Structure of Charnockitic basement in a part of the Krishna-Godavari basin, Andhra Pradesh |
| |
Authors: | I V Radhakrishna Murthy S Bangaru Babu |
| |
Institution: | (1) Department of Geophysics, Andhra University, 530 003 Visakhapatnam, India |
| |
Abstract: | A regional magnetic survey was carried out over an area of 8000 km2 in Godavari districts of Andhra Pradesh, India, which is covered by the rocks of Eastern Ghat Mobile Belt (EGMB)viz., the Khondalitic series and Charnockites in the northern half and Permian to Mesozoic and Cenozoic sediments in the southern
half, and forms a part of the Krishna-Godavari (K-G) basin. The survey brought out a strong NE-SW trending anomaly in the
area covered by the rocks of Eastern Ghat Mobile Belt (EGMB), and a mild ENE-WSW trending anomaly in the area covered by the
sediments of the Krishna-Godavari (K-G) basin. The NE-SW trending anomaly in the northern half could be attributed to the
exposed/near surface Charnockite basement that has come closer to the surface as a result of Eastern Ghat Mobile Belt (EGMB)
tectonics. Explanation of the mild ENE-WSW trending anomaly over the sediments of the Krishna-Godavari (K-G) basin required
a faulted magnetic basement at depth downthrown towards the south. It is therefore concluded that the Charnockitic basement
together with the Khondalite group of rocks which are folded and faulted during the different phases of tectonics of Eastern
Ghat Mobile Belt (EGMB) extend into the Krishna-Godavari (K-G) basin and further, were involved in faulting during the phases
of formation and sedimentation in the Krishna-Godavari (K-G) basin. |
| |
Keywords: | Eastern Ghat Mobile Belt magnetic survey magnetic basement tectonics |
本文献已被 SpringerLink 等数据库收录! |
|