1887
Volume 66, Issue 8
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

A constrained 3D density model of the upper crust along a part of the Deccan Syneclise is carried out based on the complete Bouguer anomaly data. Spectral analysis of the complete Bouguer gravity anomaly map of the study region suggests two major sources: short wavelength anomalies (<100 km) caused primarily due to the density inhomogeneities at shallow crustal level and long wavelength anomalies (>100 km) produced due to the sources deeper than the upper crust. A residual map of the short wavelength anomalies is prepared from the complete Bouguer anomaly using Butterworth high‐pass filter (100 km cut‐off wavelength). Utilizing the constraints from deep resistivity sounding, magnetotellurics and deep seismic sounding studies, 2.5D density models have been generated along 39 profiles of this region. The mismatch between the calculated response of the 2.5D model with the residual (short wavelength) gravity anomalies is minimized by introducing high‐density intrusive bodies (≥2.81 g/cm3) in the basement. With these 2.5D density models, the initial geometry of our 3D density model, which includes alluvium, Deccan trap, Mesozoic sediment and high‐density intrusive bodies in the basement up to a depth of 7 km (upper crust), is generated. In the final 3D model, Deccan trap extends from 200 m to nearly 1700 m below the 90–150 m thick Quaternary sediment. Further down, the sub‐trappean Mesozoic sediment is present at a depth range of 600–3000 m followed by the basement. The derived 3D density model also indicates six intrusive bodies of density 2.83 g/cm3 in the basement at an average depth of about 4–7 km that best fits the residual gravity anomaly of the study area.

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2018-08-22
2024-03-29
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References

  1. BartonP.J.1986. The relationship between seismic velocity and density in the continental crust‐ a useful constraint? Geophysical Journal of the Royal Astronomical Society87, 195–208.
    [Google Scholar]
  2. BeckerJ.J., SandwellD.T., SmithW.H.F., BraudJ., BinderB., DepnerJ.et al. 2009. Global bathymetry and elevation data at 30 arc seconds resolution: SRTM30_PLUS. Marine Geodesy32, 355–371.
    [Google Scholar]
  3. BhattacharjiS., ChatterjeeN., WamplerJ.M., NayakP.N., and DeshmukhS.S.1996. Indian intraplate and continental margin rifting, lithospheric extension, and mantle upwelling in Deccan Flood Basalt volcanism near the K/T Boundary: evidence from mafic dyke swarms. Journal of Geology104, 379–398.
    [Google Scholar]
  4. BhattacharjiS., SharmaR. and ChatterjeeN.2004. Two and three‐dimensional gravity modelling along western continental margin and intraplate Narmada‐Tapti rifts: its relevance to Deccan flood basalt volcanism. Journal of Earth System Sciences113, 771–784.
    [Google Scholar]
  5. BlakelyR.J.1988. Curie temperature isotherm analysis and tectonic implications of aeromagnetic data from Nevada. Journal of Geophysical Research (Solid Earth)93, 11817–11832.
    [Google Scholar]
  6. BlakelyR.J.1996. Potential Theory in Gravity and Magnetic Applications, p. 252. Cambridge University Press.
    [Google Scholar]
  7. BoisC., BoucheP. and PeletR.1982. Global geologic history and distribution of hydrocarbon reserves. AAPG Bulletin66, 1248–1270.
    [Google Scholar]
  8. CadyJ.W.1977. Calculation of gravity and magnetic anomalies along profiles with end corrections and inverse solutions for density and magnetization. Open‐File Report No. 77‐463. Reston, USA: US Geological Survey.
    [Google Scholar]
  9. CadyJ.W.1980. Calculation of gravity and magnetic anomalies of finite‐length right polygonal prisms. Geophysics45, 1507–1512.
    [Google Scholar]
  10. ChakrabortyK., AgarwalB.N.1992. Mapping of crustal discontinuities by wavelength filtering of the gravity field. Geophysical Prospecting40, 801–822.
    [Google Scholar]
  11. ChakravarthiV., ShankarG.B.K., MurlidharanD., HarinarayanaT. and SunderrajanN.2007. An integrated geophysical approach for imaging sub‐basalt sedimentary basins: case study of Jam River Basin, India. Geophysics72, B141–B147.
    [Google Scholar]
  12. ChenetA.L., QuidelleurX., FluteauF., CourtillotV. and BajpaiS.2007. 40K–40Ar dating of the Main Deccan large igneous province: further evidence of KBT age and short duration. Earth and Planetary Science Letters263, 1–15.
    [Google Scholar]
  13. GallardoL.A. and MejuM.A.2007. Joint two‐dimensional cross gradient imaging of magnetotelluric and seismic travel‐time data for structural and lithological classification. Geophysical Journal International169, 1261–1272.
    [Google Scholar]
  14. GMSI
    GMSI2006. Gravity map series of India 2006 having 5 mGal contour interval at 1:5 million scale. A joint collaborative project of Geological Survey of India, National Geophysical Research Institute, Oil and Natural Gas Corporation Ltd., Survey of India, and Oil India Ltd. Kolkata: Geological Survey of India.
    [Google Scholar]
  15. GoyalP. and TiwariV.M.2014. Application of the continuous wavelet transform of gravity and magnetic data to estimate sub‐basalt sediment thickness. Geophysical Prospecting62, 148–157.
    [Google Scholar]
  16. GSI
    GSI1998. Geological Map of India on 1:2,000,000 Scale. Kolkata, India: Geological Survey of India Publication.
  17. HahnA., KindE.G. and MishraD.C.1976. Depth estimation of magnetic sources by means of Fourier amplitude spectra. Geophysical Prospecting24, 287–306.
    [Google Scholar]
  18. HolligerK. and KisslingE.1992. Gravity interpretation of a unified 2‐D acoustic image of the central Alpine collision zone. Geophysical Journal International111, 213–225.
    [Google Scholar]
  19. HuestisS.P. and AnderM.E.1983. IDB2‐A Fortran program for computing extremal bounds in gravity data interpretation. Geophysics48, 999–1010.
    [Google Scholar]
  20. JacobsenB. H.1987. A case for upward continuation as a standard separation filter for potential‐field maps. Geophysics52, 1138–1148.
    [Google Scholar]
  21. KumarD., BastiaR. and GuhaD.2004. Prospect hunting below Deccan basalt: imaging challenges and solutions. First Break22, 35–39.
    [Google Scholar]
  22. LeveilleJ.P., JonesLan F., ZhouZheng‐Zheng, WangBin and LiuFaqi. 2011. Subsalt imaging for exploration, production and development: a review. Geophysics76, 3–20.
    [Google Scholar]
  23. MartiniF., BeanC.J., DolanS.S. and MarsanD.2001. Seismic image quality beneath strongly scattering structures and implications for lower crustal imaging: numerical simulations. Geophysical Journal International145, 423–435.
    [Google Scholar]
  24. MurtyA.S., SainK., TewariH.C. and PrasadB.R.2008. Crustal velocity inhomogeneities along the Hirapur–Mandla profile, Central India and its tectonic implications. Journal of Asian Earth Sciences31, 533–545.
    [Google Scholar]
  25. Nageswara RaoB., SinghB., SinghA.P. and TiwariV.M.2013. Resolving sub‐basalt geology from joint analysis of gravity and magnetic data over the Deccan trap of Central India. Geohorizons18, 57–63.
    [Google Scholar]
  26. NGRI
    NGRI . 2009. Integrated geophysical studies for hydrocarbon exploration in eastern part of the Deccan Syneclise, Central India. NGRI Technical Report No. NGRI‐2009‐Exp‐679 (Restricted). Hyderabad: NGRI.
    [Google Scholar]
  27. PandeyD., SinghS., SinhaM. and MacGregorL.2009. Structural imaging of Mesozoic sediments in Kachchh, India, and their hydrocarbon prospects. Marine and Petroleum Geology26, 1043–1050.
    [Google Scholar]
  28. Parker, R.L.1972. The rapid calculation of potential anomalies. Geophysical Journal of the Royal Astronomical Society31, 447–455.
    [Google Scholar]
  29. ParkerR.L.1974. Best bounds on density and depth from gravity data. Geophysics39, 644–649.
    [Google Scholar]
  30. ParkerR.L.1975. The theory of ideal bodies for gravity interpretation, Geophysical Journal of the Royal Astronomical Society42, 315–334.
    [Google Scholar]
  31. PatroB.P.K., HarinarayanaT., SastryR.S., RaoM., ManojC., NaganjaneyuluK.et al. 2005. Electrical imaging of Narmada‐Son lineament Zone, Central India from magnetotellurics. Physics of the Earth and Planetary Interior148, 215–232.
    [Google Scholar]
  32. PatroB.P.K. and SarmaS.V.S.2007. Trap thickness and the subtrappean structures related to mode of eruption in the Deccan plateau of India: results from magnetotellurics. Earth Planets Space59, 75–81.
    [Google Scholar]
  33. PatroB.P.K. and SarmaS.V.S.2016. Evidence for an extensive intrusive component of the Deccan Large Igneous Province in the Narmada Son Lineament region, India from three‐dimensional magnetotelluric studies. Earth and Planetary Science Letters451, 168–176.
    [Google Scholar]
  34. QureshyM.N.1971. Relation of gravity to elevation and rejuvenation of blocks in India. Journal of Geophysical Research76, 545–557.
    [Google Scholar]
  35. RaoC.K., OgawaY., GokarnS.G. and GuptaG.2004. Electrical imaging of the magma across the Narmada Son Lineament, Central India. Earth Planets Space56, 229–238.
    [Google Scholar]
  36. RaoP.K. and ReddyP.R.2005. A cost‐effective strategy in conducting integrated geophysical studies in trap covered country. Journal of the Geological Society of India55, 80–91.
    [Google Scholar]
  37. Satish KumarT., DayalA.M. and SudarshanV.2014. Surface geochemical data evaluation and integration with geophysical observations for hydrocarbon prospecting, Tapti graben Deccan Syneclise, India. Geoscience Frontiers5, 419–428.
    [Google Scholar]
  38. Satpal SinghO.P., SarD., ChatterjeeS.M. and SawaiS.2006. Integrated interpretation for sub‐basalt imaging in Saurashtra basin, India. The Leading Edge25, 882–885.
    [Google Scholar]
  39. ShankarR.1988. Heat flow map of India and discussions on its geological and economic significance. Indian Minerals42, 89–110.
    [Google Scholar]
  40. SinghA.P.1998. 3‐D structure and geodynamic evolution of accreted igneous layer in the Narmada‐Tapti region (India). Journal of Geodynamics25, 129–141.
    [Google Scholar]
  41. SinghA.P. and MeissnerR.1995. Crustal configuration of the Narmada‐Tapti region (India) from gravity studies. Journal of Geodynamics20, 111–127.
    [Google Scholar]
  42. SpectorA. and GrantF.S.1970. Statistical models for interpreting aeromagnetic data. Geophysics35, 293–302.
    [Google Scholar]
  43. SridharA.R. and TewariH.C.2001. Existence of sedimentary graben in the western part of Narmada Zone: seismic evidence. Journal of Geodynamics31, 19–31.
    [Google Scholar]
  44. TalwaniM. and HeirtzlerJ.R.1964. Computation of magnetic anomalies caused by two‐dimensional structures of arbitrary shape. In: Computers in the Mineral Industries, Part-1 (ed. G.A.Parks ), pp. 464–480. Stanford Univ. Publ., Geological Sciences.
    [Google Scholar]
  45. TalwaniM., WorzelJ.L. and Landisman, M.1959. Rapid gravity computations for two‐dimensional bodies with application to the Mendocino submarine fracture zone. Journal of geophysical research64, 49–59.
    [Google Scholar]
  46. VardhanC.V., KumarB., KumananC.J., ManiD. and PatilD.J.2008. Hydrocarbon prospects in sub‐trappean Mesozoic Deccan Syneclise, India: evidence from surface geochemical prospecting. Search and Discovery Article #10143.
  47. Venkat RaoK. and NayakP.N.1995. Geophysical studies in Narmada‐Tapti valleys, Malwa plateau, and Satpura region, Central India, under 'Project CRUMANSONATA'. Geological Survey of India Special Publication10, 155–180.
    [Google Scholar]
  48. VermaR.K. and BanerjeeP.1992. Nature of the continental crust along the Narmada‐Son lineament inferred from gravity and deep seismic sounding. Tectonophysics202, 375–397.
    [Google Scholar]
  49. WeiJu, HouG. and HariK.R.2013. Mechanics of Mafic dyke swarms in the Deccan large igneous province: paleostress field modelling. Journal of Geodynamics66, 79–91.
    [Google Scholar]
  50. WithersR., EggersD., FoxT. and CrebsT.1994. A case study of integrated hydrocarbon exploration through basalt. Geophysics59, 1666–1679.
    [Google Scholar]
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  • Article Type: Research Article
Keyword(s): Gravity; Interpretation; Inversion; modelling

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