Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study

Polar research

U.K. Singh¹  T. Harinarayana²  K. Veeraswamy²  D.N. Murthy³  M. Santosh⁴ 

[1] Gujarat Energy Research and Management Institute, Raisan Village, Gandhinagar-382007, India;CSIR-National Geophysical Research InstituteUppal Road, Hyderabad-500007, India;CSIR-National Geophysical Research InstituteUppal Road, Hyderabad-500007, IndiaCorrespondence;Department of Applied GeophysicsIndian School of Mines, Dhanbad-826004, India;School of Earth Sciences and Resources, China University of Geosciences, No. 29 Xueyuan Road, Haidian District, Beijing-100083, China

关键词: Magnetotellurics;    Schirmacher Oasis;    crustal structure;    East Antarctica;    Mozambique Belt;    electrical conductivity;   

DOI  :  10.3402/polar.v32i0.17309

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Maitri Station (70.76°S; 11.73°E) is located in Schirmacher Oasis, a coastal nunatak in north-central Dronning Maud Land covering an area of 35 km2. Here, we report results from the first magnetotelluric experiments and delineate the deep electrical conductivity structure under Schirmacher Oasis using the data acquired during the 24th Indian Antarctic Scientific Expedition. The magnetotelluric method has the advantage of shallow to deeper level coverage as the data acquisition covers a wide frequency band of 10−3–103 Hz, permitting different penetration depths depending on the frequency and conductivity of the layer under investigation. The modelling results indicate the presence of a highly resistive (8000–10 000 ohm m) upper crust, which shows a lateral variation in thickness from 20 km (below site 6) in the east to 10 km (between sites 1 and 2) in the west. It is underlain by a less resistive (500–600 ohm m) lower crust. The highly resistive upper crustal structure supports the existing notion that wes...

【 授权许可】

CC BY-NC