TY - JOUR
T1 - Effect of Deccan lava flows on the sedimentological evolution of Gurmatkal intertrappeans Karnataka, Southern India
AU - Jalal, Poonam
AU - Pandey, Jyoti Bora
AU - Ahmad, Syed Masood
AU - Dutt, Som
AU - Shukla, Uma Kant
AU - Maddodi, Balakrishna
PY - 2020/6/1
Y1 - 2020/6/1
N2 - Intertrappeans from the vicinity of Gurmatkal, northern Karnataka preserves its depositional and post depositional history during the Cretaceous–Paleogene boundary (KPg) interval. The deposits consist of chertified limestone and limestone successions. The carbonates are rhythmic and fossiliferous. The isotopic δ13C and δ18O values for carbonates are highly negative, which also show a strong correlation among them. The fossil assemblage includes bivalves, ostracodes, gastropods, insects, filamentous algae, and some plant twigs and leaves. The present studies signify fresh water, alkaline, closed basin lake in a terrestrial region. Marginal areas with minor fluctuations of shallow well-oxygenated lacustrine–palustrine settings are revealed from the sedimentological characteristics. Pre-, syn-, and post-sedimentation volcanic activity was prevalent in the area. The increased anaerobic conditions lead to rapid changes in the system. The presence of lateralized zone, red bole morphology, and pedogenized calcretes/silcretes, imply hiatuses between the sedimentation and the overlying lava flows.
AB - Intertrappeans from the vicinity of Gurmatkal, northern Karnataka preserves its depositional and post depositional history during the Cretaceous–Paleogene boundary (KPg) interval. The deposits consist of chertified limestone and limestone successions. The carbonates are rhythmic and fossiliferous. The isotopic δ13C and δ18O values for carbonates are highly negative, which also show a strong correlation among them. The fossil assemblage includes bivalves, ostracodes, gastropods, insects, filamentous algae, and some plant twigs and leaves. The present studies signify fresh water, alkaline, closed basin lake in a terrestrial region. Marginal areas with minor fluctuations of shallow well-oxygenated lacustrine–palustrine settings are revealed from the sedimentological characteristics. Pre-, syn-, and post-sedimentation volcanic activity was prevalent in the area. The increased anaerobic conditions lead to rapid changes in the system. The presence of lateralized zone, red bole morphology, and pedogenized calcretes/silcretes, imply hiatuses between the sedimentation and the overlying lava flows.
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U2 - 10.1002/gj.3711
DO - 10.1002/gj.3711
M3 - Article
AN - SCOPUS:85076090829
SN - 0072-1050
JO - Geological Journal
JF - Geological Journal
ER -