Magnetic polarity stratigraphy (MPS) is constructed with paleomagnetic parameters for the Campanian–Maastrichtian (Upper Cretaceous) onshore sediment sequences of the Cauvery Basin, southern India. Twenty-nine sedimentary outcrops in the vicinity of Ariyalur district of Tamil Nadu, India were studied. The mean ChRM produce Dm= 338, Im= –38, (α95=23.91°, k = 15.73, N=60). The mean VGP is estimated at 51.33°N, 292.71°E deriving a paleolatitude of 21.3°S. The composite MPS of these sequences comprises of 12 magnetozones (6 normal and 6 reversed events) that are corroborated with Chron C33n to Chron C30n of the GPTS. The derived paleolatitude position from the present study places Indian subcontinent at little shallow southern latitudes indicating moderately higher drift velocities during Upper Cretaceous.
Fig. Lithostratigraphy versus magnetic polarity stratigraphy (MPS) of the studied Ariyalur Upper Cretaceous sections, Cauvery Basin, southern India.
Figure: Migration of the Indian subcontinent after the Gondwana break-up and position of the Cauvery Basin during Upper Cretaceous.
Venkateshwarlu, M; J Earth Syst Sci 129, 222 (2020). https://doi.org/10.1007/s12040-020-01476-z