Results 131 to 140 of about 8,887 (226)

Tectonics of some Amazonian greenstone belts [PDF]

Greenstone belts exposed amid gneisses, granitoid rocks, and less abundant granulites along the northern and eastern margins of the Amazonian Craton yield Trans-Amazonican metamorphic ages of 2.0-2.1 Ga.
Gibbs, A. K.
core   +1 more source

Giant lithium-rich pegmatites in Archean cratons form by remelting refertilised roots of greenstone belts

Communications Earth & Environment
Around 80% of the world’s hard-rock lithium supply comes from pegmatites formed in the Archean Eon, yet our understanding of how Lithium-pegmatites form assumes magma source compositions not relevant to those Archean cratons hosting most of the giant ...
Robert H. Smithies, Yongjun Lu, David C. Champion, Marcus T. Sweetapple, Jack R. Lowrey, Nathan H. Bowman, Kevin F. Cassidy, Tim J. Ivanic, Anthony I. S. Kemp, Rose E. Turnbull, Klaus Gessner, Fawna J. Korhonen   +11 more
doaj   +1 more source

Biosignatures of an ancient bedrock- and impact structure-hosted deep biosphere: current knowledge and future perspectives

Discover Geoscience
The deep biosphere is thought to have dominated life on Earth for most of its history and played a crucial role in the early evolution of both prokaryotes and eukaryotes.
Jacob Gustafsson, Henrik Drake
doaj   +1 more source

Tectonic implications of Archean anorthosite occurrences [PDF]

The occurrences of megacrystic anorthosite and basalt in a variety of geologic settings were reviewed and it was found that these rock types occur in a variety of tectonic settings.
Maczuga, D. E., Morrison, D. A., Phinney, W. C.   +2 more
core   +1 more source

Cyclic growth in Atlantic region continental crust [PDF]

Atlantic region continental crust evolved in successive stages under the influence of regular, approximately 400 Ma-long tectonic cycles. Data point to a variety of operative tectonic processes ranging from widespread ocean floor consumption (Wilson ...
Goodwin, A. M.
core   +1 more source

Petrogenesis of calcic plagioclase megacrysts in Archean rocks [PDF]

Anorthositic complexes with large equidimensional plagioclase grains of highly calcic composition occur in nearly all Archean cratons. Similar plagioclase occur as megacrysts in many Archean sills, dikes, and volcanic flows.
Morrison, D. A., Phinney, W. C.
core   +1 more source

Accretion of the cratonic mantle lithosphere via massive regional relamination. [PDF]

Proc Natl Acad Sci U S A, 2022
Wang Z, Capitanio FA, Wang Z, Kusky TM.
europepmc   +1 more source

The relationship between natural hydrogen flow rates and production viability. [PDF]

Sci Rep
Franke D, Klitzke P, Bagge M, Lutz R, Ostertag-Henning C, Blumenberg M, Thiel C, Bahr A.   +7 more
europepmc   +1 more source

Workshop on the Early Earth: The Interval from Accretion to the Older Archean [PDF]

Presentation abstracts are compiled which address various issues in Earth developmental processes in the first one hundred million years. The session topics included: accretion of the Earth (processes accompanying immediately following the accretion ...
Ashwal, L. D., Burke, K.
core   +1 more source

Protracted circum-continent subduction: A mechanism for craton destruction and a rationale for craton longevity. [PDF]

Proc Natl Acad Sci U S A
Xu X, Zuza AV, Liu L, Zhu W, Sun Y, Wang B, Kuang X, Han S, Zhang X, Zhang W, Fu X, Pearson DG, Liu J.   +12 more
europepmc   +1 more source