Nummulitids, lepidocyclinids and Sr-isotope data from the Oligocene of Kutch (western India) with chronostratigraphic and paleobiogeographic evaluations

Less, György; Frijia, Gianluca; Özcan, Ercan; Saraswati, Pratul Kumar; Parente, Mariano; Kumar, Pramod

doi:10.1080/09853111.2018.1465214

Cited by 31 publications

(46 citation statements)

References 44 publications

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“…The shaded regions represent the error limits for the corresponding age estimates. The open square represents the age estimate from Less et al (). [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…2J,K) and faunal description, it is likely that one of the dated layers coincides with SB 02 of the present study. Less et al () assigned an age of 23.15 ± 0.95 Ma to this unit. This age aligns with our deduced older age for SB 01 (Fig.…”

Section: Discussionmentioning

confidence: 96%

“…Because SB 01 is the lower most fossiliferous unit of Bermoti member, the remaining fossiliferous unit of the same formation is younger. In a recent study, Less et al () assigned a Late Chattian age to the Bermoti member based on a Sr‐stratigraphy and foraminiferal assemblage. Based on the reported location (Less et al, , p. 186–187, fig.…”

Section: Discussionmentioning

confidence: 99%

“…In a recent study, Less et al () assigned a Late Chattian age to the Bermoti member based on a Sr‐stratigraphy and foraminiferal assemblage. Based on the reported location (Less et al, , p. 186–187, fig. 2J,K) and faunal description, it is likely that one of the dated layers coincides with SB 02 of the present study.…”

Section: Discussionmentioning

confidence: 99%

“…The Oligocene–Early Miocene fossiliferous lithounits of the Kutch Basin particularly have a high abundance of calcitic forms such as oyster and pectinid among other marine bivalves. The characteristic low‐Mg calcite composition and foliated microstructure make these shells resistant to recrystallization during burial, and the preservation can be screened by petrographical and geochemical methods (McArthur ; Ullmann & Korte ; Less et al ). In this study, we report the Sr isotope chronostratigraphy‐based age estimates for four lithounits of the Oligocene–Early Miocene formations of the Kutch Basin.…”

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confidence: 99%

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Strontium stratigraphy of the Oligocene–Early Miocene shellbeds of the Kutch Basin, western India, and its implications

Dutta

Chattopadhyay

et al. 2020

LET

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The Kutch Basin is unique among the western Indian sedimentary basins because of its near‐complete sequence of post‐Palaeozoic rocks. Due to extensive marine influence, the Oligocene–Early Miocene formations of the basin, namely Maniyara Fort, Khari Nadi and Chhasra, contain numerous shellbeds. Although age assignments of these formations exist based on foraminiferal biostratigraphy, detailed numerical age of the lithounits are yet to be established. We have identified a total of eleven distinct shellbeds (oldest SB 01 to youngest SB11) from this interval primarily containing bivalve fossils. Using 87Sr/86Sr of selected oyster and pectinid shells with pristine shell characteristics, we report the age of four shellbeds. The ages of SB 01, SB 04, SB 06 and SB 10 are 24.37, 17.31, 16.85 and 15.38 Ma, respectively. Our dates suggest a Chattian (24.37 Ma) age for SB 01 from the Bermoti Member, validating the previous biostratigraphical estimates from the Maniyara Fort Formation. The Chhasra Formation, however, shows a younger range of ages (17.31–15.38 Ma) characterized by a transition from the Burdigalian (SB 04–SB 06) to the Langhian (SB 10) stages. These dates have important implications in the study of sequence stratigraphy, Palaeobiogeography and tectonic history of the Kutch Basin. A surface with subaerial exposure is found in SB 08 (between 16.85 and 15.38 Ma) that corresponds to a global eustatic sea‐level decrease (Mi2). Our new dates will also help evaluate the response of marine fauna to the closure of the Tethyan seaway around 19 Ma due to the formation of ‘Gomphotherium Landbridge’. The dated shellbeds enable us to identify pre‐ and post‐closure fauna and assess the effect of biogeographical separation on these fauna. These dates have important implications in evaluating the regional geological record of western India in the context of various global events.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Strontium stratigraphy of the Oligocene–Early Miocene shellbeds of the Kutch Basin, western India, and its implications

Dutta

Chattopadhyay

et al. 2020

LET

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Palaeocene to Miocene southern Tethyan carbonate factories: A meta‐analysis of the successions of South‐western and Western Central Asia

Coletti

Commissario

Mariani

et al. 2022

The Depositional Record

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Strontium isotope stratigraphy of marine Oligocene–Miocene sedimentary successions of Kutch Basin, western India

Singh,

Vadlamani,

Bajpai

et al. 2024

Geological Journal

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The Kutch Basin of western India exposes one of the most complete, fossiliferous marine Cenozoic sedimentary sequences of India. Precise depositional ages of these sequences are of great importance in the reconstruction of palaeoclimatic and palaeobiogeographic histories of the basin. Due to the poorly constrained foraminiferal biostratigraphic ages, we conducted high‐resolution 87Sr/86Sr chronology of the various fossiliferous, stratigraphically continuous units of Oligocene–Miocene strata in Kutch Basin. Besides updating the previously determined 87Sr/86Sr chronology, we report new numerical depositional ages for Oligocene–Miocene formations and members, and correlated these ages to the existing biostratigraphic schemes. The new 87Sr/86Sr data indicates a depositional age range between 28.64 + 0.29/‐1.11 and 23.51 + 1.53/‐1.85 Ma (Rupelian‐Chattian) for the Maniyara Fort Formation, between 23.07 + 0.94/1.39 and 18.09 + 0.24/‐0.57 Ma (Chattian‐Burdigalian) for the Khari Nadi Formation, and between 15.11 + 0.56/‐2.87 and 12.29 + 1.22/‐1.9 Ma (Langhian‐Serravallian) for the Chhasra Formation. The sedimentation rate, determined through numerical ages derived from 87Sr/86Sr, indicates an increase in sedimentation for the Khari Nadi (0.23 ± 0.04 cm/kyr) and Chhasra (0.12 ± 0.04 cm/kyr) formations, likely related to uplift of the Himalaya‐Tibetan plateau and intensification of the Indian Summer Monsoon. The bulk sediment element ratios (V/Ni, Ni/Co and V/Cr) indicate oxic to suboxic palaeo‐redox conditions during deposition of the Oligocene–Miocene successions of the basin. Based on new and updated 87Sr/86Sr chronology, the depositional environments and sedimentation rates of the Kutch sequence are correlated with changes in sea‐level, sedimentation rates in the Arabian Sea and Bay of Bengal, and the global climate changes across the Oligocene–Miocene boundary.

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Nummulitids, lepidocyclinids and Sr-isotope data from the Oligocene of Kutch (western India) with chronostratigraphic and paleobiogeographic evaluations

Cited by 31 publications

References 44 publications

Strontium stratigraphy of the Oligocene–Early Miocene shellbeds of the Kutch Basin, western India, and its implications

Strontium stratigraphy of the Oligocene–Early Miocene shellbeds of the Kutch Basin, western India, and its implications

Palaeocene to Miocene southern Tethyan carbonate factories: A meta‐analysis of the successions of South‐western and Western Central Asia

Strontium isotope stratigraphy of marine Oligocene–Miocene sedimentary successions of Kutch Basin, western India

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