Results 41 to 50 of about 16,754 (235)

Exploring the Gravimetric and Geochronological Links in Ancient Terranes of the São Francisco Craton and Borborema Province, NE‐Brazil

open access: yesTerra Nova, EarlyView.
ABSTRACT Deep crustal fragments and structural lineaments identified through satellite gravity data provide evidence for the extension of the reworked ancient basement of the Central African Block into the northern São Francisco Craton and southern Borborema Province.
Douglas Teixeira Martins   +3 more
wiley   +1 more source

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

open access: yesTerra Nova, EarlyView.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito   +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

open access: yesNWIG, 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  

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

open access: yesSeismica
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   +8 more
doaj   +1 more source

A2-Type Granites from the Bastar Craton, South-Central India, and Their Implication in Archean-Paleoproterozoic Tectonics in Indian Peninsula

open access: yesLithosphere, 2022
This communication reports novel geochemical and geochronological data of granite from the southeastern part of the Bastar Craton, Central India. The studied samples are leucocratic in appearance and composed of quartz, K-feldspar, plagioclase feldspar ...
Kausik Satpathi   +5 more
doaj   +1 more source

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

open access: yesGeochemistry, 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

COACH CV: The Seven Clinical Phenotypes of Concussion

open access: yesBrain 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   +2 more
doaj   +1 more source

Episodic crustal growth in the Tanzania Craton: evidence from Nd isotope compositions

open access: yesChina Geology, 2018
: The analysis of available Nd isotope data from the Tanzania Craton places important constraints on the crust-mantle separation ages, and events marking juvenile crustal addition and crustal recycling. Nd model ages date the oldest crust extraction to 3.
Kai Sun   +7 more
doaj   +1 more source

Essence of the Late Mesozoic ore-magmatic systems of Aldan Shield

open access: yesЛитосфера, 2016
The original cause of the Late Mesozoic tectonic-magmatic and mineragenic activation at the Pre-Cambrian Aldan Shield was the existence of the stagnated oceanic slab in the mantle transitional zone.
V. G. Khomich, N. G. Boriskina
doaj   +2 more sources

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