Results 31 to 40 of about 2,667 (188)

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

U-Pb evidence for late Neoarchean crustal reworking in the Southern São Francisco Craton (Minas Gerais, Brazil)

Anais da Academia Brasileira de Ciências, 2003
The Passa Tempo Metamorphic Complex is one of several metamorphic complexes that form the Archean sialic crust of the southern São Francisco Craton. It encompasses hypersthene-bearing gneissic rocks, with subordinateNW- or EW-trending mafic-ultramafic ...
José C.S. Campos, Maurício A. Carneiro, Miguel A.S. Basei   +2 more
doaj   +1 more source

The Earliest Feathers from the Lower Cretaceous Dabeigou Formation of North Hebei: Implications for the Early Evolution of the Jehol Biota

Integrative Zoology, EarlyView.
This study reports two isolated feather fossils from the Lower Cretaceous Dabeigou Formation in northeastern China. Morphological analyses identified them as the earliest known feathered theropods (potentially including avian) in the Jehol Biota. This finding reveals a complex ecosystem at the dawn of the Jehol Biota, bridging the temporal and faunal ...
Qian Wu, Qian‐Nan Zhang, Dang‐Peng Xi   +2 more
wiley   +1 more source

(Ultra)high‐Pressure Metamorphism in Sedimentary Versus Basaltic Rocks: Insights From a Variscan Mélange in the South Carpathians

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Reconstructing the pressure–temperature–time (P–T–t) evolution of (ultra)high‐pressure rocks is essential for constraining subduction and collisional dynamics. Subduction zones are often investigated using basic eclogites, whereas nonbasic high‐pressure rocks remain comparatively understudied, potentially hindering a comprehensive ...
Otavio S. G. Silva, Bruno V. Ribeiro, Gavril Săbău, Fabricio Caxito, Paulo A. de Paiva‐Silva, Pierre Lanari, George Luvizotto, Mahyra Tedeschi   +7 more
wiley   +1 more source

The Deep Lithospheric Structure of the South Australian Craton Revealed by Teleseismic Rayleigh Wave Tomography

Seismica
We used teleseismic Rayleigh waves recorded by three recent broadband seismic arrays in southern Australia to develop a shear wave velocity model of the South Australian Craton from the lower crust to 250 km depth and compare this with isotope data ...
John Paul O'Donnell, Kate Selway, Claire Wade, Stephan Thiel, Caroline Eakin, Robert Pickle, Shubham Agrawal, Bruce Goleby, Alexei Gorbatov   +8 more
doaj   +1 more source

Craton Destruction Induced by Drastic Drops in Lithospheric Mantle Viscosity

Earth and Space Science, 2022
The disruption of the mantle roots of cratons is common after cratonization. Craton destruction, which is characterized by severe lithospheric thinning, extensive thrust and extensional deformation, basin filling, and intense thermal activities, is ...
Lu Wang, Jia Liu, Qi‐Hu Xu, Qun‐Ke Xia   +3 more
doaj   +1 more source

Response to Pieter C. Emmer’s ‘Reconsideration’

NWIG, 1995
[First paragraph] Criticisms, however strongly expressed, are valuable where they extend and deepen debates. Pieter Emmer's critique, though, is so ill focused, ill informed, and intemperate, that it is difficult to know how to respond profitably ...
Michael J. Craton
doaj  

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

COACH CV: The Seven Clinical Phenotypes of Concussion

Brain Sciences, 2017
Our understanding of the diverse physiological manifestations of concussion is changing rapidly. This has an influence on the clinical assessment of patients who have sustained a concussion. The 2017 Consensus Statement on Concussion in Sport states that
Neil Craton, Haitham Ali, Stephane Lenoski   +2 more
doaj   +1 more source