Magnetometrics in the Study of Sub-surface Structures of Antarctica Margin.

Access URI: http://npdc.ncaor.gov.in/npdc/search_mf_data.action?search=freeText&expedition_type=all&parameter=MF1021470910&userType=user&freeTextValue=Magnetometrics+in+the+Study+of+Sub-surface+Structures+of+Antarctica+Margin.

Brief Description (Abstract):

During the second Indian Antartica expedition in addition to monitoring time variation in the geomagnetic field components a preliminary ground based magnetic survey was conducted Magneto metric data obtained along six 10 -15 km long profiles, after correction for transient and day- day variability are examined in the form of magnetic profiles and anomaly contour map . Qualitative interpretation of data suggests the presence of a north- south trending rift structure on the topographic ridge between 10- 12 E. The structure appears to be northward continuation of rift valley mapped on the continental margin of the Princes Astrid coast. The rift structure appears to terminate against a sharp discontinuity.

Status: Completed

Purpose: The study of continental margin has received the attention of several workers in the past two decades. It is well recognised that in geological sense the coastal line is not the true boundary between continent and ocean. The rocks and structures seen on land extend under the sea and hence the real boundary between the continent and ocean must be looked for far out to sea. The average equality of free-air gravity anomalies over both oceans and continents, established in the beginning of century, suggested an is ostatic balance between continents and ocean basins with either a shallower depth to Moho and /or denser crust and upper mantle beneath the ocean basins Subsequent seismic and gravity modelling have confirmed that the crust-mantle boundary rose from30-35 km depth beneath the continent to a depth of 10 km beneath the ocean basins over a transition zone of approximately 200 km wide.

Presentation Format: Documentdigital

Distribution Format: Solid Earth

Distribution Format Version: unknown

Supplemental Information:

TableDigital

Keyword(s): Earth Science-Solid Earth,

Place/Location(s): Dakshin Gangotri, Antarctic,

Project: Magnetometrics in the Study of Sub-surface Structures of Antarctica Margin,

Topic Category(s): GeoScientific Information,

Date(s): 2020-08-24 (Creation),

Resource Contact(s):
1. Name : Dr. BR Arora
    Role : PrincipalInvestigator
    Phone : 8322525515
    E-Mail : ictd [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Distributor Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : Distributor
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Metadata Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : PointOfContact
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Extent:
Start Date : 1982-01-01
End Date   : 1983-12-31