Rare earth element geochemistry of the Permo-Carboniferous clastic sedimentary rocks from the Spiti Region, Tethys Himalaya: significance of Eu and Ce anomalies

Ganai, Javid A.; Rashid, Shaik A.

doi:10.1007/s11631-015-0045-7

Cited by 12 publications

(9 citation statements)

References 51 publications

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“…Debris derived from continents generally displays minimal or no fractionation of LREEs compared with HREEs. In contrast, seawater generally displays enriched HREE contents, negative Ce anomalies, and positive Y anomalies (Bau and Dulski, 1996;Cao et al, 2012;Ganai and Rashid, 2015).…”

Section: Rees Patterns and Ce Anomaliesmentioning

confidence: 98%

Reconstruction of the paleo-marine environment during the Ediacaran-Cambrian transition: new insights from geochemical proxies, northern Tarim Platform, Northwest China

Fan,

Zhu

et al. 2024

Front. Earth Sci.

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The Cambrian Terreneuvian Yuertusi Formation of the Tarim Basin, regarded as a potential hydrocarbon source rock (TOCmax = 29.8 wt%), preserves the record of the Ediacaran to Cambrian Series 2 transition. This study presents a high-resolution multi-proxy investigation of the Sugaitebulake and Yutixi sections of the NW Tarim Basin. Evidence of hydrothermal activity and euxinic conditions in the earliest Cambrian has been delineated by samples from the lower part of the Yuertusi Formation group A, featured by weakly positive Ce anomalies (Ce/Ce*avg. = 0.46), extremely positive Eu anomalies (Eu/Eu*avg. = 26.39), Y/Ho ratios (Y/Hoavg. = 40.48) and several barite layers. Mo and U covariation suggests that the Yuertusi Formation group A and Xiaoerbulake Formation were deposited under sulfidic conditions, whereas the Ediacaran Qigebulake Formation, and Yuertusi Formation groups B and C and D accumulated under suboxic to anoxic conditions. The basin has been weakly restricted and characterized by elevated productivity (Ba-excessavg. = 6,410.42 ppm) during Terreneuvian time. Suboxic conditions in late Ediacaran time (Qigebulake Formation) became euxinic conditions in association with increased sea level and productivity sustained by hydrothermal activity and upwelling, which have been preserved in the organic-rich lower part of the Yuertusi Formation. Suboxic conditions were reestablished during the Cambrian Terreneuvian time as reflected in the geochemistry of the upper part of the Yuertusi Formation. Euxinic conditions were once again established early in Cambrian Series 2 Xiaoerbulake Formation. Euxinic conditions were coincident with transgressions of the South Tianshan Ocean during that interval. The accumulation and preservation of organic matter of the Early Cambrian northern Tarim Platform reflect the interaction of hydrothermal activity, coastal upwelling, and sea level change.

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Section: Rees Patterns and Ce Anomaliesmentioning

confidence: 98%

Reconstruction of the paleo-marine environment during the Ediacaran-Cambrian transition: new insights from geochemical proxies, northern Tarim Platform, Northwest China

Fan,

Zhu

et al. 2024

Front. Earth Sci.

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“…From the above, the ratios of Th/Sc, Th/Cr, Cr/Th and La/Sc fall within the range of felsic rock while only (Cullers, 2000), UCC (Taylor and McLennan, 1985) and PAAS (Taylor and McLennan 1985). Ganai and Rashid, (2015), had posited that sensitive diagenetical trace elements such as Zr, Hf, Nb, Y, Sc, V, Cr, Cu, Co, Ni and Zn can infer provenance and environment of deposition owing to their fairl movement during weathering, transport, diagenesis, and metamorphism. Garver et al, (1996), recommended that when Cr >150 ppm and Ni >100 ppm in abundance, they are indications of mafic or ultramafic source (Cullers 2000) and mafic rocks (Cullers, 2000), UCC (Taylor and McLennan, 1985) and PAAS (Taylor and McLennan 1985).…”

Section: Sedimentological and Geochemical Characterization Of Df-2 Well Onshore Western Niger Deltamentioning

confidence: 99%

Sedimentological and geochemical characterization of DF-2 well, Onshore Western Niger Delta: Implications for provenance, tectonic history and paleo depositional conditions

Florence¹,

Frankie²,

Kingsley³

2020

Glo Jnl Pure Appl Sci

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The sedimentology and geochemistry of the major oxides and trace elements of DF-2 well, Onshore, Niger Delta, are presented in this study. The study is aimed at describing the sedimentological characteristics as well as using the major oxides and trace elements to investigate the provenance, tectonic history and palaeo-depositional conditions of the well. Selected samples were investigated with fused bead X-Ray Fluorescence (XRF) spectrometry to determine their major oxides and fused bead laser ablation inductively couple plasma mass spectroscopy (LA-ICP-MS) for their trace elements. Sedimentological analysis from the well shows that the lithology ranged from shaly sand, sandy shale, sandstone and shale. The results show the dominance of silicon oxide (SiO2) contents which ranges from 81.1 to 91.4 wt. % (average of 87.1 wt. %). The low average concentration of Cr<150 ppm and Ni <100 ppm, the ratios of Th/Sc, Th/Co, Th/Cr, Cr/Th, La/Sc, as well as the plots of Th/Co versus La/Sc and TiO2 versus Zr, all infer a felsic source rock. The discrimination plots of ratioK2O/Na2O against SiO2 and Log K2O/Na2O against Log SiO2/Al2O3 indicated passive continental margin. Various chemical classifications of the sediments show that the sandstone facies plotted mainly in quartzarenite, sublitharenite and Fe-rich sand domains. The samples were deposited under oxic environment based on the average values of U/Th (0.26 ppm), Ni/Co (2.79 ppm) and Cu/Zn (1.81ppm) and bivariate plot of Ni/Co versus V/Cr. However, the bivariate plot of Ni/Co versus V/ (V+Ni) specifies oxic to anoxic conditions and V/Vi + Ni ratios indicate oxic, suboxic to euxinicpalaeode positional environments for the sediments. Geochemical characterization illustrates mixed marine and terrigenous source input, deposited mainly in semi humid/humid climate. The positive values attained from ratios of Al2O3/(CaO+MgO+Na2O+K2O) infers mineralogical maturity based on stable mobile oxides content in the studied samples. Keywords: Felsic Rock, Quartzarenite, Litharenite, Passive Margin, Mobile Oxide, Mature Sediments.

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“…The V/Sc ratios in the Agbada Formation sediments vary between ~1.98 and 6.72 with an average value of ~4.93, which indicates an oxic environment of deposition (Tables 3 and 4). Based on REE studies of the early Cretaceous sediments, numerous geoscientists convincingly argued that the REE patterns (including Eu* anomalies), though mostly dependent on their provenance, can also be controlled by fO 2 and sedimentary environment (Ganai and Rashid, 2015). They observed that when fO 2 is low (a reducing environment), the sediments deposited should be characterized by low REE values and a positive europium anomaly (Eu*), whereas sediments deposited in oxidizing conditions (i.e.…”

Section: Trace Element/al Ratios and Enrichmentsmentioning

confidence: 99%

“…They observed that when fO 2 is low (a reducing environment), the sediments deposited should be characterized by low REE values and a positive europium anomaly (Eu*), whereas sediments deposited in oxidizing conditions (i.e. fO 2 is high) should be characterized by high total REE and Eu depletion (Ganai and Rashid, 2015). As a result, it appears that the Agbada Formation sediments recovered from the KR-1 well, which are characterized by high total REEs and strong negative Eu anomaly, were deposited in an oxidizing environment.…”

Section: Trace Element/al Ratios and Enrichmentsmentioning

confidence: 99%

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Geochemical characterization and palynological studies of some Agbada Formation deposits of the Niger Delta basin: implications for paleodepositional environments

Adebayo¹,

Akinyemi²,

Madukwe³

et al. 2016

Turkish J Earth Sci

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Forty-two ditch cutting samples of the KR-1 offshore well from depths of 9660 ft to 10,920 ft composited at 90-ft intervals were subjected to sedimentological, micropaleontological, and geochemical analyses using standard procedures and the laser ablationinduced coupled plasma mass spectrometry technique, respectively. Sedimentological analysis revealed the presence of glauconites and the rare occurrence of framboidal pyrites, indicative of deposition in a slightly anoxic marine environment. Palynomorph percentage distribution shows that there are more terrestrially derived miospores (dominated by Zonocostites ramonae (Rhizophora spp.), Psilatricolporites crassus (Tabernaemontana crassa), Acrotichum aureum, and Laevigatosporites sp.) than marine phytoplanktons. Rare occurrence of Globoquadrina venezuelana, Globigerinoides promordius, and Globigerina sp. denotes an Early Miocene age and proximal shelf. These indicate that the main environment of deposition in the KR-1 well is coastal to marginal marine consisting of coastal deltaicinner neritic, made up of tidal channel and shoreface deposits. Geochemical results show that the average concentrations of considered rare earth elements are less than their concentrations in world average shale. Trace metal ratios (such as Th/Cr, Cr/Th, Th/Co, and Cr/ Ni) suggest that the investigated sediments were derived from felsic source rocks. Rare earth element patterns (such as La/Yb, Gd/Yb, La/Sm, and Eu/Eu) and Th data established the felsic composition of the source rocks. Ratios of U/Th, Ni/Co, Cu/Zn, and V/Sc suggest a well-oxygenated bottom water condition. Estimated europium and cerium anomalies of the studied samples suggest an oxidizing environment of deposition. Nonetheless, the ratios of V/Cr suggest a range of environmental conditions. Moreover, ratios of V/(V+Ni) suggest the rare occurrence of suboxic to anoxic environments of deposition.

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Rare earth element geochemistry of the Permo-Carboniferous clastic sedimentary rocks from the Spiti Region, Tethys Himalaya: significance of Eu and Ce anomalies

Cited by 12 publications

References 51 publications

Reconstruction of the paleo-marine environment during the Ediacaran-Cambrian transition: new insights from geochemical proxies, northern Tarim Platform, Northwest China

Reconstruction of the paleo-marine environment during the Ediacaran-Cambrian transition: new insights from geochemical proxies, northern Tarim Platform, Northwest China

Sedimentological and geochemical characterization of DF-2 well, Onshore Western Niger Delta: Implications for provenance, tectonic history and paleo depositional conditions

Geochemical characterization and palynological studies of some Agbada Formation deposits of the Niger Delta basin: implications for paleodepositional environments

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