Morphogroups and small sized tests in Pseudotextularia elegans (Rzehak) from the Late Maastrichtian succession of Meghalaya, India as indicators of biotic response to paleoenvironmental stress

Mukhopadhyay, Sanjay Kumar

doi:10.1016/j.jseaes.2011.11.020

Cited by 14 publications

(9 citation statements)

References 66 publications

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“…when the second and the most vigorous Deccan volcanic eruption occurred at 65.4-65.2 Ma (Barrera, 1994;Courtillot et al, 1996;Hoffman et al, 2000;Keller, 2001;Kumar et al, 2020;Shrivastava & Ahmad, 2005;Shrivastava et al, 2015;Sonu et al, 2021). This younger anomaly level is marked by the high concentration of microspherule (Mukhopadhyay, 2012b). Moreover, USR succession correlates well with the global stratotype section and point (Gross, 2017),…”

Section: Pah Compounds and Wildfire Incidencesmentioning

confidence: 83%

“…Bhandari et al (1987) recognized Ir anomaly within the biozone CF4 and is considered as coeval with the first phase of the Deccan volcanic eruption, whereas the upper anomaly‐bearing layer was found within the biozone CF2 when the second and the most vigorous Deccan volcanic eruption occurred at 65.4–65.2 Ma (Barrera, 1994; Courtillot et al, 1996; Hoffman et al, 2000; Keller, 2001; Kumar et al, 2020; Shrivastava & Ahmad, 2005; Shrivastava et al, 2015; Sonu et al, 2021). This younger anomaly level is marked by the high concentration of microspherule (Mukhopadhyay, 2012b). Moreover, USR succession correlates well with the global stratotype section and point (Gross, 2017), which yielded critical information related to Deccan volcanism main phase 2 during the latest Maastrichtian chron 29r.…”

Section: Discussionmentioning

confidence: 99%

“…Showing major Deccan eruptive phases, timing of the KPB transition events, and organo molecular compounds (associated with the shelf and shallow‐marine facies of MCR and USR sections, respectively) calibrated with respect to biozonations and GSSP El Kef (Tunisia) sections (as a reference). Data Source : Bhandari et al (1994), Mukhopadhyay (2008, 2009, 2010, 2012a, 2012b, 2016), Shrivastava et al (2013), Pal et al (2015a, 2015b, 2015c). 1 = Schoene et al (2019); 2 = Keller et al (2020), 3 = Pal et al (2015a, 2015b), 5 = Samant et al (2014); 6 = Punekar et al (2016), 7 = Keller and Lindinger (1989), and 8 = Gross (2017).…”

Section: Discussionmentioning

confidence: 99%

“…Overall, integration of shelf and shallow-marine biomarker data (Figure 8) was used as an additional limit on the paleoenvironmental changes that occurred across the KPB. (1994), Mukhopadhyay (2008Mukhopadhyay ( , 2009Mukhopadhyay ( , 2010Mukhopadhyay ( , 2012aMukhopadhyay ( , 2012bMukhopadhyay ( , 2016, Shrivastava et al (2013), Pal et al (2015aPal et al ( , 2015bPal et al ( , 2015c. Therriaghat blocks (Mukhopadhyay, 2016).…”

Section: Comparison Between Shelf and Shallowmarine Biomarkersmentioning

confidence: 99%

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Fire activity across Cretaceous/Paleogene transition: Evidence from pyrogenic biomarkers preserved in the Mahadeo‐Cherrapunji section, Meghalaya, India

Pal,

Shrivastava,

Kalpana

2023

Geobiology

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Previous studies on high concentrations of polycyclic aromatic hydrocarbon (PAHs) present in the shallow‐marine Um‐Sohryngkew River (USR) Cretaceous/Paleogene Boundary (KPB) section suggested regional fire incidences and biotic stress on life. However, such observations at the USR site have not been confirmed so far anywhere else in the region, we, therefore, do not know whether the signal was local or regional. Thus, to find out charred organic markers associated with the shelf facies KPB outcrop (at a distance of over 5 km) of the Mahadeo‐Cherrapunji road (MCR) section, PAHs were analyzed using gas chromatography–mass spectroscopy. Data show a notable rise in the PAHs and exhibit maximum abundance in the shaly KPB transition layer (in biozone P0) and the immediately underlying layer. The PAH excursions match well with the major incidences of the Deccan volcanic episodes and convergence of the Indian plate with the Eurasian and Burmese plates. These events were responsible for seawater disturbances and eustatic and depositional changes, including the retreat of the Tethys. The incidence of high amount of pyogenic PAHs unrelated to the total organic carbon content is suggestive of wind‐blown or aquatic system transportation. A down‐thrown shallow‐marine facies of the Therriaghat block was responsible for an early accumulation of PAHs. However, the spike of perylene in the immediately underlying KPB transition layer is plausibly linked to the Chicxulub impact crater core. Anomalous concentrations of combustion‐derived PAHs together with the high fragmentation and dissolution of the planktonic foraminifer shells show marine biodiversity and biotic distress. Significantly, the pyrogenic PAH excursions are restricted to either the KPB layer itself or strictly below or above it, indicating regional fire incidences and attendant KPB transition (66.016 ± 0.050 Ma).

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Section: Pah Compounds and Wildfire Incidencesmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Comparison Between Shelf and Shallowmarine Biomarkersmentioning

confidence: 99%

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Fire activity across Cretaceous/Paleogene transition: Evidence from pyrogenic biomarkers preserved in the Mahadeo‐Cherrapunji section, Meghalaya, India

Pal,

Shrivastava,

Kalpana

2023

Geobiology

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“…General absence of Psedutexularia elegans in biozone CF1 is also noticed, indicating that the species were unable to sustain in the cold sea water. The size reduction of P. elegans is possibly due to stressful environmental conditions -warming in the climate, acid rain and CO 2 emissions related to Deccan volcanism and sea-level changes or sea replacement of Tethys by Indo-Pacific Ocean, or by local tectonic changes 38 . However, the presence of abnormally high amount of combustion-derived PAH compounds in the yellowishbrown clay layer of biozone CF3 (sample JP-12) corresponds to 66.83-65.45 Ma coinciding with the Ce anomaly layer 11 , but preceeded by the planktonic foraminiferal break and PGE anomaly-bearing layer, lying between biozones P0 and CF2 (refs 12, 13).…”

mentioning

confidence: 99%

Polycyclic aromatic hydrocarbon compound excursions and K/Pg transition in the late Cretaceous–early Palaeogene succession of the Um Sohryngkew river section, Meghalaya

Pal¹,

Shrivastava²,

Mukhopadhyay³

2015

Current Science

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A combustion-derived polycyclic aromatic hydrocarbon (PAH) compounds based high-resolution stratigraphic records across the Cretaceous/Palaeogene boundary section of the Um Sohryngkew river section is presented in this paper. The yellowish brown, organic-rich, 1 to 2 mm thick, clay layer in biozone CF3 is marked by sudden increase in the high molecular weight fluoranthene, pyrene, chrysene, benzo(a) anthracene PAH compounds. These componds are similar to those associated with the well-known K/Pg boundary sections across the world. Besides these, high abundance of low molecular weight 3 ring anthracene and fluorine, and 4 ring PAH compounds is also noticed in this layer. Subordinate amount of low molecular weight 3-ring phenanthrene, 3-methylphenanthrene, 2-methylphenanthrene, 9-methylphenanthrene and 1-methylphenanthrene PAH compounds have also been found in the successive layer of biozone CF2. Occurrence of high molecular weight PAH compounds in the biozone CF3 (66.83-65.45 Ma age) imply global fire, induced by the heat supplied by Abor/ Deccan volcanic activity, possibly linked with the K/Pg boundary transition events as later initiated prior to the K/Pg boundary, however, the main episode of Deccan volcanic activity occurred ~300 ky earlier or at the K/Pg boundary itself. PAH compound anomalies in the biozone CF3 is well coinciding with the well documented Ce anomaly layer, but, preceded by planktonic foraminiferal break and PGE anomaly bearing layer in the biozone P0. It is inferred that the K/Pg boundary related global fire played significant role in the collapse of the ecosystem, causing sudden demise of organisms.

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Foraminiferal Effects of Regional Fire and Attendant Paleoenvironment During K/Pg Transition: Organo-Chemical Evidence from the Um Sohryngkew River Section, Meghalaya, India

Pal

Shrivastava

Mukhopadhyay

2018

Society of Earth Scientists Series

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Morphogroups and small sized tests in Pseudotextularia elegans (Rzehak) from the Late Maastrichtian succession of Meghalaya, India as indicators of biotic response to paleoenvironmental stress

Cited by 14 publications

References 66 publications

Fire activity across Cretaceous/Paleogene transition: Evidence from pyrogenic biomarkers preserved in the Mahadeo‐Cherrapunji section, Meghalaya, India

Fire activity across Cretaceous/Paleogene transition: Evidence from pyrogenic biomarkers preserved in the Mahadeo‐Cherrapunji section, Meghalaya, India

Polycyclic aromatic hydrocarbon compound excursions and K/Pg transition in the late Cretaceous–early Palaeogene succession of the Um Sohryngkew river section, Meghalaya

Foraminiferal Effects of Regional Fire and Attendant Paleoenvironment During K/Pg Transition: Organo-Chemical Evidence from the Um Sohryngkew River Section, Meghalaya, India

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