES
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITATIONAL FIELD
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC ANOMALIES
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > TECTONIC LANDFORMS
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS > FAULT MOVEMENT
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS
Theme_Keyword: HELICOPTER
Theme_Keyword: DHC-6 > DEHAVILLAND TWIN OTTER
Theme_Keyword: MAGNETOMETERS
Theme_Keyword: MAM > MAGNETIC FIELD INSTRUMENT
Theme_Keyword: Aeromagnetic Data
Theme_Keyword: Central Transantarctic Mountains
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: STRUCTURE
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > ANTARCTICA
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: CAROL A FINN
Contact_Position: INVESTIGATOR
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: U.S. Geological Survey
Address: MS 964
Address: Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-236-1345
Contact_Facsimile_Telephone: 303-236-1229
Contact_Electronic_Mail_Address: cfinn@usgs.gov
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The data in this file were collected by a single contractor (CTAM) who were responsible for collecting and processing the data. The data from this survey were collected using the same instruments (magnetometers and navigational systems) throughout the survey and were collected in a normal length of time with no long delays between survey beginning and end. Standard industry practices of the time were followed in data collection and processing. High- resolution horizontal position of the survey aircraft used to collect data were determined from GPS satellites. Positioning data were recorded in-flight independently using a Trimble 4000 and an Ashtech Surveyor 12 receivers. When possible a differential position was calculated. When not an autonomous position was used. Positions were good to one meter when differentially processed and 20 meters when autonomous was used. The cesium magnetometer is accurate to about 0.002 nanoteslas (nT) at 1 Hz and the proton precession base station magnetometer is accurate to about 1 nT. Therefore the accuracy of the base station corrected data is 1 nT or better.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 625 meters
Longitude_Resolution: 625 meters
Geographic_Coordinate_Units: Decimal degrees
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: DOI/USGS/GD/MRP > Mineral Resource Program, Geology Division, U.S. Geological Survey, U.S. Department of the Interior
Contact_Person: CAROL A FINN
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: U.S. Geological Survey
Address: MS 964
Address: Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-236-1345
Contact_Facsimile_Telephone: 303-236-1229
Contact_Electronic_Mail_Address: cfinn@usgs.gov
Resource_Description: nsf0232042
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://minerals.usgs.gov/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: None
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Metadata_Reference_Information:
Metadata_Date: 20050816
Metadata_Review_Date: 20080829
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: CAROL A FINN
Contact_Position: INVESTIGATOR
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: U.S. Geological Survey
Address: MS 964
Address: Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-236-1345
Contact_Facsimile_Telephone: 303-236-1229
Contact_Electronic_Mail_Address: cfinn@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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