Journal articles: 'Deccan Traps'

1

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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3

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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10

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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Cai, Mingjiang, Zhaokai Xu, Peter D. Clift, Boo-Keun Khim, Dhongil Lim, Zhaojie Yu, Denise K. Kulhanek, and Tiegang Li. "Long-term history of sediment inputs to the eastern Arabian Sea and its implications for the evolution of the Indian summer monsoon since 3.7 Ma." Geological Magazine 157, no. 6 (December 27, 2018): 908–19. http://dx.doi.org/10.1017/s0016756818000857.

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AbstractWe present a new set of clay mineral and grain-size data for the siliciclastic sediment fraction from International Ocean Discovery Program (IODP) Site U1456 located in the eastern Arabian Sea to reconstruct the variabilities in the continental erosion and weathering intensity in the western Himalaya, elucidate the sediment source-to-sink processes and discuss the potential controls underlying these changes since 3.7 Ma. The clay minerals mainly consist of smectite (0–90%, average 44%) and illite (3–90%, average 44%), with chlorite (1–26%, average 7%) and kaolinite (0–19%, average 5%) as minor components. The compositional variations in the clay minerals at IODP Site U1456 suggest four phases of sediment provenance: the Indus River (phase 1, 3.7–3.2 Ma), the Indus River and Deccan Traps (phase 2, 3.2–2.6 Ma), the Indus River (phase 3, 2.6–1.2 Ma) and the Indus River and Deccan Traps (phase 4, 1.2–0 Ma). These provenance changes since 3.7 Ma can be correlated with variations in the Indian summer monsoon intensity. The siliciclastic sediments in the eastern Arabian Sea were mainly derived from the Indus River when the Indian summer monsoon was generally weak. In contrast, when the Indian summer monsoon intensified, the siliciclastic sediment supply from the Deccan Traps increased. In particular, this study shows that the smectite/(illite+chlorite) ratio is a sensitive tool for reconstructing the history of the variation in the Indian summer monsoon intensity over the continents surrounding the Arabian Sea since 3.7 Ma.

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12

Khajuria, Chanchal K., Guntupalli V. R. Prasad, and Brijesh K. Manhas. "Palaeontological constraints on the age of Deccan Traps, peninsular India." Newsletters on Stratigraphy 31, no. 1 (September 15, 1994): 21–32. http://dx.doi.org/10.1127/nos/31/1994/21.

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13

Li, Juan, Xiumian Hu, Eduardo Garzanti, Santanu Banerjee, and Marcelle BouDagher-Fadel. "Late Cretaceous topographic doming caused by initial upwelling of Deccan magmas: Stratigraphic and sedimentological evidence." GSA Bulletin 132, no. 3-4 (August 14, 2019): 835–49. http://dx.doi.org/10.1130/b35133.1.

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Abstract This study focused on uppermost Cretaceous sedimentary rocks deposited in the Himalayan region and around the core of peninsular India just before the eruption of the Deccan Traps. Detailed stratigraphic and sedimentological analysis of Late Cretaceous successions in the Himalayan Range together with literature data from the Kirthar fold-and-thrust belt and central to southeastern India document a marked shallowing-upward depositional trend that took place in the Campanian–Maastrichtian before the Deccan magmatic outburst around the Cretaceous-Tertiary boundary. Topographic uplift of the Indian peninsula began in Campanian time and is held responsible for thick sediment accumulation associated with shorter periods of nondeposition in peripheral areas (Himalayan Range, Kirthar fold belt, and Krishna-Godavari Basin) than in the central part of the Deccan Province. Surface uplift preceding Deccan volcanism took place at warm-humid equatorial latitudes, which may have led to an acceleration of silicate weathering, lowered atmospheric pCO2, and climate cooling starting in the Campanian–Maastrichtian. The radial centrifugal fluvial drainage in India that is still observed today was established at that time.

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Glišović, Petar, and Alessandro M. Forte. "On the deep-mantle origin of the Deccan Traps." Science 355, no. 6325 (February 9, 2017): 613–16. http://dx.doi.org/10.1126/science.aah4390.

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15

Claeys, Georges. "Mineralogical Trips to the Deccan Traps India 1991–2008." Rocks & Minerals 85, no. 3 (April 30, 2010): 220–29. http://dx.doi.org/10.1080/00357521003727207.

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16

Basu, Asish R., Aniki Saha-Yannopoulos, and Puloma Chakrabarty. "A precise geochemical volcano-stratigraphy of the Deccan traps." Lithos 376-377 (December 2020): 105754. http://dx.doi.org/10.1016/j.lithos.2020.105754.

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17

Allègre, C. J., J. L. Birck, F. Capmas, and V. Courtillot. "Age of the Deccan traps using 187Re–187Os systematics." Earth and Planetary Science Letters 170, no. 3 (July 1999): 197–204. http://dx.doi.org/10.1016/s0012-821x(99)00110-7.

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18

Vandamme, D., and V. Courtillot. "Paleomagnetic constraints on the structure of the Deccan traps." Physics of the Earth and Planetary Interiors 74, no. 3-4 (December 1992): 241–61. http://dx.doi.org/10.1016/0031-9201(92)90013-l.

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19

Font, Eric, Anne Nédélec, Brooks B. Ellwood, José Mirão, and Pedro F. Silva. "A new sedimentary benchmark for the Deccan Traps volcanism?" Geophysical Research Letters 38, no. 24 (December 23, 2011): n/a. http://dx.doi.org/10.1029/2011gl049824.

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20

Font, Eric, Jiubin Chen, Marcel Regelous, Anette Regelous, and Thierry Adatte. "Volcanic origin of the mercury anomalies at the Cretaceous-Paleogene transition of Bidart, France." Geology 50, no. 2 (October 20, 2021): 142–46. http://dx.doi.org/10.1130/g49458.1.

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Abstract The timing and mechanisms of the climatic and environmental perturbations induced by the emplacement of the Deccan Traps large igneous province (India) and their contribution to the Cretaceous-Paleogene (K-Pg) mass extinction are still debated. In many marine sediment archives, mercury (Hg) enrichments straddling the K-Pg boundary have been interpreted as the signature of Deccan Traps volcanism, but Hg may also have been derived from the Chicxulub (Mexico) impact. We investigated the Hg isotope composition, as well as the behavior of iridium (Ir) and other trace elements, in K-Pg sediments from the Bidart section in southwest France. Above the K-Pg boundary, Ir content gradually decreases to background values in the Danian carbonates, which is interpreted to indicate the erosion and redistribution of Ir-rich fallouts. No significant enrichment in Ir and W, or Zn and Cu, is observed just below the K-Pg boundary, excluding the hypothesis of downward remobilization of Hg from the boundary clay layer. Positive Δ199Hg and slightly negative values in the upper Maastrichtian and lower part of the early Danian are consistent with the signature of sediments supplied by atmospheric Hg2+ deposition and volcanic emissions. Up section, large shifts to strongly negative mass-dependent fractionation values (δ202Hg) result from the remobilization of Hg formerly sourced by the impactor or by a mixture of different sources including biomass burning, volcanic eruption, and asteroid impact, requiring further investigation. Our results provide additional support for the interpretation that the largest eruptions of the Deccan Traps began just before, and encompassed, the K-Pg boundary and therefore may have contributed to the K-Pg mass extinction.

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Baksi, Ajoy K. "The Rajahmundry Traps, Andhra Pradesh: Evaluation of their petrogenesis relative to the Deccan Traps." Journal of Earth System Science 110, no. 4 (December 2001): 397–407. http://dx.doi.org/10.1007/bf02702903.

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22

Fainstein, Roberto, Mark Richards, and Rajesh Kalra. "Seismic imaging of Deccan-related lava flows at the K-T boundary, deepwater west India." Leading Edge 38, no. 4 (April 2019): 286–90. http://dx.doi.org/10.1190/tle38040286.1.

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Continuous improvements in geophysical technology have enabled seismic imaging of Mesozoic strata under the K-T transition boundary — a thick lava blanket spread along the continental margin of India's west coast. The new images reveal features of the subbasalt geology of this large offshore region. The relationship of the offshore lava flows with the equally vast lava flows of the onshore Deccan Traps adds a parameter of comparison to the whole Mesozoic stratigraphy of the south, west, and northwest coasts of India. The lava flows are part of the deepwater margin that embraces several basins, the largest being the southernmost underexplored Kerala-Konkan Basin. Newly acquired and processed regional seismic data sets were integrated with new data sets of potential field data to better uncover the Mesozoic stratigraphy. The 3D seismic data, acquired with long spreads and broadband processing through time and depth migration, enabled imaging of the complex structure of layers under basalt. India detached from Madagascar during Cretaceous time; the northward path to its present position was affected by Reunion hotspot activity that melted the west coast near the K-T transition time. The volcanic lithology observed at the K-T boundary is related to episodic emplacement of intrusive dykes and extrusive sills. A possible cause-effect event in that span of time is the Chicxulub meteorite impact that may have increased the volume of Deccan lava flows. The deepwater lava volumes estimated from interpretation of seismic data from the offshore region at the end of Cretaceous time are comparable to, or perhaps much greater than, the volumes estimated for the precisely age-dated Deccan Traps basalts exposed onshore. This suggests an enormous outpouring of flood basalts (onshore and offshore) at K-T time that was comparable to other major flood basalt events, such as the Siberian traps, and associated with mass extinctions.

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23

O'Hora, Heidi E., Sierra V. Petersen, Johan Vellekoop, Matthew M. Jones, and Serena R. Scholz. "Clumped-isotope-derived climate trends leading up to the end-Cretaceous mass extinction in northwestern Europe." Climate of the Past 18, no. 9 (September 1, 2022): 1963–82. http://dx.doi.org/10.5194/cp-18-1963-2022.

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Abstract. Paleotemperature reconstructions of the end-Cretaceous interval document local and global climate trends, some driven by greenhouse gas emissions from Deccan Traps volcanism and associated feedbacks. Here, we present a new clumped-isotope-based paleotemperature record derived from fossil bivalves from the Maastrichtian type region in southeastern Netherlands and northeastern Belgium. Clumped isotope data document a mean temperature of 20.4±3.8 ∘C, consistent with other Maastrichtian temperature estimates, and an average seawater δ18O value of 0.2±0.8 ‰ VSMOW for the region during the latest Cretaceous (67.1–66.0 Ma). A notable temperature increase at ∼66.4 Ma is interpreted to be a regional manifestation of the globally defined Late Maastrichtian Warming Event, linking Deccan Traps volcanic CO2 emissions to climate change in the Maastricht region. Fluctuating seawater δ18O values coinciding with temperature changes suggest alternating influences of warm, salty southern-sourced waters and cooler, fresher northern-sourced waters from the Arctic Ocean. This new paleotemperature record contributes to the understanding of regional and global climate response to large-scale volcanism and ocean circulation changes leading up to a catastrophic mass extinction.

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Schoene, Blair, Michael P. Eddy, C. Brenhin Keller, and Kyle M. Samperton. "An evaluation of Deccan Traps eruption rates using geochronologic data." Geochronology 3, no. 1 (April 16, 2021): 181–98. http://dx.doi.org/10.5194/gchron-3-181-2021.

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Abstract. Recent attempts to establish the eruptive history of the Deccan Traps large igneous province have used both U−Pb (Schoene et al., 2019) and 40Ar/39Ar (Sprain et al., 2019) geochronology. Both of these studies report dates with high precision and unprecedented coverage for a large igneous province and agree that the main phase of eruptions began near the C30n–C29r magnetic reversal and waned shortly after the C29r–C29n reversal, totaling ∼ 700–800 kyr duration. These datasets can be analyzed in finer detail to determine eruption rates, which are critical for connecting volcanism, associated volatile emissions, and any potential effects on the Earth's climate before and after the Cretaceous–Paleogene boundary (KPB). It is our observation that the community has frequently misinterpreted how the eruption rates derived from these two datasets vary across the KPB. The U−Pb dataset of Schoene et al. (2019) was interpreted by those authors to indicate four major eruptive pulses before and after the KPB. The 40Ar/39Ar dataset did not identify such pulses and has been largely interpreted by the community to indicate an increase in eruption rates coincident with the Chicxulub impact (Renne et al., 2015; Richards et al., 2015). Although the overall agreement in eruption duration is an achievement for geochronology, it is important to clarify the limitations in comparing the two datasets and to highlight paths toward achieving higher-resolution eruption models for the Deccan Traps and for other large igneous provinces. Here, we generate chronostratigraphic models for both datasets using the same statistical techniques and show that the two datasets agree very well. More specifically, we infer that (1) age modeling of the 40Ar/39Ar dataset results in constant eruption rates with relatively large uncertainties through the duration of the Deccan Traps eruptions and provides no support for (or evidence against) the pulses identified by the U−Pb data, (2) the stratigraphic positions of the Chicxulub impact using the 40Ar/39Ar and U−Pb datasets do not agree within their uncertainties, and (3) neither dataset supports the notion of an increase in eruption rate as a result of the Chicxulub impact. We then discuss the importance of systematic uncertainties between the dating methods that challenge direct comparisons between them, and we highlight the geologic uncertainties, such as regional stratigraphic correlations, that need to be tested to ensure the accuracy of eruption models. While the production of precise and accurate geochronologic data is of course essential to studies of Earth history, our analysis underscores that the accuracy of a final result is also critically dependent on how such data are interpreted and presented to the broader community of geoscientists.

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25

Singh, R. N., and K. R. Gupta. "Workshop yields new insight into volcanism at Deccan Traps, India." Eos, Transactions American Geophysical Union 75, no. 31 (1994): 356. http://dx.doi.org/10.1029/94eo01005.

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26

Parthasarathy, A., S. D. Shah, and Amar N. Joshi. "Salient engineering geological aspects of deccan traps in Western India." Bulletin of the International Association of Engineering Geology 31, no. 1 (June 1985): 105–9. http://dx.doi.org/10.1007/bf02594753.

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Joshi, Mayank, S. Rajappan, P. Prasobh Rajan, J. Mathai, G. Sankar, V. Nandakumar, and V. Anil Kumar. "Weathering Controlled Landslide in Deccan Traps: Insight from Mahabaleshwar, Maharashtra." Journal of the Geological Society of India 92, no. 5 (November 2018): 555–61. http://dx.doi.org/10.1007/s12594-018-1067-7.

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Sheth, Hetu C., George Mathew, Kanchan Pande, Soumen Mallick, and Balaram Jena. "Cones and craters on Mount Pavagadh, Deccan Traps: Rootless cones?" Journal of Earth System Science 113, no. 4 (December 2004): 831–38. http://dx.doi.org/10.1007/bf02704041.

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McLean, Dewey M. "Deccan traps mantle degassing in the terminal Cretaceous marine extinctions." Cretaceous Research 6, no. 3 (September 1985): 235–59. http://dx.doi.org/10.1016/0195-6671(85)90048-5.

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30

Peng, Z. X., J. J. Mahoney, P. R. Hooper, J. D. Macdougall, and P. Krishnamurthy. "Basalts of the northeastern Deccan Traps, India: Isotopic and elemental geochemistry and relation to southwestern Deccan stratigraphy." Journal of Geophysical Research: Solid Earth 103, B12 (December 10, 1998): 29843–65. http://dx.doi.org/10.1029/98jb01514.

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MAHONEY, J. J., H. C. SHETH, D. CHANDRASEKHARAM, and Z. X. PENG. "Geochemistry of Flood Basalts of the Toranmal Section, Northern Deccan Traps, India: Implications for Regional Deccan Stratigraphy." Journal of Petrology 41, no. 7 (July 1, 2000): 1099–120. http://dx.doi.org/10.1093/petrology/41.7.1099.

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Schoene, Blair, Michael P. Eddy, Kyle M. Samperton, C. Brenhin Keller, Gerta Keller, Thierry Adatte, and Syed F. R. Khadri. "U-Pb constraints on pulsed eruption of the Deccan Traps across the end-Cretaceous mass extinction." Science 363, no. 6429 (February 21, 2019): 862–66. http://dx.doi.org/10.1126/science.aau2422.

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Temporal correlation between some continental flood basalt eruptions and mass extinctions has been proposed to indicate causality, with eruptive volatile release driving environmental degradation and extinction. We tested this model for the Deccan Traps flood basalt province, which, along with the Chicxulub bolide impact, is implicated in the Cretaceous-Paleogene (K-Pg) extinction approximately 66 million years ago. We estimated Deccan eruption rates with uranium-lead (U-Pb) zircon geochronology and resolved four high-volume eruptive periods. According to this model, maximum eruption rates occurred before and after the K-Pg extinction, with one such pulse initiating tens of thousands of years prior to both the bolide impact and extinction. These findings support extinction models that incorporate both catastrophic events as drivers of environmental deterioration associated with the K-Pg extinction and its aftermath.

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R., Rangarajan, and Rolland Andrade. "Understanding Shallow Basaltic Aquifer System Near West Coast of Maharashtra, India." Journal of Geosciences Research 8, no. 1 (January 1, 2023): 49–57. http://dx.doi.org/10.56153/g19088-022-0120-25.

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Two-Dimensional (2D) Electrical Resistivity Tomography (ERT) and geophysical logging and injected tritium tracer studies with hydrogeological tests were carried out at selected location in an area of 5 km2 near the coastal region of Tarapur, Thane district, Maharashtra. The area is in basaltic terrain, overlain by thin cap of alluvium formation and receives an annual rainfall of about 2000 mm. An integrated investigation method was adopted to delineate the subsurface lithological variations, understand the existing aquifer system up to 25 m depth, evaluate aquifer properties, recharge potential and also to monitor the groundwater flow characteristics. The investigation results showed a variable thickness of weathered zone of 1-3 m, existence of two basalt flows, low vertical natural recharge, high transmissivity, high hydraulic conductivity and high groundwater flow rates. The results also depicted that a combination of hydrogeological tests along with resistivity and tracer investigation is an effective tool in mapping and characterizing the shallow potential groundwater aquifer zone in Deccan traps. The integrated study carried out in the coastal area provided detailed subsurface information useful for planning specific water conservation strategies for sustainable groundwater supply. Keywords: Deccan Traps, ERT, Tritium Tracer, Recharge, Groundwater Flow

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Renne, Paul R., Courtney J. Sprain, Mark A. Richards, Stephen Self, Loÿc Vanderkluysen, and Kanchan Pande. "State shift in Deccan volcanism at the Cretaceous-Paleogene boundary, possibly induced by impact." Science 350, no. 6256 (October 1, 2015): 76–78. http://dx.doi.org/10.1126/science.aac7549.

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Bolide impact and flood volcanism compete as leading candidates for the cause of terminal-Cretaceous mass extinctions. High-precision 40Ar/39Ar data indicate that these two mechanisms may be genetically related, and neither can be considered in isolation. The existing Deccan Traps magmatic system underwent a state shift approximately coincident with the Chicxulub impact and the terminal-Cretaceous mass extinctions, after which ~70% of the Traps' total volume was extruded in more massive and more episodic eruptions. Initiation of this new regime occurred within ~50,000 years of the impact, which is consistent with transient effects of impact-induced seismic energy. Postextinction recovery of marine ecosystems was probably suppressed until after the accelerated volcanism waned.

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Knight, Kim B., Paul R. Renne, Angus Halkett, and Nicky White. "40Ar/39Ar dating of the Rajahmundry Traps, Eastern India and their relationship to the Deccan Traps." Earth and Planetary Science Letters 208, no. 1-2 (March 2003): 85–99. http://dx.doi.org/10.1016/s0012-821x(02)01154-8.

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Sheth, Hetu, Hrishikesh Samant, Vanit Patel, and Joseph D’Souza. "The Volcanic Geoheritage of the Elephanta Caves, Deccan Traps, Western India." Geoheritage 9, no. 3 (December 24, 2016): 359–72. http://dx.doi.org/10.1007/s12371-016-0214-z.

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Avasia, R. K., and L. G. Gwalani. "Lamprophyres within the Deccan Traps of Chhota Udaipur, Gujarat State, India." Chemical Geology 70, no. 1-2 (August 1988): 66. http://dx.doi.org/10.1016/0009-2541(88)90376-2.

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Cucciniello, Ciro, Ashwini Kumar Choudhary, Kanchan Pande, and Hetu Sheth. "Mineralogy, geochemistry and 40Ar–39Ar geochronology of the Barda and Alech complexes, Saurashtra, northwestern Deccan Traps: early silicic magmas derived by flood basalt fractionation." Geological Magazine 156, no. 10 (January 22, 2019): 1668–90. http://dx.doi.org/10.1017/s0016756818000924.

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AbstractMost continental flood basalt (CFB) provinces of the world contain silicic (granitic and rhyolitic) rocks, which are of significant petrogenetic interest. These rocks can form by advanced fractional crystallization of basaltic magmas, crustal assimilation with fractional crystallization, partial melting of hydrothermally altered basaltic lava flows or intrusions, anatexis of old basement crust, or hybridization between basaltic and crustal melts. In the Deccan Traps CFB province of India, the Barda and Alech Hills, dominated by granophyre and rhyolite, respectively, form the largest silicic complexes. We present petrographic, mineral chemical, and whole-rock geochemical (major and trace element and Sr–Nd isotopic) data on rocks of both complexes, along with 40Ar–39Ar ages of 69.5–68.5 Ma on three Barda granophyres. Whereas silicic magmatism in the Deccan Traps typically postdates flood basalt eruptions, the Barda granophyre intrusions (and the Deccan basalt flows they intrude) significantly pre-date (by 3–4 My) the intense 66–65 Ma flood basalt phase forming the bulk of the province. A tholeiitic dyke cutting the Barda granophyres contains quartzite xenoliths, the first being reported from Saurashtra and probably representing Precambrian basement crust. However, geochemical–isotopic data show little involvement of ancient basement crust in the genesis of the Barda–Alech silicic rocks. We conclude that these rocks formed by advanced (70–75 %), nearly-closed system fractional crystallization of basaltic magmas in crustal magma chambers. The sheer size of each complex (tens of kilometres in diameter) indicates a very large mafic magma chamber, and a wide, pronounced, circular-shaped gravity high and magnetic anomaly mapped over these complexes is arguably the geophysical signature of this solidified magma chamber. The Barda and Alech complexes are important for understanding CFB-associated silicic magmatism, and anorogenic, intraplate silicic magmatism in general.

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Peng, Zhan X., John J. Mahoney, Loÿc Vanderkluysen, and Peter R. Hooper. "Sr, Nd and Pb isotopic and chemical compositions of central Deccan Traps lavas and relation to southwestern Deccan stratigraphy." Journal of Asian Earth Sciences 84 (April 2014): 83–94. http://dx.doi.org/10.1016/j.jseaes.2013.10.025.

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Premović, Pavle I. "Cretaceous-Paleogene Boundary Clays from Spain and New Zealand: Arsenic Anomaly and the Deccan Traps." International Letters of Natural Sciences 55 (June 2016): 1–8. http://dx.doi.org/10.18052/www.scipress.com/ilns.55.1.

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High arsenic (As) contents have been reported in numerous Cretaceous-Paleogene boundary (KPB) clays worldwide including that from Spain (at Caravaca and Agost) and N. Zealand (at Woodside Creek). The Deccan Traps (India) enormous volcanism is one of the interpretations which have been offered to explain this anomaly. This report shows that the estimated surface densities of As in the boundary clays in Spain and New Zealand strongly contradict that anomalous As was sourced by this volcanic event.

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Premović, Pavle I. "Cretaceous-Paleogene Boundary Clays from Spain and New Zealand: Arsenic Anomaly and the Deccan Traps." International Letters of Natural Sciences 55 (June 3, 2016): 1–8. http://dx.doi.org/10.56431/p-zqqiro.

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High arsenic (As) contents have been reported in numerous Cretaceous-Paleogene boundary (KPB) clays worldwide including that from Spain (at Caravaca and Agost) and N. Zealand (at Woodside Creek). The Deccan Traps (India) enormous volcanism is one of the interpretations which have been offered to explain this anomaly. This report shows that the estimated surface densities of As in the boundary clays in Spain and New Zealand strongly contradict that anomalous As was sourced by this volcanic event.

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Smith, Selena Y., Steven R. Manchester, Bandana Samant, Dhananjay M. Mohabey, Elisabeth Wheeler, Pieter Baas, Dashrath Kapgate, Rashmi Srivastava, and Nathan D. Sheldon. "Integrating Paleobotanical, Paleosol, and Stratigraphic Data to Study Critical Transitions: A Case Study From The Late Cretaceous–Paleocene Of India." Paleontological Society Papers 21 (October 2015): 137–66. http://dx.doi.org/10.1017/s1089332600002990.

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During the Cretaceous and Paleogene, the Indian subcontinent was isolated as it migrated north from the east coast of Africa to collide with Asia. As it passed over the Reunion hotspot in the late Maastrichtian–early Danian, a series of lava flows extruded, known as the Deccan Traps. Also during this interval, there was a major mass-extinction event at the Cretaceous–Paleogene boundary, punctuated by a meteorite impact at Chicxulub, Mexico. What were the biological implications of these changes in paleogeography and the extensive volcanism in terms of biodiversity, evolution, and biogeography? By combining chronostratigraphic, paleosol, and paleobotanical data, an understanding of how the ecosystems and climates changed and the relative contributions of the Chicxulub impact, Deccan Traps volcanism, and paleogeographic isolation can be gained. Understanding relative ages of paleobotanical localities is crucial to determining floristic changes, and is challenging because different methods (e.g., magnetostratigraphy, radiometric dating, vertebrate and microfossil biostratigraphy) sometimes give conflicting answers, or have not been done for paleobotanical localities. Climatic data can be obtained quantitatively by studying paleosol geochemistry, as well as qualitatively by examining functional traits and nearest living relatives of fossil plants. An additional challenge is revising macrofossil data, which includes some confidently identified taxa and others with uncertain affinities. This is important for understanding ecosystem composition both spatially and temporally, as well as the biogeographic implications of an isolated India.

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Borges, Melroy R., Gautam Sen, Garret L. Hart, John A. Wolff, and D. Chandrasekharam. "Plagioclase as recorder of magma chamber processes in the Deccan Traps: Sr-isotope zoning and implications for Deccan eruptive event." Journal of Asian Earth Sciences 84 (April 2014): 95–101. http://dx.doi.org/10.1016/j.jseaes.2013.10.034.

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Vanderkluysen, Loÿc, John J. Mahoney, Peter R. Hooper, Hetu C. Sheth, and Ranjini Ray. "The Feeder System of the Deccan Traps (India): Insights from Dike Geochemistry." Journal of Petrology 52, no. 2 (January 3, 2011): 315–43. http://dx.doi.org/10.1093/petrology/egq082.

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Buckley, D. K., and D. Oliver. "Geophysical logging of water exploration boreholes in the Deccan Traps, Central India." Geological Society, London, Special Publications 48, no. 1 (1990): 153–61. http://dx.doi.org/10.1144/gsl.sp.1990.048.01.13.

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Sheth, Hetu C., and Leone Melluso. "The Mount Pavagadh volcanic suite, Deccan Traps: Geochemical stratigraphy and magmatic evolution." Journal of Asian Earth Sciences 32, no. 1 (February 2008): 5–21. http://dx.doi.org/10.1016/j.jseaes.2007.10.001.

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Owen-Smith, T. M., L. D. Ashwal, T. H. Torsvik, M. Ganerød, O. Nebel, S. J. Webb, and S. C. Werner. "Seychelles alkaline suite records the culmination of Deccan Traps continental flood volcanism." Lithos 182-183 (December 2013): 33–47. http://dx.doi.org/10.1016/j.lithos.2013.09.011.

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Das, D. K. "An occurrence of marsh gas in deccan traps (Basalt) in central India." Environmental Geology and Water Sciences 10, no. 2 (June 1987): 103–4. http://dx.doi.org/10.1007/bf02574667.

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Bhave, Neha, M. Imran Siddique, Jayesh Desai, Shilpa Patil Pillai, Gauri Dole, Himanshu Kulkarni, and Vivek S. Kale. "Faulting in Deccan Traps in the vicinity of Koyna-Warna Seismic Zone." Journal of the Geological Society of India 90, no. 6 (December 2017): 748–51. http://dx.doi.org/10.1007/s12594-017-0786-5.

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Sheth, H. C. "The emplacement of pahoehoe lavas on Kilauea and in the Deccan Traps." Journal of Earth System Science 115, no. 6 (December 2006): 615–29. http://dx.doi.org/10.1007/s12040-006-0007-x.

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Journal articles on the topic 'Deccan Traps'

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