Results 81 to 90 of about 39,183 (233)

Animal emergence during Snowball Earths by thermosynthesis in submarine hydrothermal vents [PDF]

open access: yes, 2009
Darwin already commented on the lateness in the fossil record of the emergence of the animals, calling it a valid argument against his theory of evolution^1^.
Anthonie W. J. Muller
core   +2 more sources

Long-term memory of subduction processes in the lithospheric mantle: evidence from the geochemistry of basic dykes in the Gardar Province of South Greenland [PDF]

open access: yes, 2002
The rift-related magmas of the Proterozoic Gardar Igneous Province were emplaced across the contact between the South Greenland Archaean craton and the Palaeoproterozoic Ketilidian mobile belt.
Ellam, R.M.   +2 more
core   +2 more sources

Detrital zircon SHRIMP U-Pb age study of the Cordillera Darwin Metamorphic Complex of Tierra del Fuego : sedimentary sources and implications for the evolution of the Pacific margin of Gondwana [PDF]

open access: yes, 2010
The Cordillera Darwin Metamorphic Complex in the southernmost Andes includes a basement of probable Palaeozoic age, a mid-Jurassic and younger volcano-sedimentary cover, and a suite of Jurassic granites, all of which were jointly metamorphosed during the
Calderon, M.   +6 more
core   +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

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: a review [PDF]

open access: yes, 2005
Igneous rocks of the Devonian Kola Alkaline Carbonatite Province (KACP) in NW Russia and eastern Finland can be classified into four groups: (a) primitive mantle-derived silica-undersaturated silicate magmas; (b) evolved alkaline and nepheline syenites; (
Balaganskaya, E.   +4 more
core   +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  

The formation of Laurentia : Evidence from shear wave splitting [PDF]

open access: yes, 2017
The authors would like to thank A. Walker for invaluable help understanding the MSAT forward modelling code, as well as A. Boyce, L. Petrescu, and C.
Bastow, Ian   +4 more
core   +2 more sources

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

Estratigrafía del Grupo Mina Verdun, Proterozoico de Minas, Uruguay

open access: yesLatin American Journal of Sedimentology and Basin Analysis
El objetivo del presente trabajo es el de presentar un cuadro estratigráfico para las sedimentitas del área del Cerro Verdún, Minas, Uruguay. Asimismo presentar algunas consideraciones sobre sus características sedimentológicas y sus estromatolitos, a ...
Daniel G. Poiré   +3 more
doaj  

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