The K/T Boundary of Gams (Eastern Alps, Austria) and the Nature of Terminal Cretaceous Mass Extinction

Grachev, A. F.; Kollmann, Heinz A.; Korchagin, O. A.; Pechersky, D. M.; Tselmovich, V. A.

doi:10.2205/2009-gamsbook

Cited by 14 publications

(9 citation statements)

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“…связана с мощным плюмовым вулканизмом в это время [Grachev et al, 2009], к тому же глобальное вымирание -это достаточно длительный процесс, чтобы объяснить его одним ударом астероида, пусть даже огромного. Кроме того, оказалось, что этот астероид упал на Землю раньше границы Mz/Kz на 0.3 млн лет [Keller, 2008].…”

Section: Introductionunclassified

“…По данным многочисленных исследований в пылевых облаках, в атмосфере, в кернах льда из Антарктиды и Гренландии, в океанских пелагических осадках обнаруживаются частицы космической пыли, содержащей частицы самородного железа и никеля. Такие частицы, предположительно космического происхождения, чаще в форме шариков, реже в форме чешуек, впервые обнаружены в глубоководных океанских осадках и марганцевых конкрециях, а впоследствии и в других осадках [Murray, Renard,1891;Грачев и др.,2008;Brownlee,1985;Fredriksson, Martin, 1963;Grachev et al,2009;Parkin et al,1980;и др.]. Данные о распределении этих частиц как по поверхности Земли, так и во времени, носят весьма ограниченный характер, т. к. использовались лишь «прямые» методы фиксации таких частиц, как, например, электронная микроскопия и т. п., которые обычно требуют большой объем исследуемого материала и весьма трудоемки.…”

Section: Introductionunclassified

“…Тогда и возникла идея применить для массового изучения распространения частиц самородного железа ранее не применявшийся для этой цели термомагнитный анализ с нагревом до 800 °С. К настоящему времени накоплен достаточно большой объем данных о распространении частиц самородного железа в земных и внеземных породах и метеоритах [Антипин и др., 2014; Грачев и др., 2009; Марков и др., 2015; Мурдмаа и др., 2015; Печерский, 2008;2015;Печерский и др., 2006;2010;2011;2013;2017;2018;Печерский, Кузина, 2015;Печерский, Шаронова, 2012;2013;Цельмович и др., 2015;Grachev et al,2009;Pechersky, 2008;2010;Pechersky et al,2006;2010;и др. ].…”

Section: Introductionunclassified

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The history and state-of-the-art of the studies of native iron in terrestrial and extraterrestrial rocks

Pechersky

Markov

2019

Физика Земли

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A brief review on the history of studying native iron in terrestrial rocks and meteorites is presented. The synthesis and systematization of extensive data on the distribution, composition, and grain size of metal iron particles in sediments, other terrestrial rocks, and meteorites obtained by thermomagnetic analysis with heating to 800 °C combined with microprobe analysis are described. The studies show that ironparticles in all the studied sediments typically have extraterrestrial origin. Based on the statistical analysis of the thermomagnetic data, a number of indications (statistical regularities) are proposed testifying to the overwhelmingly extraterrestrial origin of iron particles in sediments. The similarity of the formation conditions of terrestrial and extraterrestrial metal iron particles makes it possible to suggest a petromagnetic scheme for the structure of planets based on the distribution of metal iron in them.

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Section: Introductionunclassified

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The history and state-of-the-art of the studies of native iron in terrestrial and extraterrestrial rocks

Pechersky

Markov

2019

Физика Земли

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“…Modern data on distribution of native iron and nickel in the cosmic dust is rather limited, since only "direct" methods of detecting such particles were used. Thermomagnetic analysis (TMA) up to 800ºC was employed during petromagnetic (rock-magnetic) studies of sediments [1][2][3][4][5][6][7]. The increase of ТMA temperature interval by 100 о has given the chance to observe a detailed picture of a distribution of metallic iron in space and time.…”

Section: Introductionmentioning

confidence: 99%

Metallic Iron and Nickel in Cretaceous and Cenozoic Sediments: The Results of Thermomagnetic Analysis

Pechersky¹

2010

JEP

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With the aid of thermomagnetic analysis (TMA) up to 800ºС the composition and distribution of particles of native iron and Fe-Ni alloy was studied in 15 sections, Gams (Austria), Verhorechie and Selbuhra (Crimea), Kvirinaki and Tetritskaro (Georgia), Aimaki, Bass, Dzhengutaj, Madzhalis and Gergebil (North Caucasus, Russia), Klyuchi and Tep-lovka (Volga Region, Russia), Koshak (Kazakhstan), Kara-Kala and Khalats (Turkmenistan). The age of sediments varies from Miocene to Early Cretaceous. Iron particles are present at 521samples out of 921studied. Their percentage varies from 10-5% to 0.05%. The distribution consists of two groups: 1) “zero” group (iron is not found by TMA); 2) group of logarithmic normal distribution with a differing modes. The global enrichment by iron particles in synchronous deposits of Miocene, Maastrichtian-Danian, Santonian and Cenomanian was discovered. With respect to nickel content, the iron particles fall into two groups: 1) nearly pure iron without nickel; and 2) iron with nickel content up to 20%, with modal value of 5%. The source of iron particles is the cosmic dust. Particles of pure nickel and the alloy containing more of 20% of nickel are very rare. Possibly, such particles are related mainly with impact events. A peak of elevated iron content with nearly constant nickel of 5-6% was found in almost all studied sections. It is a global effect which is not dependent of place and time of deposition of iron particles

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“…The K -Pg boundary has been identified at the Furlo and Petriccio outcrops, based on the presence of siderophile-rich magnetic spheroids (Smit & Kyte 1984). Other sequences in the Tethys that contain the K -Pg boundary have been described at Forrada in Italy (Fornaciari et al 2007), at Padriciano, Italy and Dolenja Vas in Slovenia (Ogorelec et al 2007;Tewari et al 2007), Rotwandgraben (Peryt et al 1997), Elendgraben (Preisinger et al 1986) and Gams in Austria (Egger et al 2009;Grachev 2009), and at Uzgrun in the Czech Republic (Bubik et al 1999), as well as in Bulgaria (Preisinger et al 1993;Sinnyovsky & Stoykova 1994;Peybernès et al 2004).…”

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confidence: 99%

The Cretaceous–Paleogene boundary in the East Carpathians, Romania: evidence from geochemistry, mineralogy and calcareous nannofossils

Bojar

2013

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We performed detailed geochemical, mineralogical and calcareous nannofossils investigations on two Maastrichtian -Paleocene sections situated in the Eastern Carpathians, Romania. One of the sections is situated in the Carpathian bend area, in the Ialomiţa Valley and is composed of red marine hemipelagic sediments. The other section is located in the northern region of the Eastern Carpathians, along Varniţa Brook and consists mainly of turbidites. In both sections, the Cretaceous -Paleogene (K-Pg) boundary is characterized by nannoplankton mass extinction (over 90%) of the Cretaceous nannofloras, followed by blooms of survivor taxa, such as the calcareous dinoflagellate genus Thoracosphaera and the nannofloral species Braarudosphaera bigelowii. In the Ialomiţa section, the K-Pg boundary is marked by a drop in calcite and TOC content, as well as a negative excursion in the d 13 C values of organic material. These trends are only partly present in the Varniţa Brook section, where both calcite and TOC content show a decrease, but no negative excursion is seen in the d 13 C values of organic material.

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The K/T Boundary of Gams (Eastern Alps, Austria) and the Nature of Terminal Cretaceous Mass Extinction

Cited by 14 publications

References 291 publications

The history and state-of-the-art of the studies of native iron in terrestrial and extraterrestrial rocks

The history and state-of-the-art of the studies of native iron in terrestrial and extraterrestrial rocks

Metallic Iron and Nickel in Cretaceous and Cenozoic Sediments: The Results of Thermomagnetic Analysis

The Cretaceous–Paleogene boundary in the East Carpathians, Romania: evidence from geochemistry, mineralogy and calcareous nannofossils

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