Results 41 to 50 of about 297,462 (204)

Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana

, 2020
The Palaeoproterozoic Birimian Supergroup of the West African Craton (WAC) consists of volcanic belts composed predominantly of basaltic and andesitic rocks and intervening sedimentary basins composed predominantly of wackes and argillites.
Malaviarachchi, Sanjeewa P. K., Anani, Chris Y., Manu, Johnson, Kwayisi, Daniel, Nude, Prosper M., Su, Ben-Xun, Alemayehu, Melesse, Sakyi, Patrick Asamoah, Su, Ben-Can   +8 more
core   +1 more source

Geology, geochemistry and Sr–Nd constraints of selected metavolcanic rocks from the eastern boundary of the Saharan Metacraton, southern Sudan : a possible revision of the eastern boundary [PDF]

, 2016
Neoproterozoic, Pan-African low-grade metavolcanic rocks and associated mafic and ultramafic rocks of ophiolitic origin have long been identified within the pre-Neoproterozoic Saharan Metacraton (SMC). These low-grade rocks within generally high-grade (
Abdelrahman, E.M., Bumby, Adam John, Eriksson, Patrick George, Ibinoof, M.A., Le Roux, P.J., Grantham, G.H.   +5 more
core   +1 more source

Boninites in the ~3.3 Ga Holenarsipur Greenstone Belt, Western Dharwar Craton, India

Geosciences, 2018
In this contribution, we present detailed field, petrography, mineral chemistry, and geochemistry of newly identified high-Si high-Mg metavolcanic rocks from the southern part of the ~3.3 Ga Holenarsipur greenstone belt in the western Dharwar craton ...
Tarun C. Khanna, V. V. Sesha Sai, S. H. Jaffri, A. Keshav Krishna, M. M. Korakoppa   +4 more
doaj   +1 more source

Supracrustal rocks in the Kuovila area, Southern Finland: Structural evolution, geochemical characteristics and the age of volcanism [PDF]

Bulletin of the Geological Society of Finland, 2005
The supracrustal rocks of the Kuovila area in the Palaeoproterozoic Svecofennian Uusimaa Belt, southern Finland, consist mainly of volcaniclastic rocks associated with banded iron formations (BIFs) and marbles.
P. Skyttä, A. Käpyaho, I. Mänttäri
doaj   +1 more source

Suite of Regional Seismic Velocity Models for the U.S. Atlantic and Gulf Coastal Plains (CPVMv2.0): Incorporating Epistemic Uncertainty in Velocity Models

Earthquake Spectra, Volume 42, Issue 4, November 2026.
The U.S. Atlantic and Gulf Coastal Plain (CP) sediments are kilometers‐thick, low‐velocity deposits underlain by high‐velocity bedrock that create regional patterns of amplification and attenuation of ground motions. Capturing these effects is challenging because of the limited subsurface information available, particularly the shear wave velocity (VS)
Cassie Gann‐Phillips, Ashly Cabas, Chunyang Ji, Oliver Boyd, James Kaklamanos, Chris Cramer   +5 more
wiley   +1 more source

Major element geochemistry of pyroxenes in metavolcanic rocks of IODP Exp366 samples

, 2019
Major element geochemistry of pyroxenes in metavolcanic rocks of IODP Exp366 ...
Bach, Wolfgang, C D Menzies (7885667), Damon A H Teagle (7885670), Klein, Frieder, Lucassen, Friedrich, Teagle, Damon A H, Elmar Albers (7883690), Wolfgang Bach (6960488), Frieder Klein (6966005), Friedrich Lucassen (3704155), Albers, Elmar, Menzies, C D   +11 more
core   +1 more source

The 1.88 Ga Kotalahti and Vammala nickel belts, Finland: Geochemistry of the mafic and ultramafic metavolcanic rocks [PDF]

Bulletin of the Geological Society of Finland, 2009
The mafic and ultramafic volcanic rocks within the Svecofennian (1.88 Ga) Kotalahti and Vammala Nickel Belts, Finland, are spatially associated and coeval with a suite of mineralized mafic-ultramafic intrusions.
S.J. Barnes, H.V. Makkonen, S.E. Dowling, R.E.T. Hill, P. Peltonen   +4 more
doaj   +1 more source

Evaluating Forced Versus Plume‐Induced Subduction Initiation for the Talkeetna‐Bonanza Arc System: Implications for Permo‐Triassic Paleogeography of the North American Cordillera

Tectonics, Volume 45, Issue 9, September 2026.
Abstract The mechanisms by which new subduction zones form remain highly debated. Here we use Permo‐Triassic strata to evaluate potential mechanisms for initiation of the Talkeetna‐Bonanza Arc of the northern North American Cordillera. New mapping and analysis of Permian and Upper Triassic strata on the Alaska Peninsula suggest a period of uplift ...
Brandon M. Keough, Michael P. Eddy, Kenneth D. Ridgway   +2 more
wiley   +1 more source

Metamorphic Reactivity Influences Amphibole Creep Behaviour

Journal of Metamorphic Geology, Volume 44, Issue 8, Page 611-632, September 2026.
ABSTRACT The rheological behaviour of solid‐solution minerals may play an important role in determining how metamorphic crust accommodates deformation. Whether or not a mineral's deformation is diffusion or dislocation‐mediated depends on a range of extrinsic variables such as stress, strain rate and temperature, as well as intrinsic variables such as ...
Alix Osinchuk, Brendan V. Dyck, Jesse B. Walters   +2 more
wiley   +1 more source

Rb/Sr whole rock age determinations on metavolcanic rocks from the Narssarssuaq region, South Greenland

Rapport Grønlands Geologiske Undersøgelse, 1974
In the area of Julianehåb granite along the south-west coast of Greeniand remnants of volcanic rocks are widespread. Well banded, intermediate tuffs occur on Mato and adjacent islands to the west of Julianehåb (Nesbitt, 1961; Allaart, 1967). Intermediate plagioclase-porphyritic rocks occur associated with aplitic gneiss north of Bredefjord.
S Pedersen, J.H Allaart, O Larsen
openaire   +2 more sources