Structural observations and U-Pb mineral ages from igneous rocks at the Archaean-Palaeoproterozoic boundary in the Salahmi Schist Belt, central Finland: constraints on tectonic evolution [PDF]
Bulletin of the Geological Society of Finland, 1999 The study area in Vieremä, central Finland, contains part of Archaean-Palaeoproterozoic boundary. In the east, the area comprises Archaean gneiss and the Salahmi Schist Belt. The rocks of the schist belt are turbiditic metagreywackes, with well-preserved
K. Pietikäinen, M. Vaasjoki
doaj +1 more source
Earth's Earliest Phaneritic Ultramafic Rocks: Mantle Slices or Crustal Cumulates?
Geochemistry, Geophysics, Geosystems, 2022 When plate tectonics initiated remains uncertain, partly because many signals interpreted as diagnostic of plate tectonics can be alternatively explained via hot stagnant‐lid tectonics.
Jiawei Zuo +10 more
doaj +1 more source
Peculiar features of the supracomplexes formation in the Keivy domain
Vestnik MGTU, 2021 The Keivy domain (the northeastern part of the Arctic zone of the Fennoscandian Shield) during the period of the maximum manifestation of the Late Archean collisional processes was overlapped by tectonic allochthons of adjacent microcontinents thrust ...
Kozlov N. E. +3 more
doaj +1 more source
Mixed metamorphic and fluid graphite deposition in Palaeoproterozoic supracrustal rocks of the Lewisian Complex, NW Scotland [PDF]
, 2021 Graphite deposits may form alternatively by metamorphism of sedimentary rocks and from fluids. Both types occur in supracrustal successions within the Lewisian Complex of Northwest Scotland, and similarly in Palaeoproterozoic supracrustal rocks across ...
Brolly, Connor +7 more
core +1 more source
The Himmerkinlahti member: An indicator of intra-karelian erosion within the early Proterozoic Kuusamo Belt, Posio, northern Finland [PDF]
Bulletin of the Geological Society of Finland, 2000 The paper establishes the Himmerkinlahti Member, which is a thin metamorphosed conglomerate-sandstone unit within the middle part of the early Proterozoic (Karelian) supracrustal sequence of the Kuusamo Belt, northern Finland.
K. Laajoki
doaj +1 more source
Geology and Lithogeochemistry of the Supracrustal Sequence and Interlayered Metabasites of NE Santos Dumont Region (MG) [PDF]
Anuário do Instituto de Geociências, 2017 The region near Santos Dumont town consists of a sequence of interlayered metabasic rocks and supracrustal gneisses. Two lithological units were individualized based on geological-structural mapping (1:50,000), petrography and lithogeochemistry: a ...
Renata Hiraga +5 more
doaj +1 more source
Seawater signatures in the supracrustal Lewisian Complex, Scotland [PDF]
, 2022 Marble in the supracrustal rocks of the Lewisian Complex, Tiree, includes chlorine-bearing amphiboles, chlorine-rich apatite, sulphur-rich scapolite, albite and phlogopite, all of which are regarded as evidence for evaporites in other metamorphosed ...
Parnell, John +12 more
core +1 more source
SIMS U-Pb, Sm-Nd isotope and geochemical study of an arkosite-amphibolite suite, Peräpohja Schist Belt: Evidence for ca. 1.98 Ga A-type felsic magmatism in northern Finland [PDF]
Bulletin of the Geological Society of Finland, 2005 In the northern and north-eastern part of the Perädpohja Schist Belt, northern Finland, an extensive supracrustal rock unit has been identified which is composed of alternating amphibolitic and arkositic components.
E. Hanski, H. Huhma, V. Perttunen
doaj +1 more source
Lithosphere, 2022 The Great Indian Proterozoic Fold Belt (GIPFOB) is a curviplanar highly-tectonized zone of Precambrian crystalline rocks. In the GIPFOB, the N/NNE-striking western arm (the Aravalli Delhi Fold Belt, ADFB) and the E-striking southern arm consisting of the
Anwesa Banerjee +4 more
doaj +1 more source
Structural evolution of the Vuotso area, Finnish Lapland [PDF]
Bulletin of the Geological Society of Finland, 2003 The Vuotso area is structurally interesting because the fold interference pattern in rocks of central Lapland changes into thrust-related foliation of the Lapland Granulite Belt.
M. Nironen, I. Mänttäri
doaj +1 more source