Tracing impact events in clay samples with iridium anomaly at and above the Cretaceous/Paleogene boundary at Byala, Eastern Bulgaria

Article in Press
Pages: 
pp. 3-16
University of Mining and Geology “St Ivan Rilski”, Boyan Kamenov Str., 1700 Sofia, Bulgaria
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd, 1784 Sofia, Bulgaria
Faculty of Physics and Technology, Plovdiv University “Paisiy Hilendarski”, 24 Tsar Asen Str., 4000 Plovdiv, Bulgaria
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
Maritsa Vegetable Crops Research Institute, 32 Brezovsko Shose Blvd, 4003 Plovdiv, Bulgaria
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
Abstract: 

Elemental composition of two groups of 12 clay samples, at and above the Cretaceous/Paleogene (K/Pg) boundary at Byala (Black Sea shore, Eastern Bulgaria), is studied by Neutron Activation Analysis (NAA) in order to trace impact events. Iridium anomaly and a certain set of trace elements, together with biostratigraphic data, point to two possible impact events recorded: the first one (at the K/Pg boundary), linked to the giant Chicxulub impact in Mexico; and a second one (above the K/Pg boundary), possibly linked to the later in age, smaller and closer in distance, Boltysh impact in Ukraine.

Keywords: 

K/Pg boundary, impact events, geochemistry, Ir anomaly, Byala, Eastern Bulgaria

DOI: 
10.52321/GeolBalc.51.3.3

VOLUME 51 (3)/December 2022

University of Mining and Geology “St Ivan Rilski”, Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd, 1784 Sofia, Bulgaria
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Faculty of Physics and Technology, Plovdiv University “Paisiy Hilendarski”, 24 Tsar Asen Str., 4000 Plovdiv, Bulgaria
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Maritsa Vegetable Crops Research Institute, 32 Brezovsko Shose Blvd, 4003 Plovdiv, Bulgaria
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 1419890 Dubna, Russia

Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Faculty of Geology and Exploration, University of Mining and Geology, 1700 Sofia, Bulgaria
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Faculty of Geology and Exploration, University of Mining and Geology, 1700 Sofia, Bulgaria
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Faculty of Geology and Exploration, University of Mining and Geology, 1700 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria