Results 91 to 100 of about 35,079 (237)

Discovery of mafic impact melt in the center of the Vredefort dome:archetype for continental residua of early Earth cratering? [PDF]

, 2014
Melting by impact heating is thought to have been a significant process in the modification of early planetary crusts; however, crustally derived melt bodies in ancient terrestrial crust are frequently presumed to be absent due to erosion.
Barker, I. R., Moser, D. E., Darling, James, Darling, J. R., Bowman, J. R., Cupelli, C. L., Dhuime, B.   +6 more
core   +2 more sources

Coeval large-scale magmatism in the Kalahari and Laurentian Cratons during Rodinia assembly [PDF]

, 2004
We show that intraplate magmatism occurred 1106 to 1112 million years ago over an area of two million square kilometers within the Kalahari craton of southern Africa, during the same magnetic polarity chron as voluminous magmatismwithin the cratonic core
Hanson, Richard E, Hanson, R. E., Dalziel, I. W. D., Gose, Wulf A., Mukwakwami, J., Gose, W. A., Seidel, E. K., Bowring, Samuel A., Ramezani, J., Dalziel, Ian W.D., Seidel, Emily K., Mukwakwami, Joshua, Ramezani, Jahandar, Pancake, J. A., Blenkinsop, Thomas G., Crowley, J. L., Bowring, S. A., Crowley, James L., Blenkinsop, Tom, Pancake, James A.   +19 more
core   +1 more source

Metasomatic/depletion events affecting Cratons and “cratons” [PDF]

ASEG Extended Abstracts, 2019
Tom Wise*,, Stephan Thiel, Rian Dutch, Mark Pawley, Kate Robertson   +4 more
openaire   +1 more source

Cratons Through the Ages: Impact of Rayleigh Number on Craton Shape

, 2023
Cratonic lithosphere contains crucial details about planetary dynamics on Earth and understanding the shape of cratonic lithosphere may provide new insight into their history. Seismic imaging suggests that there are various margin shapes of the present day cratonic lithosphere, including regions with vertical or sloped margins. While prior studies have
openaire   +2 more sources

Lithospheric Structure beneath Southern Africa: Implications for the Formation and Evolution of Cratons [PDF]

, 2000
The southern Africa seismic experiment, a collaboration involving Carnegie Institution, MIT, southern African academic institutions and industry collaborators, has provided detailed information on the tectospheric structure of the southern Africa cratons,
James, David E., Gore, J., Gao, Stephen S., Kaapvaal Seismic Group, VanDecar, J. C., Fouch, Matthew J., van der Lee, S., Nguuri, T.   +7 more
core  

Fast Seismic Anomalies Under Continents Explained by the Delaminated Lower Continental Crust—Implications From High Pressure‐Temperature Elasticity of Jadeite

Geophysical Research Letters
Seismic tomography has shown that the shear wave velocities (Vs) under continents, especially under cratons, are extremely fast at 100–200 km depth, which is difficult to explain by low temperatures or high Mg#. Alternatively, delaminated eclogitic lower
Ming Hao, Wen‐Yi Zhou, Przemyslaw Dera, Brandon Schmandt, Dongzhou Zhang, Jin S. Zhang   +5 more
doaj   +1 more source

Seismic constraints on the assembly of cratons [PDF]

Seismic constraints on the assembly of cratons. Improved definition of the 3-D seismological structure and nature of the major lithospheric blocks in Australia and their assembly to form the present-day continent will be sought from seismological data ...

core  

Secular Changes in the Occurrence of Subduction During the Archean

Geophysical Research Letters
Subduction processes play a pivotal role in facilitating material exchange between the crust and mantle, contributing to the growth of continents. However, the onset and evolution of subduction remain hotly debated.
Chun‐Tao Liu, Chen‐Yang Ye, J. ZhangZhou   +2 more
doaj   +1 more source

Cratons and fold belts of India [PDF]

, 2010
Cratons and Fold Belts of India, is a unique attempt at presenting geological characteristics and evolution of the fold belts and the cratonic areas of the Indian shield.
Sharma Ram, S.
core   +2 more sources

Geological map of Brazil - 2025 (scale 1:5,000,000): Methodology and main geological compartments

Journal of the Geological Survey of Brazil
The Geological Map of Brazil at the 1:5,000,000 scale was recently updated by the Geological Survey of Brazil (SGB-CPRM), in view of the availability of several geological maps and datasets released after the previous version, published in 2001. In this
Vladimir Medeiros, Frank Santos , Marcos Quadros, Elias Espírito Santo , Marcio Silva, Gustavo Moreira, Tiago Barros   +6 more
doaj   +1 more source