Cenomanian-Turonian sea-level transgression and OAE2 deposition in the Western Narmada Basin, India
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UNIL restricted access
State: Public
Version: Final published version
License: All rights reserved
Serval ID
serval:BIB_11127899AD84
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Cenomanian-Turonian sea-level transgression and OAE2 deposition in the Western Narmada Basin, India
Journal
Gondwana Research
ISSN
1342-937X
Publication state
Published
Issued date
06/2021
Peer-reviewed
Oui
Volume
94
Pages
73-86
Language
english
Abstract
We report the Narmada Seaway began in India during the largest global sea-level transgression and Oceanic Anoxic Event 2 (OAE2) δ13C excursion during the late Cenomanian to early Turonian. The transgression progressed eastward during the Turonian-Coniacian and reached Jhilmili by the end of the Maastrichtian. During this time the Narmada and Godavari Seaways may have joined via the Narmada-Tapti rift and formed a Trans-India Seaway. The history of this major seaway is entombed in a fossil-rich marine transgression of the tectonically active Narmada rift zone. We examined this transgression in the western Narmada Basin, Gujarat, to improve age control based on planktic foraminifera and ostracods and evaluate paleoenvironmental changes based on the Cenomanian-Turonian OAE2 δ13C excursion, δ18O records, and mercury concentrations in sediments as index for volcanic eruptions.
Results reveal the onset of the OAE2 δ13C excursion began in the western Narmada Basin during the late Cenomanian coeval with the sea-level transgression and first influx of planktic and benthic foraminifera in the Nimar Sandstone that overlies Archean rocks. The OAE2 δ13C excursion peak was recorded in oyster biostromes followed by fluctuating values of the δ13C plateau in the overlying Limestone with oysters beds, and gradual decrease to background values by the early Turonian. We tested the age of the transgression and δ13C excursion based on planktic foraminifera and ostracod biostratigraphy and successfully compared the results with the Pueblo, Colorado, Global Section and Stratotype Point (GSSP), and the eastern Sinai Wadi El Ghaib section of Egypt.
Results reveal the onset of the OAE2 δ13C excursion began in the western Narmada Basin during the late Cenomanian coeval with the sea-level transgression and first influx of planktic and benthic foraminifera in the Nimar Sandstone that overlies Archean rocks. The OAE2 δ13C excursion peak was recorded in oyster biostromes followed by fluctuating values of the δ13C plateau in the overlying Limestone with oysters beds, and gradual decrease to background values by the early Turonian. We tested the age of the transgression and δ13C excursion based on planktic foraminifera and ostracod biostratigraphy and successfully compared the results with the Pueblo, Colorado, Global Section and Stratotype Point (GSSP), and the eastern Sinai Wadi El Ghaib section of Egypt.
Keywords
Narmada Valley, Interior Seaway, Gujarat, Cenomanian-Turonian OAE2, Planktic Foraminifera, Ostracods
Web of science
Create date
27/06/2021 7:24
Last modification date
14/05/2024 8:27