Results 11 to 20 of about 9,317 (244)

Large Igneous Province Record Through Time and Implications for Secular Environmental Changes and Geological Time‐Scale Boundaries

open access: yesGeophysical Monograph Series, Page 1-26., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst   +8 more
wiley  

+9 more sources

A tectonic model for the juxtaposition of granulite- and amphibolite-facies rocks in the Eburnean orogenic belt (Sassandra-Cavally domain, Côte d’Ivoire)

open access: yesBSGF - Earth Sciences Bulletin, 2023
The Sassandra-Cavally (SASCA) domain (SW Côte d’Ivoire) marks the transition between the Archean Kenema-Man craton and the Paleoproterozoic (Rhyacian) Baoule-Mossi domain.
Koffi Augustin Yao   +9 more
doaj   +1 more source

Constraints over the age of magmatism and subsequent deformation for the Neoarchean Kukkola Gneiss Complex, northern Fennoscandia [PDF]

open access: yesBulletin of the Geological Society of Finland, 2020
The Archean crust in northern Fennoscandia preserves a fragmentary geological record, making direct correlation among Archean domains challenging. This study presents two new zircon U-Pb age determinations from the Archean Kukkola Gneiss Complex (KGC ...
Pietari Skyttä   +6 more
doaj   +1 more source

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

open access: yesShiyou 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

Shale Heavy Metal Isotope Records of Low Environmental O2 Between Two Archean Oxidation Events

open access: yesFrontiers in Earth Science, 2022
Evidence of molecular oxygen (O2) accumulation at Earth’s surface during the Archean (4.0–2.5 billion years ago, or Ga) seems to increase in its abundance and compelling nature toward the end of the eon, during the runup to the Great Oxidation Event. Yet,
Chadlin M. Ostrander   +9 more
doaj   +1 more source

CARBONATES OF ORE DEPOSITS OF PRECAMBRIAN OF THE CENTRAL PART OF THE UKRAINIAN SHIELD

open access: yesГеохімія 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
doaj   +1 more source

Novel Microbial Groups Drive Productivity in an Archean Iron Formation

open access: yesFrontiers in Microbiology, 2021
Deep subsurface environments are decoupled from Earth’s surface processes yet diverse, active, and abundant microbial communities thrive in these isolated environments.
Cody S. Sheik   +13 more
doaj   +1 more source

Biomineralization of primary carbonate cements: a new biosignature in the fossil record from the Anisian of Southern Italy

open access: yesLethaia, 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

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

open access: yesГеодинамика 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

Phase Diagrams of Carbonate Materials at High Pressures, with Implications for Melting and Carbon Cycling in the Deep Earth

open access: yesGeophysical Monograph Series, Page 137-165., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Konstantin Litasov   +3 more
wiley  

+3 more sources

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