Results 21 to 30 of about 32,483 (245)
Shiyou shiyan dizhi, 2020 The physical properties, group composition, stable carbon isotope, and biomarker compound distribution characteristics of crude oil in the Archean buried hill were studied and compared with the geochemical characteristics of Paleogene crude oil, in order
Tingting ZHAO +5 more
doaj +1 more source
Precambrian tsunamis in the light of the modern data
Известия высших учебных заведений: Геология и разведка, 2023 Background. In the geological history of the Earth, tsunami events attract particular research attention. Such events are assumed to have taken place already since the Precambrian period.
D. A. Ruban
doaj +1 more source
CARBONATES OF ORE DEPOSITS OF PRECAMBRIAN OF THE CENTRAL PART OF THE UKRAINIAN SHIELD
Геохімія техногенезу, 2020 The article presents the results of study of the isotopic composition of oxygen and carbon of carbonates in ore deposits of the Early Pre-cambrian of the Ukrainian Shield. The following objects were studied: 1. Iron ore formations of the Kryvyi Rih ultra-
Fomin Yu. +4 more
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Lethaia, EarlyView., 2021 Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido +4 more
wiley +1 more source
Геодинамика и тектонофизика, 2020 The Archean metamorphism in the southwestern Siberian craton was confirmed by the studies of the Kitoy and Irkutsk blocks. However, the parameters of the metamorphism process are still poorly investigated.
V. P. Sukhorukov, V. B. Savel'eva
doaj +1 more source
Frontiers in Earth Science, 2015 The origin of the iron oxides in Archean and Paleoproterozoic Banded Iron Formations is still a debated question. We report low and high temperature magnetic properties, susceptibility and saturation magnetization results joined with scanning microscope ...
Julie eCarlut +11 more
doaj +1 more source
Recombination Reactions as a Possible Mechanism of Mass-Independent Fractionation of Sulfur Isotopes in the Archean Atmosphere of Earth [PDF]
, 2017 A hierarchy of isotopically substituted recombination reactions is formulated for production of sulfur allotropes in the anoxic atmosphere of Archean Earth.
Babikov, Dmitri
core +2 more sources
2200 million years of crustal evolution: The Baltic Shield [PDF]
Bulletin of the Geological Society of Finland, 1986 The crustal history of the Baltic shield is interpreted in the light of the plate tectonic concept. Five tectonic cycles, each characterized by special lithological and structural features, are distinguished: The Early Archean (> 2900 Ma), the Late ...
G. Gaál
doaj +1 more source
Drilling for the Archean Roots of Life and Tectonic Earth in the Barberton Mountains [PDF]
Scientific Drilling, 2009 In the Barberton Scientific Drilling Program (BSDP) we successfully completed three drill holes in 2008 across strategically selected rock formations in the early Archean Barberton Greenstone Belt, South Africa.
Nicola McLoughlin +3 more
doaj +1 more source
Evidence for a reducing Archean ambient mantle and its effects on the carbon cycle [PDF]
, 2016 Chemical reduction-oxidation mechanisms within mantle rocks link to the terrestrial carbon cycle by influencing the depth at which magmas can form, their composition, and ultimately the chemistry of gases released into the atmosphere.
Aulbach, Sonja, Stagno, Vincenzo
core +1 more source