Intense acidic volcanism at the Cretaceous-Tertiary boundary

Details Intense acidic volcanism at the Cretaceous-Tertiary boundary Intense acidic volcanism at the Cretaceous-Tertiary boundary

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..94..409j&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 94, no. 3-4, Sept. 1989, p. 409-416.

Computer Science

8

Cretaceous-Tertiary Boundary, Geochemistry, Geochronology, Volcanoes, Chemical Composition, Earth Crust, Sea Water, Strontium Isotopes, Tectonics

Scientific paper

An (Sr-87)/(Sr-86) spike in seawater strontium with an amplitude of 0.0002 and duration of order 2 Ma is superimposed on longer-term variations at the Cretaceous-Tertiary boundary. The anomaly has been attributed to increased continental runoff due either to meteorite impact-related acid rain or sea-level regression. It is speculated that the spike could have resulted from intense, explosive acid volcanism preceding the development of the Deccan traps. A good model, both in tectonic position and geochemical characteristics, for these as yet elusive acidic products is provided by granites in the Seychelles Islands and particularly Mahe.

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