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Mineralogical and Textural Characteristics of Red Boles of Western Deccan Volcanic Province, India: Genetic and Paleoenvironmental Implications

Singh, Pragya, Le Pera, Emilia, Bhattacharya, Satadru, Pande, Kanchan, Banerjee, Santanu·2021·Society of Earth Scientists Series
DOI 10.1007/978-3-030-71370-6_23
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Research works printed but not linked: 103

  1. Affolter MD, Ingersoll RV (2019) Quantitative analysis of volcanic lithic fragments. J Sed Res 89:479–486 · DOI
  2. Andò S, Garzanti E, Padoan M, Limonta M (2012) Corrosion of heavy minerals during weathering and: a catalogue for optical analysis. Sediment Geol 280:165–178 · DOI
  3. Andrieux P, Petit S (2010) Hydrothermal synthesis of dioctahedral smectites: the Al–Fe3+ chemical series: Part I: influence of experimental conditions. App Clay Sci 48:5–17 · DOI
  4. Ahmad M, Shrivastava JP (2008) Compositional studies on clays associated with the intra-volcanic bole horizons from the Eastern: palaeoenvironmental implications. Mem Geol Soc India 74:299–321
  5. Beane JE, Turner CA, Hooper PR, Subbarao KV, Walsh JN (1986) Stratigraphy, composition and form of the Deccan basalts, Western Ghats, India. Bull Volcanol 48:61–83 · DOI · Paper page
  6. Berger G, Schott J, Loubet M (1987) Fundamental processes controlling the first stage of alteration of a basalt glass by seawater: an experimental study between 200 and 320 C. Earth Planet Sci Lett 84:431–445 · DOI
  7. Bhattacharya S, Mitra S, Gupta S, Jain N, Chauhan P, Parthasarathy G (2016) Jarosite occurrence in the Deccan Volcanic Province of Kachchh, western India: Spectroscopic studies on a Martian analog locality. J Geophys Res 121:402–431 · DOI
  8. Bishop JL, Lane MD, Dyar MD, Brown AJ (2008) Reflectance and emission spectroscopy study of four groups of phyllosilicates: smectites, kaolinite-serpentines, chlorites and micas. Clay Miner 43:35–54 · DOI
  9. Bishop JL, Loizeau D, McKeown NK, Saper L, Dyar MD, Des Marais DJ, Parente M, Murchie SL (2013) What the ancient phyllosilicates at Mawrth Vallis can tell us about possible habitability on early Mars. Planet Space Sci 86:130–149 · DOI
  10. Bishop J, Madejova J, Komadel P, Froschl H (2002a) The influence of structural Fe, Al, and Mg on the infrared OH bands in spectra of dioctahedral smectites. Clay Miner 37:607–616 · DOI
  11. Bishop JL, Murad E (2005) The visible and infrared spectral properties of jarosite and alunite. Am Miner 90:1100–1107 · DOI
  12. Bishop JL, Murad E, Dyar MD (2002b) The influence of octahedral and tetrahedral cation substitution on the structure of smectites and serpentines as observed through infrared spectroscopy. Clay Mineral 37:617–628 · DOI
  13. Bishop JL, Pieters CM, Edwards JO (1994) Infrared spectroscopic analyses on the nature of water in montmorillonite. Clays Clay Miner 42:702–716 · DOI
  14. Cas RA, Wright JV (1987) Volcanic successions: modern and ancient: a geological approach to processes. Products and Successions, Allen and Unwin, London · DOI
  15. Cawood PA (1991) Nature and record of igneous activity in the Tonga Arc, SW Pacific, deduced from the phase chemistry of derived detrital grains. In: Morton AC, Todd SP, Haughton PDW (eds) Developments in sedimentary provenance studies. Geol Soc Spec Publ 57:305–21 · DOI
  16. Chenet AL, Fluteau F, Courtillot V, Gérard M, Subbarao KV (2008) Determination of rapid Deccan eruptions across the Cretaceous-Tertiary boundary using paleomagnetic secular variation: Results from a 1200 m-thick section in the Mahabaleshwar escarpment. J Geophys Res 113:B04101. https://doi.org/10.1029/2006JB004635 · DOI · Paper page
  17. Chipera SJ, Goff F, Goff CJ, Fittipaldo M (2008) Zeolitization of intracaldera sediments and rhyolitic rocks in the 1.25 Ma lake of Valles caldera, New Mexico, USA. J Volcanol Geotherm Res 178:317–330 · DOI
  18. Clark RN, King VVT, Klejwa M, Swayze GA, Vergo N (1990) High spectral resolution reflectance spectroscopy of minerals. J Geophys Res 95:12653–12680 · DOI
  19. Cox KG, Hawkesworth CJ (1985) Geochemical stratigraphy of the Deccan Traps at Mahabaleshwar, Western Ghats, India, with implications for open system magmatic processes. J Petrol 26:355–377 · DOI · Paper page
  20. Critelli S, Arribas J, Le Pera E, Tortosa A, Marsaglia KM, Latter KK (2003) The recycled orogenic sand provenance from an uplifted thrust belt, Betic Cordillera, Southern Spain. J Sed Res 73:72–81 · DOI
  21. Critelli S, Ingersoll RV (1995) Interpretation of neovolcanic versus palaeovolcanic sand grains: an example from miocene deep-marine sandstone of the Topanga Group (southern California). Sedimentol 42:783–804 · DOI
  22. Crovisier JL, Honnorez J, Eberhart Jp (1987) Dissolution of basaltic glass in seawater: mechanism and rate. Geochim Cosmochim Acta 51:2977–2990 · DOI
  23. Dickinson WR (1970) Interpreting detrital modes of greywacke and arkose. J Sed Pet 40:695–707
  24. Duraiswami RA, Sheth H, Gadpallu P, Youbi N, Chellai EH (2020) A simple recipe for red bole formation in continental flood basalt provinces: weathering of flow-top and flow-bottom breccias. Arab J Geosci 13:1–14 · DOI
  25. Ehlmann BL, Berger G, Mangold N, Michalski JR, Catling DC, Ruff SW, Chassefière E, Niles PB, Chevrier V, Poulet F (2013) Geochemical consequences of widespread clay mineral formation in Mars’ ancient crust. Space Sci Rev 174:329–364 · DOI
  26. Ehlmann BL, Mustard JF, Swayze GA, Clark RN, Bishop JL, Poulet F, Des Marais DJ, Roach LH, Milliken RE, Wray JJ, Barnouin-Jha O, Murchie SL (2009) Identification of hydrated silicate minerals on Mars using MRO CRISM: geologic context near Nili Fossae and implications for aqueous alteration. J Geophys Res E: Planets 114. https://doi.org/10.1029/2009JE003339 · DOI · Paper page
  27. Emeleus CH, Allwright EA, Kerr AC, Williamson IT (1996) Red tuffs in the palaeocene lava successions of the inner hebrides. Scottish J Geol 32:83–89 · DOI
  28. Fedoroff N, Courty MA, Guo Z (2010) Palaeosoils and relict soils. In: Stoops G, Marcelino V, Mees F (eds) Interpretation of micromorphological features of soils and regoliths. Elsevier, Amsterdam, pp 623–662 · DOI
  29. Fisher RV, Schmincke H-U (1984) Pyroclastic rocks. Springer-Verlag, Berlin · DOI
  30. Frost RL, Kloprogge JT, Ding Z (2002) Near-infrared spectroscopic study of nontronites and ferruginous smectite. Spectrochim Acta A Mol Biomol Spectrosc 58:1657–1668 · DOI
  31. García-Romero E, Vegas J, Baldonedo JL, Marfil R (2005) Clay minerals as alteration products in basaltic volcaniclastic deposits of La Palma (Canary Islands, Spain). Sediment Geol 174:237–253 · DOI
  32. Gavin P, Chevrier V, Sayyed MRG, Islam R (2010) Spectral analysis of Deccan paleosols, India: Analog for phyllosilicates on Mars. In: 41st Lunar planet science conference, p 1904
  33. Gavin P, El Senousy A, Chevrier V, Sayyed MRG and Islam R (2011) Spectral properties of Deccan paleosols, India: implications for thermally altered phyllosilicates on Mars. In: 42nd Lunar planet science conference, p 1905
  34. Gérard M, Caquineau S, Chenet AL, Fluteau F, Courtillot V, Subbarao KV (2006) Red boles in the Deccan traps: time constraints from alteration processes. Geophys Res Abstr 8:07092
  35. Glasmann JR, Simonson GH (1985) Alteration of basalt in soils of Western Oregon. Soil Sci Soc America 49:262–273 · DOI
  36. Gottardi G (1989) The genesis of zeolites. Eur J Mineral 1:479–488 · DOI
  37. Greenberger RN, Mustard JF, Kumar PS, Dyar MD, Breves EA, Sklute EC (2012) Low temperature aqueous alteration of basalt: mineral assemblages of Deccan basalts and implications for Mars. J Geophys Res 117:E00J12. https://doi.org/10.1029/2012je004127 · DOI
  38. Harder H (1972) The role of magnesium in the formation of smectite minerals. Chem Geol 10:31–39 · DOI
  39. Hay RL (1966) Zeolites and zeolitic reactions in sedimentary rocks. GSA Spec Pap 85:1–130
  40. Hunt GR, Ashley RP (1979) Spectra of altered rocks in the visible and near infrared. Econ Geol 74:1613–1629 · DOI
  41. Iijima A (1986) Occurrence of natural zeolites. J Clay Sci Soc Jpn 26:90–103
  42. Jacobsson SP (1978) Environmental factors controlling the palagonitisation of the Surtsey tephra, Iceland. Bull Geol Soc Denmark 27:91–105 · DOI
  43. Jacobsson SP, Moore JG (1980) Through Surtsey. Unique hole shows how volcano grew. Geotimes 25:14–16
  44. Kale VS, Bodas M, Chatterjee P, Pande K (2020) Emplacement history and evolution of the Deccan Volcanic Province, India. Episodes 43:278–299 · DOI
  45. Kale VS, Dole G, Shandilya P, Pande K (2019) Stratigraphy and correlations in Deccan Volcanic Province, India: Quo vadis? GSA Bull 132:588–607 · DOI
  46. Le Pera E, Morrone C (2018) Heavy minerals distribution and provenance in modern beach sands of Campania, Italy. Rendiconti Online Soc Geol Ital 45:136–140
  47. Le Pera E, Morrone C (2020) The use of mineral interfaces in sand-sized volcanic rock fragments to infer mechanical durability. J Palaeogeogr 9:21. https://doi.org/10.1186/s42501-020-00068-8 · DOI
  48. Lee YI, Klein GD (1986) Diagenesis of sandstones in the back-arc basins of the Western Pacific Ocean. Sedimentol 33:651–675 · DOI
  49. Louime C, Onokpise O, Vasanthaiah H (2011) Deformed and dragged red bole horizon near Pune, Maharashtra. Curr Sci 100:1488
  50. Lundberg N (1991) Detrital record of the early Central American magmatic arc: Petrography of intraoceanic forearc sandstones, Nicoya Peninsula, Costa Rica. GSA Bull 103:905–915 · DOI
  51. Marsaglia KM (1992) Petrography, provenance of volcaniclastic sands recovered from the Izu-Bonin Arc, Leg 126: Proc Ocean Drill Program. Sci Res 126:139–54 · DOI
  52. Marsaglia K (1993) Basaltic island sand provenance. In: Johnsson MJ, Basu A (eds) Processes controlling the composition of clastic sediments. GSA Spec Pap 284:41– 65 · DOI
  53. Moore DM, Reynolds Jr RC (1989) X-ray diffraction and the identification and analysis of clay minerals. Oxford University Press (OUP), Oxford
  54. Morris RV, JrHV Lauer, Lawson CA, JrEK Gibson, Nace GA, Stewart C (1985) Spectral and other physicochemical properties of submicron powders of hematite (α-Fe2O3), maghemite (γ-Fe2O3), magnetite (Fe3O4), goethite (α-FeOOH), lepidocrocite (γ-FeOOH). J Geophys Res 90:3126–3144 · DOI
  55. Morrone C, De Rosa R, Le Pera E, Marsaglia KM (2017) Provenance of volcaniclastic beach sand in a magmatic-arc setting: an example from Lipari island (Aeolian archipelago, Tyrrhenian Sea). Geol Mag 154:804–828 · DOI
  56. Morrone C, Le Pera E, Marsaglia KM, De Rosa R (2020) Compositional and textural study of modern beach sands in the active volcanic area of the Campania region (southern Italy). Sediment Geol 396:105567 · DOI
  57. Naveen Sarkar S, Kumar TN, Ray D, Bhattacharya S, Shukla AD, Moitra H, Dagar A, Chauhan P, Sen K, Das S (2018) Mineralogy and spectroscopy (VIS near infrared and micro-Raman) of chromite from Nidar ophiolite complex, SE Ladakh, India: implications for future planetary exploration. Planet Space Sci 165:1–9 · DOI
  58. Pauly BD, Schiffman P, Zierenberg RA, Clague DA (2011) Environmental and chemical controls on palagonitization. Geochem Geophys Geosys 12:1–26 · DOI
  59. Peacock MA, Fuller RE (1928) Chlorophaeite, sideromelane and palagonite from the Columbia River Plateau. Am Miner 13:360–383
  60. Renaut RW (1993) Zeolitic diagenesis of late Quaternary fluviolacustrine sediments and associated calcrete formation in the Lake Bogoria Basin, Kenya Rift Valley. Sedimentol 40:271–301 · DOI
  61. Renne PR, Sprain CJ, Richards MA, Self S, Vanderkluysen L, Pande K (2015) State shift in Deccan volcanism at the Cretaceous-Paleogene boundary, possibly induced by impact. Science 350:76–78 · DOI · Paper page
  62. Retallack GJ (1991) Untangling the effects of burial alteration and ancient soil formation. Ann Rev Earth Planet Sci 19:183–206 · DOI
  63. Retallack GJ (2001) Soils of the past: an introduction to paleopedology, 2nd edn. Blackwell Science, United Kingdom · DOI
  64. Sarkar PK, Chakranarayan AB, Deshwandikar AK, Fernandes MR, Raut SD (2000) Development of pencil joints in a red bole bed at Dighi, Raigad district, Maharashtra, India. Curr Sci 79:1422–1423
  65. Sayyed MRG, Hundekari SM (2006) Preliminary comparison of ancient bole beds and modern soils developed upon the Deccan volcanic basalts around Pune (India): Potential for palaeoenvironmental reconstruction. Quat Int 156:189–199 · DOI
  66. Sayyed MRG, Pardeshi RG, Islam R (2014) Palaeoweathering characteristics of an intrabasaltic red bole of the Deccan Flood Basalts near Shrivardhan of Western coast of India. J Earth Sys Sci 123:1717–1728 · DOI
  67. Schipper CI, Jakobsson SP, White JD, Palin JM, Bush-Marcinowski T (2015) The Surtsey magma series. Sci Rep 5:11498. https://doi.org/10.1038/srep11498 · DOI
  68. Schmincke HU (1981) Ash from vitric muds in deep sea cores from the Mariana Trough and fore-arc region (South Philippine Sea) (Sites 453, 454, 455, 458, 459 and SP), Deep Sea Drilling Project, Leg 60. In: Hussong DM, Uyeda S (eds) Initial reports of the deep-sea drilling project, Washington DC: US Government Printing Office, vol 60, pp 473–481 · DOI
  69. Schoene B, Samperton KM, Eddy MP, Keller G, Adatte T, Bowring SA, Khadri SFR, Gertsch B (2015) U-Pb geochronology of the Deccan Traps and relation to the end-Cretaceous mass extinction. Science 384:182–184 · DOI · Paper page
  70. Schott J, Berner RA (1985) Dissolution mechanisms of pyroxenes and olivines during weathering. In: Drever JI (ed) The chemistry of weathering. Springer, Dordrecht, pp 35–53 · DOI
  71. Sherman DM, Waite TD (1985) Electronic spectra of Fe3+ oxides and oxide hydroxides in the near IR to near UV. Am Miner 70:1262–1269
  72. Sheth HC (2005) From Deccan to Reunion: no trace of a mantle plume. In: Foulger GR, Natland JB, Presnall DC, Anderson DL (eds) Plates, plumes, and paradigm. GSA Spec Pap 388:477–501 · DOI
  73. Sheth H, Vanderkluysen L, Demonterova EI, Ivanov AV, Savatenkov VM (2019) 40Ar/39Ar of the Nandurbar Dhule mafic dyke swarm: Dyke sill flow correlations and stratigraphic development across the Deccan flood basalt province. Geol J 54:157–176 · DOI · Paper page
  74. Shukla AD, Ray D, Pande K, Shukla PN (2014) Formation of paleosol (fossil soil) in Deccan continental flood basalt: alteration style and implications towards aqueous environments of early Mars. In: Eighth international conference on mars. Pasadena, California, pp 1194
  75. Singer A (1970) Edaphoids and paleosols of basaltic origin in the Galilee, Israel. J Soil Sci 21:290–296 · DOI
  76. Singer A, Ben-Dor E (1987) Origin of red clay layers interbedded with basalts of the Golan Heights. Geoderma 39:293–306 · DOI
  77. Singer A, Wieder M, Gvirtzman G (1994) Paleoclimate deduced from some early Jurassic basalt-derived paleosols from Northern Israel. Palaeo Palaeo Palaeo 111:73–82 · DOI
  78. Smith KL, Milnes AR, Eggleton RA (1987) Weathering of basalt: formation of iddingsite. Clays Clay Miner 35:418–428 · DOI
  79. Smith WW (1962) Weathering of some Scottish basic igneous rocks with reference to soil formation. J Soil Sci 13:202–215 · DOI
  80. Spinola DN, de Castro Portes R, Schaefer CEGR, Solleiro-Rebolledo E, Pi-Puig T, Kühn P (2017) Eocene paleosols on King George Island, Maritime Antarctica: macromorphology, micromorphology and mineralogy. CATENA 152:69–81 · DOI
  81. Srivastava P, Sangode SJ, Meshram DC, Gudadhe SS, Venkateshwarlu M (2012) Palaeoweathering and depositional conditions in the interflow sediment units (bole beds) of Deccan Volcanic Province, India: a mineral magnetic approach. Geoderma 177(178):90–109 · DOI
  82. Srivastava P, Sangode SJ, Torrent J (2015) Mineral magnetic and diffuse reflectance spectroscopy characteristics of the Deccan Volcanic bole beds: implications to genesis and transformations of iron oxides. Geoderma 239:317–330 · DOI
  83. Srivastava P, Siva Siddaiah N, Sangode SJ, Meshram DC (2018) Mineralogy and geochemistry of various coloured boles from the Deccan volcanic province: implications for palaeoweathering and palaeoenvironmental conditions. CATENA 167:44–59 · DOI
  84. Stroncik NA, Schmincke HU (2002) Palagonite—a review. Int J Earth Sci 91:680–697 · DOI
  85. Stoops G, Marcelino V (2018) Lateritic and bauxitic materials. In: Stoops G, Marcelino V, Mees F (eds) Interpretation of micromorphological features of soils and regoliths. Elsevier, Amsterdam, pp 691–720 · DOI
  86. Stoops G, Schaefer CEGR (2018) Pedoplasmation: formation of soil material. In: Stoops G, Marcelino V, Mees F (eds) Interpretation of micromorphological features of soils and regoliths. Elsevier, Amsterdam, pp 59–74 · DOI
  87. Subbarao KV, Chandrasekharam D, Navaneethakrishnan P, Hooper PR (1994) Stratigraphy and structure of parts of the Central Deccan Basalt Province: eruptive models. In: Subbarao KV (ed) Volcanism. Wiley Eastern Ltd, New Delhi, India, pp 321–332
  88. Vaidyanadhan R, Ramakrishan M (2008) Geology of India, vol 2. Geol Soc India, Bangalore
  89. Valdiya KS (2016) The making of India: geodynamic evolution, 2nd ed. Springer International · DOI
  90. Velbel MA (1993) Formation of protective surface layers during silicate-mineral weathering under well-leached, oxidising conditions. Am Miner 78:408–417
  91. Velbel MA (2009) Dissolution of olivine during natural weathering. Geochim Cosmochim Acta 73:6098–6113 · DOI
  92. Velbel MA (2014) Etch-pit size, dissolution rate, and time in the experimental dissolution of olivine: implications for estimating olivine lifetime at the surface of Mars. Am Miner 99:2227–2233 · DOI
  93. Velde B (1995) Composition and mineralogy of clay minerals. In: Vede B (ed) Origin and mineralogy of clays. Springer, Berlin, Heidelberg, pp 8–42 · DOI
  94. Velde B (2000) Clay minerals: a physico-chemical explanation of their occurrence. Elsevier, Amsterdam
  95. Verma O, Khosla A (2019) Developments in the stratigraphy of the Deccan Volcanic Province, peninsular India. C R Geosci 351:461–476 · DOI
  96. Vijaya Kumar K, Chavan C, Sawant S, Naga Raju K, Kanakdande P, Patode S, Deshpande K, Krishnamacharyulu SKG, Vaideswaran T, Balaram V (2010) Geochemical investigation of a semi-continuous extrusive basaltic section from the Deccan volcanic province, India: implications for the mantle and magma chamber processes. Contrib Miner Petrol 159:839–862 · DOI
  97. Walker GPL (1999) Some observations and interpretations on the Deccan Traps. Geol Soc India Mem 43:367–395
  98. Widdowson M, Walsh JN, Subbarao KV (1997) The geochemistry of Indian bole horizons: palaeoenvironmental implications of Deccan intravolcanic palaeosurfaces: recognition, reconstruction and palaeoenvironmental interpretation. Geol Soc Lond Spec Publ 120:269–281 · DOI
  99. Wilkins A, Subbarao KV, Ingram G, Walsh JN (1994) Weathering regimes within the Deccan basalts. In: Subbarao KV (ed) Volcanism. Wiley Eastern, New Delhi, pp 217–223
  100. Wilshire HG (1958) Alteration of olivine and orthopyroxene in basic lavas and shallow intrusions. Am Miner 43:120–147
  101. Wilson MJ (2004) Weathering of the primary rock-forming minerals: processes, products and rates. Clay Miner 39:233–266 · DOI
  102. Zhou Z, Fyfe WS (1989) Palagonitization of basaltic glass from DSDP Site 335, Leg 37; textures, chemical composition, and mechanism of formation. Am Miner 74:1045–1053
  103. Zhu S, Zhu X, Wang X, Liu Z (2012) diagenesis and its control on petroleum of Permian in northwestern margin of Junggar Basin, China. Sci China Earth Sci 55:386–396 · DOI

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Metadata

Authors
Singh, P., Le Pera, E., Bhattacharya, S., Pande, K., & Banerjee, S.
Venue
Society of Earth Scientists Series
Publisher
Springer International Publishing
Published
2021
Pages
697-722
ISSN
  • 2194-9204
  • 2194-9212
DOI
10.1007/978-3-030-71370-6_23
Cited by
4
References
2
Language
en
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CoChat. (2026). Citation check: Mineralogical and Textural Characteristics of Red Boles of Western Deccan Volcanic Province, India: Genetic and Paleoenvironmental Implications. https://app.cochat.ai/papers/10.1007/978-3-030-71370-6_23
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Singh, P., Le Pera, E., Bhattacharya, S., Pande, K., & Banerjee, S. (2021). Mineralogical and Textural Characteristics of Red Boles of Western Deccan Volcanic Province, India: Genetic and Paleoenvironmental Implications. Society of Earth Scientists Series. https://doi.org/10.1007/978-3-030-71370-6_23