Results 51 to 60 of about 8,887 (226)

Eclogite Varieties and Their Positions in the Cratonic Mantle Lithosphere beneath Siberian Craton and Archean Cratons Worldwide

Minerals, 2022
The pressure-temperature (PT) conditions and position of different groups of eclogites in the sub-cratonic lithospheric mantle (SCLM) worldwide were established using clinopyroxene Jd-Di and garnet thermobarometry. Beneath Siberia, Fe-eclogites found within the 3.0–4.0 GPa formed in Early Archean times.
Ashchepkov, Igor, Logvinova, Alla, Spetsius, Zdislav, Downes, Hilary, Ntaflos, Theodoros, Ivanov, Alexandr, Zinchenko, Vladimir, Kostrovitsky, Sergey, Ovchinnikov, Yury   +8 more
openaire   +3 more sources

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

Tectonics-mineralisation relationships within weak continental lithospheres: a new structural framework for Precambrian cratons

BSGF - Earth Sciences Bulletin, 2018
Many Archaean and Paleoproterozoic cratons show deformation patterns that differ from those observed in modern orogens. On the other hand, they constitute an important part of present-day emerged continents and contain a large part of continental mineral
Gapais Denis
doaj   +1 more source

Probing the edge of the West African Craton:a first seismic glimpse from Niger [PDF]

, 2015
Constraints on crustal and mantle structure of the Eastern part of the West African Craton have to date been scarce. Here we present results of P receiver function and SK(K)S wave splitting analyses of data recorded at IMS array TORD in SW Niger. Despite
Feybesse J.‐L., J.‐Michael Kendall, James Wookey, Jeanette F. Di Leo, Neil D. Selby   +4 more
core   +2 more sources

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

Seismic Evidence for Craton Formation by Underplating and Development of the MLD

Geophysical Research Letters
Inconsistencies between observations from long and short period seismic waves and geochemical data mean craton formation and evolution remains enigmatic. Specifically, internal layering and radial anisotropy are poorly constrained.
Alistair Boyce, Thomas Bodin, Stéphanie Durand, Dorian Soergel, Eric Debayle   +4 more
doaj   +1 more source

Differences and Causal Mechanisms in the Lithospheric Thermal Structures in the Cratons in East China: Implications for Their Geothermal Resource Potential

Energies
The thermal structure of the lithosphere is key to understanding its thickness, properties, evolution, and geothermal resources. Cratons are known for their low heat flow and deep lithospheric roots.
Jinhui Wu, Yibo Wang, Lijuan He, Lijuan Wang, Junpeng Guan, Jun Chen, Zhuting Wang, Yaqi Wang, Shengbiao Hu   +8 more
doaj   +1 more source

African cratonic lithosphere carved by mantle plumes

Nature Communications, 2020
Cratons represent the ancient cores of continental plates and are generally thought to have been stable since the Archean. Here however, the authors combine seismic analysis with kimberlite data to infer complete destruction of cratonic lithosphere in ...
Nicolas Luca Celli, Sergei Lebedev, Andrew J. Schaeffer, Carmen Gaina   +3 more
doaj   +1 more source

Lateral variations in the crustal structure of the Indo-Eurasian collision zone [PDF]

, 2018
We thank Michael Ritzwoller and two anonymous reviewers for constructive comments that have helped improve the manuscript. The majority of the seismic data used in this study were downloaded from IRIS DMC.
Gilligan, Amy, Priestley, Keith
core   +1 more source

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source