1887
Volume 74, Issue 2
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

The Kohima region, comprising the Naga‐Disang imbricated thrust belt of Schuppen, Brahmaputra foreland basin, and the adjoining Assam‐Arakan inner fold belt (IFB) of Indo Burmese ranges, is an important hydrocarbon province with environmental conditions that make it difficult for geophysical investigations. Here, we attempt the subsurface characterization of thrust–fold belts and synclinal basins using Bouguer gravity data. The source parameter imaging technique and tilt angle amplitudes of gravity data are used for estimating basement depths. The computed basement depth varies from 2 to 6 km, and overlying sediment thickness gradually increases eastward over the IFB. The inferred subsurface structures and tectonic fabric in this region mainly trend N–S, NNE–SSW, NE–SW, NW–SE, NWW–SEE and E–W. The selected gravity profiles and inversion‐modelling results provide insights into the concealed complex thrust geometry and basement configuration. We construct a conceptual model based on gravity modelling results, which bring out half‐graben structures and fault‐block features. These inferred structures are attributed to basement faults, steep anticlinal structures and synclinal basins that act as migration paths and oil traps and are potentially favourable zones for hydrocarbon resources.

© 2026 European Association of Geoscientists & Engineers. © 2026 European Association of Geoscientists & Engineers.
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2026-02-14
2026-03-13

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References

  1. Acharyya, S. K.1990. “Pan‐Indian Gondwana Plate Break‐Up and Evolution of the Northern and Eastern Collision Margins of the Indian Plate.” Journal of Himalayan Geology1: 75–91.
     [Google Scholar]
  2. Acharyya, S. K.2005. “Geology and Tectonics of NE India.” Journal of Geophysics26, no. 1: 35–49.
     [Google Scholar]
  3. Acharyya, S. K., K. K.Ray, and S.Sengupta. 1990. “Tectonics of Ophiolite Belt From Naga Hills and Andaman Islands, India.” Proceedings of the Indian Academy of Sciences—Earth and Planetary Sciences99: 187–199. https://doi.org/10.1007/BF02839389.
     [Google Scholar]
  4. Bilham, R., and P.England. 2001. “Plateau “Pop‐Up” in the Great 1897 Assam Earthquake.” Nature410: 806–809. https://doi.org/10.1038/35071057.
     [Google Scholar]
  5. Blakely, R. J.1995. Potential Theory in Gravity and Magnetic Applications. Cambridge University Press.
     [Google Scholar]
  6. Blakely, R. J., and R. W.Simpson. 1986. “Approximating Edges of Source Bodies From Magnetic or Gravity Anomalies.” Geophysics51, no. 7: 1494–1498. https://doi.org/10.1190/1.1442197.
     [Google Scholar]
  7. Choudhuri, M., P.Routray, B.Jana, and S.Mathur. 2023. “Timing the Mikir Hill Uplift in Assam Basin: Record of Stress Propagation Along the Eastern Margin of the Indian Plate.” Journal of Asian Earth Sciences X9: 100137. https://doi.org/10.1016/j.jaesx.2023.100137.
     [Google Scholar]
  8. Cooper, G. R. J., and D. R.Cowan. 2008. “Edge Enhancement of Potential‐Field Data Using Normalized Statistics.” Geophysics73, no. 3: H1–H4. https://doi.org/10.1190/1.2837309.
     [Google Scholar]
  9. Dasgupta, A. B.1977. “Geology of Assam‐Arakan Region.” Quarterly Journal of the Mining and Metallurgical Society of India49: 1–54.
     [Google Scholar]
  10. Dasgupta, A. B., and A. K.Biswas. 2000. Geology of Assam. Geological Society of India.
     [Google Scholar]
  11. Das Gupta, S., and M.Mukhopadhyay. 1993. “Seismicity and Plate Deformation Below the Andaman Arc, Northeastern Indian Ocean.” Tectonophysics225, no. 4: 529–542. https://doi.org/10.1016/0040‐1951(93)90314‐A.
     [Google Scholar]
  12. Dipok, K. B., K.Borah, R.Mahanta, and J. M.Borgohain. 2018. “Seismic B‐Values and Its Correlation With Seismic Moment and Bouguer Gravity Anomaly Over Indo‐Burma Ranges of Northeast India: Tectonic Implications.” Tectonophysics728–729: 130–141. https://doi.org/10.1016/j.tecto.2018.01.001.
     [Google Scholar]
  13. Eshaghzadeh, A.2017. “Depth Estimation Using the Tilt Angle of Gravity Field Due to the Semi‐Infinite Vertical Cylindrical Source.” Journal of Geological Research2017: 3513272.
     [Google Scholar]
  14. Essa, K. S., A. G.Nady, M. S.Mostafa, and M.Elhussein. 2018. “Implementation of Potential Field Data to Depict the Structural Lineament of the Sinai Peninsula, Egypt.” Journal of African Earth Sciences147: 43–53. https://doi.org/10.1016/j.jafrearsci.2018.06.013.
     [Google Scholar]
  15. Evans, P.1964. “Tectonic Framework of Assam.” Journal of the Geological Society of India5, no. 1: 80–90. https://doi.org/10.17491/jgsi/1964/050111.
     [Google Scholar]
  16. Gardner, G. H. F., L. W.Gardner, and A. R.Gregory. 1974. “Formation Velocity and Density—The Diagnostic Basics for Stratigraphic Traps.” Geophysics39, no. 6: 770–780. https://doi.org/10.1190/1.1440465.
     [Google Scholar]
  17. Gogoi, M., N.Mathur, T. S.Kumar, T.Walling, and S.Phukan. 2021. “Geochemical Characterization of Shales of the Eocene Disang Group, Kohima Syncline, India: Inferences to Hydrocarbon Potential and Depositional Environment.” Petroleum Research6, no. 1: 42–56. https://doi.org/10.1016/j.ptlrs.2020.09.001.
     [Google Scholar]
  18. GSI . 1998. Geological Map Series, North East India (NER). Geological Survey of India.
     [Google Scholar]
  19. GSI‐NGRI . 2006. Gravity Map Series of India on 1:2 Million Scale. Geological Survey of India and National Geophysical Research Institute.
     [Google Scholar]
  20. Kayal, J. R., S. S.Arefiev, S.Barua, et al. 2006. “Shillong Plateau Earthquakes in Northeast India Region: Complex Tectonic Model.” Current Science91, no. 1: 109–113.
     [Google Scholar]
  21. Kayal, J. R., and D.Zhao. 1998. “Three‐Dimensional Seismic Structure Beneath Shillong Plateau and Assam Valley, Northeast India.” Bulletin of the Seismological Society of America88, no. 3: 667–676. https://doi.org/10.1785/BSSA0880030667.
     [Google Scholar]
  22. Li, Y., and D. W.Oldenburg. 1998. “3‐D Inversion of Gravity Data.” Geophysics63, no. 1: 109–119. https://doi.org/10.1190/1.1444302.
     [Google Scholar]
  23. Maiti, S., and Ch.Ravi Kumar. 2024. “A Deep CNN‐LSTM Model for Predicting Interface Depth From Gravity Data Over Thrust and Fold Belts of North East India.” Journal of Asian Earth Sciences259: 105881. https://doi.org/10.1016/j.jseaes.2023.105881.
     [Google Scholar]
  24. Maiti, S., Ch.Ravi Kumar, P.Sarkar, R. K.Tiwari, and U.Srinu. 2019. “Interface Depth Modelling of Gravity Data and Altitude Variations: A Bayesian Neural Network Approach.” Neural Computing and Applications31, no. 6: 2467–2477. https://doi.org/10.1007/s00521‐019‐04276‐9.
     [Google Scholar]
  25. Miller, H. G., and V.Singh. 1994. “Potential Field Tilt—A New Concept for Location of Potential Field Sources.” Journal of Applied Geophysics32: 213–217. https://doi.org/10.1016/0926‐9851(94)90022‐1.
     [Google Scholar]
  26. Molnar, P., and P.Tapponnier. 1975. “Cenozoic Tectonics of Asia: Effects of a Continental Collision.” Science189: 419–426. https://doi.org/10.1126/science.189.4201.419.
     [Google Scholar]
  27. Mukhopadhyay, M.1984. “Seismotectonics of Transverse Lineaments in the Eastern Himalaya and Foredeep.” Tectonophysics109: 227–240. https://doi.org/10.1016/0040‐1951(84)90142‐2.
     [Google Scholar]
  28. Murty, K. N.1984. “Geology and Hydrocarbon Prospects of Assam Shelf: Recent Advances and Present Status.” Petroleum Asia Journal6, no. 4: 1–14.
     [Google Scholar]
  29. Nabighian, M. N.1972. “The Analytic Signal of Two Dimensional Magnetic Bodies With Polygonal Cross Section: Its Properties and Use for Automated Anomaly Interpretation.” Geophysics37, no. 2: 507–517. https://doi.org/10.1190/1.1440276.
     [Google Scholar]
  30. Nafe, J. E., and C. L.Drake. 1957. “Variation With Depth in Shallow and Deep Water Marine Sediments of Porosity, Density and the Velocities of Compressional and Shear Waves.” Geophysics22: 523–552. https://doi.org/10.1190/1.1438386.
     [Google Scholar]
  31. Nandy, D. R.1980. “Tectonic Pattern in North Eastern India.” Indian Journal of Earth Sciences7: 103–107.
     [Google Scholar]
  32. Nandy, D. R.2001. Geodynamics of North‐Eastern India and the Adjoining Region. ACB Publication.
     [Google Scholar]
  33. Oruc, B.2011. “Edge Detection and Depth Estimation Using Tilt Angle Map From Gravity Gradient Data of the Kozakli‐Central Anatolia Region, Turkey.” Pure and Applied Geophysics168, no. 10: 1769–1780. https://doi.org/10.1007/s00024‐010‐0211‐0.
     [Google Scholar]
  34. Oruc, B., and A.Keskinsezer. 2008. “Structural Setting of the Northeastern Biga Peninsula (Turkey) From Tilt Derivatives of Gravity Gradient Tensors and Magnitude of Horizontal Gravity Components.” Pure and Applied Geophysics165, no. 9: 1913–1927. https://doi.org/10.1007/s00024‐008‐0407‐8.
     [Google Scholar]
  35. Qadir, H. O., E. N.Baban, B. Q.Aziz, and H. A.Koyi. 2023. “Potential Field Survey of Subsurface Structures of the NW Segment of the Zagros Fold‐Thrust Belt, Kurdistan Region.” Geophysical Prospecting71: 1673–1690. https://doi.org/10.1111/1365‐2478.13401.
     [Google Scholar]
  36. Rao, R.1983. “Geology and Hydrocarbon Potential of a Part of Assam‐Arakan Basin and Adjacent Regions.” Petroleum Asia Journal6, no. 4: 127–158.
     [Google Scholar]
  37. Ravi Kumar, C., N.Kesiezie, B.Pathak, S.Maiti, and R. K.Tiwari. 2020. “Mapping of Basement Structure Beneath the Kohima Synclinorium, North‐East India via Bouguer Gravity Data Modelling.” Journal of Earth System Sciences129: 56. https://doi.org/10.1007/s12040‐019‐1326‐z.
     [Google Scholar]
  38. Ravi Kumar, C., A. S.Raj, B.Pathak, S.Maiti, and K.Naganjaneyulu. 2020. “High Density Crustal Intrusive Bodies Beneath Shillong Plateau and Indo Burmese Range of Northeast India Revealed by Gravity Data Modeling and Earthquake Data.” Physics of the Earth and Planetary Interiors307: 106555. https://doi.org/10.1016/j.pepi.2020.106555.
     [Google Scholar]
  39. Ravi Kumar, C., K.Ramesh, and Ramachandrappa. 2022. “Crustal Heterogeneities and Geothermal Gradients Beneath Thrust and Fold Belts of Northeast India From Scaled Spectral Analysis of Aeromagnetic and Gravity Modeling.” Journal of Earth System Sciences131: 145. https://doi.org/10.1007/s12040‐022‐01885‐2.
     [Google Scholar]
  40. Saha, D.2012. Integrated analysis of gravity and magnetic data in the Upper Assam Shelf and adjoining Schuppen Belt area—A critical review. Search and Discovery, AAPG/EAPG Digital Library, Article #30228.
  41. Salem, A., S.Williams, J. D.Fairhead, D. J.Ravat, and R.Smith. 2007. “Tilt‐Depth Method: A Simple Depth Estimation Method Using First‐Order Magnetic Derivatives.” Leading Edge26: 1502–1505. https://doi.org/10.1190/1.2821934.
     [Google Scholar]
  42. Srinivasan, V.2007. “Regional Structure Configuration and Seismic Pattern of ‘Belt of Schuppen’ in Northeast India.” Journal of the Geological Society of India70, no. 5: 801–814.
     [Google Scholar]
  43. Srivastava, V., R.Nakhro, and N.Pandey. 2013. “Geometry of Mesoscopic Folds in the Vicinity of Disang and Piphima Thrusts in Kohima District, Nagaland.” Journal of Scientific Research57: 1–10.
     [Google Scholar]
  44. Talwani, M., and J. R.Heirtzler. 1964. “Computation of Magnetic Anomalies Caused by Two‐Dimensional Bodies of Arbitrary Shape.” In Computers in the Mineral Industries, edited by G. A.Parks, 464–480. Geological Sciences.
     [Google Scholar]
  45. Thurston, J. B., and R. S.Smith. 1997. “Automatic Conversion of Magnetic Data to Depth, Dip, and Susceptibility Contrast Using the SPI™ Method.” Geophysics62, no. 3: 807–813. https://doi.org/10.1190/1.1444190.
     [Google Scholar]
  46. Tsokas, G. N.2000. “The Milos Island Bouguer Anomaly Revisited by Means of a Complex Attribute Analysis and Inferred Source Parameter Estimates.” Journal of the Balkan Geophysical Society3, no. 4: 77–86.
     [Google Scholar]
  47. Verduzco, B., J. D.Fairhead, C. M.Green, and C.MacKenzie. 2004. “New Insights Into Magnetic Derivatives for Structural Mapping.” Leading Edge23, no. 2: 116–119. https://doi.org/10.1190/1.1651454.
     [Google Scholar]
  48. Verma, R. K., and M.Mukhopadhyay. 1977. “An Analysis of the Gravity Field in Northeastern India.” Tectonophysics42: 283–317. https://doi.org/10.1016/0040‐1951(77)90171‐8.
     [Google Scholar]
  49. Verma, R. K., M.Mukhopadhyay, and M. S.Ahluwalia. 1976. “Seismicity, Gravity and Tectonics of Northeast India and Northern Burma.” Bulletin of the Seismological Society of America66: 1683–1694. https://doi.org/10.1785/BSSA0660051683.
     [Google Scholar]
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Subsurface Characterization of Thrust Belts and Synclinal Basins of the Kohima Region, NE India Through Gravity Modelling: Implication for Hydrocarbon Resources
Geophysical Prospecting 74, e70143 (2026); https://doi.org/10.1111/1365-2478.70143
/content/journals/10.1111/1365-2478.70143
/content/journals/10.1111/1365-2478.70143
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  • Article Type: Research Article
Keyword(s): gravity; imaging; interpretation; inversion; modelling; potential field

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