Multiproxy evidence of main Deccan Traps pulse near the Cretaceous-Tertiary boundary

Author(s): Adatte, Thierry; Keller, Gerta
Author Affiliation(s): Primary:
Université de Lausanne, Institut de Géologie et Paléontologie, Lausanne, Switzerland
Princeton University, United States
Volume Title: Proceedings of XXIII Indian colloquium on Micropaleontology and stratigraphy and international symposium on Global bioevents in Earth's history
Volume Author(s): Malarkodi, Nallamuthu, editor; Keller, Gerta; Reddy, A. Nallapa; Jaiprakash, B. C.
Source: Special Publication - Geological Society of India, Vol.1, p.243-259; XXIII Indian colloquium on Micropaleontology and stratigraphy and international symposium on Global bioevents in Earth's history, Bangalore, India, Dec. 9-11, 2011, edited by Nallamuthu Malarkodi, Gerta Keller, A. Nallapa Reddy and B. C. Jaiprakash. Publisher: Geological Society of India, Bengaluru, India
Note: In English. 101 refs.; illus., incl. strat. col., geol. sketch maps
Summary: Recent studies indicate that the bulk (80%) of Deccan trap eruptions occurred over a relatively short time interval in magnetic polarity C29r, whereas multiproxy studies from central and southeastern India place the Cretaceous-Tertiary (KT) mass extinction near the end of this main phase of Deccan volcanism suggesting a cause-and-effect relationship. Beyond India multiproxy studies also place the main Deccan phase in the uppermost Maastrichtian C29r below the KTB (planktic foraminiferal zones CF2-CF1), as indicated by a rapid shift in 187Os/186Os ratios in deep-sea sections from the Atlantic, Pacific and Indian Oceans, coincident with rapid climate warming, coeval increase in weathering, a significant decrease in bulk carbonate indicative of acidification due to volcanic SO2, and major biotic stress conditions expressed in species dwarfing and decreased abundance in calcareous microfossils (planktic foraminifera and nannofossils). These observations indicate that Deccan volcanism played a key role in increasing atmospheric CO2 and SO2 levels that resulted in global warming and acidified oceans, respectively, increasing biotic stress that predisposed faunas to eventual extinction at the KTB.
Year of Publication: 2013
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Alkaline earth metals; Archosauria; Asia; Assemblages; Atlantic Ocean; Blake Nose; Blake Plateau; Cauvery Basin; Cenozoic; Chordata; Cretaceous; DSDP Site 525; Deccan Traps; Deep Sea Drilling Project; Demerara Rise; Diapsida; Dinosaurs; Equatorial Atlantic; Foraminifera; IPOD; India; Indian Peninsula; Invertebrata; Isotope ratios; Isotopes; K-T boundary; Krishna-Godavari Basin; Leg 113; Leg 171B; Leg 207; Leg 74; Lithostratigraphy; Lower Paleocene; Maud Rise; Mesozoic; Metals; Microfossils; Nannofossils; North Atlantic; Northwest Atlantic; O-18/O-16; ODP Site 1050; ODP Site 1258; ODP Site 690; Ocean Drilling Program; Os-188/Os-187; Osmium; Oxygen; Paleocene; Paleoecology; Paleogene; Planktonic taxa; Plantae; Platinum group; Protista; Reptilia; South Atlantic; Southern Ocean; Sr-87/Sr-86; Stable isotopes; Stratigraphic boundary; Strontium; Tertiary; Tetrapoda; Upper Cretaceous; Vertebrata; Volcanism; Walvis Ridge; Weddell Sea; West Atlantic
Coordinates: N092600 N092600 W0544400 W0544400
N300600 N300600 W0761406 W0761406
S650938 S650937 E0011218 E0011218
S290415 S290414 E0025908 E0025907
Record ID: 2016055539
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