Relevant bibliographies by topics / Deccan Traps

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Academic literature on the topic 'Deccan Traps'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Deccan Traps"

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Sheth, Hetu C. "Mahabaleshwar, Deccan Traps, India." International Journal of Earth Sciences 103, no. 3 (August 3, 2013): 799. http://dx.doi.org/10.1007/s00531-013-0943-z.

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Prasad, Guntupalli V. R. "Vertebrate biodiversity of the Deccan volcanic province of India: A review." Bulletin de la Société Géologique de France 183, no. 6 (December 1, 2012): 597–610. http://dx.doi.org/10.2113/gssgfbull.183.6.597.

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Abstract The Deccan Traps of peninsular India, representing one of the largest flood basalt eruptions on the earth's surface, have been a subject of intensive research in the last three decades because of the attributed link between the Deccan Traps and the Cretaceous-Tertiary boundary mass extinctions. In this context, the biota from the sedimentary beds intercalated with the volcanic flows and underlying the oldest volcanic flow are more important for understanding the faunal diversity and palaeobiogeography of India during the time span of volcanic eruptions. A detailed review of the vertebrate faunal diversity of the Deccan volcanic province is presented here.
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Grocholski, Brent. "Double trouble for the Deccan Traps." Science 355, no. 6325 (February 9, 2017): 591.3–591. http://dx.doi.org/10.1126/science.355.6325.591-c.

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Punnam, Pradeep Reddy, Balaji Krishnamurthy, and Vikranth Kumar Surasani. "Investigations of Structural and Residual Trapping Phenomena during CO2 Sequestration in Deccan Volcanic Province of the Saurashtra Region, Gujarat." International Journal of Chemical Engineering 2021 (July 8, 2021): 1–16. http://dx.doi.org/10.1155/2021/7762127.

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This work aims to study the structural and residual trapping mechanisms on the Deccan traps topography to elucidate the possible implementation of CO2 geological sequestration. This study provides an insight into a selection of stairsteps landscape from Deccan traps in the Saurashtra region, Gujarat, India. Various parameters affect the efficiency of the structural and residual trapping mechanisms. Thus, the parametric study is conducted on the modeled synthetic geological domain by considering the suitable injection points for varying injection rates and petrophysical properties. The outcomes of this study will provide insights into the dependencies of structural and residual trapping on the Deccan traps surface topography and injection rates. It can also establish a protocol for selecting the optimal injection points with the desired injection rate for the safe and efficient implementation of CO2 sequestration. The simulation results of this study have shown the dependencies of structural and residual trapping on the geological domain parameters.
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Hernandez Nava, Andres, Benjamin A. Black, Sally A. Gibson, Robert J. Bodnar, Paul R. Renne, and Loÿc Vanderkluysen. "Reconciling early Deccan Traps CO2 outgassing and pre-KPB global climate." Proceedings of the National Academy of Sciences 118, no. 14 (March 29, 2021): e2007797118. http://dx.doi.org/10.1073/pnas.2007797118.

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A 2 to 4 °C warming episode, known as the Latest Maastrichtian warming event (LMWE), preceded the Cretaceous–Paleogene boundary (KPB) mass extinction at 66.05 ± 0.08 Ma and has been linked with the onset of voluminous Deccan Traps volcanism. Here, we use direct measurements of melt-inclusion CO2 concentrations and trace-element proxies for CO2 to test the hypothesis that early Deccan magmatism triggered this warming interval. We report CO2 concentrations from NanoSIMS and Raman spectroscopic analyses of melt-inclusion glass and vapor bubbles hosted in magnesian olivines from pre-KPB Deccan primitive basalts. Reconstructed melt-inclusion CO2 concentrations range up to 0.23 to 1.2 wt% CO2 for lavas from the Saurashtra Peninsula and the Thakurvadi Formation in the Western Ghats region. Trace-element proxies for CO2 concentration (Ba and Nb) yield estimates of initial melt concentrations of 0.4 to 1.3 wt% CO2 prior to degassing. Our data imply carbon saturation and degassing of Deccan magmas initiated at high pressures near the Moho or in the lower crust. Furthermore, we find that the earliest Deccan magmas were more CO2 rich, which we hypothesize facilitated more efficient flushing and outgassing from intrusive magmas. Based on carbon cycle modeling and estimates of preserved lava volumes for pre-KPB lavas, we find that volcanic CO2 outgassing alone remains insufficient to account for the magnitude of the observed latest Maastrichtian warming. However, accounting for intrusive outgassing can reconcile early carbon-rich Deccan Traps outgassing with observed changes in climate and atmospheric pCO2.
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Ottens, Berthold. "Calcite from the Deccan: Traps of India." Rocks & Minerals 80, no. 2 (March 2005): 94–107. http://dx.doi.org/10.3200/rmin.80.2.94-107.

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Wigginton, N. S. "Dating the influence of Deccan Traps eruptions." Science 347, no. 6218 (January 8, 2015): 141. http://dx.doi.org/10.1126/science.347.6218.141-b.

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Rocchia, R., D. Boclet, V. Courtillot, and J. J. Jaeger. "A search for iridium in the Deccan Traps and Inter-Traps." Geophysical Research Letters 15, no. 8 (August 1988): 812–15. http://dx.doi.org/10.1029/gl015i008p00812.

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Radhakrishnamurty, C., and K. V. Subbarao. "Palaeomagnetism and rock magnetism of the Deccan traps." Journal of Earth System Science 99, no. 4 (December 1990): 669–80. http://dx.doi.org/10.1007/bf02840321.

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O’Connor, Liam, Dawid Szymanowski, Michael P. Eddy, Kyle M. Samperton, and Blair Schoene. "A red bole zircon record of cryptic silicic volcanism in the Deccan Traps, India." Geology 50, no. 4 (January 5, 2022): 460–64. http://dx.doi.org/10.1130/g49613.1.

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Abstract Silicic magmas within large igneous provinces (LIPs) are understudied relative to volumetrically dominant mafic magmas despite their prevalence and possible contribution to LIP-induced environmental degradation. In the 66 Ma Deccan LIP (India), evolved magmatism is documented, but its geographic distribution, duration, and significance remain poorly understood. Zircons deposited in weathered Deccan lava flow tops (“red boles”) offer a means of indirectly studying potentially widespread, silicic, explosive volcanism spanning the entire period of flood basalt eruptions. We explored this record through analysis of trace elements and Hf isotopes in zircon crystals previously dated by U–Pb geochronology. Our results show that zircon populations within individual red boles fingerprint distinct volcanic sources that likely developed in an intraplate setting on cratonic Indian lithosphere. However, our red bole zircon geochemical and isotopic characteristics do not match those from previously studied silicic magmatic centers, indicating that they must derive from yet undiscovered or understudied volcanic centers associated with the Deccan LIP.
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Dissertations / Theses on the topic "Deccan Traps"

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Cohen, Tobi Helene. "An experimental petrologic and geochemical study of Deccan trap basalts : part I, Deccan traps from Tamia, central India ; part II, crystallization relationships of Deccan basalts at 6.35 kbars." FIU Digital Commons, 1989. http://digitalcommons.fiu.edu/etd/2396.

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New major, minor, and trace element data for the Chakhla- Delakari sill and three nearby lava flows in the proximal area of Tamia are presented. Based on abundances of trace elements, it is inferred that the sill was the feeder of the two uppermost lava flows which tapped magmas from a LREE-, Rb-enriched source. The oldest (lowermost) flow shows greater affinity with the western Deccan lavas. The association of the feeder sill with a large network of parallel trending sills and dikes, and the elongate Satpura Dome, is taken to infer that a major locus of eruption of the Deccan Trap lavas existed in the eastern part of the province. A model is presented for the evolution of the magma source of the sill and the two uppermost flows in a chamber beneath the Satpura Dome in the easternmost Deccan Traps. Results of equilibrium crystallization experiments at 6.35 kbars conducted on two compositions which represent probable near primary liquids are presented. One of these starting compositions has 9.5% MgO and the other 13% MgO. The sequence of crystallization in both starting liquids at 6.35 kbars is as follows: olivine; olivine + Ca- clinopyroxene; ol + Ca-clinopyroxene + Ca-poor clinopyroxene; olivine + Ca-clinopyroxene + Ca-poor clinopyroxene + plagioclase. Based on the present experimental data, it is inferred that typical Deccan magmas (MgO 5-9%) are produced by early fractionation of olivine, pyroxene (Ca-augite and pigeonite), and late fractionation of plagioclase. Deccan basalts with MgO 9-10% appear to have crystallized from melts lower in Ti02 than the starting materials of this study which fractionated olivine and plagioclase. Basalts with MgO2source which has fractionated olivine and plagioclase will produce of the bulk of Deccan basalts.
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Chenet, Anne-Lise. "Reconstruction de la séquence éruptive des Traps du Deccan, Inde : conséquences climatiques et environnementales." Paris, Institut de physique du globe, 2006. http://www.theses.fr/2006GLOB0015.

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Dans cette thèse, nous tentons de contraindre la date, la séquence et la durée du volcanisme des traps du Deccan en Inde, et de commencer à en modéliser les conséquences climatiques. Pour cela, nous avons échantillonné 12 nouvelles coupes sur 300km (du Nord au Sud) le long de l’escarpement des Western Ghats. Les résultats paléomagnétiques ont permis de reconnaître des groupes de directions statistiquement identiques dans de nombreuses coulées, soit situées en séquence dans une même coupe, soit séparées latéralement de plus de 130km. Nous proposons, sur la base des caractéristiques de la variation séculaire récente du champ géomagnétique et de la taille des intervalles de confiance à 95% des directions rémanentes, que ces groupes directionnels correspondent à des méga-coulées ou “unités de refroidissement” qui se sont refroidies en quelques décennies à moins d’un siècle. Ces méga-coulées sont alors capables d’émettre de fortes quantités de dioxyde de soufre dans l’atmosphère. Nous estimons la durée totale de mise en place du volcanisme (le temps réel d’éruption) à moins de 10. 000 ans, la plupart du temps (de 400 à 500. 000 ans) étant représentée par une dizaine de “red boles” épais. Les données géochronologiques ont permis d’obtenir pour les Western Ghats un âge absolu (64. 7±0. 6Ma; 1s) qui est statistiquement identique à celui de la limite Crétacé-Tertiaire (qui ne peut cependant pas encore être localisée avec précision dans la coupe). Pour tenter de commencer à modéliser l’impact climatique d’un grand trap, nous avons choisi comme “brique élémentaire” l’éruption fissurale de 1783 au Laki en Islande (l’une des plus grandes éruptions historiques basaltiques). Avec le modèle LMDZ-INCA, nous avons pu reproduire l’extension (semi-globale) du nuage de brouillards exceptionnels qui fut observé cette année-là, et nous avons pu nous faire une idée des raisons de la crise de mortalité qui l’a accompagné. Un seul “pulse” du Deccan pouvant atteindre dix fois le flux injecté par le Laki et ce pendant près de 100 fois plus longtemps, les traps du Deccan sont alors fortement susceptibles d’induire une extinction en masse
In this thesis, we attempt to constrain the date, timing and duration of flood basalt volcanism in the particular case of the Deccan traps of India, and to model the climatic impact of such massive volcanism. With this goal in mind, we have sampled 12 new sections of the traps along 300km (from North to South) of the Western Ghat escarpment. Sections were selected based on previously available petrologic, geochemical and volcanological data. Using the paleomagnetic analysis we have been able to recognize groups of statistically identical directions in a number of flows, either superimposed in the same section, or laterally separated by up to 130km. We hypothesize, based on the characteristics of recent secular variation and the typical sizes of the 95% confidence intervals of the remanence directions, that these directional groups represent mega-flows or cooling units that cooled within a period of decades to at most a century. We estimate that the total amount of time represented by the flows could be less than 10,000 years, and that most of the time (400 to 500. 000 years) is represented by less than 10 thick bole levels. Therefore we have established an absolute age undistinguishable from that of the Cretaceous-Tertiary boundary (although this boundary cannot yet be precisely located within the section) at 64. 7±0. 6Ma. In order to start modeling the climatic impact of such flood basalt sequences, we have first used as a “building block” the 1783 fissure eruption at Laki in Iceland (one of the largest historical basaltic eruptions). Using the LMDZ-INCA model, we replicate the observed (semi-global) dispersal over much of northern hemisphere of the unusual haze that was observed at the time and are able to understand the spread and intensity of the mortality crisis which ensued. A single Deccan pulse could have reached 10 times the flux of Laki, and for up to 100 times longer. And there were tens of pulses suggesting the causal consequences of the climatic impact of flood basalts regarding mass extinctions
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James, Sarah Louise. "The geochemistry of secondary zeolites from tertiary basaltic terrains." Thesis, Royal Holloway, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325118.

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Mitchell, Clive J. "Petrology and geochemistry of basaltic rocks of the Falkland Islands and Deccan Traps (India)." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670335.

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Gangopadhyay, Amitava. "An experimental petrologic study of basalts from selected formations of the deccan traps, India." FIU Digital Commons, 1999. http://digitalcommons.fiu.edu/etd/3450.

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Crystallization experiments were performed at one-atmosphere pressure and Quartz- Fayalite-Magnetite (QFM) buffer conditions on tholeiitic basalts from Ambenali and Bushe formations of the Deccan Traps. The sequence and chemistry of the experimentally produced phase assernblages are in general agreement with the observed petrographic and geochemical variation of the natural Ambenali samples. When Bushe and Ambenali basalts are plotted on a cpx-ol-qz diagram, Ambenali plots close to the ol+aug+pl+l pseudo-cotectic whereas Bushe basalts define the pigeonite liquidus field which is somewhat different from that inferred by Grove and Bryan (1983) for midoceanic ridge basalts (MORBs). The difference can be ascribed to the different bulk composition of the starting materials used in the present experiments. Although ol → ol+ aug are near liquidus assemblages in the experiments on Neral at QFM, natural samples from this formation are rnostly aphyric. This may indicate that (1) the within-chamber crystal sorting processes were extremely efficient so that the crystals were totally removed from the melt prior to their eruption, or (2) the lavas erupted at super-liquidus temperatures (i.e., carried superheat).
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Hofmann, Corine. "Datation #4#0Ar/#3#9Ar et paléomagnétisme des Traps d'Ethiopie, du Deccan et de Sibérie." Paris, Institut de physique du globe, 1997. http://www.theses.fr/1997GLOB0001.

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La datation #4#0ar/#3#9ar et le paleomagnetisme sont deux methodes puissantes pour contraindre la duree d'emission des principaux traps. Nos resultats sur trois d'entre eux plaident en faveur d'une mise en place rapide, et une association possible (au moins temporelle) a des evenements biologiques ou climatiques majeurs. Les traps du deccan ont deja fait l'objet de nombreux travaux, mais les interpretations continuent a differer. Ainsi, courtillot et al. (1988) proposent une duree d'epanchement courte (moins d'1ma), principalement durant le chron 29r et un lien probable avec les extinctions de la limite cretace-tertiaire. Venkatesan et al. (1993) plaident en faveur d'une duree d'epanchement superieure a 3ma, associent les traps au chron 31r niant tout lien possible avec la limite kt. La decouverte par bhandari et al. (1994) d'un niveau d'iridium entre deux coulees de traps dans la province du kutch a offert l'opportunite de confirmer la simultaneite des deux evenements, impact et volcanisme. Nos resultats confirment que le volcanisme a commence avant la kt, chevauche la limite et continue apres. L'impact n'a donc pas cause l'epanchement des traps. Les deux catastrophes ont pu jouer un role dans les extinctions de la kt, dont le taux respectif reste a preciser. Nos resultats sur les traps de siberie concernent une aire plus vaste que celle des intrusions de noril'sk-1 abondamment etudiee, et nos ages semblent confirmer une mise en place rapide contemporaine de la limite permo-trias. L'age des traps d'ethiopie etait encore mal contraint au debut de ce travail. Nous pouvons aujourd'hui proposer un age de 30ma. Les ages obtenus dans une coupe de 2200m d'epaisseur sont indiscernables les uns des autres autour de cette valeur. Les magnetostratigraphies obtenues ne peuvent etre correlees de maniere unique mais confirment la brievete de l'epanchement. La regression majeure des niveaux marins vers 28. 5ma (haq et al. , 1987) pourrait lui etre attribue.
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Jay, Anne E. "Volcanic architecture of the Deccan Traps, western Maharashtra, India : an integrated chemostratigraphic and paleomagnetic study." Thesis, Open University, 2005. http://oro.open.ac.uk/41266/.

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Detailed volcanostratigraphic logs of seven traverses up the lava sequence in the Western Ghats, Deccan Traps, India, are presented. The main study area, the Mahabaleshwar Plateau, was chosen because the lavas were emplaced around the time of the Cretaceous-Tertiary Boundary and because there is access to exposed lavas on three of its four sides, permitting investigation of the volcanic architecture in 3-D. Besides characteristics of the lava units, the logs include integrated geochemical and palaeomagnetic samples. The lava pile is dominated by pthoehoe sheet lobes and smaller lobes and toes. It can be divided into flow-fields, the products of one eruption, by the occurrence of weathering horizons. Palaeomagnetic results demonstrate that the chron 29R/29N reversal boundary horizon occurs in all four of the traverses around the Plateau and nearby Khumbarli Ghat. The elevation of the reversal horizon on each traverse varies between 897-945 m and 982 m, a value greater than that predicted by the small regional dip. Statistical analysis of geochemical data from samples taken between the reversal horizon and the base of the Mahabaleshwar Formation do not show any apparent correlation around the Mahabaleshwar Plateau, indicating that individual sheet lobes are less than 20 km wide. Determining the lateral extent of flow-fields is not possible using this method but from the occurrence of a similar number of flow-fields in three traverses of similar length round the Plateau, it is probable that most flow fields are at least as wide as the Mahabaleshwar Plateau (more than 20 km). Comparing the thickness of the lava pile between the base of the Mahabaleshwar Formation, the palaeomagnetic reversal horizon and the laterite cap, shows that as much as 95m of topography occurred on the surface of the active Deccan lavas over a distance of approximately 20 km. The volcanic architecture is controlled by the morphology of small sheet lobes, large sheet lobes, and, on a larger scale, flow-fields. These observations, and the varying number of individual sheet lobes making up flow-fields, demonstrates that the structure of the Deccan lava province at the level of eruptive units is extremely complex.
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Borges, Melroy R. "Life Cycle of Deccan Trap Magma Chambers: A Crystal Scale Elemental and Strontium Isotopic Investigation." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/10.

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The Deccan Trap basalts are the remnants of a massive series of lava flows that erupted at the K/T boundary and covered 1-2 million km2 of west-central India. This eruptive event is of global interest because of its possible link to the major mass extinction event, and there is much debate about the duration of this massive volcanic event. In contrast to isotopic or paleomagnetic dating methods, I explore an alternative approach to determine the lifecycle of the magma chambers that supplied the lavas, and extend the concept to obtain a tighter constraint on Deccan’s duration. My method relies on extracting time information from elemental and isotopic diffusion across zone boundary in an individual crystal. I determined elemental and Sr-isotopic variations across abnormally large (2-5 cm) plagioclase crystals from the Thalghat and Kashele “Giant Plagioclase Basalts” from the lowermost Jawhar and Igatpuri Formations respectively in the thickest Western Ghats section near Mumbai. I also obtained bulk rock major, trace and rare earth element chemistry of each lava flow from the two formations. Thalghat flows contain only 12% zoned crystals, with 87Sr/86Sr ratios of 0.7096 in the core and 0.7106 in the rim, separated by a sharp boundary. In contrast, all Kashele crystals have a wider range of 87Sr/86Sr values, with multiple zones. Geochemical modeling of the data suggests that the two types of crystals grew in distinct magmatic environments. Modeling intracrystalline diffusive equilibration between the core and rim of Thalghat crystals led me to obtain a crystal growth rate of 2.03x10-10 cm/s and a residence time of 780 years for the crystals in the magma chamber(s). Employing some assumptions based on field and geochronologic evidence, I extrapolated this residence time to the entire Western Ghats and obtained an estimate of 25,000 – 35,000 years for the duration of Western Ghats volcanism. This gave an eruptive rate of 30 – 40 km3/yr, which is much higher than any presently erupting volcano. This result will remain speculative until a similarly detailed analytical-modeling study is performed for the rest of the Western Ghats formations.
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Parisio, Laura. "VOLCANISM AND INTRUSIONS OF THE DECCAN TRAPS, INDIA: GEOCHEMISTRY AND GEOCHRONOLOGY OF THE MAGMATIC ROCKS AND PALEOENVIRONMENTAL CONSEQUENCES." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423742.

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The Deccan Traps are one of the most important Large Igneous Provinces (LIP) in the world, they are mainly constituted by tholeiitic lava flows, now covering almost one sixth of the Indian continent, and reaching the maximum exposed thickness of 1300 m. The emplacement of such quantities of magma and its timing (ca. 66Ma) close to the Cretaceous-Paleogene (K-Pg) boundary, have led several authors to propose a causal link between the formation of the province and the K-Pg boundary mass extinction . Moreover, a distinctive feature of the province is the presence, beside the tholeiites, of several alkaline bodies, associated with the main fault zones of India. These two important aspects of the Deccan Traps have been investigated in the northern portion of the province by sampling both alkaline and tholeiitic rocks, in order to provide precise timing of emplacement and to constrain the relationship between them through the definition of their mantle source. 40Ar/39Ar step-heating analyses provided two different age peaks that straddle the K-Pg boundary, one with an age comparable with the main phase of Deccan volcanism (ca 66.5 Ma), the other slightly younger (ca. 65.2 Ma), thus confirming the synchrony between the emplacement of the province and the end-Cretaceous mass extinction. Therefore, the input in the atmosphere of huge quantities of gas, produced by the emplacement of the Deccan Traps, could have contributed to the extinction. In particular a crucial role may be provided in this sense by the alkaline magmas, which are likely enriched in volatile elements. Whole rock analyses showed that the samples span a wide compositional range varying from little-evolved compositions such as picro-basalts to fairly evolved ones such as rhyolite; the large variation is observed in the total alkali content (Na2O+K2O) as well, ranging from the subalakaline basalt field, up to strongly alkaline samples like phonolites. Alkaline rocks appear enriched in the most incompatible elements and present higher La/Yb ratios (19.5-68.8). They are also characterized by negative K anomaly (possibly suggesting the presence of a K-rich residual mantle mineral), and Pb spikes; on average they present patterns similar to those displayed by other alkaline rocks of the Deccan Traps, thus suggesting analogous origin and source. Sr-Nd isotopes define a large spectrum of compositions, departing from a similar depleted end-member (εNdt ca. +3 and 87Sr/86Srt ca. 0.705) and trending towards low εNdt and relatively low 87Sr/86Srt (-12.96 and 0.71061, respectively), and toward very high 87Sr/86Srt (0.72788) and low εNdt (-12.50). The trend with higher 87Sr/86Srt has been interpreted as the result of Assimilation- Fractional Crystallization (AFC) process, starting from a magma similar to Réunion OIBs or Central Indian Ridge basalts progressively contaminated by rocks from the Indian cratons (Dharwar and Aravalli cratons). The trend towards low εNdt and relatively low 87Sr/86Srt is defined mainly by mafic sulbalkaline rocks from the Phenai Mata intrusion. These rocks are characterized also by very high 207Pb/204Pbt and 208Pb/204Pbt ratios. Given the preliminary 187Os/188Ost compositions (0.1584 to 0.2457), mafic subalkaline rocks assimilated only negligible amounts of crust. Their enriched Sr-Nd-Pb isotopic composition is thus best interpreted as resulting from recycling of ancient sediments in their mantle source. On the contrary, alkaline samples present quite homogeneous isotopic compositions, slightly more enriched than that of nearby carbonatite complexes (e.g. Amba Dongar) and substantially more enriched than Reunion basalts. Therefore, the alkaline rocks are unlikey a product of the Reunion mantle plume, but more probably of the subcontinental lithospheric mantle, as is consistent also with their incompatible trace element contents and patterns.
I Deccan Traps sono una delle più importanti grandi province magmatiche del mondo, sono principalmente costituiti da colate di lava tholeiitica, attualmente ricoprono circa un sesto del continente Indiano e raggiungono uno spessore massimo di 1300m. La messa in posto di queste grandi quantità di magma avvenuta al limite Cretaceo-Paleogene (K-Pg), ha portato diversi autori a proporre un rapporto di causalità tra la formazione di questa provincia e l’estinzione di massa al limite K-Pg. Inoltre, una caratteristica dei Deccan Traps è la presenza, oltre alle tholeiiti, di diversi corpi alcalini associati con le principali zone di faglia indiane. Questi due importanti aspetti dei Deccan traps sono stati studiati nella porzione nordoccidentale della provincia, campionando rocce alcaline e tholeiitiche, al fine di definire un preciso tempo di messa in posto e caratterizzare la relazione tra le diverse litologie, attraverso la determinazione della loro sorgente di mantello. Le analisi 40Ar/39Ar step-heating hanno restituito due diversi picchi di età a cavallo del limite K-Pg, il primo con un’età comparabile a quella della fase principale del magmatismo Deccan (ca. 66.5Ma), il secondo più giovane (ca. 65.2 Ma), confermando quindi l’effettiva sincronia tra la formazione della provincia e l’estinzione di massa alla fine del Cretaceo. Quindi, l’immissione in atmosfera di grandi quantità di gas, prodotta dalla messa in posto dei Deccan Traps, può aver contribuito all’estinzione. In particolare un ruolo molto importante potrebbe essere stato quello dei magmi alcalini, che verosimilmente sono arricchiti in elementi volatili. I campioni coprono un ampio range composizionale in termini di elementi maggiori, variando da composizioni poco evolute come i picro-basalti, a evolute come le rioliti; la variabilità è osservata anche nel contenuto di alcali (Na2O+K2O), variando dal campo subalcalino dei basalti a quello di campioni fortemente alcalini come le fonoliti. Le rocce alcaline sono arricchite negli elementi più incompatibili e presentano un rapporto La/Yb più alto (19.5-68.8). sono inoltre caratterizzate da una anomalia negativa in K, (probabilmente dovuta alla presenza di una fase residuale ricca in K nel mantello) e ad una positiva in Pb; in genere presentano pattern simili a quelli di altre rocce alcaline dei Deccan Traps, suggerendo quindi un’origine simile. Anche i rapporti isotopici di Sr e Nd definiscono un ampio range composizionale, partendo da un end-member impoverito (εNdt ca. +3 and 87Sr/86Srt ca. 0.705), verso composizioni a basso εNdt e relativamente basso 87Sr/86Srt (-12.96 and 0.71061, rispettivamente), e verso composizioni a 87Sr/86Srt (0.72788) molto alto e basso εNdt (-12.50). Il trend a più alto 87Sr/86Srt è stato interpretato come il risultato di un processo di assimilazione e cristallizzazione frazionata (AFC), a partire da un magma simile alle composizioni tipiche di Réunion o del Central Indian Ridge, progressivamente contaminato da rocce dei Cratoni indiani (Dharwar e Aravalli). Il trend verso composizioni a basso εNdt e relativamente basso 87Sr/86Srt è definito principalmente da rocce mafiche subalcaline dell’intrusione di Phenai Mata, queste rocce sono anche caratterizzate da rapporti 207Pb/204Pbt and 208Pb/204Pbt molto alti. Date le prime composizioni isotopiche 187Os/188Ost (da 0.1584 a 0.2457), queste rocce hanno assimilato porzioni trascurabili di crosta. Le loro composizioni Sr-Nd-Pb arricchite sono quindi meglio interpretate come il risultato del contributo nella sorgente di mantello di antichi sedimenti riciclati. Al contrario i campioni alcalini presentano composizioni isotopiche piuttosto omogene, leggermente più arricchite rispetto a quelle dei vicini complessi carbonatitici (p. es. Amba Dongar) e decisamente più arricchiti dei basalti di Réunion. Perciò le rocce alcaline sembrano non essere il prodotto del plume di Réunion, ma più probabilmente del mantello litosferico subcontinentale, come suggerito anche dai contenuti e dai pattern degli elementi in traccia.
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Malamoud, Karim. "Des trapps du Deccan à la Réunion : couplage de données géochimiques pétrologiques et paléomagnétiques. Conséquences géodynamiques à la limite crétacé-paléocène." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU055/document.

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Cette thèse s'appuie sur les travaux d'Alexander V. Sobolev sur le recyclage de matériel crustal dans le manteau terrestre en lien avec les processus de mise en place des provinces magmatiques et des iles océaniques. Il s'agit d'utiliser des outils pétrologiques et géochimiques couplés à des données de paléomagnétisme haute résolution, et à de la modélisation thermomécanique dans le but de contraindre les processus profonds à l'origine des Trapps du Deccan et leurs conséquences au niveau planétaire (extinction de masse). Dans un premier temps, cette thèse propose une réinterprétation des diverses contraintes temporelles sur la durée de l'éruption des Trapps du Deccan (datations radiochronologiques, paleomagnétisme, profiles d'altérations, et données paléo-environnementales) et suggère un scénario temporel pour la mise en place de cette province magmatique, le tout principalement basé sur des données paléomagnétiques de hautes résolution de Chenet et al (2008, 2009). Ce scénario implique que la phase principale de l'éruption des Trapps du Deccan s'est produite peu de temps avant la limite Crétacé-Paléogène et qu'elle correspond à la mise en place d'environ 1.106km3 de laves en 50ka. Ces chiffres sont équivalents à 150-200 fois le taux d'éruption actuel de l'ile volcanique d'Hawaii. Ce scénario temporel a ensuite été couplé à des données géochimiques élémentaires qui ont permis de mettre en évidence 1) une origine profonde pour la grande majorité des liquides primaires et 2) d'importantes variations de l'assimilation crustale au cours du temps, notamment juste avant la limite Crétacé-Paléogène. Ces phénomènes sont compatibles avec un unique épisode d'érosion lithosphérique de la plaque indienne par les processus magmatiques dans le manteau sous-jacent. Les données relatives aux Trapps du Deccan peuvent être comparées à celles des Trapps de Sibérie et révèlent notamment que l'importante érosion lithosphérique identifiée dans celles-ci n'ait pas eu lieu dans le cas des Trapps du Deccan malgré des caractéristiques mantelliques similaires. Cette différence peut être attribuée à la plus grande épaisseur de la plaque indienne, ainsi qu'à l'existence de zones de faiblesses, liées à l'héritage tectonique du bouclier indien. Ces zones de faiblesses auraient facilité le passage des magmas à travers la plaque de manière à ce qu'une faible proportion d'entre eux seulement ait été impliquée dans les processus de délamination lithospherique. Un ensemble de données géochimiques sur olivine ainsi que de modélisation des liquides magmatiques primaires et de leur source pour les Trapps du Deccan nous ont permis de montrer 1) l'importante contribution d'une source pyroxenitique à la composition des liquide magmatiques primaires (65%), 2) que la gamme de températures potentielles de ces mêmes sources avait due être de l'ordre de 1600°C et 3) que ces dernières contenaient environ 15% de matériel crustal recyclé. Des mesures et calculs similaires appliquées aux laves de la Réunion ont, par ailleurs, montrés des résultats très différents : 50% de liquides pyroxenitiques dans les liquides magmatiques primaires, une température potentielle mantellique de l'ordre de 1500°C et une teneur des sources magmatiques en matériel crustal recyclé de l'ordre de 7%. Ces résultats sont compatibles avec le modèle de panache matellique pour la mise en place des provinces magmatiques et des iles océaniques ainsi qu'avec l'hypothèse du refroidissement séculaire de ces mêmes panaches. Nous en concluons que l'éruption des Trapps du Deccan fut un événement d'une rapidité exceptionnelle et que son implication dans la crise biologique de la fin du Crétacé fut sans doute particulièrement importante
This PhD aims to build on the previous work by Alexander V. Sobolev and colleagues on crustal recycling within the Earth mantle and LIPs/ocean island magmatism. The PhD focus will be to apply petrology and geochemistry coupled with high-resolution paleomagnetism, and thermo-mechanical modelling in order to constrain the deep processes behind the Deccan Traps (mantle melting and crustal recycling) as well as the consequences at the surface of the Earth (eruption rates and related degassing). Upon revisiting published time constraints on the Deccan eruptions (radiometric dating, paleomagnetism, inter-flow weathering profiles and paleoenvironmental data), we propose a new, paleomagnetism-based (Chenet et al., 2008, 2009), eruption scenario for the Main Deccan Province (Western Ghats). We suggest that the main phase of volcanic activity occurred just before and ended at the Cretaceous-Palaeogene boundary and was responsible for the emplacement of about 1.106km3 of lavas in ~50kyr. This is equivalent to 150 to 200 times present-day eruption rates in Hawaii. Coupling of the paleomagnetism-based timeframe with bulk-rock trace element concentrations revealed that Western Ghats lavas feature 1) a strong garnet signature (Heavy Rare Earth Element depletion), indicative of a deep origin and 2) significant temporal variations in the intensity of crustal assimilation undergone by the rising melts, especially just before the Cretaceous-Palaeogene boundary. We suggest that these excursions are part of a single and localized plume-induced lithospheric erosion event of the Indian lithosphere by the Deccan plume. A comparison of the Deccan Traps with the Siberian Traps exposes significant geodynamical differences. Most notably, the widespread and extensive lithospheric erosion observed in the Siberian Traps did not take place in the Deccan Traps, despite similar mantle characteristics. This difference is attributed to 1) a thicker Indian lithosphere and 2) to the existence of weaknesses in the form of pre-existing structural lineaments. These pre-existing structures facilitated the passage of deep mantle-derived magmas and thus precluded or limited their involvement in a freezing-delamination process. Olivine geochemistry and olivine-based primary melt and source modelling in Deccan Traps lavas showed 1) large contributions of pyroxenite-derived melts (65%) to the primary melts, 2) high potential temperatures of the mantle sources (~1590-1600°C) and 3) that the mantle sources of Deccan Traps magmas contained ~15% of recycled crustal material. These observations contrast with those obtained from Réunion Island lavas (50% of pyroxenite-derived melts, mantle potential temperatures of 1490-1500°C and 7% of recycled crustal material in the sources of Réunion Island magmas. Our results are compatible with the plume model for LIPs and ocean island magmatism as well as with a secular cooling of mantle plumes. We conclude, along with many authors, that the emplacement of the Deccan Traps was a remarkably swift and catastrophic event at the end of the Cretaceous and that it likely played a significant role in the end-Cretaceous mass extinction
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Books on the topic "Deccan Traps"

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India, Geological Survey of, ed. Annals of Deccan traps study and bibliography on Deccan traps. Calcutta: Geological Survey of India, 1996.

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Ottens, Berthold. Minerals of the Deccan Traps, India. Tucson: Mineralogical Record Inc., 2003.

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India, Geological Survey of, ed. Deccan flood basalt: A pictorial atlas = Dakshiṇī plāvana vôsālṭa : eka sacitra eṭalasa. Calcutta: Geological Survey of India, 1996.

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Sandler, Corey. Official Sega Genesis and Game Gear strategies, 3RD Edition. New York: Bantam Books, 1992.

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Tom, Badgett, ed. Official Sega Genesis and Game Gear strategies, 2ND Edition. Toronto: Bantam Books, 1991.

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La normalización de la contabilidad pública española: Una visión crítica tras cuatro décadas de reformas, discurso leído el día 29 de octubre de 2015 en su recepción como académico de número por el Ilm. Sr. D. José Manuel Vela Bargues y contestación del académico de número y decano de la Real Acadèmia de Cultura Valenciana, Ilmo. Sr. D. Enrique de Miguel Fernández-Carranza. Real Academia de Cultura Valenciana, 2015.

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Official Sega Genesis and Game Gear Strategies, '94 Edition. New York, NY: Random House, Electronic Publishing, 1993.

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Book chapters on the topic "Deccan Traps"

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Mahoney, John J. "Deccan Traps." In Petrology and Structural Geology, 151–94. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-015-7805-9_5.

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Kale, Vishwas S. "The Laterite-Capped Panchgani Tableland, Deccan Traps." In World Geomorphological Landscapes, 217–22. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8029-2_23.

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Sen, Gautam. "Large Igneous Provinces: Deccan Traps and Columbia River Basalts." In Petrology, 189–207. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38800-2_9.

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Kale, Vivek S. "Cretaceous Volcanism in Peninsular India: Rajmahal–Sylhet and Deccan Traps." In Geodynamics of the Indian Plate, 233–89. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-15989-4_8.

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Sen, Gautam, and D. Chandrasekharam. "Deccan Traps Flood Basalt Province: An Evaluation of the Thermochemical Plume Model." In Topics in Igneous Petrology, 29–53. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9600-5_2.

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Hari, K. R., and Vikas Swarnkar. "Petrogenesis of Basaltic and Doleritic Dykes from Kawant, Chhotaudepur Province, Deccan Traps." In Dyke Swarms:Keys for Geodynamic Interpretation, 283–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-12496-9_17.

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Kaila, K. L., I. B. P. Rao, P. Koteswara Rao, N. Madhava Rao, V. G. Krishna, and A. R. Sridhar. "DSS studies over Deccan Traps along the Thuadara-Sendhwa-Sindad Profile, across Narmada-Son Lineament, India." In Properties and Processes of Earth' Lower Crust, 127–41. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/gm051p0127.

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Arndt, Nicholas. "Deccan Trapps." In Encyclopedia of Astrobiology, 617. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_399.

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Arndt, Nicholas. "Deccan Trapps." In Encyclopedia of Astrobiology, 414. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_399.

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Arndt, Nicholas, and Daniele L. Pinti. "Deccan Trapps." In Encyclopedia of Astrobiology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-642-27833-4_399-4.

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Conference papers on the topic "Deccan Traps"

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Endalu Tadele Chala, K. Seshagiri Rao, Swapnil Mishra, and Ankesh Kumar. "Geomechanical properties of volcanic rocks from Deccan Traps." In VII Simpósio Brasileiro de Mecânica das Rochas. São Paulo, SP, Brasil: Associação Brasileira de Mecânica dos Solos e Engenharia Geotécnica - ABMS, 2016. http://dx.doi.org/10.20906/cps/sbmr-02-0005.

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Renne, Paul, Andrew Tholt, Kanchan Pande, Courtney Sprain, Loyc Vanderkluysen, Stephen Self, Isabel Fendley, and Andrea Marzoli. "Spatial-Temporal Evolution of the Deccan Traps Volcanic System." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2193.

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Mittal, Tushar, Mark Richards, and Noah Randolph-Flagg. "Magmatic Architecture of Continental Flood Basalts – A Deccan Traps Perspective." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1817.

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Halder, Mahesh, Debajyoti Paul, and Andreas Stracke. "Petrogenesis of Girnar Volcano-Plutonic Complex in Deccan Traps, India." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.927.

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Fendley, Isabel, Nicole Mizrahi, Tushar Mittal, Courtney Sprain, Paul Renne, and Stephen Self. "Assessing the Significance of Sulfate Driven Cooling for the Deccan Traps." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.701.

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Hernandez Nava, Andres, Benjamin A. Black, and Sally Gibson. "SOURCES OF EARLY DECCAN TRAPS MAGMAS AND IMPLICATIONS FOR VOLATILE EVOLUTION." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-358263.

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Adatte, Thierry. "Multiproxy Evidence of Main Deccan Traps Pulse near the Cretaceous-Tertiary Boundary." In Proceedings of XXIII Indian Colloquium on Micropaleontalogy and Stratigraphy and International Symposium on Global Bioevents in Earth's History. Geological Society of India, 2015. http://dx.doi.org/10.17491/cgsi/2013/63309.

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Eddy, Michael P., Blair Schoene, Blair Schoene, Kyle Michael Samperton, Kyle Michael Samperton, Gerta Keller, Gerta Keller, et al. "U-PB ZIRCON GEOCHRONOLOGY OF THE SOUTHERN MALWA PLATEAU BASALT: DECCAN TRAPS, INDIA." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-336734.

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Petersen, Sierra V., Andrea Dutton, and Kyger C. Lohmann. "CLIMATIC IMPACTS OF DECCAN TRAPS VOLCANISM RECORDED IN MOLLUSK SHELLS FROM SEYMOUR ISLAND, ANTARCTICA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-281455.

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Schoene, Blair, Kyle Michael Samperton, Michael P. Eddy, Gerta Keller, Thierry Adatte, and Syed F. R. Khadri. "TOWARD A HIGH-RESOLUTION AGE MODEL FOR THE DECCAN TRAPS BY U-PB ZIRCON GEOCHRONOLOGY." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-305419.

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Reports on the topic "Deccan Traps"

1

Redshaw, Matthew. High Precision Penning Trap Measurements of beta-decay Q-values for Neutrino Physics. Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1865587.

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