Geochemistry of phosphate bearing sedimentary rocks in parts of Sonrai block, Lalitpur District, Uttar Pradesh, India

Khan, K. F.; Dar, Shamim A.; Khan, Saif

doi:10.1016/j.chemer.2012.01.003

Cited by 18 publications

(14 citation statements)

References 17 publications

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“…At low temperatures under near surface conditions, the aqueous solution should be dominantly trivalent, except perhaps in alkaline, very strongly reducing pore waters of anoxic marine sediments (Sverjensky, 1984). Therefore, Eu anomalies in fossil biogenic apatite and phosphate concretions have often been associated with strongly reducing environments (e.g., Iliopoulos et al, 2010) regardless if the anomaly is positive (e.g., Kidder et al, 2003;Jiang et al, 2007;Khan et al, 2012;Garnit et al, 2012) or negative (e.g., Kowal-Linka et al, 2014;Fadel et al, 2015).…”

Section: Eu Anomaliesmentioning

confidence: 97%

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Preservation of successive diagenetic stages in Middle Triassic bonebeds: Evidence from in situ trace element and strontium isotope analysis of vertebrate fossils

et al. 2015

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Section: Eu Anomaliesmentioning

confidence: 97%

“…Ce anomalies More frequently than europium anomalies, the cerium anomaly (Ce/Ce*) N has been used to address redox states in phosphorites during their diagenesis (e.g., Elderfield and Pagett, 1986;Wright et al, 1987;Morad and Felitsyn, 2001;Girard and Lécuyer, 2002;Kemp and Trueman, 2003;Jiang et al, 2007;Khan et al, 2012).…”

Section: Eu and Ce Anomaliesmentioning

confidence: 99%

Preservation of successive diagenetic stages in Middle Triassic bonebeds: Evidence from in situ trace element and strontium isotope analysis of vertebrate fossils

et al. 2015

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“…The Bijawar basin in Lalitpur district is located at the extreme southwest corner of Uttar Pradesh (Fig. 1) [6,7,[9][10][11]15,16]. The basin is 28 km long and 5 km wide and shows an east-west extension.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Bundelkhand Granitoids Complex with pegmatite and quartz veins Table 1. Stratigraphy of the Bijawar Group in Lalitpur Basin, India (after 6,7,[9][10][11]15,16).…”

Section: Sonrai Formationmentioning

confidence: 99%

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Depositional Environment of Phosphorites of the Sonrai Basin, Lalitpur District, Uttar Pradesh, India

Dar¹,

Khan²

2016

Applied Studies of Coastal and Marine Environments

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Phosphates are regarded as one of the most important fertilizer minerals used by man. In Sonrai basin of Lalitpur the phosphorites are found to occur as lenticular and detached bodies throughout the Formation of the "ijawar Group. Individual bodies range from a few meters to about km in length, and width varies from thin bands to about meter with P O concentration ranging from to %. The Paleoproterozoic "ijawar Group are overlain by the "rchaean "undelkhand "asement Complex and underlain by Vindhyan Supergroup. The occurrence of phosphorites is confined to the Sonrai Formation which consists of massive to brecciated phosphorite within the lower reddish shales, with at least three bands identified. Megascopic study reveals that the brecciated phosphorite is reddish brown in color and fine to medium grained with angular fragments of chert and quartz embedded in a groundmass of iron oxides and secondary silica intercalated with minor veins of chert and iron oxides. The phosphorite horizon in the Lalitpur area is associated with pink to white brecciated massive quartzite, shale, dolomite and limestone of the basal unit. The concentration trends of certain major oxides indicate that the phosphorites are more enriched in CaO, P O and SiO than "l O , Fe O , TiO , Na O and K O. The concentration trends of trace elements reveal that the phosphorites are moderately enriched in Co, Zn, Zr, Pb, U than in Sc, "a, V, Cr, Ni, , Rb, Sr, Y and Th. The dispersion patter, correlation coefficient and mutual relationship of significant major oxides represented by plotted diagrams, indicate that SiO , CaO, MgO are antipathetically related with P O . The relationship suggests a gradual replacement among these oxides during diagenesis. High values of P O and CaO in the phosphorites indicate more concentration of apatite constituent. The difference in geochemical behavior of CaO and MgO may be due to ionic substitution of Ca + by MgO + in the apatite crystal lattice during alkaline environment of the basin. The strong negative relationship between P O with Fe O in phosphorites may be due to leaching and/mild weathering of iron from the ores and reprecipitation along with P O in the pore spaces, cavities/voids, veins, etc in highly oxidizing marine environment of the basin. The minimum evidence of organic matter, absence of sulphide minerals and lower concentration of V, Ni, and

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Petro-mineralogical Studies of the Paleoproterozoic Phosphorites in the Sonrai basin, Lalitpur District, Uttar Pradesh, India

Dar

Khan

et al. 2014

Nat Resour Res

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Geochemistry of phosphate bearing sedimentary rocks in parts of Sonrai block, Lalitpur District, Uttar Pradesh, India

Cited by 18 publications

References 17 publications

Preservation of successive diagenetic stages in Middle Triassic bonebeds: Evidence from in situ trace element and strontium isotope analysis of vertebrate fossils

Preservation of successive diagenetic stages in Middle Triassic bonebeds: Evidence from in situ trace element and strontium isotope analysis of vertebrate fossils

Depositional Environment of Phosphorites of the Sonrai Basin, Lalitpur District, Uttar Pradesh, India

Petro-mineralogical Studies of the Paleoproterozoic Phosphorites in the Sonrai basin, Lalitpur District, Uttar Pradesh, India

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