The evolution of the east coast of India

Petrophysical and geomechanical properties of rocks from the oilfields of the Krishna-Godavari and Cauvery Basins, India

“…A series of horst and graben structures dominate the K-G basin while an alignment of NE-to SW-trending elongated ridges and sub-basins dominates the Cauvery basin (Sastri et al 1981;Prabhakar et al 1995). The Vedaranniyam High is located to the east of the Nagapattinam sub-basin and is aligned N±S (Sastri et al 1981).…”

“…The 12 samples from the K-G basin ranged in age from Permo-Triassic to Miocene, while the ten from the Cauvery basin (through the courtesey of Oil and Natural Gas Corporation, India) accumulated between the Cretaceous and the Tertiary. Figures 1 and 2 show the distribution of wells in the K-G and Cauvery basins together with the regional tectonic trend and the more obvious structures of the K-G and Cauvery basins as mapped by Oil and Natural Gas Corporation (Sastri et al 1973(Sastri et al , 1981.…”

“…The Vedaranniyam High is located to the east of the Nagapattinam sub-basin and is aligned N±S (Sastri et al 1981). The core samples collected from the major oil/gas ®elds in K-G basin were from depths of between 2,024 and 3,311 m: ) near the Ravva oil ®eld.…”

The Plate Tectonic History of the Past Tethys Ocean

“…2), and the geological constraints lead us to reject solutions that rely on Du Toil's approach to East Gondwana and are used commonly by the kinematicians. Fundamentally, these solutions fit Southeast India to Antarctica (A type) (Smith and Hallam, 1970;Veevers et aI., 1975;Powell et al, 1980;Smith et al, 1981;Lawver and Scotese, 1987;Yoshida et al, 1992), while an opposite school (Crawford, 1969;Veevers et aI., 1971;Shields, 1977;Sastri et al, 1981;Archbold, 1983;Hamilton, 1983) fit southeast India to northwest Australia (B type). Two lines of evidence indicate that A-type solutions are less satisfactory than B solutions.…”

Regional Seismic and Tsunami Susceptibility Assessment of ChennaiNagapattinam Coast of Tamilnadu and Pondicherry

“…Structurally the basin is of horst-graben type which includes several depressions separated by subsurface basement ridges trending in NE-SW direction such as Ariyalur-Pondicherry graben, Madanam ridge, Tranquebar graben, Karaikal ridge, Nagapattinam graben etc ( Sastri et al 1981).In addition to above basement faults, the E-W trending Palar, Cauvery and Vellar lineaments, the NNE-SSW trending lineament near the Usteri tank, west of Pondicherry, and NE-SW trending crystalline-sedimentary fault are the major crustal weak zones in the coastal area between Chennai and Nagapattinam. The north south trending Tirumullaivasal -Kodikarai fault is seen as straight coast with adjoining wider continental shelf (Gopalakrishnan 1996).…”