Results 51 to 60 of about 35,079 (237)

Noroeste da África – Nordeste do Brasil (Província Borborema) Ensaio comparativo e problemas de correlação [PDF]

Geologia USP. Série Científica, 2001
A correlação geológica entre as porções Noroeste da África e Nordeste do Brasil enfrentam ainda uma série de problemas, de natureza virtual e real. A falta de um Projeto Internacional de Correlação Geológica (PICG) voltada para este tema é um aspecto ...
Allen H. Fetter, William R. Van Schmus, Benjamim B. Brito Neves   +2 more
doaj   +3 more sources

Paleomagnetism of ca. 2.13–2.11 Ga Indin and ca. 1.885 Ga Ghost dyke swarms of the Slave craton: Implications for the Slave craton APW path and relative drift of Slave, Superior and Siberian cratons in the Paleoproterozoic [PDF]

, 2016
Of ∼35 Archean cratons that have been identified around the globe, only one, the Superior craton of the Canadian Shield, has a reasonably well-defined apparent polar wander (APW) path for much of Paleoproterozoic time based on ‘key’ (i.e., well-defined ...
K. Buchan, Ross N. Mitchell, W. Bleeker, Michael A. Hamilton, A. LeCheminant   +4 more
semanticscholar   +2 more sources

Lithospheric Thermal Structure Beneath East Antarctica Derived from Aeromagnetic Anomaly Analysis

Remote Sensing
East Antarctica is composed of a composite Precambrian shield largely covered by a thick ice sheet. Information on the thermal structure of the East Antarctic lithosphere is critical to the understanding of the geological history and ice sheet dynamics ...
Fei Ji, Jian Wang, Zeren Zhima, Xiaolei Tu, Weifeng Hao   +4 more
doaj   +1 more source

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Do cratons preserve evidence of stagnant lid tectonics

, 2018
Evidence for episodic crustal growth extending back to the Hadean has recently prompted a number of numerically based geodynamic models that incorporate cyclic changes from stagnant lid to mobile lid tectonics.
D. Wyman
semanticscholar   +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

Mantle Anisotropy and Asthenospheric Flow Around Cratons in Southeastern South America [PDF]

, 2018
Dataset of SWS individual measurements from the paper Mantle Anisotropy and Asthenospheric Flow Around Cratons in Southeastern South America, submitted to the Journal of Geophysics International.
Chagas de Melo, Bruna, Chagas de Melo, Bruna (4987952)   +1 more
core   +1 more source

U-Pb age of Kaapvaal craton titanite: geotectonic interpretation and correlation with the Karelian craton

Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2019
The results of dating of Kaapvaal Craton titanite are reported. It is shown that metamorphiczircon, apatite, amphibole and garnet in the Neoarchaean tectono-thermal activation belt in the eastern Swaziland terrane have an age of ca.
Наталья Сергеевна Нестерова, Александр Иванович Слабунов, Наиля Гаптрахмановна Ризванова, Natalya Nesterova, Alexander Slabunov, Nailya Rizvanova   +5 more
doaj   +1 more source

Seismic Anisotropy Analysis Across Southwestern Australia Reveals ENE‐Trending Lithospheric Architecture Linked to Archean Yilgarn Craton Formation

Geochemistry, Geophysics, Geosystems
The southwest region of Western Australia is one of the oldest continental regions on Earth, hosting the Archean Yilgarn Craton, bounded by the Proterozoic Albany‐Fraser and Pinjarra orogens.
M. Gauntlett, C. M. Eakin, N. Bishoyi, P. Zhang, J.‐P. O’Donnell, R. E. Murdie, M. S. Miller, R. Pickle, R. Ebrahimi   +8 more
doaj   +1 more source

Seismic anisotropy and its implication for the formation and evolution of cratons [PDF]

, 2020
My research focuses on understanding seismic anisotropy from the perspective of theoretical development and exploring the upper mantle anisotropic structures beneath the Superior craton and the Yilgarn craton to set constraints to the craton formation ...

core   +1 more source