Consistent detachment of supracrustal rocks from a fixed subduction depth in the Cyclades [PDF]
Earth and Planetary Science Letters, 2022 While subduction zones recycle Earth's crust back into the mantle, high pressure metamorphic rocks exposed at the surface testify to occasional crustal subduction failure. Balancing the budget of Earth's recycling factory requires a fundamental comprehension of how and when some crustal rocks are returned to the surface.
Bertram Uunk +6 more
openaire +4 more sources
Paleozoic supracrustal rocks near Cheticamp, Nova Scotia [PDF]
Atlantic Geology, 1982 Near Cheticamp, northwestern Cape Breton Island, a sequence of supracrustal rocks overlies and cuts granite previously dated at 530±44 million years, as veil as older, presumably Precambrian gneisses. Rhyolite dikes feeding the supracrustal sequence yielded zircons giving a U-Pb discordia age of 439±7 million years (late Ordovician or Silurian).
Currie, K. L.
core +4 more sources
Geochemistry and tectonic setting of the supracrustal rocks from the central part of the Bundelkhand craton, India [PDF]
JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2019 Supracrustal rocks (mafics and ultramafics) occurs along with banded iron formation, and felsic volcanics around Babina, Dhaura, and Mauranipur linear east-west trends in central part of the Bundelkhand craton represent Archean crust.
M. M. Singh, Vinod K. Singh
doaj +2 more sources
Greenstone burial–exhumation cycles at the late Archean transition to plate tectonics [PDF]
Nature Communications, 2022 Supracrustal rocks of the Yilgarn orogen underwent deep burial, and later syn-shortening exhumation. Archean exhumation processes were likely less efficient that today, so that complete exhumation of high-pressure rocks was rare and accidental.
Zibra Ivan +11 more
doaj +2 more sources
Age of the Tokkalehto metagabbro and its significance to the lithostratigraphy of the early Proterozoic Kuusamo supracrustal belt, northern Finland [PDF]
Bulletin of the Geological Society of Finland, 2001 The c. 30-km2 Tokkalehto metagabbro and associated sills and dykes intrude a large part of the western part of the early Proterozoic Kuusamo supracrustal belt in northern Finland. These rocks have previously been mapped as a metavolcanic unit, Greenstone
P.M. Evins, K. Laajoki
doaj +2 more sources
Insights into early continental crust formation from the most ancient heart of Scotland [PDF]
Nature CommunicationsThe paucity of rocks from Earth’s first billion years (4.5–3.5 Ga) limits understanding of early felsic (continental) crust formation and craton development.
Silvia Volante +11 more
doaj +2 more sources
Precambrian crustal evolution and Cretaceous–Palaeogene faulting in West Greenland: Pre-Nagssugtoqidian crustal evolution in West Greenland: geology, geochemistry and deformation of supracrustal and granitic rocks north-east of Kangaatsiaq [PDF]
Geological Survey of Denmark and Greenland Bulletin, 2006 The area north-east of Kangaatsiaq features polyphase grey orthogneisses, supracrustal rocks and Kangaatsiaq granite exposed within a WSW–ENE-trending synform.
Watt, Gordon R., Moyen, Jean-Francois
doaj +1 more source
A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex [PDF]
, 1986 A regional study of highly metamorphosed supracrustal rocks was undertaken in the western portions of the Namaqualand Metamorphic Complex. The study area was essentially restricted to a north-south section some 50 kilometres wide and 220 kilometres long.
Moore, John Michael
core +3 more sources
Geosystems and GeoenvironmentThe mineral chemistry of Fe-Mg biotite has served as an aid to the petrogenesis of igneous rocks, especially for identifying the parent magma compositions. Though the interpretation of igneous and metamorphic processes utilizing biotite mineral chemistry
Parita K. Gorania +4 more
doaj +2 more sources
Multi-method characterization of rare blue quartz-bearing metavolcanic rocks of the Rio dos Remédios Group, Paramirim Aulacogen, NE Brazil [PDF]
Brazilian Journal of Geology, 2023 The Rio dos Remédios Group comprises a supracrustal sequence that occupies the base of the Espinhaço Supergroup, São Francisco Craton, Brazil. Its basal formation, Novo Horizonte, crops out in the Paramirim region mainly as metavolcanic rocks that ...
Danielle Cruz da Silva +4 more
doaj +1 more source