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Nagendran, G.
- Sequence Stratigraphy of Dalmiapuram formation, Kallakudi Quarry - II, South India
Abstract Views :228 |
PDF Views:2
Authors
Affiliations
1 Centre for Geosciencc and Engineering, Anna University, Chennai - 600 025, IN
2 Regional Geology Laboratory, Oil & Natural Gas Corporation Ltd., Chennai - 600 034, IN
3 Geology Division, ONGC, Tripura project, Badarghat complex, Agartala - 799 014, IN
1 Centre for Geosciencc and Engineering, Anna University, Chennai - 600 025, IN
2 Regional Geology Laboratory, Oil & Natural Gas Corporation Ltd., Chennai - 600 034, IN
3 Geology Division, ONGC, Tripura project, Badarghat complex, Agartala - 799 014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 3 (2002), Pagination: 249-258Abstract
A sequence stratigraphic framework is worked out for the first time for the Dalmiapuram Formation exposed in Kallakudi quarry near Kallakudi village in Tiruchirapalli District. Thc complete lithological succession of this formation is designated as 'Dalmiapuram Sequence' of latest Albian - Cenomanian age and consists of grey shale, coral/algal limestone and bedded biostromal limestone and marl in ascending order. Grey shale rests unconformably ovcr thc Archaean basement. This contact forms the lower sequencc boundary of Dalmiapuram Sequence. The middle lithounit, the coral algal limestone rests ovcr grey shale. This unit abruptly grades into bedded limestone/marl alternations. This abrupt termination of coral algal limestone may be due to relative sea level rise and possibly this surface represents 'drowning unconformity'. The upper lithounit, which has alternating bands of biostromal limcstonc and marl, might indicatc cyclic carbonate precipitation (?Milankovich cycles). This unit is unconformably overlain by Neogene Cuddalore sandstone. This unconformity surface represents the upper boundary of the sequencc. The entire Dalmiapuram Sequence appears to have been deposited as Transgressive Systems Tract (TST) dcposit and got exposed as a result of basinal rise.Keywords
Sequence Stratigraphy, Dalmiapuram Sequence, Albian-Cenomanian, Kallakudi, Tamil Nadu.- Morphometric Analysis of Barren Volcanic Base and Associated Tectonic Elements in the Andaman Fore-Arc Sub-Basin
Abstract Views :205 |
PDF Views:85
Authors
Affiliations
1 Marine and Coastal Survey Division, Geological Survey of India, Salt Lake, Kolkata 700 091, IN
1 Marine and Coastal Survey Division, Geological Survey of India, Salt Lake, Kolkata 700 091, IN
Source
Current Science, Vol 108, No 4 (2015), Pagination: 694-699Abstract
Although many studies have been undertaken on the Barren Island, the undersea configuration of the Barren Island Volcano (BIV) and associated morphotectonic elements, the modification imparted on them by the recent flows and the morphology of these flows are still poorly known. The present study identified thick lava flows along the western and southwestern slopes of Barren Island, extending up to the base of the Invisible Bank. The feeding locales for these thick flows are numerous parasitic cones picked up in the 3D grid model generated by the multibeam echo sounder. Morphology of the Barren volcanic base is largely modified by recent eruptions as they not only reduced the steepness of the Barren Volcano along the western slope, but also extended the base of the Barren Volcano to the base of the Invisible Bank. Furthermore, the present study also brought out other morphotectonic elements surrounding the BIV, viz. Alcock seamount towards the southeast, Invisible Bank flanked by west Andaman Fault in the west and a newly identified submarine volcanic mount as part of the Andaman Volcanic Arc towards the south.Keywords
Alcock Seamount, Barren Volcano, Geomorphology, West Andaman Fault.- Synthetic Aperture Sonar Image of Seafloor
Abstract Views :251 |
PDF Views:83
Authors
Saju Varghese
1,
A. Anil Kumar
1,
G. Nagendran
1,
V. Balachandrudu
1,
Nilofer Sheikh
1,
K. G. Mohan
1,
Kailash Singh
1,
B. Gopakumar
1,
Rajesh Joshi
1,
R. Rajasekhar
1
Affiliations
1 Marine & Coastal Survey Division, Geological Survey of India, Kolkata, IN
1 Marine & Coastal Survey Division, Geological Survey of India, Kolkata, IN