Results 61 to 70 of about 31,446 (282)

The role of biology in planetary evolution: cyanobacterial primary production in low‐oxygen Proterozoic oceans

open access: yesEnvironmental Microbiology, 2015
Summary Understanding the role of biology in planetary evolution remains an outstanding challenge to geobiologists. Progress towards unravelling this puzzle for Earth is hindered by the scarcity of well‐preserved rocks from the Archean (4.0 to 2.5 Gyr ...
T. Hamilton, D. Bryant, J. Macalady
semanticscholar   +1 more source

Carbonate sedimentology: An evolved discipline

open access: yesThe Depositional Record, Volume 12, Issue 1, February 2026.
Abstract Although admired and examined since antiquity, carbonate sediment and rock research really began with Charles Darwin who, during a discovery phase, studied, documented and interpreted their nature in the mid‐19th century. The modern discipline, however, really began after World War II and evolved in two distinct phases.
Noel P. James, Peir K. Pufahl
wiley   +1 more source

Sedimentary records of palaeohydrological variability during the Late Holocene in the Lower Narmada Basin, western India

open access: yesThe Depositional Record, Volume 12, Issue 1, February 2026.
Late Holocene palaeohydrological changes in the lower Narmada Basin, India, revealed using multiproxy analyses of the Orsang River terrace sediments. Distinct depositional phases corresponding to global climatic events were recorded. High‐magnitude floods in the Narmada River during the MWP, and within the tributary Orsang River during DACP and LIA ...
Alpa Sridhar   +9 more
wiley   +1 more source

Comparison of early precambrian structural-material complexes minerageny of Ukrainian Shield and western equatorial Africa shields (Angolan, Mayombo, Casai)

open access: yesМінеральні ресурси України, 2015
Minerageny of Early-Precambrian structural-lithological complexes (SLC) of the Ukrainian shield (USh) and also Angola, Mayombe, Kasai shields in the western part of Equatorial Africa is described.
A. S. Voynovskiy
doaj  

Geological and isotope-geochemical criteria of evident presence of ancient continental crust in Primorye basement

open access: yesЛитосфера, 2018
The totality of structural-tectonic, lithologic-mineralogical, isotope-geochemical data on the geology of Primorye and adjacent territories of Northeast China and the Amur Region allows us to justify the criterions for the existence of an ancient sialic ...
Sergei O. Maksimov   +2 more
doaj   +1 more source

Diverse morphologies found in living microbial mats and associated microbialites—A field report from the alkaline and hypersaline Nuoertu Lake, Badain Jaran Desert, N‐China

open access: yesThe Depositional Record, Volume 12, Issue 1, February 2026.
Diverse living microbial communities showing stacked mats and finger‐like branching examples that grow with the support of reed grass (phytomicrobialites) as well as aragonitic stromatolitic tufa have been rediscovered in the alkaline and hypersaline Lake Nuoertu in the Badain Jaran Desert N. China.
S. V. Hohl   +3 more
wiley   +1 more source

On peculiarities of composition and properties of ancient hydrocarbon source rocks

open access: yesЗаписки Горного института
Precambrian rocks are widespread within all continents of the Earth; that said, sedimentary associations of these deposits are of special interest in search for oil and gas fields.
Mariya A. Bolshakova   +2 more
doaj  

Lithospheric Delamination Below the North American Midcontinent Ceased Subsidence in Cratonic Basins

open access: yesAGU Advances, Volume 7, Issue 1, February 2026.
Abstract Cratonic lithospheres carry a long history of tectonic modifications that result in heterogeneous structures, as revealed by an increasing number of geophysical observations. The existence of cratonic basins indicates protracted periods of tectonic modification, causing subsidence within global continental interiors.
Xiaotao Yang   +3 more
wiley   +1 more source

Geochronology of sillimanite-cordierite gneiss Atamanovo series of the South Yenisei Ridge (Russia)

open access: yesЛитосфера, 2017
The paper provides justification of Paleo Archaean age (3221 ± 15 Ma) of the granulite plutonic metamorphism that formed the Kan metamorphic complex of the Archaean crust in the Angara-Kan block of the Siberian craton. The age was defined on the basis of
A. M. Sazonov   +6 more
doaj   +2 more sources

Mid‐Proterozoic Transient Oxygenation Events Linked to Enhanced Continental Chemical Weathering: Evidence From Carbonate Lithium Isotopes

open access: yesGeophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract Potential drivers disrupting mid‐Proterozoic (∼1.8–0.8 Ga) environmental stasis remain poorly constrained. Here we examined carbonate Li isotopes from the ∼1.44 Ga Tieling Formation, North China, to evaluate the effects of continental chemical weathering on coeval oxygenation.
Lei Xu   +12 more
wiley   +1 more source

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