Metallic iron in sediments at the Mesozoic-Cenozoic (K/T) boundary

Pechersky, D. M.

doi:10.2205/2008es000304

Cited by 3 publications

(3 citation statements)

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“…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

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

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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“…However, the present paper addresses another question. In our investigations, we encountered such material as particles of metallic iron and nickel, and then, the idea emerged to apply the thermomagnetic analysis (TMA) for an extensive study of the distributions of iron particles (Pechersky, 2008;Pechersky, Nurgaliev, and Trubikhin, 2008;Pecherskii et al, 2011). Actually, cosmic dust has long since been studied.…”

Section: Introductionmentioning

confidence: 99%

Thermomagnetic evidence of native iron in sediments

Pechersky

Sharonova

2012

Izv., Phys. Solid Earth

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The paper summarizes the results of thermomagnetic analysis concerning the distribution of metallic iron in the sediments ranging in age from Miocene to Early Cretaceous sampled from the following sections: Gams (Austria); Verkhorech'e and Sel'bukhra (the Crimea); Kvirinaki and Tetritskaro (Georgia); Aimaki, Dzhengutai, Madzhalis, and Gergebil (Ciscaucasia, Russia); Klyuchi and Teplovka (Volga region, Russia); Koshak (Kazakhstan); and Khalats and Kara Kala (Turkmenia). Small amounts of native iron (from 10 -5 % to 0.05%) are identified in 521 samples of 921 studied; i.e., iron particles are almost pervasive. This fact traces the origin of these particles to cosmic dust. Some established features point to the heterogeneous char acter of the cosmic dust: (a) the samples clearly fall into two groups. One group comprises the rocks that con tain iron particles; the rocks of the other group are iron free. In the first group, four intervals are distinguished where the sediments are globally enriched with iron with constant nickel content (5-6%); (b) in terms of composition, the iron particles are divided into three groups. The first group contains pure iron; the particles pertaining to the second group contain iron with a minor amount of nickel typical for kamacite; and the third group comprises the particles of Fe Ni alloy with more than 20% nickel. The first and the second groups are ubiquitous; the particles of the third group are spread locally. They bear no relation to cosmic dust and are probably associated with the meteoritic impacts.

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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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Metallic iron in sediments at the Mesozoic-Cenozoic (K/T) boundary

Cited by 3 publications

References 6 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

Thermomagnetic evidence of native iron in sediments

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

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