Evolution of the Bedrock of Finland: An Overview

Lahtinen, Raimo

doi:10.1007/978-3-642-25550-2_4

Cited by 2 publications

(1 citation statement)

References 37 publications

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“…The extension indicators were swarms of high-Mg mafic dikes and other intrusions as well as ensialic rifts aged 2.0 Ga with an ophiolite or ophiolite-like rock association (Stern, 2008). Examples include the Cape Smith belt, normal to the Trans-Hudson Orogen (Scott et al, 1999), and the N-S belt of the Reindeer Zone in the northwestern part of this orogen (Maxeiner et al, 2005) along with the Savo-Ladoga paleorift and similar structures of Finland (Lahtinen, 2012), etc. Deformations of these rifts and the formation of large thrusts and wide collisional zones such as the Kola-Belomorian-Lapland collisional zone were related to compression processes.…”

Section: Stage Of Paleoproterozoic Thermotectogenesis (27-17 Ga)mentioning

confidence: 98%

Extraterrestrial factors and their role in the Earth’s tectonic evolution in the Early Precambrian

Glukhovskii

Kuzmin

2015

Russian Geology and Geophysics

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The paper is focused on the fundamental problem of influence of extraterrestrial factors on the Earth's geologic and tectonic evolution. Extraterrestrial factors played a decisive role in the Earth's genesis, the formation of the first Hadean continental crust, and the beginning of the Archean era. Their significant influence persisted in the later epochs: Even in the Phanerozoic, extraterrestrial factors might have had a considerable influence on the environment. The sialic cores of protocontinental crust (4.4-3.9 Ga) with first-generation greenstone zones (3.8-3.2 Ga) and the global system of granite-greenstone belts (3.1-2.7 Ga) formed in the rotation-plume regime, mainly in the subequatorial hot belt. The formation of these global structures was, to a large extent, influenced by asteroid impacts, which caused the impact-triggered genesis of mantle plumes. Dramatic changes in the subsequent geologic history began at 2.7-2.0 Ga; at 2.0 Ga they terminated with the Moon's transition to an orbit similar to the present-day one (50 ± 3 Earth's radii), accompanied by the abrupt slowdown of the Earth's axial rotation, the termination of formation of the layer D″, and the start of recent plate tectonics, which is accompanied by the plume tectonics.

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Section: Stage Of Paleoproterozoic Thermotectogenesis (27-17 Ga)mentioning

confidence: 98%

Extraterrestrial factors and their role in the Earth’s tectonic evolution in the Early Precambrian

Glukhovskii

Kuzmin

2015

Russian Geology and Geophysics

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Constraining depositional models in the Barents Sea region using detrital zircon U–Pb data from Mesozoic sediments in Svalbard

Bue

Andresen

2013

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Detrital zircon U–Pb laser ablation inductively coupled plasma mass spectrometry age data on sandstones from Mesozoic successions on Svalbard are used to investigate provenance changes over time, constrain potential source areas, and to test and refine previous interpretations of the Mesozoic filling of the Barents Sea. The zircon age data indicate a western Laurentian (North Greenland) source in the Early and Middle Triassic. The westerly derived sediments most likely include reworked older sediments with proto-sources in Canada and Greenland. Sediments reaching Svalbard in the Late Triassic display a distinct Uralide signature that demonstrates derivation from the east. Zircon age populations in Late Triassic–Early Jurassic sands suggest mixing of zircons from the Early and Middle Triassic and Late Triassic sediments; the data are interpreted to reflect reworking of older Mesozoic sands and possible renewed input of sediments from the west. The data thus demonstrate a shift from westerly to easterly sediment sources in the early Late Triassic. The Early and Middle Triassic zircon age signature in this study appears to resurface in published Early Cretaceous provenance data from Svalbard, suggesting that sediment input from the east ceased during the Jurassic, and shifted back to westerly sources.Supplementary material:A summary of U–Pb isotopic results, Concordia diagrams of U–Pb age data, K–S test results and cumulative probability plots for all samples are available at www.geolsoc.org.uk/SUP18652.

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Evolution of the Bedrock of Finland: An Overview

Cited by 2 publications

References 37 publications

Extraterrestrial factors and their role in the Earth’s tectonic evolution in the Early Precambrian

Extraterrestrial factors and their role in the Earth’s tectonic evolution in the Early Precambrian

Constraining depositional models in the Barents Sea region using detrital zircon U–Pb data from Mesozoic sediments in Svalbard

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