Results 71 to 80 of about 11,453 (209)
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.Abstract The cratonic lithospheric mantle records complex metasomatic processes and is frequently tapped by alkaline magmatism, offering a unique opportunity to trace the progressive evolution of the mantle. In the present contribution, we investigate a newly identified calc‐alkaline lamprophyre field from the Neoarchean Jonnagiri Schist Belt, Eastern ...
Sourav Naskar +6 more
wiley +1 more source
The structural relationship between Archean granite–greenstone terrains and late Archean mafic dikes
, 1978 Examples of Archean shield areas from Canada and Australia are used to demonstrate a consistent orthogonality in trend between late Archean mafic dikes (~2.5 Ga old) and the structure of granite–greenstone terrains whose orogenic history terminated no ...
H. C. Halls
core +1 more source
Geochemical environments of the Archean-Proterozoic
Доклады Академии наук, 2019 In the Precambrian section, there is a change of Archean calcite carbonate rocks to magnesia and ferrous in the Proterozoic. This is correlated with the massive development of cyanobacteria, the absorption of which carbon dioxide and the generation of oxygen, led to a change in the acidic reduction conditions of Archaean alkaline oxidizing in the ...
openaire +2 more sources
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 6, June 2026.Abstract Crust formed in volcanic arcs is accreted to continents over geologic time, serving as the source material for new continental crust in Earth's present and recent past. Geochemically, arcs are found to be significantly more mafic than bulk continental crust.
Hannah F. Mark +4 more
wiley +1 more source
Strongly Peraluminous Granites across the Archean–Proterozoic Transition [PDF]
, 2019 Strongly peraluminous granites (SPGs) form through the partial melting of metasedimentary rocks and therefore represent archives of the influence of assimilation of sedimentary rocks on the petrology and chemistry of igneous rocks.
Bucholz, Claire E. +1 more
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Tectonics, Volume 45, Issue 6, June 2026.Abstract The assembly and breakup of the supercontinent Rodinia set the stage for Earth system evolution through the Neoproterozoic Era. Laurentia, the central craton in Rodinia, lacks well‐dated paleomagnetic poles between ca. 990 Ma and 780 Ma. In this study, we develop new U‐Pb petrochronology and thermochronology data sets from zircon, garnet ...
Yiming Zhang +6 more
wiley +1 more source
Archean and Paleoproterozoic cratonic rocks of Baffin Island [PDF]
Archean and Paleoproterozoic cratonic rocks of Baffin Island define four stacked structural levels that are juxtaposed within the middle Paleoproterozoic Trans-Hudson Orogen.
Rayner, N +7 more
core +1 more source
Paleoceanography and Paleoclimatology, Volume 41, Issue 6, June 2026.Abstract The Laurasian Seaway comprises a N‐S oriented trans‐Pangaean corridor linking Tethys to the Boreal Sea during the Jurassic, and direction of water flow has been the subject of considerable debate. The Llanbedr (Mochras Farm) borehole, Cardigan Bay Basin, Wales, is a uniquely informative record that comprises an expanded deep‐marine silty ...
M. Jiang +7 more
wiley +1 more source
Archean sedimentary styles and early crustal evolution
, 1986 The distinctions between and implications of early and late Archean sedimentary styles are presented. Early Archean greenstone belts, such as the Barberton of South Africa and those in the eastern Pilbar Block of Australia are characterized by fresh or ...
Lowe, D. R.
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, 1985 The Lake Plateau area of the Beartooth Mountains, Montana were mapped and geochemically sampled. The allochthonous nature of the Stillwater Complex was interpreted as a Cordilleran-style continental margin.
Kain, L., Mogk, D. W.
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