Results 121 to 130 of about 32,483 (245)
Communications Earth & EnvironmentAround 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 +11 more
doaj +1 more source
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract Topographic highlands commonly develop along convergent plate boundaries through long‐term processes such as subduction and continental collision. However, the pre‐Cenozoic mountain‐building history of deep‐time orogenic systems in northeastern Pangaea remains poorly constrained due to later tectonic overprinting and denudation.
Heng Peng +9 more
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract Barite serves as a key proxy for reconstructing paleo‐oceanic productivity and chemistry in modern and ancient marine sediments. Although contemporary barite precipitation involves biological mediation, the mechanisms responsible for ancient barite formation remain unclear.
Shiqi Cheng +5 more
wiley +1 more source
Nature of the Coast Batholith, Southeastern Alaska: Are there Archean analogs [PDF]
The comparison of Phanerozoic Andean margins and their possible Archean analogs was made. Geochemical and isotopic data was presented for the episodic intrusion of the elongate, continental margin Coast batholith of southeastern Alaska and British ...
Arth, J. G., Barker, Fred
core +1 more source
The rock components and structures of Archean greenstone belts: An overview [PDF]
Knowledge of the character and evolution of the Earth's early crust is derived from the studies of the rocks and structures in Archean greenstone belts.
Byerly, G. R., Lowe, D. R.
core +1 more source
Origin and evolution of the Amazonian craton [PDF]
The Amazonian craton appears to be formed and modifed by processes much like those of the better-known Precambrian cratons, but the major events did not always follow conventional sequences nor did they occur synchronously with those of other cratons ...
Gibbs, A. K., Wirth, K. R.
core +1 more source
Speculations on nature and extent of Archean basement in Labrador as indicated by SR, ND and PB isotopic systematics of proterozoic intrusives [PDF]
The Sm-Nd and Rb-Sr isotopic compositions of mid to late Proterozoic (approximately 1.6 to 1.1 Ga) massif-type anorthosites and mafic intrusives in the eastern Canadian shield are correlated with geographic location.
Ashwal, L. D. +2 more
core +1 more source
Algal blooms as biofilm analogues: Evolutionary insights into cyanobacterial adaptation
Limnology and Oceanography Letters, Volume 11, Issue 3, May 2026.
Hidetoshi Urakawa, Hans W. Paerl
wiley +1 more source
Stored mafic/ultramafic crust and early Archean mantle depletion [PDF]
Both early and late Archean rocks from greenstone belts and felsic gneiss complexes exhibit positive epsilon(Nd) values of +1 to +5 by 3.5 Ga, demonstrating that a depleted mantle reservoir existed very early.
Chase, Clement G., Patchett, P. J.
core +1 more source
Rhyolitic components of the Michipicoten greenstone belt, Ontario: Evidence for late Archaen intracontinental rifts or convergent plate margins in the Canadian Shield? [PDF]
Rhyolitic rocks often are the dominant felsic end member of the biomodal volcanic suites that characterize many late Archean greenstone belts of the Canadian Shield.
Attoh, K. +2 more
core +1 more source