Delineation of Tectonic Features of Schumacher Oasis, East Antarctica Using Total Field Geomagnetic Profiling.

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Brief Description (Abstract):

Delineation of tectonic features of Schirmacher Oasis (S.O.) using total field geomagnetic profiling needs skill because: a. The exposed rocks have little magnetic contrast and have undergone multiple episodes of metamorphism, migmatization and deformation. b. The lithological contacts are sharp and generally steeply dipping, with the faults and shears trending east-west. c. Topography is very rugged, dotted by numerous water bodies during summer and the north-south extent of S.O. on an average is 1.0 km and d. Geomagnetic storms are sudden, large, frequent and long lasting, allowing few fortuitous windows for meaningful observations.

Status: Completed

Purpose: The main objective of the present magnetic survey was to obtain magnetic response of the geological units and structural features inferred from the photo-geological map of Bormann et al. (1986). Accordingly several traverses were planned and laid. A close station spacing (5-6m) was found necessary in view of the peculiar geology and the magnetic properties of rocks described above. Observations were made only on relatively magnetic quiet days, which are rare in these parts. Longer profiles were not possible because of (i) very rugged, uneven topography and (ii) numerous water bodies with meltwater accumulating in the troughs. A Portable Proton Precession magnetometer (Geometries G 816/826 A) with an accuracy of 1.0 nT was used for the field measurements. Another Proton Precession magnetometer (NGRI 600 R), also with 1.0 nT accuracy, was continuously run at Maitri coupled to a poly-chart recorder (T0A ETR 200 A) for monitoring the diurnal variation of the earths total magnetic field.

Presentation Format: Documentdigital

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Supplemental Information:

TableDigital

Keyword(s): Earth Science-Solid Earth,

Place/Location(s): Queen Maud Land, Antarctic,

Project: Delineation of Tectonic Features of Schumacher Oasis,

Topic Category(s): GeoScientific Information,

Date(s): 2020-09-15 (Creation),

Resource Contact(s):
1. Name : Dr. Madhu Sudan Joshi
    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 : 1993-01-01
End Date   : 1994-12-31