Palaeoenvironment of Northwestern India during the late Cretaceous Deccan volcanic episode from trace-element and stable-isotope geochemistry of intertrappean ostracod shells

Bajpai, Sunil; Holmes, Jonathan A.; Bennett, Carys E.; Mandal, Nivedita; Khosla, Ashu

doi:10.1016/j.gloplacha.2013.04.011

Cited by 21 publications

(10 citation statements)

References 22 publications

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“…Bennett et al (2011) showed that isotope values, especially for oxygen, of Carboniferous non-marine ostracods from Scotland primarily reflected the degree of diagenetic alteration rather than a palaeoenvironmental signature and warned of the potential for cryptic diagenesis to alter the shells and their isotope values. However, Bajpai et al (2013) derived plausible palaeoenvironmental signatures from both the oxygen and carbon isotope values from Late Cretaceous non-marine shells from peninsular India, some pristine and others showing signs of alteration. For aragonitic mollusc shells, recrystallization to calcite can effectively 'reset' the isotopic signature: mineralogical assessment of shells destined for isotope analyses is therefore often undertaken (e.g., Leng et al 1999).…”

Section: Signal Preservation and Diagenetic Alterationmentioning

confidence: 99%

The stable isotope composition of organic and inorganic fossils in lake sediment records: Current understanding, challenges, and future directions

Hardenbroek

Chakraborty²,

Davies

et al. 2018

Quaternary Science Reviews

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This paper provides an overview of stable isotope analysis (H, C, N, O, Si) of the macroand microscopic remains from aquatic organisms found in lake sediment records and their application in (palaeo)environmental science. Aquatic organisms, including diatoms, macrophytes, invertebrates, and fish, can produce sufficiently robust remains that preserve well as fossils and can be identified in lake sediment records. Stable isotope analyses of these remains can then provide valuable insights into habitat-specific biogeochemistry, feeding ecology, but also on climatic and hydrological changes in and around lakes. Since these analyses focus on the remains of known and identified organisms, they can provide more specific and detailed information on past ecosystem, food web and environmental changes affecting different compartments of lake ecosystems than analyses on bulk sedimentary organic matter or carbonate samples. We review applications of these types of analyses in palaeoclimatology, palaeohydrology, and palaeoecology. Interpretation of the environmental 'signal' provided by taxon-specific stable isotope analysis requires a thorough understanding of the ecology and phenology of the organism groups involved. Growth, metabolism, diet, feeding strategy, migration, taphonomy and several other processes can lead to isotope fractionation or otherwise influence the stable isotope signatures of the remains from aquatic organisms. This paper includes a review of the (modern) calibration, culturing and modeling studies used to quantify the extent to which these factors influence stable isotope values and provides an outlook for future research and methodological developments for the different examined fossil groups.

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Section: Signal Preservation and Diagenetic Alterationmentioning

confidence: 99%

The stable isotope composition of organic and inorganic fossils in lake sediment records: Current understanding, challenges, and future directions

Hardenbroek

Chakraborty²,

Davies

et al. 2018

Quaternary Science Reviews

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“…The predominance of micrite (Figure 3a,c,f) and general absence of dolomite in the limestones (Figure S2), as well as poor correlation between δ 13 C carb and δ 18 O carb values (Figure 6a) clearly evidence against changes in isotopic composition by post-depositional processes (Banner & Hanson, 1990). Furthermore, low Mg/Ca ratio in ostracods from Rajahmundry inter-trappeans suggests minor influence from meteoric alteration in the region (Bajpai et al, 2013). Effects of postdepositional alterations are observed only at the topmost part of the infra-trappean and base of the inter-trappeans.…”

Section: Pco 2 Calculationmentioning

confidence: 97%

Carbon reservoir perturbations induced by Deccan volcanism: Stable isotope and biomolecular perspectives from shallow marine environment in Eastern India

2021

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The Deccan Traps in Western India is hypothesized to have caused significant fluctuations in climatic condition and organic matter (OM) productivity across the Cretaceous-Paleogene Boundary (K/PgB). The periodic release of large amounts of volatiles into the atmosphere is thought to drive these changes. Yet, direct impact of volcanism on the carbon cycle and ecosystem remains relatively unconstrained.For the first time, we attempt to trace changes in both marine and terrestrial carbon reservoirs from pre-and intervolcanic sedimentary units (infra-and inter-trappeans respectively) from Rajahmundry, ~1500 km SE of main eruption sites in Western India.Molecular level characterization of OM and stable isotope composition of carbonates (δ 13 C carb ), bulk OM (δ 13 C org ), and n-alkane (δ 13 C alk and δD alk ) have been analysed to provide a chemo-stratigraphic framework. In Rajahmundry, high CO 2 concentration estimated from infra-trappean carbonate nodule is synchronous with the onset of the Deccan Traps and the Late Maastrichtian warming episode. Impact of the warming event is reflected in Rajahmundry from a major shift in the terrestrial ecosystem.Marine OM production also seems to have been low throughout the infra-trappean. A steady decrease in δ 13 C carb values, increase in mortality rates and dwarfism in invertebrates immediately below the first volcanic units in Rajahmundry suggest stressed conditions from eruption in the western part of India ~40-60 kyrs prior to K/PgB. A significant increase in heterotrophic activity is observed after the volcanic deposits in Rajahmundry that seems to have controlled the marine carbon reservoir for a maximum of ~200 kyrs after the boundary. Advent of pteridophytes, increase in carbon content and positive shifts in δ 13 C carb and δ 13 C alk values in the upper inter-trappean units mark the onset of recovery in terrestrial and marine environments. Overall, our results suggest significant perturbations in the carbon reservoir as a consequence of the Deccan eruption.

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“…S. levis (also refer to Thakre et al, , and references therein) together with ostracods, molluscs, fishes, snakes, lizards, non‐avian dinosaurs, and terrestrial mammals (refer to Table , present study; also see Khosla & Sahni, ; Khosla & Verma, ; Kapur et al, ). In addition, based on a trace‐element and stable isotope approach, Bajpai, Holmes, Bennett, Mandal, and Khosla (), utilizing ostracods from the intertrappean locality of Lakshmipur (north of Saurashtra sub‐province), suggested prevalence of a hydrologically closed lacustrine system that was sourced by meteoric water. Further, based on the carbon isotope data, these authors have suggested that the palaeo‐lake at Lakshimpur was reasonably productive, with long residence time.…”

Section: Palaeoecological Aspectsmentioning

confidence: 99%

“…This is evident by the abundant presence of palynomorphs, namely, Kapur et al, 2018). In addition, based on a trace-element and stable isotope approach, Bajpai, Holmes, Bennett, Mandal, and Khosla (2013), utilizing ostracods from the intertrappean locality of Lakshmipur (north of Saurashtra sub-province), suggested prevalence of a hydrologically closed lacustrine system that was sourced by meteoric water. Further, based on the carbon isotope data, these authors have suggested that .…”

Section: Freshwater-terrestrial Ecosystemmentioning

confidence: 99%

Faunal elements from the Deccan volcano‐sedimentary sequences of India: A reappraisal of biostratigraphic, palaeoecologic, and palaeobiogeographic aspects

Kapur¹,

Khosla

2018

Geological Journal

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The sedimentary sequences associated with the Deccan Flood Basalts, i.e., infratrappean and intertrappean deposits, are known to yield a diverse assemblage of fauna that includes foraminiferans, ostracods, molluscs, fishes, frogs, turtles, lizards, snakes, crocodiles, dinosaurs, and mammals. The existing literature debates the exact nature of origin, age, and duration of the Deccan volcanic activity; however, there is a general accord within the geosciences community that the Deccan Flood Basalts bestrode the Cretaceous–Palaeogene Boundary. Within the past few decades, the record of the biotic component (particularly faunal elements) reported from the Deccan‐volcano sedimentary sequences have grown both numerically and taxonomically. Constraining the age of the Deccan‐volcano sedimentary sequences has a direct bearing on the studies that discuss the origin, evolution of the biota in a palaeobiogeographic framework, and also in the context of changes in the palaeoenvironment and palaeoecology. Thus, it becomes important to reinforce the age, environment of the Deccan‐volcano sedimentary sequences, and the origin/affinity of the faunal elements recovered from within these sedimentary deposits. We here reappraise the biotic (with an emphasis on the fauna) evidence in a biostratigraphic, palaeoecologic, and palaeobiogeographic aspect.

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Palaeoenvironment of Northwestern India during the late Cretaceous Deccan volcanic episode from trace-element and stable-isotope geochemistry of intertrappean ostracod shells

Cited by 21 publications

References 22 publications

The stable isotope composition of organic and inorganic fossils in lake sediment records: Current understanding, challenges, and future directions

The stable isotope composition of organic and inorganic fossils in lake sediment records: Current understanding, challenges, and future directions

Carbon reservoir perturbations induced by Deccan volcanism: Stable isotope and biomolecular perspectives from shallow marine environment in Eastern India

Faunal elements from the Deccan volcano‐sedimentary sequences of India: A reappraisal of biostratigraphic, palaeoecologic, and palaeobiogeographic aspects

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