Results 41 to 50 of about 34,202 (186)

A new cache of Eoarchaean detrital zircons from the Singhbhum craton, eastern India and constraints on early Earth geodynamics

Geoscience Frontiers, 2019
The dominant geodynamic processes that underpin the formation and evolution of Earth's early crust remain enigmatic calling for new information from less studied ancient cratonic nuclei. Here, we present U–Pb ages and Hf isotopic compositions of detrital
B. Sreenivas, S. Dey, Y. Rao, T. Kumar, E V. S. S. K. Babu, I. Williams   +5 more
semanticscholar   +1 more source

Research Direction and Science Evaluation: The Role of Coherence and Alignment

Journal of Economics &Management Strategy, EarlyView.
ABSTRACT The decisions of funding agencies greatly influence the direction of scientific research; however, our understanding of how applicants' research directions affect the selection process remains limited. In this study, we investigate how a project's coherence with a scientist's previous work and its alignment with current scientific trends ...
Charles Ayoubi, Sandra Barbosu, Michele Pezzoni, Fabiana Visentin   +3 more
wiley   +1 more source

A new 3.59 Ga magmatic suite and a chondritic source to the east Pilbara Craton

Chemical Geology, 2019
The Pilbara Craton, Western Australia hosts one of the best-preserved Paleoarchean granite-greenstone terrains on Earth, and is inferred to have developed on an older (>3.8 Ga), possibly Hadean, continental substrate.
A. Petersson, A. Kemp, A. Hickman, M. Whitehouse, L. Martin, C. M. Gray   +5 more
semanticscholar   +1 more source

Timing of Metamorphism and Deformation in the Neoarchean Quetico Metasedimentary Belt, Superior Craton, Constrained by Garnet Trace‐Element Mapping and Lu–Hf Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The Quetico subprovince of the Superior Province is among the largest metasedimentary belts globally and provides evidence of tectonic processes at play during the final stages of Archean cratonization. Although previous studies have shown that deformation and metamorphism of the 2.7‐Ga turbiditic protolith resulted in regional subvertical ...
Adrian G. Rehm, Antoine Godet, Doug Tinkham, Carl Guilmette, Matthijs A. Smit   +4 more
wiley   +1 more source

Reshuffling the pack : the transition from slavery to other forms of labor in the British Caribbean, ca. 1790-1890

NWIG, 1994
Analysis of a century of (evolutionary) socio-economic transition in the British Caribbean. According to the author, this process demonstrated aspects of a continuum, rather than sharply marked phases and abrupt changes.
Michael J. Craton
doaj  

Late Cretaceous and Early Paleogene Fluid Circulation and Microbial Activity in Deep Fracture Networks of the Precambrian Basement of Western Greenland

Geochemistry, Geophysics, Geosystems
Deep fracture‐hosted fluids of Precambrian bedrock cratons are relatively stagnant over long time spans compared to near‐surface systems. However, episodic events, such as fracture reactivations, transgressions, and deglaciations, may introduce dilute ...
H. Drake, W. R. M. Makahnouk, N. M. W. Roberts, M. Reinhardt, E. Henkemans, S. K. Frape, E.‐L. Tullborg, C. Broman, M. J. Whitehouse, E. Kooijman   +9 more
doaj   +1 more source

THE “CLINOPYROXENE” PALEOGEOTHERM BENEATH THE OBNAZHENNAYA KIMBERLITE PIPE AND THIСKNESS OF LITHOSPHERE UNDER THE KUOYKA FIELD (SIBERIAN CRATON, YAKUTIA)

Геодинамика и тектонофизика, 2022
The mantle paleogeotherm under the Obnazhennaya kimberlite pipe (Kuoika field, Siberian craton) was reconstructed using the chemical composition of clinopyroxene xenocrystals and the FITPLOT program.
E. A. Muravjeva, A. M. Dymshits, I. S. Sharygin, A. V. Golovin, A. M. Logvinova, O. B. Oleinikov   +5 more
doaj   +1 more source

Petrography and mineral chemistry of Northeast Africa 053—A remnant of Martian crystal mush

Meteoritics &Planetary Science, EarlyView.
Abstract In Earth's igneous systems, crystal mushes, crystal‐rich frameworks permeated by silicate melt, represent a common and fundamental stage in the evolution of magma bodies. However, whether crystal mushes occur within Martian igneous systems and play a comparable role is unknown. Here, we present a comprehensive petrography and mineral chemistry
Xhonatan Shehaj, Eleonora Ammannito, Giovanni Pratesi   +2 more
wiley   +1 more source

Opportunities for targeted, small‐scale law reform in marine and coastal restoration

Restoration Ecology, EarlyView.
Across the globe, law reform is being considered as a mechanism to support, guide, and encourage the upscaling of ecological restoration. While high‐profile examples like the European Nature Restoration Law show the value of large‐scale law reform, this scale of law reform will not be feasible or politically tractable everywhere.
Justine Bell‐James, Phillipa McCormack, Nicole Shumway, Alexandra Wawryk   +3 more
wiley   +1 more source

Relationships Between Lithospheric Structures and Rifting in the East African Rift System: A Rayleigh Wave Tomography Study

Geochemistry, Geophysics, Geosystems, 2018
The East African Rift System (EARS) provides a unique location for exploring factors influencing the development and maturation of continental rifting.
A. Adams, J. Miller, N. Accardo
doaj   +1 more source