Results 21 to 30 of about 15,483 (211)

Geochemical characteristics and source analysis of crude oil from Archean buried hill JZ25-1S in Liaoxi Low Uplift

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, Xiaoping LUO, Piao WU, Yunlong XU, Jian LUO, Yanxu SUN   +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., Demikhov Yu., Verkhovtsev V., Borisova N., Chuprinova S.   +4 more
doaj   +1 more source

The Archean Nickel Famine Revisited [PDF]

Astrobiology, 2015
Iron formations (IF) preserve a history of Precambrian oceanic elemental abundance that can be exploited to examine nutrient limitations on early biological productivity. However, in order for IF to be employed as paleomarine proxies, lumped-process distribution coefficients for the element of interest must be experimentally ...
Konhauser, Kurt, Robbins, Leslie, Pecoits, Ernesto, Peacock, Caroline, Kappler, Andreas, Lalonde, Stefan   +5 more
openaire   +4 more sources

Archean-Paleozoic zircons in Zealandia

, 2022
Databases of U-Pb detrital zircon ages from Ordovician sandstones and quartzites in Nelson, Fiordland and Stewart Island, South Island New Zealand with have exceptionally high proportions of ages, 2000-3500 Ma, Archean-early Paleoproterozoic.
christopher adams (12236048), Ross Ramsay (12469637)   +1 more
core   +1 more source

TWO EPISODES OF METAMORPHISM IN THE ROCKS OF THE EASTERN KITOI BLOCK (SHARYZHALGAI UPLIFT OF THE SIBERIAN PLATFORM) ACCORDING TO THE GARNET AMPHIBOLITE DATA

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

Modeling the signature of sulfur mass-independent fractionation produced in the Archean atmosphere [PDF]

, 2014
Minor sulfur isotope anomalies indicate the absence of O2 from the Archean atmosphere. A rich dataset showing large variations in magnitude and sign of Δ33S and Δ36S, preserved in both sulfates and sulfides, suggests that further constraints on Archean ...
Claire, Mark, Meadows, Victoria, Domagal-Goldman, Shawn D., Stueken, Eva, Claire, Mark W., Domagal-Goldman, Shawn, Kasting, James F., Stüeken, Eva E., Meadows, Victoria S., Kasting, James, Buick, Roger   +10 more
core   +1 more source

SQUID-SIMS is a useful approach to uncover primary signals in the Archean sulfur cycle [PDF]

, 2014
The Agouron Institute and National Aeronautic and Space Administration Exobiology Award NNX09AM91G supported this work.Many aspects of Earth's early sulfur cycle, from the origin of mass-anomalous fractionations to the degree of biological participation,
Guan, Yunbin, Woodward W. Fischer, Fike, David A., Fike, David A, Jena E. Johnson, Raub, Timothy D, David A. Fike, Fischer, Woodward W., Johnson, Jena E, Eiler, John M, Timothy D. Raub, Raub, Timothy D., Yunbin Guan, Kirschvink, Joseph L., Johnson, Jane E., Joseph L. Kirschvink, John M. Eiler, Fischer, Woodward W, Kirschvink, Joseph L, Eiler, John M.   +19 more
core   +1 more source

Low Temperature Magnetic Properties of the Late Archean Boolgeeda Iron Formation (Hamersley Group, Western Australia): Environmental Implications

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, Aude eIsambert, Hélène eBouquerel, Ernesto ePecoits, Pascal ePhilippot, Emmanuelle eVennin, Magali eAder, Christophe eThomazo, Jean-François eBuoncristiani, Franck eBaton, Elodie eMuller, Damien eDeldicque   +11 more
doaj   +1 more source

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